Running Carb on a TBI motor, Questions. [Archive] - FSC

JoshTheCanadian

01-14-2010, 08:31 PM

ok, so i'm sure many of you know i'm in the middle of building a 350

Now, i have been thinking the last couple days and trying to figure if i should go TBI or Carb.

Now, im not saying TBI is no good or anything, Its just the fact i could save myself a bunch of money by going carb, but im also worried about the following if i went carb

Pros with Carb:

-Have all Parts
-Dad/Uncle very knowledgeable at tuning a Carb

Cons of Carb:
-Hard to Start in Cold
-Fuel Economy (not terribly worried about this)

Pros of TBI:
-Fuel Economy
-Easy Starting

Cons of TBI:
-Cost of Tune
-Wont be able to run truck till it gets a tune
-need to build or purchase Adapter plate

I have been reading up on Mykks Build. and he has successfully ran Carb and a 4L60-E using the stock PCM, I was wondering if this is possible with TBI system? What's stopping me from taking my Holley 650 off the shelf and putting a TPS on it, using the HEI dizzy i have and running carb?

http://www.fullsizechevy.com/forums/general-discussion/tech-articles-two/384016-mykks-l31-vortec-350-f-i-carb-swap-tech.html

If anyone has attempted anything like this, please chime in.

*I do not want people telling me thing like "Go TBI, you just scared of wires", Truth is, i had all the intent to go TBI, but money is super tight and i have all this stuff lying around, so if i cold save myself $300-$500 Dollars, It would help me tons.

Also, the truck is not a Daily Driver, and will see some time at the track.

Thoughts?

lowriderbowtie

01-14-2010, 08:44 PM

JoshTheCanadian

01-14-2010, 08:47 PM

If you want...I could give you contact info for a guy in Kamloops that does custom tuning for the OBD1 computers. Im probly going to get him to tune mine when I put the engine back in it. he charges 325 for the tuning.

the thing that scared me away giong to a big carb'd 383 stroker in my truck was the 4L60E thing...

is he the guy who does Westers tunes? I think i know who your talking about.

Yea, im just your tossed up on this, i really dont know which way to go.

GreaseDog

01-14-2010, 08:49 PM

JoshTheCanadian

01-14-2010, 08:52 PM

Josh, keep it TBI.

you have another vehicle to drive, so save, beg, borrow, or steal the additional $.

the carb will not fuel the engine as efficiently under ALL conditions even half as good as the carb will, and the engine will be altogether more streetable with TBI. your combo isnt anywhere near wild enough that its going to be too crazy for tuning to work with TBI.
I know what your saying GD, its just something that sorta popped into my head, I realize my Build is pretty mild, its just the fact that if i keep TBI i have to buy a Dizzy, Adapter Plate, and a whole TBI unit Unfortunately, Plus a tune

Basically its just a "what if" as of right now

cancritter

01-14-2010, 09:28 PM

being in williams tuneing that puppy will be full time job and a step backwards if ya go carb...your best to stick with tbi

JoshTheCanadian

01-14-2010, 09:42 PM

being in williams tuneing that puppy will be full time job and a step backwards if ya go carb...your best to stick with tbi

to tell you the truth, im like 98% sure im sticking TBI.

GreaseDog

01-14-2010, 09:58 PM

we talked him into putting a V8 in it and regearing, we can talk him into TBI too. :lol:

seriously Josh stick with TBI, you'll be much happier with the end result.

cancritter

01-14-2010, 11:55 PM

only reason l say tbi is the hilly mountainous area your in...it would drive your carb batty and milage would suffer to...the tbi will adjust to those varibles quite easly

JoshTheCanadian

01-15-2010, 02:17 AM

we talked him into putting a V8 in it and regearing, we can talk him into TBI too. :lol:

seriously Josh stick with TBI, you'll be much happier with the end result.
:lol: I was more of a idea then a plan or anything, I think TBI is here to stay!, carb is too mych fooling around.
only reason l say tbi is the hilly mountainous area your in...it would drive your carb batty and milage would suffer to...the tbi will adjust to those varibles quite easlyyea I'm sticking TBI, I'm just hoping all goes well with the tune.

lowriderbowtie

01-15-2010, 06:39 PM

is he the guy who does Westers tunes? I think i know who your talking about.

Yeah thats him. sunoka custom tune

Justv610

01-19-2010, 10:55 AM

Goodluck with your tune from Westers. Ive had 3 chips, and thing still doesnt run right and sucks up way too much gas. Maybe you will have better results since you live closer and can prolly get a hands on tune. My mailorder tune still isnt right, and im disappointed. When I get the money, I am gonna buy a beater car, throw the truck back in the garage and do the carb swap and sell off the tbi stuff. Nobody around here tunes TBI, and the people I know can tune carbs very well.

Pre-StrokerC150

01-23-2010, 02:04 AM

I swapped from TBI to a carb about 5 months ago. I could never get the TBI tuned right, and I was doing my own tuning. I don't drive my truck very often, but let me tell you, when I put it to the floor, that thing moves now. I had a 454 TBI on my mild 350 with a VAFPR and did all of my tuning with the EBL and a wide band. I thought I was doing something wrong with the tune, so I then paid $500 to have it dyno tuned and it picked up a measly 6 hp and 3 ft lbs torque.

After about a hundred people that own race cars, mechanics, and in general people that know what the "F" they are talking about said to "rip that TBI $hit off of there and put a carb on", I finally did. The thing woke right up and still passes emissions (no visual around here).

I'll admit, it's definitely less refined than TBI. It fires right up every time ok, but you do have to let it warm up some. I haven't taken it to the mountains, but the "hills" around here are about 500ft (where I live), and I work at sea level without any problems.

If you have the stuff to make a carb work to get it going, do it. If you aren't happy later, give TBI a try when you get a few bucks.

Jameslleary

01-25-2010, 09:18 AM

Stay TBI, And be done with it. What are the specs on your engine rebuild? If you`r not putting a huge cam in, you may be able to run a stock 94 ecm with the BJLH bin. You may end up spending more money(than with staying TBI) if you went the carb route, just getting the setup to gel with the Electronic transmission. Its not impossible though, people ar running carbs on LSx engines, with the adaptor and manifold from edelbrock.

mikes99z71

01-27-2010, 08:13 PM

im on my 3rd or 4th chip now for my tbi 383 setup and it is still horrible, now im being told I need to buy equipment to do datalogging so tbi can be tuned right. Should have went carb in the first place now im spending more money and i still only get 6 mpg. carb setup will be finished next week, from now on rather than wait a week for new tune to arrive i just turn a pair of screws. carb is the way to go unfortunately its costing me twice as much to get there because i made the mistake of trying tbi first.

BigTruckDriver

01-27-2010, 09:23 PM

From what I read you should be able to get a quadrajet very close to the drivability as injected. Tuned correctly of course.

JoshTheCanadian

01-27-2010, 09:26 PM

From what I read you should be able to get a quadrajet very close to the drivability as injected. Tuned correctly of course.

if i where to do it i would use a Holley/Demon or a Holley Replacement Q-Jet i have.

Actually im HIGHLY considering this.

ryan_thompson87

01-27-2010, 09:30 PM

Definantly run TBI. Tons of power to be had just have to tune the sucker. If you need all the parts pick up a wrecked TBI truck and you will have everything. Could be had for a few hundred bucks.

cancritter

01-28-2010, 09:56 AM

lm thinking those with issues have other probs thier trying to fix with a chip...chips gona do nada if your engines arent set up properly and l belive thats the issue here
as for data logging you need proper info to set up a tune and it will tell you if you have issues as well...a tunner is going on the assumption your engine ect is all up to par when he gives you a chip...
lota folks running on bad fuel settings ect ect bad egrs or some other issue and then you folks blame it on chip...its kinda like a doctor trying to do a diagnosis over the phone...
if tune is done properly there will be no issues...some folks here think a chip will fix thier issues that they dont wana address..bad timeing\bad fuel preasures ect ect...
both my Westers tunes run great because my engines were up to par to begin with
as for changeing to carb go for it if thats what you want...dont say we didna warn you

Pre-StrokerC150

01-28-2010, 10:29 AM

That's a possiblility for others, but not me. I have a new crate engine with a computer friendly cam. I started by having mail order chips, but none worked worth a damn. Then I got into tuning (then I could see why the chips weren't working for me). Bought a wideband, the EBL, ended up replacing every single sensor (they were old anyway), upgraded the TBI to BBC, upgraded the injectors (matched), switched to a VAFPR, bought a new GM distributor, bought different headers and exhaust, had a nice cold air intake, did compression tests, power balance tests, etc, and nothing worked as good as just bolting on a carb. I've probably spent more in chasing power on TBI that I did on the entire engine initially.

I have a dyno slip to prove what it did, and then they tuned the chip and I got 6 hp for about $500. The only thing I did was bolt on a carb and it picked up noticeably. I don't have the dyno slips to prove it since I'm putting together a 406 now and I see no need to waste the money.

Keep in mind that the truck didn't run bad, it just didn't have the power I wanted. It idled smooth, had good throttle response, etc. I'd say it runs a tad worse now because the carb doesn't adjust for winter fuel, cold weather or elevation like a TBI system does and the throttle response isn't quite what it was on TBI. Since I really only drive it in the Summer and I don't drive it much, a carb is exactly what I needed to accomplish my power goals.

If I would have put the carb on in the first place, I probably wouldn't have started the 406 project. Since the block was at the machine shop already, there's no turning back.

Swims350

01-28-2010, 11:07 AM

man a carb isn't hard to start in cold weather, we don't even use a choke here and they start fine. You just gotta push the peal a few times then keep tapping on the pedal for a few and it's fine.

I would like to do a carb swap on my 8tbi but I'm using a th350 which is easier then the electric trans controls. I just don't have the coin for new intake carb and bypass press. reg. to let the unused gas back into the tank. I did consider a mech. pump I think my block is made for it not sure though. I doubt yours is, so are going electric pump or what?

Stroked385

01-28-2010, 11:35 AM

To the guys who went carbed , what did you have to change ?

Thanks, Im considering it myself..

Pre-StrokerC150

01-28-2010, 12:53 PM

You need carb, intake manifold, distributor, fuel regulator, and gaskets.

Seems everyone knows that the right way to run the fuel is with a bypass regulator, but I know of someone who doesn't use one with a pump going on 13 years without a problem.

BigTruckDriver

01-28-2010, 01:07 PM

My opinion dont stone me. I think keep the TBI if its a daily driver with stock or a little more power. But a carb my do you a lot cheaper if you plan on going off road, racing,or just using in a play vehicle. It can be done with a tbi ,sure it can , but it will probably do better and definitely cheaper with a carb off road.

JoshTheCanadian

01-28-2010, 01:15 PM

BigTruckDriver

01-28-2010, 01:24 PM

Check this site for the Quadrajet. A lot of people dont like the quad but remember it was the shiznit for street ability and "heavy duty" use with fuel economy in mind. So , its not all that bad.http://www.smicarburetor.com/faqs

94_c/1500

01-29-2010, 12:57 PM

JoshTheCanadian

01-29-2010, 01:06 PM

I'm also thinking of ditching TBI when I rebuild my truck. I hate efi, but I wanted to give it a chance. That seems stupid, so I think a carb is in order.

I'm undecided of which one to go with, but it will be a Holley with a mechanical choke. I'm also thinking of a Wilson spacer and a DUI distributor.

why Mecahical choke?

If i do it its gonna be a Holley/Demon Electric Choke, Vacuum Secondary

or rebuild one of the 10 Q-Jets my dad has.

94_c/1500

01-29-2010, 01:55 PM

I don't need an electric. I have one on my Scrambler, it does start very easy, but it isn't really needed. My J10 has a mechanical choke, and it still started easy after sitting for 6 months, and it was 10 degree weather.
I am going to go with a vacuum secondaries.
My problem is I don't know what size to run with a V6. I was thinking a 450 cfm , but Holley only sells that for boats. I think a 390 cfm is too small and 570 cfm is too big. They have a 465 cfm, but it dosn't work with GM automatics.

94_c/1500

01-29-2010, 02:15 PM

Maybe I'll go with a 525cfm Road Demon.

JoshTheCanadian

01-29-2010, 02:24 PM

Maybe I'll go with a 525cfm Road Demon.

too big IMHO, I have heard that Demons flow more then there rated for.

What do you mean they dont work with gm automatics? you do realize when you go carb'd you either have to get a electronic controller or a Full manual valve body or shift kit.

94383Z71

01-29-2010, 02:27 PM

im on my 3rd or 4th chip now for my tbi 383 setup and it is still horrible, now im being told I need to buy equipment to do datalogging so tbi can be tuned right.

that's my issue. it's one thing to have a 350 or a 5.3 and such, which can be mail tuned not so hard. when you build a motor it gets alot harder (yes, I know OBD1 have CID provisions). I'm going to do datalogging for my tuning help. just need to, and its not hard.

Honestly, if you have it in person tuned and still have issues, you need a new tuner or new parts

94_c/1500

01-29-2010, 02:27 PM

too big IMHO, I have heard that Demons flow more then there rated for.

What do you mean they dont work with gm automatics? you do realize when you go carb'd you either have to get a electronic controller or a Full manual valve body or shift kit.

Not trying to be a smart a$$, then how did cars before efi have automatics?

JoshTheCanadian

01-29-2010, 02:30 PM

Not trying to be a smart a$$, then how did cars before efi have automatics?

they didn't have 4L60-E's like you do.

94_c/1500

01-29-2010, 02:31 PM

they didn't have 4L60-E's like you do.

That might be getting tossed. It will stay if I go with a manual valve body.

94_c/1500

01-29-2010, 02:31 PM

http://www.holley.com/0-1848-1.asp

It also has a hot air choke, which I don't want.

JoshTheCanadian

01-29-2010, 02:41 PM

That might be getting tossed. It will stay if I go with a manual valve body.

in favor of what?

SimpleGreen

01-29-2010, 02:47 PM

My truck is converted to carb. Its alright. Hates cold weather and is picky since its a cheaper Holley 600. Gas mileage is so-so. Buddy keeps telling me to buy a nicer $450 carb to get it running really good...but when I can buy a good running 5.3L with the harness, PCM, and 4L60E still attached for $1500 (if you know where to look) then it makes fooling with the carb less appealing. Maybe I'm just spoiled by my '05 now.

94_c/1500

01-29-2010, 02:50 PM

in favor of what?

700r4

JoshTheCanadian

01-29-2010, 03:08 PM

700r4

wont stand up to your 400HP V6. :read:

SimpleGreen

01-29-2010, 03:11 PM

wont stand up to your 400HP V6. :read:

You can build up a trans...:think:

JoshTheCanadian

01-29-2010, 03:12 PM

You can build up a trans...:think:

i was joking...

SimpleGreen

01-29-2010, 03:12 PM

i was joking...

Sarcasm does not carry over the interweb :crazy:

94_c/1500

01-29-2010, 03:35 PM

SimpleGreen

01-29-2010, 03:40 PM

If I keep the 4l60E, I will go with a reverse manual valvebody. A transbrake would be nice, but a bit overkill for my truck.

If I were to keep the 4L60E, can I just get a manual valvebody and remove all of the electrical stuff?

Pretty much. A manual valve body takes away all computer control. Aside from the speedometer sensor everything else is extra weight :D

94_c/1500

01-29-2010, 03:48 PM

Pretty much. A manual valve body takes away all computer control. Aside from the speedometer sensor everything else is extra weight :D

Guess I'm going to buy a manual valve body.

I'd like to get a TH350 for less weight, but I want to have an overdrive. I'm not taking weight reduction that serious anyways.

SimpleGreen

01-29-2010, 04:01 PM

Guess I'm going to buy a manual valve body.

I'd like to get a TH350 for less weight, but I want to have an overdrive. I'm not taking weight reduction that serious anyways.

I'm hopefully moving to an O/D trans soon myself...and throwing out all that BS related to AC and heat...:D

94_c/1500

01-29-2010, 04:06 PM

I'm hopefully moving to an O/D trans soon myself...and throwing out all that BS related to AC and heat...:D

I'm waiting for my AC to stop working first. I don't use it, but I don't want to remove it if it still works. My heater is staying.

SimpleGreen

01-29-2010, 04:07 PM

I'm waiting for my AC to stop working first. I don't use it, but I don't want to remove it if it still works. My heater is staying.

lol. Im going under the dash, taking the box out and all. There wont even be holes left in the firewall by the time Im done.

94_c/1500

01-29-2010, 04:12 PM

lol. Im going under the dash, taking the box out and all. There wont even be holes left in the firewall by the time Im done.

I'm thinking of a fiberglass hood, possibly fiberglass fenders but I don't know if I have the patience.

Stroked385

01-29-2010, 04:33 PM

94_c/1500

01-29-2010, 04:42 PM

SimpleGreen

01-29-2010, 05:22 PM

Just make sure you don't mess up the adjustment on the downshift cable. If it gets out of wack you'll tear up the transmission in no time.

JoshTheCanadian

01-29-2010, 08:39 PM

Guess I'm going to buy a manual valve body.

I'd like to get a TH350 for less weight, but I want to have an overdrive. I'm not taking weight reduction that serious anyways.

or you can get a TransGo 4L60E-3 kit.

94383Z71

01-29-2010, 08:41 PM

You'll REALLY notice the difference in the hood. I did. I wouldnt mind fenders, box and a gate.

Maybe not on a DD though, but a project truck yes

94_c/1500

01-30-2010, 07:31 AM

You'll REALLY notice the difference in the hood. I did. I wouldnt mind fenders, box and a gate.

Maybe not on a DD though, but a project truck yes

I'm going to have 2 dailly drivers. I wouldn't want a fiberglass bed. I'd like to keep the weight on the back. I've got fiberglass fenders on my Jeep and I like them.

I couldn't find much information on the Transgo 4L60E-3 kit.
I'd rather have a reverse valve body.

94_c/1500

01-30-2010, 07:48 AM

http://www.performancetransparts.com/index.asp?PageAction=VIEWPROD&ProdID=67

Vacuum controlled line pressure?

This might be what I end up going with, but it might kinda hard to shift fast on the column without it being a reverse setup.

94383Z71

01-30-2010, 09:26 AM

I'm going to have 2 dailly drivers. I wouldn't want a fiberglass bed. I'd like to keep the weight on the back. I've got fiberglass fenders on my Jeep and I like them.

I couldn't find much information on the Transgo 4L60E-3 kit.
I'd rather have a reverse valve body.

there's still plenty of weight in the back. you ever have your bed off? definitely weight loss to be had, trust me

94_c/1500

01-30-2010, 11:27 AM

there's still plenty of weight in the back. you ever have your bed off? definitely weight loss to be had, trust me

This truck will still be used as a truck, so the fiberglass bed and tailgate might get busted.

http://www.performancedistributors.com/minivipss.htm
Has anyone had any experience with this yet? I'm going to use their distributor anyways, but I'm not sure if its worth $250.

Has anyone used these?
http://www.summitracing.com/parts/EDL-9265/

http://www.summitracing.com/parts/HLY-108-51/

94383Z71

01-30-2010, 12:03 PM

I hear they're really really sturdy. I know fiberglass is. but like I said, I'd only go all out like that on a project truck

JoshTheCanadian

01-30-2010, 12:32 PM

I'm going to have 2 dailly drivers. I wouldn't want a fiberglass bed. I'd like to keep the weight on the back. I've got fiberglass fenders on my Jeep and I like them.

I couldn't find much information on the Transgo 4L60E-3 kit.
I'd rather have a reverse valve body.

Its uses vacuum, gets rid of all the electronics, makes it FULL manual, you have upshift and downshift.

JoshTheCanadian

01-30-2010, 12:33 PM

This truck will still be used as a truck, so the fiberglass bed and tailgate might get busted.

http://www.performancedistributors.com/minivipss.htm
Has anyone had any experience with this yet? I'm going to use their distributor anyways, but I'm not sure if its worth $250.

Has anyone used these?
http://www.summitracing.com/parts/EDL-9265/

http://www.summitracing.com/parts/HLY-108-51/

you can get a dizzy off ebay for like $80 its all you need :lol:

94_c/1500

01-30-2010, 12:36 PM

you can get a dizzy off ebay for like $80 its all you need :lol:

I wouldn't trust a distributor off of ebay. I'm for sure using a DUI distributor. I'm buying one for my J10 first to see how I like it. I guess I'll try a VIP with it first also.

94_c/1500

01-30-2010, 12:45 PM

Its uses vacuum, gets rid of all the electronics, makes it FULL manual, you have upshift and downshift.

Does it make it semi automatic?

JoshTheCanadian

01-30-2010, 12:50 PM

Does it make it semi automatic?

:think:

All i know is if you have it in 3rd and you stop at a stop sign, you take off in 3rd, and so on, its like a manual without a clutch.

94_c/1500

01-30-2010, 01:20 PM

:think:

All i know is if you have it in 3rd and you stop at a stop sign, you take off in 3rd, and so on, its like a manual without a clutch.

I read on a forum somewhere that its a semiautomatic. Its manually shifted unless put into overdrive. Then it acts like an automatic valvebody.

Either way, I will buy one of these. It will save me from having to buy a transmission.

JoshTheCanadian

01-30-2010, 01:22 PM

I read on a forum somewhere that its a semiautomatic. Its manually shifted unless put into overdrive. Then it acts like an automatic valvebody.

Either way, I will buy one of these. It will save me from having to buy a transmission.

everywhere i have read says if you put it in 4th your gonna start off in 4th, I think yout thinking of the Stage 2 kit.

94_c/1500

01-30-2010, 01:27 PM

everywhere i have read says if you put it in 4th your gonna start off in 4th, I think yout thinking of the Stage 2 kit.

What stall do you think I should run? Do you know what the stock stall is?

JoshTheCanadian

01-30-2010, 01:27 PM

What stall do you think I should run? Do you know what the stock stall is?

i have heard that the V6 stall is in the 2000-2200 RPM area.

Just keep that, im using mine behind my 350.

94_c/1500

01-30-2010, 01:31 PM

i have heard that the V6 stall is in the 2000-2200 RPM area.

Just keep that, im using mine behind my 350.

I can't remember exactly, but a converter behind a smaller motor stalls at a different speed behind a bigger motor? I remember hearing of people running Vega torque converters behind small blocks because of this.

JoshTheCanadian

01-30-2010, 01:36 PM

I can't remember exactly, but a converter behind a smaller motor stalls at a different speed behind a bigger motor? I remember hearing of people running Vega torque converters behind small blocks because of this.

sorta, A smaller motor will have a Higher stall TC, then if you put a bigger motor in front of it, it will stall higher then that motors original TC.

94_c/1500

01-30-2010, 01:49 PM

Since it will still be a dailly driver, I guess I will just keep the stock converter.

94_c/1500

02-01-2010, 12:11 AM

Isn't the locking and unlocking of the converter done electrically?

94383Z71

02-01-2010, 06:35 PM

Isn't the locking and unlocking of the converter done electrically?

I believe so, considering I can lock/unlock mine via a switch

94_c/1500

02-01-2010, 06:37 PM

I believe so, considering I can lock/unlock mine via a switch

How would I go about doing away with the electric oart of it?

94_c/1500

02-01-2010, 06:37 PM

I believe so, considering I can lock/unlock mine via a switch

How would I go about doing away with the electric part of it?

94_c/1500

02-01-2010, 06:37 PM

I believe so, considering I can lock/unlock mine via a switch

How would I go about doing away with the electric part of it?

94383Z71

02-01-2010, 06:40 PM

How would I go about doing away with the electric part of it?

and keep the 60E? Couldnt tell ya man.

JoshTheCanadian

02-01-2010, 08:37 PM

How would I go about doing away with the electric part of it?

with the kit mentioned :read:

94_c/1500

02-01-2010, 08:37 PM

with the kit mentioned :read:

I didn't know that took care of the torque converter also.

JoshTheCanadian

02-01-2010, 08:45 PM

I didn't know that took care of the torque converter also.

its suppose to, it says its for use with a 4L60E with no electronics.

Jameslleary

02-01-2010, 11:21 PM

Ok so fill me in here...This is something i have been seriously considering doing. How do i get rid of all the electric crap on my motor if i go carbed ?

A new HEI dizzy right ? and what about the trans, its a 1990 so would it have the 700r4 and would it need anything done to it ?

Sorry for the jack , but im looking for straight forward info. You would have to get a lockup kit installed on the outside of the O/D servo, but other than that, and a bypass regulator to bring your fuel pressure down to around 7psi, you got it. You guys with the 60e, Call Don at Transmission center in Bosier City, LA, and he will be able to tell you exactly what you need.

Stroked385

02-02-2010, 11:08 AM

You would have to get a lockup kit installed on the outside of the O/D servo, but other than that, and a bypass regulator to bring your fuel pressure down to around 7psi, you got it. You guys with the 60e, Call Don at Transmission center in Bosier City, LA, and he will be able to tell you exactly what you need.

Thank you very much.

Do you happen to have a link to this lock up kit , or should i just go see the guy at the local tranny shop

94_c/1500

02-02-2010, 01:35 PM

I found the carb I will be using. I guess Holley makes a 470 CFM. They just hide it by offering it only in the Truck Avenger series. I might convert it a manual choke.

http://holley.com/0-90470.asp

Jameslleary

02-02-2010, 03:06 PM

Thank you very much.

Do you happen to have a link to this lock up kit , or should i just go see the guy at the local tranny shop The guy at the local tranny shop should know what it is. The kit is just a pressure switch tapped into the cover of the O/D servo, on the Pass. side of the trans with a pipe thread, and opens the circut to lock the converter up in O/D. one wire comes in from key(via the brake switch) power, and the out wire goes to the red lock up wire that comes from the 4 wire connector on the trans.

canadianstroker

02-02-2010, 08:06 PM

is he the guy who does Westers tunes? I think i know who your talking about.

Yea, im just your tossed up on this, i really dont know which way to go.

LOL you guys $325 is nothing in the real Hot Rodding world....If you want to make HP it cost money $$ !!

JoshTheCanadian

02-03-2010, 05:00 PM

LOL you guys $325 is nothing in the real Hot Rodding world....If you want to make HP it cost money $$ !!

oh i know, :lol:

just i just got laid off and have no cash flow.

94_c/1500

02-03-2010, 05:04 PM

oh i know, :lol:

just i just got laid off and have no cash flow.

I currently have almost no cash flow either. Luckily it piled up before it stopped.

94_c/1500

02-03-2010, 05:05 PM

Can the factory tach be hooked up to an HEI?

rgv95

02-03-2010, 05:17 PM

go carb bro u need intake,carb,eliminate computer,diff fuel pump runs alot better than t.b.i trust me

94383Z71

02-03-2010, 05:53 PM

LOL you guys $325 is nothing in the real Hot Rodding world....If you want to make HP it cost money $$ !!

doesn't make it any cheaper. I dont know about you, but $325 aint on my list of cheap prices

go carb bro u need intake,carb,eliminate computer,diff fuel pump runs alot better than t.b.i trust me

did you even read the thread? thats not even up for debate now

Jameslleary

02-04-2010, 09:28 AM

Can the factory tach be hooked up to an HEI?Yes, Just find the factory tach wire(I dont remember what color it is) and install it where the HEI cap says TACH(next to the red). It runs off the neg. side of the coil power.You will have to crimp a female blade connector on the wire to plug it in.

94_c/1500

02-04-2010, 12:50 PM

Yes, Just find the factory tach wire(I dont remember what color it is) and install it where the HEI cap says TACH(next to the red). It runs off the neg. side of the coil power.You will have to crimp a female blade connector on the wire to plug it in.

Thanks. I wasn't sure if the factory tach can still be used. I already know how to wire a tach to HEI.

JoshTheCanadian

02-04-2010, 05:10 PM

Thanks. I wasn't sure if the factory tach can still be used. I already know how to wire a tach to HEI.

are you putting in a Carb V6 or V8?

94_c/1500

02-04-2010, 05:40 PM

are you putting in a Carb V6 or V8?

I'm keeping the V6.

JoshTheCanadian

02-04-2010, 05:44 PM

I'm keeping the V6.

ok cause when you go V8 your factory tach wont work.

94_c/1500

02-04-2010, 05:48 PM

ok cause when you go V8 your factory tach wont work.

I just wish it went past 5,000 RPM and 85 mph. It dosn't really see 5,000 but it will when I'm done with it. But I really don't need a tach anyways, and a GPS will tell me how fast I'm going. The speedometer is only right at about 80 mph anyways.

JoshTheCanadian

02-04-2010, 05:51 PM

I just wish it went past 5,000 RPM and 85 mph. It dosn't really see 5,000 but it will when I'm done with it. But I really don't need a tach anyways, and a GPS will tell me how fast I'm going. The speedometer is only right at about 80 mph anyways.

they make aftermarket tachs...

94_c/1500

02-04-2010, 05:52 PM

they make aftermarket tachs...

I want it to look factory. If I didn't already have a tach, I might get an aftermarket one.

ryan_thompson87

02-04-2010, 11:06 PM

Why the F would you carb a V6?

JoshTheCanadian

02-04-2010, 11:08 PM

Why the F would you carb a V6?

my thoughts exactley.

Cause you know, a TBI unit cant support his Custom made headers and his Dynomat wrapped aircleaner. :read:

ryan_thompson87

02-04-2010, 11:10 PM

Whoa whoa whoa. Whoa. :lol: I never knew of all those performance mods. No wonder.

JoshTheCanadian

02-04-2010, 11:10 PM

Whoa whoa whoa. Whoa. :lol: I never knew of all those performance mods. No wonder.

:lol:

kkustomz

02-04-2010, 11:28 PM

Jameslleary

02-05-2010, 09:56 AM

I saw tonight that holley makes a carb with a tps sensor for the 4l60e and 4l80e transmissions. What else would have to be done to run the carb with a electonic tranny as in the computer? What would the ignition do? I would rather have a carb over a tbi anyday.

Thanks
The ignition would do just fine if you go with a Vac advance Dist.....Otherwise, you will need a piggyback computer to keep the stock ecm from saying "WTF?" when it tries to control fuel parameters, and that may jack up ignition timing control( If you use your EFI dist) as well.
Does anyone know if the 80 and 60 trans us some sort of MAP reading to coincide with the TPS and VSS for control?
May be a good idea to call edelbrock Tech line and ask some questions!

kkustomz

02-05-2010, 10:12 AM

Doesnt the ignition also send a pulse to the ecm for the tranny? My truck has no map sensor and has a 4l80e.

Jameslleary

02-05-2010, 10:20 AM

Doesnt the ignition also send a pulse to the ecm for the tranny? My truck has no map sensor and has a 4l80e.
I don`t think the ignition would have anything to do with the trans...just signals cam position for spark and fuel control, but the pulses from the VSS definately help control shifting.

What year is your truck?

Ed Jean converted his 94 burb to TPI, but left his TBI ECM in the truck to control the trans, and used a Firebird ecm to control the TPI....I think all he did was splice in the VSS and TPS to send signals to both ecms, and maybe the MAP sensor too. You can contact him at EdgesZ28.com

Jameslleary

02-05-2010, 10:43 AM

actually, get the TPS kit from holly, install this: http://www.jegs.com/i/TCI/890/377502/10002/-1?CT=999
and roll on down the road!:D

94383Z71

02-05-2010, 12:54 PM

Whoa whoa whoa. Whoa. :lol: I never knew of all those performance mods. No wonder.

:lol: :lol: :lol:

94_c/1500

02-05-2010, 01:51 PM

Why the F would you carb a V6?

Because keeping the TBI is going to be a pain in the a$$.

kkustomz

02-05-2010, 02:33 PM

Jameslleary

02-05-2010, 02:48 PM

I talked to howell efi today and they said the tranny uses a tps and map reading for shifting. Does that mean we could just keep the map plugged into a vacum port, hook the tps, install a hei and go down the road? He also said i would still need a new chip for my 7427 ecm?
He`s correct. The Map is used to determine the engine load.....Map+TPS+VSS=what gear the trans will be in.
The new chip would be to program out the stuff you don`t need....will keep the ECM from going into "limp home" mode.

I think the TCI kit, with the Holly TPS kit would be the way to go, then just shelf your TBI stuff, or sell it......would also keep you from having to send off and wait for a reprogrammed prom to come back.