TBI Mods.

[95_Chevykid]

Originally Posted by BigWheelinBubba

Fuel pressure regulator.. i'm putting one on my truck in the next few weeks. From what i've read on this and other boards is that its one of the best mods out there.

ok, so where can i get a good one.. and i'm guessing i should get an ajustable one?

[taz104]

If you're interested in VAFPR, I'll sell you mine. I had to take it off to pass smog, here in Cali. I'm going to sell my truck, so no since in putting it back on.

Here's a link to the VAFPR setup.
http://www.top-downsolutions.com/Doc...vafpr%20tbi%22

I also have the check-valve and tubing needed, but I didn't purchase their spring....
http://www.top-downsolutions.com/index.php?cPath=23

And the regulator, if you look earlier in the thread...page 6, cost me $42+SH.

I'll sell everything for $50 shipped.

Read up on it and if you're interested, let me know. It will definitely give you the low end torque you're looking for.

I also have a Jet 6pack for sale in the classifieds. $200 shipped.

As far as the lid-flip trick, unless you are running a cowl induction hood, you are just going to be sucking hot air into your intake. Best to use the cheap vent mod and fernco clamps.
Here's mine.
Clamps:


And installed:

[moneypit]

Hey Taz104,
I have a '95 K1500. I installed a fuel pressure regulator last year. It has helped a bit, but not too much. My truck has a 305 and I am already at 15 psi... close to the stall speed of the stock TBI fuel pump. How is the VAFPR different from the type with the adjustment screw? Like CFM-tech and turbo city sell?
Just curious about the vacuum adjust, etc....

[taz104]

Vacuum-Adjusted. As you step on the gas, you create more vacuum, which will pump more fuel. It's great for power on-demand. It's used alot in marine applications.

Copied from the 3rd Gen.org site. (which is where I found most of my information, while researching it, btw...)
"A standard afpr is adjustable obviously, but will remain at that pressure no matter what rpm or load you're at (given the pump can handle it).
A vacuum referenced regulator uses a vacuum line to vary the fuel pressure. At idle, there is less pressure because of less vacuum. At wide open throttle, or any thing off idle, vacuum increases thus increasing the fuel pressure as well. For pure example only (figures are only to give an idea and do not represent actual values) fuel pressure would look like this with a vafpr:
idle at 700rpm: 9psi
1/4 throttle at 1,500rpm: 11psi
WOT at 4,000rpm: 15psi

A vafpr is good for high fuel pressure applications, as high pressures at idle can make for a poor idle."

Hope that helps!

[americanmetal07]

would it be possible to fit LS1 or LT1 heads on these blocks?
or do they have different bold patterns?

[yukon cornelius]

Originally Posted by americanmetal07

would it be possible to fit LS1 or LT1 heads on these blocks?
or do they have different bold patterns?

In short No.

LS1 no way ever. I have seen some LT1 heads welded up and modded to work but for the money it would cost you, just buy a set of aftermarket heads.

[indytruck]

For those who keep claiming that the lid flip is a good idea, it's not. A couple of weeks ago I was running my truck at the local dragstip, and the first couple of runs I had the lid flipped, later I deflipped it and their wasn't a sinle change in my time, I used to do it, but after that I threw that idea out the window on the drive home...

[bigredtrk1991]

It all depends on your modifications. If you can do anything with the extra air it's not going to help you. But if your air inlet become the main restriction to making more power, then it will make a difference.

All things considered, it's at most a few HP on a basically stock truck. You wouldn't see that at the track. On the other hand, a heavyly modified engine sucking through a small inlet, it will make a big diference. Think restrictor plate racing in NASCAR....

[rtenzo02]

This is all good opinions, and I would like to thank everyone that participates on this site, my opinion is cold air is better, the home depot tube seems to be a cool thing but for 40 bucks or close on ebay, u can get a nice polished intake. I also believe it's no diffrent then the K&N tubing that some spend well over 200 bucks for, the filter is the only diffrence if any, the size and design of the tubing is all the same to me, u just pay for the name. Please correct me if Im wrong !

[NoMO6]

Hello all I have a question on an engine swap. I am installing a 1987 suburban TBI 350 in a 1984 pick-up that had a straight six. The suburban has an auto trans but I want to keep my manual trans in the pick up. Do I have to reprogram the computer or is there a way to by pass that system. Thanks all and have a good one.

NoMo6

[gt89stang393]

Hello everyone, I own a 1994 Silverado K1500 Z71, I have a dynomax catback, magnaflow y-pipe with high flow cat, JBA shorty headers, K&N, cfm-tech throttle body spacer and injector spacer, the Hypertech powercharger, MSD coil and a FASTCHIP. The truck runs great when its warm. I wanted to say to everyone that this forum has been a world of help to me finding the issue I am having with my truck, cold starts give me a rough running, black smoke spewing POS. But thanks to all of you I know what the issue is now, and even though the vacuum FPR is discontinued by GM, I am trying to find another part for this application. Parts America claims to have them online and I ordered one, we'll see if they actually have one or not. Next up is an MSD. Does anybody know somewhere that would have the regulator I need if Parts America does not have it? I have been searching online and cannot find anything, called NAPA and they don't have anything compareable. Thank you in advance!!

Eric

[95chevy350]

Hey guys i have a 95 chevy cheyenne 350 5 speed manual tbi spacer shorty headers true duals flowmaster 40's but i want to put a cam in it can y'all help me out a little bit? i need lift duration and also prices would be helpful oh yeah and do i need to upgrade the chip?

[ccreddell]

Elsewhere on this forum I believe the advice was to use the lt1 cam.

[edge464]

what does everyone think of what im doing?, i bought a set of patriot 195cc aluminum heads and im considering on buying the edelbrock aluminum intake manifold, holley 670cfm throttle body, a voodoo cam .489 lift 1800-6200 rpm some harden pushrods and an Ostrich real time ECM emulator......tell me what you think,thanks

[gt89stang393]

Hello everyone, I found a cheaper alternative to the JET adjustable fuel pressure regulators, http://cgi.ebay.com/ebaymotors/NEW-G... Z260066183193 says you can make them vacuum referenced also. I ordered one and one of their ported throttle bodies, lets see how much of a difference it all makes!

[Roaddriver]

Hi everyone, I am new to the site and have so far found it very interesting and helpful. I have a 1994 c1500 Suburban with a 5.7 SBC with a 4L60E Trans behind it, with a 3.73 gear under the back end. It is also has a Gibson Cat Back exhaust.I took it on a 1600 mile trip right after buying the truck last year and my mpg was a dismal 13.23. Then on a trip to Kentucky in OCT of 05 I poped a deer on the interstate at 75+ MPH. So while putting the truck back together I did some upgrades.1. 442 style functional ram air hood
2. Volant cold air induction. MPG increased from 13.23 to 15.56 on the 550 mile return trip home.
3. 1 inch TBI spacer and injector pod spacer. MPG increased from 15.56 to 16.25 MPG. 4. Tied the Volant induction system into the Ram Air hood. MPG now at a much better 17.08 MPG avg. on a recent 2600 mile trip to Florida. With all the current mods the truck driver a heck of a lot better, much more responsive. Next up Heads, intake,and headers. Any suggestions on these.

[Fast305]

Originally Posted by Roaddriver

Hi everyone, I am new to the site and have so far found it very interesting and helpful. I have a 1994 c1500 Suburban with a 5.7 SBC with a 4L60E Trans behind it, with a 3.73 gear under the back end. It is also has a Gibson Cat Back exhaust.I took it on a 1600 mile trip right after buying the truck last year and my mpg was a dismal 13.23. Then on a trip to Kentucky in OCT of 05 I poped a deer on the interstate at 75+ MPH. So while putting the truck back together I did some upgrades.1. 442 style functional ram air hood
2. Volant cold air induction. MPG increased from 13.23 to 15.56 on the 550 mile return trip home.
3. 1 inch TBI spacer and injector pod spacer. MPG increased from 15.56 to 16.25 MPG. 4. Tied the Volant induction system into the Ram Air hood. MPG now at a much better 17.08 MPG avg. on a recent 2600 mile trip to Florida. With all the current mods the truck driver a heck of a lot better, much more responsive. Next up Heads, intake,and headers. Any suggestions on these.

Nice improvements

Keep the heads stock for now, if you are interested in keeping the current fuel mileage.

Get into DIY Prom Tuning. It doesn't cost much more than an off the shelf chip.

I picked up nearly 20 RWHP and 25 RWTQ by custom tuning a stock L05 350.

The stock intake is not that bad of a setup. It will support alot of HP, I put 279 RWHP down with my 350 on a Stock TBI intake and stock sized, ultimate TBI moded TBI.

I would upgrade the camshaft once you get into DIY Prom Tuning.

Add some 1.6:1 Roller Rockers onto your current engine as well as some new valve springs, replacing the valve stem seals at the same time.

1 3/4" x 3" headers will help tremendously when combined with a 2 1/2" dual exhaust system. Dual cats, X or H pipe, and low restriction mufflers.

[Roaddriver]

Originally Posted by Fast305

Nice improvements

Keep the heads stock for now, if you are interested in keeping the current fuel mileage.

Get into DIY Prom Tuning. It doesn't cost much more than an off the shelf chip.

I picked up nearly 20 RWHP and 25 RWTQ by custom tuning a stock L05 350.

The stock intake is not that bad of a setup. It will support alot of HP, I put 279 RWHP down with my 350 on a Stock TBI intake and stock sized, ultimate TBI moded TBI.

I would upgrade the camshaft once you get into DIY Prom Tuning.

Add some 1.6:1 Roller Rockers onto your current engine as well as some new valve springs, replacing the valve stem seals at the same time.

1 3/4" x 3" headers will help tremendously when combined with a 2 1/2" dual exhaust system. Dual cats, X or H pipe, and low restriction mufflers.

Thanks fast305, you input is a help, looking to put a set of eldebrock TES headers in the truck. Any feelings good or bad about them. Do you have an idea where I might find a ported set of L05 heads, from what I have been reading on the site these might be what I am looking for instead of trick flow heads. Also any ideas of a high flow cat replacement. I already have a Gibson cat back system on the truck so I will have to live with this system on the truck for some time.

[Silverback]

A lot of these trucks are setup for a 3" cat/intermediate pipe and basically a single exhaust. I have a magnaflow high flow cat and a Hooker aerochamber on mine, and am considering giving either the flowtech or summit bolt in shorties a try... of course, like I've said in other places, everything I plan on doign to my K1500 blazer is in the interest of torque and wringing out a little more MPG out of it, so I suspect the 1-1/2" primaries would be more appropriate for me then some of you.

[GoOnGreen12]

When i flipped my lip over i got much worse gas milage and when i fliped it back it felt like it had more pull. I think more much not too much airflow is right for tbi's because if you jam too much air into it the gas is not be sufficient. Just bought a TB spacer and Injector Spacer i believe those work... but flipping the lip from what i noticed got bad gas milage