TBI Mods.

[fernanbfg1]

BigTruckDriver,

Are you running this setup? How is it?

[GreenMonster93]

Originally Posted by edge464

well right now i just have open headers and the o2 sensor is close to the outside so maybe thats why is running like crap or do you think i need a custom chip cause of my mods? so you think i should go with 2 1/2in tubing

I bet your truck has no power anywhere... a 3" pipe to a single muffler to dual 2.75 tips will look cool and will flow plenty and still give u planty of back presure

[edge464]

i eneded up putting 2.5 true duals on

[kevinv]

94 blazer 350 TBI

Live at high elevation in Colorado.

I have a 454 TBI unit but have a hard time finding anyone who has made it work successfully.

The stock manifold ports are small anyway so not sure what good a bigger TBI would do unless I get a different manifold.

Is there anyone who could recommend a "working setup"... I guess I dont have the time or $$ to experiment ... I'd just like to get a little more air into the engine at this elevation and since I have the intake and heads off now... seems like a good time to look into it more.

Thanks!!

[PTcrazy]

hi, i have a 95 ec 5.7l, with k&n replacement filter,hypertech powercharger, xmtreme fi afpr@15psi and injector pod spacer, shaved tb, wide open tbi spacer, intake tube from a k1500 4.3l, msd blaster coil, acdelco spark plug 0.35, 3wire O2 sensor,magnaflow 1-2,vette servo and transgo separator plate, falken ziex st/z04 r15 31x10.5, stock pcm,,,and doing just 17.825@74 i already knew that the tbi wasn't fast, but i expected better time

what times are they doing approximately with this mods??


..waiting cheapy flowtech shorty headers, summit digital ignition,pulley and permacool fans

[GreaseDog]

you're far from stock, you need something other than a stock PCM.

[Savage Sierra]

My TBI powered truck runs low to mid 14's at over 92 mph and its a 5100 lb. extended cab.

[reborn91chevy]

What heads are you running on that combo?? That is a damn respectable timeslip!!

[PTcrazy]

this weekend i installed flowtech shorty headers, summit digital ignition with accel 8mm wires, and an underdrive pulley and i went from 17.82@74 to 17.61@75.66

[BigWheelinBubba]

Originally Posted by PTcrazy

this weekend i installed flowtech shorty headers, summit digital ignition with accel 8mm wires, and an underdrive pulley and i went from 17.82@74 to 17.61@75.66

What gears are you running?

[Savage Sierra]

Originally Posted by reborn91chevy

What heads are you running on that combo?? That is a damn respectable timeslip!!

Stock 193's with a 3 angle valve job. 17.50's on up is pretty typical for a 1988-1995 TBI truck; stock or with some bolt ons you might see a 17.20. The best I've run when I had the 350 engine and just some TBI mods & headers was a 16.98 @ 78.3 mph. The 95 from the factory was rated @ 210 hp and 300 ft/lbs. Even with mods your only at 250-265 hp and that ain't gonna push 5000 lbs faster than a 17+ 1/4 mile.

My 383 with accessories and mufflers is only rated @ 310 hp and 410 ft/lbs. and mid 14's is about as good as you'll get with those numbers.

[Savage Sierra]

This was my very best time slip before the 383 was installed and this was with TBI mods, headers, blaster coil, Ram air tube and K&N filter and a Jet stage 2 chip (which I have for sale right now for $55 shipped) It's listed in the for sale thread. It's for a 1995 w/auto trans. Before the chip I was running 17.78 @ 77 mph after the chip 17.20's; chip and headers, etc I ran this....

[Savage Sierra]

Originally Posted by PTcrazy

hi, i have a 95 ec 5.7l, with k&n replacement filter,hypertech powercharger, xmtreme fi afpr@15psi and injector pod spacer, shaved tb, wide open tbi spacer, intake tube from a k1500 4.3l, msd blaster coil, acdelco spark plug 0.35, 3wire O2 sensor,magnaflow 1-2,vette servo and transgo separator plate, falken ziex st/z04 r15 31x10.5, stock pcm,,,and doing just 17.825@74 i already knew that the tbi wasn't fast, but i expected better time

what times are they doing approximately with this mods??


..waiting cheapy flowtech shorty headers, summit digital ignition,pulley and permacool fans

I have a nice starter Chip that would help those mods. I had it on my 350 but now I have a 383 and it wont work for me any more. Its a Jet Stage 2 Performance Chip for 1995 GM trucks with a 350 and auto trans. They run about $160 from Jegs or Summit but I'll sell mine for $55 shipped to your door.

Its listed in the For Sale threads. It has a good description there. PM me if interested. Check out my post in this thread also. Click on the link below to goto the for sale ad for the Jet Chip.

http://www.fullsizechevy.com/forums/...eal-cheap.html

[PTcrazy]

i think its a 3.42 rear end.
Thats a very good offer, but i dont had a pobox for now.
But i'm ready to begin the installation of my perma cool fans this weekend, at least the wiring.
Anyone have pictures of electric fan with the metal mounting straps #104 in a OBS?

[305juan]

when i had my 305 tbi the best i got out of it was a 16.90 without any chips just bolt ons....then i put it in a 350 with a lt1 cam and im running 15.40 on motor.... i want to dip into the 14's but i still havnt decided what else im gonna put in...my tbi is not ported yet...

[Savage Sierra]

Originally Posted by 383beast

Has anyone had success replacing the Holley TPS with the factory one?? I have the 502-6

I did, bolted right on no problem. The GM is not adjustable though and the one on my Holley 502-9 is adjustable.

[PTcrazy]

Originally Posted by 305juan

when i had my 305 tbi the best i got out of it was a 16.90 without any chips just bolt ons....then i put it in a 350 with a lt1 cam and im running 15.40 on motor.... i want to dip into the 14's but i still havnt decided what else im gonna put in...my tbi is not ported yet...

thas a very good news
what length of a pushrod use for your lt1 cam swap????,did you change the valve springs, and distribuitor gear?

[Savage Sierra]

Originally Posted by PTcrazy

i think its a 3.42 rear end.
Thats a very good offer, but i dont had a pobox for now.
But i'm ready to begin the installation of my perma cool fans this weekend, at least the wiring.
Anyone have pictures of electric fan with the metal mounting straps #104 in a OBS?

I have 3.42 gears also and it doesn't make a difference!

[mjbell1]

Just replaced the throttle body with a CFM-Technologies
unit. Very pleased: no lights, idled fine from the get go.
Noticeable performance increase especially in the low end,
no early shift problems, pulled strong all the way to red
line 5200 with WOT.




"Blacky" 2005 Chevrolet Silverado V6 4.3L
MSD 6A Ignition, Coil, Cap/Rotor, 8.5mm Wires
K&N Cold Air Package, Cat-Back Dual Exhausts
CFM Tech. Ported/Polished Throttle Body
Thermostat 180

[tom ward]

well i guess my truck runs pretty good for all stock except for headers, posi, and 5 speed tranny, i ran 15.9 with it, then with 125 shot of nitrous i run 13.5 and i havn't ran it with the s/c yet. tracks around here are closed till spring