i have a 91RS 305TBI. i plan on dropping in a 350 with Comp Cam and AFR heads. Now i want to be able to run 12's so could i do that with a performance TBI(if so which kinds) and if not what kind of TPI system would meet my requirments(prices would help).

 

i was thking of like a super RAm or mini RAM. any good? and isit worth the money?

 

Super ram is good, but the price is huge.

If you want 12's cheep get a carb

 

If ya got the money for the AFR heads, then ya might as well shell out for the Super Ram. That is a nice setup.

 

If you live in San Diego you can't have a mini ram, It's not emmisions legal. If you get a Super Ram and AFR's it will be one bad *** car.

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88 Formula 350 WS6
Upper and Lower SuperRam, 1000 CFM Accel Throttle Body, ZZ4 cam, 24# Motorsport Injectors, Larger Gutted Mass Sensor, Homemade Cold Air induction, Custom Burned PROM, MSD 6a box, MSD Distributor, Accel SuperCoil, Taylor 8mm wires, TB Bypass, B&M shift Kit, 160* Thermostat, Flowmaster Muffler

Headers in the mail soon to be installed

 

If was doing another performance buildup on a TBI f-body (already did one about 8 years ago) I would NOT switch to a TPI -- even though my current ride is TPI equiped.

Having owned both I think the TBI is more flexible once you know what makes them tick.

Good luck to you whatever you choose.

RP.



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'91 Formula Firebird G92,WS6,5-speed,3.42 a ton of fun to drive.

 

well then whats a good TBI? People have told me holley 670 and GM 454 TBI but i dont know which one or a manifold to go with. any one have some advise?

 

Hello,

The TPI and TBI discussion will go on forever.

TPI is expencive, but I'm happy with the results. I've built a million hot rods with carbs, and they've had mixed results. I've also spent so far, enough on my TPI setup to build two 12 second cars. But thats life.

IMO, TPI is better than TBI in GM's form.
GM TBI utilizes like 38-42 (or so) MM bores.
This is terrible for even a 305, understanding its a "wet" system.

TPI (stock) utilizes 48MM bores, which only air passes through, its a "dry" system.

TPI also uses tuned runners, which achieve
greater torque due to increased air speed entering cylenders, however stock runners after around 4700RPM die because the air cannot counter react off the cylenders.

TBI generally has a greater powerband because
of its lack of plenum and runner, its a direct feed system. But again, its a wet system that IMO is no better than a carb, aside from its obvious electronic functionality.

My truck utilizes a system much like some aftermarket FI setups - a throttle body bolted directly to the baseplate w/out runners, or plenum, and 8 injectors. Its still a dry system, but its not "tuned". It can have some RPM and power benefits available on carbs, and TBI, but also get hte benefit of increased air/fuel of a MPFI
type system.


I'm using SLP runners, ported plenum,
home-made throttle body, airfoil, 22lbs
injectors, adjustable regulator. I was running 13.5 with a stock intake (with
Edelbrock baseplate), so I think with above mentioned items I can get into high 12s, or 12.9 at least. n20 or a blower will futhur
enhance me later.

At the same time, a friend with a similar
motor but with carburation, pulls pretty
consistant low 12s. But his car runs like crap for normal street driving, idles like
a goat, etc.


-- Joe

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1989 Formula 350 4-bolt mains, Forged .030 TRW pistons, SLP 51010 Roller Cam, Comp-cams roller lifters,
Summit 1.5 roller rockers, World Products Sportsman II 2.02/1.60 heads, Edelbrock TPI Intake,
Cloyes Double Roller timing chain, Mellings oil pump: 13.5 @ 100.23 MPH

Since close of track : Ported SLP runners, Ported Plenum, AFPR, Autometer 100lbs F/P gauge, A/F ratio gauge, MSD 6AL.

http://www.joesperformance.com