im lookin for a 91 or 92 rs or a z28 i would like a Z28, but i know most v8 rs's have 305 tbi, and a z28 305 is tpi. is a tpi better than a tbi and if i get a v6 will it be tpi?

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goin on 16 and i want a 3rd gen!
~cars~
1991 camaro z28
(will be mine soon hopfully)
1967 mustang gt fastback
(mine&dads)
1968 Shelby cobra gt500kr
(dads)
goto 4 pics
my_cars

 

V6 is MPFI... similar sytem, jusr designed to operate in a different manner. TPI is mad to "tune" the intake to a certain RPM range where as the MPFI intake is designed to perform well over a wide range of RPMs.
You wont find many Z28's with TBI if there even are any

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89 Trans Am Turbo 3.8L All stock 43,000 miles #1053 of 1555

Past Thirdgen:
86 Trans Am w/ built 355TPI with SLP goodies and too much other stuff to List. One sweet *** car, wish I would have had a good enough Job to pay insurance on three cars so I could keep it, but for a 89 Turbo Trans Am w/ Low miles, I think I made the right choice!

 

Tou really don't want TBI any ways. It uses 1 - 2 injectors at the throtle body instead of having an injector for each piston. Which is more eficient. The computer has better control over how much fuel gets delivered to each chamber. As with TBI you are at the whim of air flow dynamics. Some chambers may receive more fuel the others. This causes an unblanced engine due to a random load of each chamber. They used TBI becuae it was a cheaper setup.

If you go for a MPFI or TPI setup you'll want to pick up a spare set of injectors at the junk yard and have them sent to some like Cruzzin performance to be cleaned and matched. They coast about $6.00 a pop at the scrap yard, and coast to clean and matche is $10 - $15 dollars per injector. You'll end up with nice clean and matched injectors for less then the coast of a single brand new injector.

 

Aww yes here we go witht eh TBI bashing from someone who obviously has no clue about it.
Yes TBI got a bad name from the start because of the engine that it was mated to by GM. It cam equiped with lawnmower heads, a cam with misquito buites for lobes and a ****t rear gear to motivate the car. Couple this to a 305 and it speels a winner.
OK lets look at the good side of TBI. IT is the KISS (Keep It Simple Stupid)form of fuel injection, true TPI may be able top be tuned better, but 5 or 10 hp is not worth the extra $500 to do it. Which brings me to my next point, TBI is almost as cheap as having a carbed car. Almost any intake can bolt to it and larger Throttle bodies and injectors are not that expensive. Also its not as sensitive to other mods such as cam swaps.
Believe me there has been a lot of work done to make intake manifolds that provide even flow to all cylinders.
BAsically having a TBI car will allow you to do alot of stuff cheaper than a TPI car will and it will be faster to start off with than a V6 woould be.
Also they are easier to work on and tune.

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89 Trans Am Turbo 3.8L All stock 43,000 miles #1053 of 1555

Past Thirdgen:
86 Trans Am w/ built 355TPI with SLP goodies and too much other stuff to List. One sweet *** car, wish I would have had a good enough Job to pay insurance on three cars so I could keep it, but for a 89 Turbo Trans Am w/ Low miles, I think I made the right choice!

 

well, if you're going with a late model camaro, the 3.1L will be MPFI like has been already expressed, the Z28 could have a TPI 305 or 350, remember 350's didn't come in TBI like the 305 did. A RS 305 will be TBI, i'm not 100% on the horsepower numbers but a TBI305 made something like 170-180hp, the TPI305's were 215 hp cars and the 350 was a 235hp car. The beauty of Tuned Port Injection was that it maximizes engine Torque although doesn't provide much more HP, the reason that although HP increases about 20, torque increases near 50 or so...Your greatest advantage over a 305TBI vs a v6MPFI is the torque that the v8 will produce. 180lb/ft with the six and the eight will give you around 250 or so...which is a great difference, and enough to get you off the line faster. As far as being faster, it's nearly a toss up, depends on how well the engines are in running condition. the difference will be there, but not to noticable, being that most TBI's run high 16's and v6's run low 17's. The better part of the TBI would be that it will respond better to modifications that a v6 will. So, all in all it's a toss up. Just get whichever car you like better or can afford. If you find a Z with a 350TPI i wouldn't pass that one up, a Z with 305TPI i would go for also, a Z with TBI i would kinda pass up (they do exist, i've seen TBI irocs also) just because you could get a RS in the same condition cheaper, and a 3.1L i'd get if the body looked really really good, but not without that. the only bad part of getting a v6 instead of the eight, is that you've gotta change lots of stuff out if you want to change the car to a v8. If you're not satisified with a TBI RS, you could always pull the motor, ditch teh computer, and run the car with any v8 you want, to satifiy your emotions. That's the way i look at it...good luck.

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the 85 firebird, the first firebird that doesn't burn out....

It eats the pavement!!!

Nicole (my car):
2.8L bored .040 over
rebuilt 700R-4 w/shift kit and vette servo
3" I-pipe, with Flowmaster 80 series
2.5in. tailpipes into split tips (quad-pipes )
Loud Yes, Fast no. but a Turbo will fix that.

KILL LIST: (SHORT BUT GROWING)

Dodge Daytona (think a 2.2),Honda Acorda (2.0L),2000 Camaro (3.8L),1992 Mustang (V6),1987 Firebird (2.8L),80's probe (4 banin'),90's malibu,90's 4 door Saturn, (wow, that was a slow ride, even slower than me.),91 Celica GT conv.,Acura Integra, 5speed DOHC 4 cylinder. * 86-90 Pontiac T/A, 305ci. (might not have been running well, but i'll count it anyway.), mid 90's Ford Mustang GT 4.6L tags. (beat him in a turning contest), 3rd gen RS camaro( beat him by more than 2 cars), Celica GT (this guy was a crazy racer), 2000 honda civic (stickers, paint, new from facia, guages, no cat, with straight pipe, ... was a very good race, oh did i mention he had a 5 spd.
---came close----
1979 camaro (5.7),1981 camaro (5.7),1982 firebird (5.0) my tires spun, I coulda beat em!!! ,79 El Camino (350, lost by a door),96' Mustang, 3.8L stickshift. (caught him after my car downshifted.)

 

thanks for the info,but if i found a z wit a 350 i wouldent buy it. b/c i want t tops and 350's didnt come wit t's
so it sounds like ill go wit the 305 tbi or tpi

------------------
goin on 16 and i want a 3rd gen!
~cars~
1991 camaro z28
(will be mine soon hopfully)
1967 mustang gt fastback
(mine&dads)
1968 Shelby cobra gt500kr
(dads)
goto 4 pics
my_cars

 

There ARE some Formula 350's out there with T-tops...dunno about the Z28's though. :shrug:



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-Dan
-1990 3.1L RS
-Mods? no
-Slow? yes
-*Slowly* collecting parts for T5 swap

 

i wanna say that some later model Z's and Formula's did recieve the T-tops and that's because they redesigned them to be stronger and not pop out due to the high ammounts of torque...lol, that'd be awesome. Anyway, if you're looking for an equalizer think TPI305 with a 5spd. will turn times just as fast as a 350TPI, not to shabby huh.

 

Actually you got it backwards it was after 90 that you could not get a 350 T-top. The older ones were the ones that had them.
Oh yea that thing about the T-tops is bull, when was the last time you saw a T-top fly out of a camaro? I mean the LS1s have T-tops

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89 Trans Am Turbo 3.8L All stock 43,000 miles #1053 of 1555

Past Thirdgen:
86 Trans Am w/ built 355TPI with SLP goodies and too much other stuff to List. One sweet *** car, wish I would have had a good enough Job to pay insurance on three cars so I could keep it, but for a 89 Turbo Trans Am w/ Low miles, I think I made the right choice!

 

remember that the new LS1 models had some redeisngned T-tops, that arent the same as the ones found in the 3rd gens. It was said that back in the day, that t-tops on 3rd gens couldn't support "monsterous" ammounts of Torque, and itd be enough to rattle them out of the car. The apparently had thickened it up, on several years of camaro firebirds, but i'm not sure which years....