305 tbi questions

ok well im looking at a few 305 tbi camaros,1. is 135000 miles alot for a 305 tbi? 2. should i get a 305 tpi instead? 3. or should i get a 350 whatever? 4. can you get power out of the tbi? 5.does tpi get better gas mileage then tbi(how much better if it does)? 6. overall which engine is better (more reliable and faster)? :evillol:

thanks-Tom

also which has cheaper parts and more available performance parts?

tpi beats tbi in everything except maybe gas mileage.i think they get about the same

you can work with tbi, but you'll be kicking yourself for not getting the TPI instead, it's simply a better, more efficient system.

The 305 TBI is a dog, where as, excluding the TTA, 305 TPI is the 2nd fastest engine they offered in a third gen.

305 TPI (W/ A4) - 190 HP & 295 FT/LBS Torque

are there any advantages of changing a tbi 305 to a carbed 305 ? if so is it an easy and cheap change?

No, it won't have any advantages if that's all you do.

here's the deal, it's not TBI that's bad, it's the crappy swirl port heads that was put on all the TBI engines. If you were to swap heads that were from a 305 TPI then you'd be just as well off.

sorry, i fogot to mention the TPI 305's had a better cam, so you'd need that too.

305 with a holley 670cfm tbi, a LT1 cam, TPI heads, headers, edelbrock performer manifold, open element K&N, hi-flow cat, 3" cat-back, 3.42 gears, shift kit, all that and you'll have one hell of a street machine.

ok thats waht ill do, lemmme print that. the car already has 3 inch exhaust with flowmaster. but i guess i shall do the rest. well if i buy it.

ok thats waht ill do, lemmme print that. the car already has 3 inch exhaust with flowmaster. but i guess i shall do the rest. well if i buy it.
Wow gettin a new third gen....thats sweet. Youll love the 305, the 305 has potential if you know what to mod.

here's the deal, it's not TBI that's bad, it's the crappy swirl port heads that was put on all the TBI engines. If you were to swap heads that were from a 305 TPI then you'd be just as well off.

That's simply not true Geno.

The slight change in head design gave it about 5 more hp, and
only the 5 speed 305 TPI's came with the bigger cam.

The TPI can also give you slightly better mileage.

yep getting a new 3rd gen. i test drove one but it had too many little interior and exterior problems. plus when the new engine was put in he was too lazy to finish some small things. like he had extra parts hanging around in the engoine bay. so now im looking for a different third gen manual V8.

"faulk Chevro-gay" Punks

"faulk Chevro-gay" Punks

ummmm.... WTF? dont you have anything else better to do? you need to grow up pal

It's alright, he just feels bad because he has a very ugly car.

Understand his anger. He drives a putrid looking fox-body, which he was probably paid to take off someone's hands, so what's a guy gonna do?

damn someone has a peice of shit car and is a little jealous :banhim:

in 1991, the RS 305 TBI coupe was rated at 170hp while the Z28 305 TPI coupe was rated at 205, I think the head difference was a bit more than 5hp bag91.

in 1991, the RS 305 TBI coupe was rated at 170hp while the Z28 305 TPI coupe was rated at 205, I think the head difference was a bit more than 5hp bag91.

It's too stupid to argue, if you want to believe that a TBI and TPI injection systems produce the same power, well that's your choice, but having gone from TBI to TPI on my own car, I probably don't have a point of reference here, and the fact that I've felt a substantial difference without changing the heads, must mean I'm delusional.

can you show me where I said that they make the same power? cuz I can't recall where I did.

can you show me where I said that they make the same power? cuz I can't recall where I did.

"here's the deal, it's not TBI that's bad, it's the crappy swirl port heads that was put on all the TBI engines. If you were to swap heads that were from a 305 TPI then you'd be just as well off."

But before that you said, "you can work with tbi, but you'll be kicking yourself for not getting the TPI instead, it's simply a better, more efficient system."

It was just the former startment that I didn't get, but I don't remember reading the latter, so I'll just call myself stupid and go home.)

umm so should i get a 305 tbi or wait for another 305 tpi to come along????? or a 350. and i want this car to take my mods and be reliable. so umm how many miles is alot on the v8. cause ive been trying to find one under 100,000 or barely over.

in 1991, the RS 305 TBI coupe was rated at 170hp while the Z28 305 TPI coupe was rated at 205, I think the head difference was a bit more than 5hp bag91.

What are you talking about.....I didnt meantion head difference??????
I just said he'll like the 305........

umm so should i get a 305 tbi or wait for another 305 tpi to come along????? or a 350. and i want this car to take my mods and be reliable. so umm how many miles is alot on the v8. cause ive been trying to find one under 100,000 or barely over.
If it was my decision, id try to wait for a 350.
Buy a 305 if its exceptionally nice.
Thats what happened to me......in my opinion of course.... :iceslolan

sorry bag, that was a mistake, i shoulda put ct91rs's name there instead of yours.


and ct91rs, the reason i said he'd be kicking himself for not getting TPI over TBI is that there is a lot more aftermarket for it. and if it was so much more efficient, how come it was discontinued in 92 and TBI was used for years longer?

No prob

and ct91rs, the reason i said he'd be kicking himself for not getting TPI over TBI is that there is a lot more aftermarket for it. and if it was so much more efficient, how come it was discontinued in 92 and TBI was used for years longer?

Ok, here ya go. As I'm sure you are aware, in '93 they introduced the LT1 to the Camaro's. This engine had a superior injection system, MFI (multi-port injection), which was more efficient than the TPI (which also has an injector for every cylinder, but it batch fires), so they cut the TPI. None-the-less GM did keep the weaker (and cheaper) TBI system.



It's too stupid to argue, if you want to believe that a TBI and TPI injection systems produce the same power, well that's your choice

how much worse ongas is the 5.7 compared to the 5.0?

ok well looks like im getting a 305 if the 350 didnt ever come with a manual trans.how hard is it to put a manual in a auto 350? did they have different cranks and stuff?

ok well looks like im getting a 305 if the 350 didnt ever come with a manual trans.how hard is it to put a manual in a auto 350? did they have different cranks and stuff?


It would be easier to swap a 350 into the car with a 305 than to go from automatic to manual, but as has been discussed before, the T5 won't hold up to the 350 for long.

oh ok well im getting a 305 then. is there much of a market for tbi? cause its not too often theres a 305 tpi for sale.

oh ok well im getting a 305 then. is there much of a market for tbi? cause its not too often theres a 305 tpi for sale.

You'll have a hard time finding a 305 tpi with a 5 speed. They made a lot of 6 cyl. 5 speeds, but if you find a 305 tbi 5 speed you might want to settle for it.

oh ok well i have 2 that im gonnna look at so far that are 305 tbi 5 spds. the last car i test drove was a 305 tpi 5spd and the guy that owned it said it was a 5spd from a 2.8 with a new bellhousing. is that true? did they use the same 5 speed?

Dont know, but i have a 305 in my car and now im putting in a 350. so if i were you i would wait and just save more money while your waiting and find a camaro that already has a 350.Because right now im kickin myself in the ass because i just bought the first shiney camaro i saw, and i should have got exactly what i wanted. just my :twocents:

When I was looking for a new thirdgen it was very hard to find one with under 100000. Thats why I jumped on the one i found cuz it only had 84000. But there were a couple. There was a nice blue one out by lakeland that supposedly had about 76000. It was a 305 tpi iroc with a 5 speed i think....it sold for about 2500 if im not mistaken. So they do exist its just hard to find.

i would wait for a 350 but i really want a manual. i am kicking myself in my ass for getting an automatic.

305 and 350 is basically the same engine. T5 was used in all chevy cars. You can put a t5 into an auto car. need only slave cylinder, clutch pedal assembly, bellhousing and a couple holes drilled.
Manuals are nice. I would get the TBi car and just swap the TPI in it (easy). Look at RS cars from the 90's in nice cond and 305 TBI manual.

TPI are faster because of the large runners, the manifold design and 8 injectors instead of 1.(fuel distribution). TBI is a freaking carb with sensors to control it and a giant injector. The TPI engines are far more superior and a bit better on gas. $200 will get you evering that makes the engine run as a TPI setup. I can turn a carbed car into a TPI in 6 hours if no serious problems are encountered.
Parts needed: fuel pump (a whole in the trunk),manifold,runners,plenum,TB,comp and the right harness (some components will interchange from the TBI), set of gaskets, and a couple days of labor. You can use the same distributor and most of the sending units. Its nice to buy like that because you get lots parts at once.

ARGH!!!, theres nothing wrong with TBI!!! you can make plenty of power from them, you can run a carb manifold, with a adapter plate and a holley TB and make lots of power, i know tpi is better but dont knock the TBI!!!!

ARGH!!!, theres nothing wrong with TBI!!! you can make plenty of power from them, you can run a carb manifold, with a adapter plate and a holley TB and make lots of power, i know tpi is better but dont knock the TBI!!!!
I AGREE....
They didnt make manuals in the 350's?

I AGREE....
They didnt make manuals in the 350's?

no, all third gens with a 350 came with a 700R4(auto). With the fourth gen's they gave 350's the T56(manual), which is a 6 speed.

no, all third gens with a 350 came with a 700R4(auto). With the fourth gen's they gave 350's the T56(manual), which is a 6 speed.
Whose idea was that, their top performance car with an auto and the v6 with a manual?????
IT DOESNT MAKE SENSE

Whose idea was that, their top performance car with an auto and the v6 with a manual?????
IT DOESNT MAKE SENSE

They didn't put the T5 into the cars with 350's because that tranny wouldn't hold up to the 350 for long. The T56 is much stronger, so they were able to use it with the 350.

The T56 made its debut in '93, and thus was not available for the third gens.

Well TBIs are all right, but why not to go with the best right
from the start.
And the manifolds in TBI cars are crap, why not get the tpi one insted of drilling holes in those carb manifolds or spacers.
Manifold $200, plus say 2 spacers $80, and a perfomance injector $160, plus an intake $???$.= TPI How much hp and torque? About the same right? And no more room to ugrate.

TPI are faster because of the large runners, the manifold design and 8 injectors instead of 1.(fuel distribution). TBI is a freaking carb with sensors to control it and a giant injector. The TPI engines are far more superior and a bit better on gas. $200 will get you evering that makes the engine run as a TPI setup. I can turn a carbed car into a TPI in 6 hours if no serious problems are encountered.
Parts needed: fuel pump (a whole in the trunk),manifold,runners,plenum,TB,comp and the right harness (some components will interchange from the TBI), set of gaskets, and a couple days of labor. You can use the same distributor and most of the sending units. Its nice to buy like that because you get lots parts at once.
TBI's have 2 injectors not one and i get a little better gas milage with my 305tbi than my friends with 305 tpi's and i can beat them too.But if you have the chance to get tpi instead of tbi id go for it.

TBI's have 2 injectors not one and i get a little better gas milage with my 305tbi than my friends with 305 tpi's and i can beat them too.But if you have the chance to get tpi instead of tbi id go for it.
What mods on your TBI?

headers, plug wires, tbi spacer, open element with K&n, catback exaust, no cats, posi rearend with 3.42 gears. Thats all i can think of.right now im getting about 19-20 mpg but im keeping my lead foot light.