i just recently got back into street cars , i bought a 92 RS, after driving the car for a few weeks the 305 has about as much power as a good 4 cylinder .

My question is can i just drop in a 383 or a 350 say with a set of dart heads and a mild cam and make it run on the TBI without much troulble. I drive this car every day and i really like fuel injection. i hate carberators they are old school and i dont want to go backwards. however i do know that a carb will run great and is easy.

if the TBI wont work with the above what would be a good combo to go with to keep and get some decent power out of the car ???? thanks



Chad

 

well,u could do that and if u put the TBI back on your shooting yourself in the foot.

if u have a big budget and wanna stay w/ FI,i think Holley makes a good TBI system that u could look into that would give u great power. the GM TBI system is great as far as being reliable,but the performance is just not there.

 

A 350/383 will drop right in, that's what I'm doing. TBI will be reliable but like Rice Killer said, performance will be mediocre. If I were you, I'd look for a TPI setup. If you want to stay with TBI, look at the Holley 670. Look over the TBI board at www.thirdgen.org they have a lot of good info. Good luck!

-Corey

 

You can go with a 350 and those heads and a mild cam like the ZZ4, and have about 250 horsepower with a GM TBI setup. Dont forget you'll need larger injectors too, and possibly a custom chip. Dont expect the TBI make much more power than that.

 

TBI is the worst intake design ever, I don't know what they were thinking when they were trying to mate a fuel injection with a carburator. Defiantley get rid of the TBI if your getting a newer and bigger engine.

The LT1 swap is pretty easy if you wanna go that route, wiring is just about the only hard part. If not im sure you can find an L98 with a TPI setup pretty cheap these days, best of luck to ya.

 

dont forget you may have to change the fuel pump,

the decision i would make would be based on my budget, how much work i could do myself, and how long of the fooleshness i could stand before the car is drivable

 

Actually, if he had a v8 fuel pump it needs no replacement unless he was swapping in an LS1, but you could always do it if you feel your fuel pump is about to go out.

 

Wrong. The TBI fuel pump is only capable of putting out around 16-18psi and most any other injection setup (TPI, LT1, LS1, aftermarket) will require fuel pressure to be anywhere from 40-60psi. There is no "V6" or "V8" pump....the difference comes with the injection system. Hell the 2.8v6 fuel pump would be better for an injection swap than a TBI pump (the 2.8MPI pump makes about 48psi.)


There's nothing wrong with running a TBI system....you just have to build it right. Bigger injectors and an injector spacer (for more airflow) will help a lot, but if you want to run real power (i.e. 300+ hp) you'll need to go to a bigger throttlebody (or dual throttlebodies if you're ambitious) which is gonna require custom chip tuning at the very least.


I'd say go carbed. That's the route I took when I yanked my 305 and I've been very pleased with it. The carb is a little tempersome when it's below freezing, but it was by far the easiest way to go and the carb has been more reliable for me than any TPI car I've worked with.


My $.02

 

to give you all little background on myself i am a ASE master auto tech so all the work will be done myself !!! but on the other hand the reason i'am asking you all for advice is that i'am not much in the performance end of stuff.

So from what i gathered from you all if i want to make over 300hp i'am fixin to spend some jack to get the tbi to work?
Or i can get a motor out of a later model car that has sequential fuel injection?

So what is the best motor any of you all have under a stock tbi with only bigger injectors and a plate ??

I dont want this car to have 500 hp i just want a daily driver that doesnt get passed a dang rustang or a *** car.... etc.



Chad

 

To get TPI to work it won't cost much. To get a 300+hp TBI system, you'll need to spend a good bit of money.

An LT1 will swap in fairly easily. 275hp stock.

LS1 will swap in easily as well, just not as easily. Look at www.ThirdGenResource.com they have an entire swap kit. Bone stock they put down 320+. You will however need a new tranny, whether it be an A4 or M6 to bolt to an LS1 block. This is a whole 'nother thread though.

-Corey

 

mmmmmmmmmmmmm Carb

 

carberator's suck for daily drivers!!!!!!


Chad

 

Why not choose the 350 TPI set-up??Then maybe a holley stealth ram setup, heads, cam. This is also probably one of the best set-ups if you're working on a budjet.


Im with you on the carbs though, not a good choice for daily driver.

Whatever you decided to do, we wants pics!


Tim89Rs

 

Well, for a good daily driver and decent power and saving some money. I would just get a 350 longblock and a Holley TBI intake + Holley 670cfm throttle body + 1"under TBI spacer + decent cam + a custom Prom.
Plus all of the usual : Cold Air Inlet, K&N filter Element, headers, good exhaust, shift improver kit, decent gears.

I've got a 350 TBI in my 5,600 LB. Suburban, I'll tell ya, that thing suprises a lot of people!...It dies off around 75mph but it's stock except a 3" exhaust and a K&N element with the lid flipped over. I can sqwall both tires on a hard take off, and if the roads are just a little damp it'll Roast'em....I know it's not a rocket..but it's basically stock & weighs over 5,600 LB!!!
That motor in my Z would "Flat-out-GET-IT!...

But it depends on how far you want to go?, how much you want to spend? and the long term goals for the car...
Daily driver/decent power= TBI can do it. Weekend Warrior= TPI or LT1...

 

I hope you are not talking about swapping over the stock 5.0L TBI heads to the new motor. Those have to be amoung the worst if not THE WORST set of heads ever placed on a SBC. Invest in a set od darts, or anything else for that matter

Will