Need some advice
 

well it's the winter time. time to build something for next year..
now i have a 1991 firebird TPI 350, th700r trans, stock gears

now that i wanted to do was Twin turbo it. making 400-500 HP
now i was thinking of getting a 383 block off summit racing and using that as my base. i dont know what heads to use so many to pick, but the biggest problem I'm having is the transmission i can't find a good trans shop or someone to give me some advice on to either upgrade my trans or buy new and then the rear-end. if anyone has any advice or knows a shop plzz tell me

as for the body, suspension and brakes i have all that taken care of

Best advice I can give if you are serious about making that kind of power is to spend your money from the back to the front. Lay out a budget and start with a new rear (12 bolt / 9" / S60 / Dana 44 all will work), then your supporting suspension, then a driveshaft and trans, then the engine.

Talk to SSP and JS Performance about beefing up your trans, I believe either shop can take care of that for you. Whiplash is also able to hook you up with a new trans from Performabuilt. You can also talk to Josh @ JS about building a 383 for you to complement your plans for the car.

- Justin

sweet yea im super serious i saved up all like 12000 just for this so it's getting done i rented a garage got all the tools tape book everything lol the snapon guy loves me lol mmm a ford 9 sound nice a Dana i hear is hard to work on ooo a 12 bolt mmm so many things to pick ... oo and tuning who does that ?

s60 or dana
turbo 400 trans
set of cheap obx 1 3/4" headers, flip em, cut flanges off & weld vband flanges on it
buy & fab rest of your turbo parts
for a 383 twin 60-1's will work real nice
as for 383 you want a 9:1-9.5:1 cr
the TFS heads f'n rock on a sbc, I have seen them w/a mean cam make 500hp w/out power adder.

if going turbo hope you have a tpi setup that you can switch over to speed density or invest in a dfi or eldebrock efi setup.

good luck with build !!!

ok i like this now in your personal opinion should i buy a 383, bore out the 350 or build the 350 already in the car with 120miles on it one owner I know i need to rebuild the whole motor in order to take the stress. and a other question the motor i have now has a MAF on it do can it be form an 88-90 3gen and wouldn't that be better then the speed density

why turbo??? you can build a newer motor to handle plenty of power without wasting time on gen 1 garbage. hell even al went lsx :lol:

You are better off going with SD with a 2 bar MAP sensor over the MAF for a turbo setup.

- Justin

Steve's Transmission Repair, 904 Fredon Road Stillwater, NJ 07875 - (973) 579-2055. He only works on High Performance applications.

"i wanted to do was Twin turbo it. making 400-500 HP" - if that is all you make with twin turbo you're doing it wrong. That can be done NA.

IMO going twin turbo you are not buying an off the shelf crate.

What are your goals for the car? Drag racing? Showing? AutoX-road course? Doe sit need to be emissions legal?

a single turbo on a low to moderate psi will make your power no problem.

you'd also spend half the budget on the motor, trans, wiring, exhaust and not have a turbo. you are also pretty funny called a gen 1 garbage.

Yeah, because there are no fast SBC powered cars out there.

:stupid:

As I stated before, He can make 500 N/A But he wants to do a twin turbo,
wether or not its just the fact of having it +1 for coolness factor,but +2 for easily bumping the h.p. when he gets bored of 500hp!!!

500hp very easy w/twin turbo setup @ low boost settings, the BIG + for this is since he has a low #goal, will not need huge injectors or have to run meth injection.

OKay NOW..... Back to the OP.383ci very cheap these days to do. Look into a forged setup ie:
Eagle forged crank,Rods, pistons etc.. (these will put you to about 750hp limit)
machine shop can easily do the work for you with your stock block.

Cam: you can go with realitivly high lift cam, just make sure the duration is close along w/ lift ie: 208/212 .491"/498" (not suggesting this cam, just comparison for the split of #'s your looking for!!!)

F.I.:tpi setup ok, you will need to run a 2 bar map, run it car in speed density (some yrs. were in speed density, not sure what yrs. early lt1 z28s I believe)
60lb. motron injectors
twin walbro 255's intank (modify bucket to fit)

Turbos: 60-1 (t60's or t61's will work great)t3/t4 housing
for very quik spool order with a .63 a/r exhaust housing
for good spool with broad boost/rpm range use .84 a/r exhaust housing

dual 38mm wastegates will do ya just fine

headers/piping: 1 3/4" primaries, 2 "- 2 1/2" hot side to turbo, 2 3/4"- 3" out from turbo exhaust housing merged to single 3 1/2"- 4" to muffler

intercooler: 3" thick 2.5"inlet/outlets all cold side 2.5" then to 3"+ right before throttle body.

All this here will get you 500hp in a heartbeat !!! just crank the boost up to 10-15 lbs and you'll be 750+
good luck w/ build.

p.s. my dream when I was 17 was to have the first twin turbo Z in South Jerzy, Now its finalyy getting done, I just won't be the First !!! :-x(but I might be the fastest:mrgreen:)

Indeed, but TPI with twin turbos = ridiculous amounts of torque, which is tons of fun. I was in Andris Skulte's TT IROC years ago, and that car was just insane, even with the stock TPI intake. His site is just a shell of what it used to be, but here's some info about it - http://www.skulte.com/turbo.html .

emissions hahah no
well it was going to be my hot rod so to speak because in my family everyone has one so it's my turn now
i know I'm not doing anything different or new it just i want this and like SLEEPER said its the coolness of seeing TT once you pop the hood and i can get more HP with the push of a button

yea i'm seeing that now but i see it as this if i have to save a other 8000 for the turbo setup i want then so be it i will have a built 383 or 350 ready for TT

N/A TPI is not the way for any sort of horsepower, but when pressurized you can make great power with a TPI setup. Why spend 1/2 his budget to convert to an LSx setup when he can meet (or far exceed) his goals with the setup he already has?

- Justin

What I want to know is how many 500 hp TPI powered SBC members are on here? I for one can say for a fact that I have not met anyone on here and aside from track cars I dont think I have ever met anyone. I have met a buch of 3rd gen owners who have modified cars but none making 500hp or with TT's. Is there a reason for that?

If the motor has a limit of 750hp then why would you want to make 750+hp?

You're right. I make over 500 hp NA... :D

actually eagle rates their forged pieces at 1000 flywheel hp. maybe him saying about 750hp limit meant it could be above 750hp and making 750+ on higher boost meant only a little more?

Like I said I have never met anyone so I guess you would be a 1st. Would love to see some dyno numbers of your car..

Me to. I just have timeslips. :shrug: Last time I was there (about a year ago) I had fuel/ignition problems and put 394 to the wheels.

Actually it depends on what Rod and Crank you get! They range from 500-1200hp depending on the style and amount of money you want to spend..


Thats very cool. Hope you got that Fuel and Ignition issue taken care of. Is it a stealth ram setup?

Oh they have been taken care of. 30lb SVO's weren't enough. So I bought 42lb'ers. Ign was the crappy stock ing mod that comes in the MSD billet dist's. Replaced that with a stock GM one I had kickin around. All was good after that.

Yep it is a stealth ram.

a standard weight 4340 3.75" eagle crank is actually rated at 1500 hp, sorry.

do you actively search for 500hp 3rd gens with tpi intakes and a couple snails? i sure don't

You stated that all Eagle forged parts are rated to 1000 hp.
http://www.eaglerod.com/index.php?op...d=33&Itemid=40

No I dont actively search for 500hp TPI 3rd gens. I just mentioned that I dont really know of any and just wonderred if there is a reason behind it?