gymtitan

I have Ed Potter putting my car together in Decatur, IN and we went with a 408 and my OLd single turbo kit T76mm going with a 2 stage, eboost, line lok, RPM stage 5 Auto. The motor made 498 hp on dyno at 8.5 comp. Looking to get 750 rwhp street tune and more with race fuel and strip tune. I keep hearing that the 76mm will not do what I want but it is rated to 900-1000 hp?

What do you think? This is I was told the best forum with real racers so let me hear some info?

Looking for 9's

gymtitan

What size injectors would be recommended or do you use with a similar combo?

JZ 97 SS 1500

iTrader: (2)

A turbo should be rated with a BIG * beside the HP rating. The manufacture ratings are only vaild if all the conditions are met. Bascially its saying the turbo can make this XXXX hp if you have the XXXX combo. As for 750rwhp....it will depend on the turbo kit itself as well as the specifics of the turbo.

otherwhitemeat

iTrader: (3)

thats a small turbo for that motor

blown4now

What heads are you using? How well do they flow? I asked the same question about a month ago for my build, and I got a unanimous "T76 is too small" answer. After talking to some guys and looking at about 6 compressor maps side by side, a T76 would choke on my 402 and struggle to keep up with the flow. Talk to forceinductions.com about the S88 for your car. Is this going to be a street car or track car? If it's going to be a track car, I'd go S88 or bigger. Are you doing hydraulic or solid roller? What RPM do you plan to spin? All those things need to be answered first. My setup is a 402LSX with ETP LS7 heads, and a pure street car. Because of this I opted for a hydraulic roller setup, and dropped the S88 single for a pair of PT70GTS-HP Ball Bearing turbos. Quicker spool time for the street, don't have to spin high rpm to get the best out of them, etc. Answer those questions and you will have a better idea what you need to do, but to answer your general question, the T76 will not do that motor justice.

gymtitan

I am using Trick Flow heads and Hyd roller. This is a street car not going to run high Rpm's. The flow of the heads was great but specific numbers I do not have in front of me right now. Once we get it running this week the dyno will give us alot of info. So if we see the 76 does not hold up then a 88 will not be a big deal to order and for what I have spent so far not alot extra just for the Turbo compared to overall cost.

blown4now

Well with the 88 know that you might not be in boost till around 3500rpm. I think with a 408 you should make enough torque on the low end to spool that sucker up! Let me know how ya like it.

Darren P

iTrader: (1)

I am wanting to go with twin 67 or twin 70 t04 set up on my AFR head 403

onfire

iTrader: (17)

If it's a T4 I'll bet you'll be backpressure limited to 650ish rwhp.

I wouldn't try it myself If a larger turbo will fit....especially a T6.

DrTurbo

iTrader: (3)

Yup...I would go S88 ....FTW!!!

PurEvl

iTrader: (2)

my 408 pt88 hits 840+ on pump and does it insanley quick..dont bother with the 76

NA$TY-TA

iTrader: (21)

I agree...

ninetres

iTrader: (35)

Strange claim. I made 650rwhp on only 10psi with a 346. I understand it will be choking a bigger motor...and it might drop boost in higher RPMS, but it should make WAY more than 650hp.

I am almost through my 364 build-up and will be using the same T4 T76gts. I am boosting this bitch to the moon and plan on much more than 650rwhp.

Earl H

iTrader: (1)

Titan,

You are getting many of the same answers I got when I was looking at doing a 4XX motor with my T76gts...well, only then the S88 wasn't avail. In the end, I ended up going with a different motor combo and twins.

onfire

iTrader: (17)

Plot the air consumption of a 364 on a T76comp map.

Now plot a 408.

Now factor in a T4 turbine at ???Ar.

Now factor in a standard T76 on a GTS.

I had a T76 T4 once upon a time.....

DrTurbo

iTrader: (3)

Bingo....

http://www.forcedinductions.com/help.htm


You can use the maps there. Also plot them versus a 88.

ninetres

iTrader: (35)

From an untrained eye, looking at the map and consumption rates---It looks like the T76gts will be okay on a 364 to me. We shall see. The 408 will definitely be too much motor......but still will haul ***.

motorbuilt

iTrader: (17)

Unless that T76 was a S76...then I can picture you making 800-900rwhp

EATON22

You are smart to get all the numbers first. It is true that heads; turbo kit; piping size; bends; downpipe size and exhaust size all have to work with the Turbo . The less restriction the greater chance of maxing your HP. If tis is a street care primarily and a 408 I agree with those who say the T76 is to small and you will reach peak way to soon. There is a great small housing 88 that I believe would be great for the street. This little turbo on Buick Grand National 272 C. I v6 spools quick and makes close to 800 HP on pump gas. Maybe someone els will agree. Most of this depends on your goals for using the car. Good luck. I know you will enjoy that guy setting behind you that will be constantly pushing you in the back. Nothing like the linear accleration of a good turbo car.

ocdwill

tim go 88 ....just do it. better safe then sorry...the car will be bad eather way but more is better...