Frost

iTrader: (45)

TSIA....

This is on a *** turbo kit... tubular manifold design. I want to get a broad consensus of where this P76GTS will be with engines in the 360-400" range. What would you do, and why. Thanks for reading.

-Steve W.

*edit*

-doh, left out stock-inch LS1, sorry.

mahhddgtp

For the street? 370ci. Spool time wouldn't be too bad.. Good bit of power.

smokinHawk

iTrader: (48)

a 346 should pair to that nicely, dont need to big of cubes with that turbo, its only a .96 AR T4 frame.

Frost

iTrader: (45)

Someone I trust told me the same, and that's probably the way I'll go... just wanted to hear some thoughts on what and why from you guys. Thanks for the input guys.

NA$TY-TA

iTrader: (21)

I say stock cubes also...... but if your thinking about going with a iron block then go with a 364 or 370 if ya want the .30 over pistons.

Kyle

DrTurbo

iTrader: (3)

I agree

bboyferal

iTrader: (9)

Stock cubes. It's what I'll be doing with the same turbo.

Spool, at its worst on our motors, will still let you merge on the onramp.

SUPER DAVES Z

iTrader: (6)

Yep, I'd go 346. FWIW a T-76GTS on my buddies cobra (283 ci) running the same manufactured turbo kit as you, had full boost by 3800-3900. And those motors don't flow near the numbers a H/C 346 will. It'll spool plenty fast and be capable of making nasty power up top without rediculous back pressure.

Later,
Dave

bboyferal

iTrader: (9)

Even Supra's (3.0L) run them without THAT much lag... Of course with a narrower powerband but still... It'll get the car moving.

Frost

iTrader: (45)

Yeah, my friend is an old pimp ... so I knew he had good advice, just wanted to get a complete consensus

GR33N GoblinM6

iTrader: (14)

GTS76 is a hell of a lot bigger than a GT76.. we use GTS76 on the 7.0 liter and bigger and We use the GT76 on 346ci and higher..

Garrett lists the GTS76 as having a 106mm compressor trim
GT76 has a 76mm compressor..

Frost

iTrader: (45)

It has 76 GTS scribed into it, should be able to see it on the compressor's output side in the first pic.

engineermike

Here's the deal. . . how much boost do you want to run? Will you be limited at ~15 psi due to pump gas??? That will determine what cid works best.

If you want max power on pump gas at low boost, then you won't be max'ing out the turbo. The more power you make NA the better it will do at low boost levels so bigger engines will do better.

If you plan on max'ing out the 76 at >20 psi on race gas or Meth, then the 346 will work best.

Sure, the Supra's have made over 1000 rwhp with the 76 and only 180 cid, but they do it at 30+ psi boost. If you're going to max out the turbo on race gas, then the cid isn't as critical but the smaller motors do have a better e/i pressure ratio resulting in slightly higher hp numbers

This weekend we are dyno'ing (engine dyno) a carb'd 377 SBC with a T-76. We plan to run 20+ psi on it to see just how much power it will support on that many cubes in an ideal situation.

bboyferal

iTrader: (9)

Very true concerning the race gas...

I guess it comes out to how many stops you want to pull out... Race gas beast? Or pump gas big cid-er, which might choke the turbo at the "race gas/HIGH boost" levels but run super sweet with maximum power for 93 octane?

I'm in the same dilemma here.

JZ 97 SS 1500

iTrader: (2)

eh?? A 76GTS or GTS76 is nothing more then a 76mm front side with a S-trim turbine on the exhaust (ala GT42). If you are using them as a single on a 7.0 L, then you have backpressure problems . Also, "FYI" you can't have a trim of over 100. The only thing that could be different is if the nomenclature being spoken here is two different things.

Jose

Frost

iTrader: (45)

Well, for some reasons that I'm not going into, it's going to be 402". I guess I'll focus on good power with pump gas.

Any further thoughts on this?

CHRISPY

If you are going 402 I would look for a T88 instead of the 76

What are your power goals with the car?

had20z

iTrader: (2)

just curious on a built 408 what turbo would yall suggest?

Frost

iTrader: (45)

The kit I have will need a new flange for an 88, bigger downpipe, bigger gate, and the ultimate evil at this point in my car's life... the AC-delete mod.


Well, living in reality, my goals must change going from stock-inch to this... The final setup will be 9.46:1 with lq9s (this is based on the following data and a formula told to me by an old timer, maybe it's wrong? 4" bore, 4" stroke, -14cc dish, .055" MLS compressed size, 72cc chambers). Making 700RW on meth, FMIC, and pump gas would be fantastic. Getting anything out of it over 6K so I don't have run a stupid tall gear that will break my drivetrain and be overly violent to launch would be great too.

engineermike

700 rwhp will not be a problem with that turbo, even on 408 cid. We just made 930 fwhp from 377 cid / T-76GTS and it wasn't even max'ed out yet. Boost was ~18 psi.

Getting it to go above 6000 may be a problem though. The 377 peaked at 4900 and held flat to 5900. That was with a 230/230 cam and Victor Jr. intake.

Mike