Going turbo

[LT1_Fireman]

Hey guys, whats up...So far up to date I have made 707 rwhp with a d1 but am turning over a new leaf and going turbo.The biggest reason is the headache the d1 has give me:frustrated: with belt slip,ect...and I like the idea of being able to control boost with the turn of a knob.My question is what size turbo should I go with? My goal is 800+ to the ground ,my comp ratio is 9.5-1,I have ported 190 trickflow heads also.Would a 76mm ever make the power I am wanting or should I go 88mm? Any advice is welcome ,Thanks.

[Grr]

Im guessing you want to stay with a mid frame turbo? If you go with the small one definately go with a precision 76 or 78GTS. If bigger go to forcedinductions.com and pick up a airwerks 80mm, whatever they suggest, sx80 i would bet. that will take you up to 1k or so.

[RealQuick]

Hey guys, whats up...So far up to date I have made 707 rwhp with a d1 but am turning over a new leaf and going turbo.The biggest reason is the headache the d1 has give me:frustrated: with belt slip,ect...and I like the idea of being able to control boost with the turn of a knob.My question is what size turbo should I go with? My goal is 800+ to the ground ,my comp ratio is 9.5-1,I have ported 190 trickflow heads also.Would a 76mm ever make the power I am wanting or should I go 88mm? Any advice is welcome ,Thanks.

We need more info on your setup. Who ported the heads? What cam you using? How many cubic inch?

[Fastbird]

Biggest question you have to figure out is what Flange. The 76 Is the biggest T4 flanged turbo I believe, then you have to step up to a T6 flange which also means a much larger turbo.

FWIW, I'm shooting for 800 to the ground with a PT76GTS and a LT1Boost 1 3/4 header hot part kit.

[Grr]

I just bought a pair of t-netics Y2K 81mms today....
dont think 800whp is out of the question now!

[Z28pr0jekt]

uh... twin 81s is a bit much don't you think?

800 can be made with a single 76

[dsmawd350]

hahaa where you plan on mounting them

[Grr]

i didnt say i was using them both on one car, i just got 2 of them. Now i gotta start ordering some pipe, going to make full cast stainless manifolds

[LT1_Fireman]

well it is a forged 355 with 9.5 comp ratio ,LE ported trickflow heads,Comp Cams Camshaft, 224 / 236, .536 / .554, 115LSA,LE ported lt1 intake...Thanks for the help guys

[RealQuick]

Alot depends on the design of the kit... but I don't see why a T76 won't support~800rwhp. Now if you want to go to 900rwhp+... go with a PT88.

[Grr]

Also wondering how you are coming on this. I would for sure suggest not using a 76 for your goals. I still suggest going with the FI SX80, it is rated for 1300hp, and is far more efficient than a PT88, along with a little better spoolup. The PT88 is really old technology, also if you are interested, the guy i bought my Y2k from has some Innovative 88mms off his pro mod car he is selling for $1k each. Said they make insane power.

[RealQuick]

Also wondering how you are coming on this. I would for sure suggest not using a 76 for your goals. I still suggest going with the FI SX80, it is rated for 1300hp, and is far more efficient than a PT88, along with a little better spoolup. The PT88 is really old technology, also if you are interested, the guy i bought my Y2k from has some Innovative 88mms off his pro mod car he is selling for $1k each. Said they make insane power.

800rwhp is not a problem for a T76 on a 355ci... especially a T76GTS. The turbo is plenty capable... it is a matter of the heads/cam combo he matches up with it.

I haven't seen results from the SX80 or ST series turbos... as far as being far more efficient... don't know about that until I see the results. What I do know is that the PT88 has been making 900+rwhp for many years, and still continues to.

Parish made ~1050rwhp @ 24psi thru a 4L80e in his truck with a 408ci and PT88

Supposedly one of Jose's customers made 102xrwhp @ 21-24psi with a PT88 and 355ci LT1.

Purevil (local guy here) made ~mid 800's rwhp @ 14psi and 93 octane with his 408ci LSX

Mightymouse was around 980rwhp I believe with his PT88 setup

Many a Ford 306-347 have made over 1000rwhp with PT88's.

I have built quite a few LT1 turbo kits, and what I know is that space is tight in the engine bay... and if you want to avoid a big T6 turbo (like a Y2k 88mm), then I would go with a PT88 without a doubt. Now, if you don't care about space and will stand the radiator up... I would just go with an S88 and make 800rwhp @ 12-15psi.

[Grr]

my point exactly, why push it that hard when a large frame can do it much more easily and reliably. I ran a 75mm S400 on my GN for 2 years, and pushed it to high 600s whp a few times, at around 16psi. Didnt want to take the stock motor any higher. If your looking to make that kind of power, making the turbo fit is a small part of it. That is partially why i went with a 80mm this time, I should be able to get about 650whp on pump gas and around 12psi, and 800whp up around 18psi, thanks to my new heads

[LT1_Fireman]

800rwhp is not a problem for a T76 on a 355ci... especially a T76GTS. The turbo is plenty capable... it is a matter of the heads/cam combo he matches up with it.

I haven't seen results from the SX80 or ST series turbos... as far as being far more efficient... don't know about that until I see the results. What I do know is that the PT88 has been making 900+rwhp for many years, and still continues to.

Parish made ~1050rwhp @ 24psi thru a 4L80e in his truck with a 408ci and PT88

Supposedly one of Jose's customers made 102xrwhp @ 21-24psi with a PT88 and 355ci LT1.

Purevil (local guy here) made ~mid 800's rwhp @ 14psi and 93 octane with his 408ci LSX

Mightymouse was around 980rwhp I believe with his PT88 setup

Many a Ford 306-347 have made over 1000rwhp with PT88's.

I have built quite a few LT1 turbo kits, and what I know is that space is tight in the engine bay... and if you want to avoid a big T6 turbo (like a Y2k 88mm), then I would go with a PT88 without a doubt. Now, if you don't care about space and will stand the radiator up... I would just go with an S88 and make 800rwhp @ 12-15psi.


Thanks for the info guys it helped a lot.

[Fastbird]

Problem with the ST series larger frame turbo's is space. There's just not a lot. It's the primary reason why I stuck with the 76, so I wouldn't have to do a TON of modifications under the nose of the car.

[dsmawd350]

heres how my GT42 mounts, thats on the previous car, mine will have a notched out radiator support for more room, i think with a few tweaks i could have room to go bigger.