70ls1chevelle

iTrader: (119)

Should this work good ????
GT-91
1475 (141lbs/min)
3RD-94mm
1.08 T6

On my 402LS in a 70 nova E85,10.7 compression,325 gear.28"tire,3500 stall
Will i have lag ?

LilJohn

Id rather see you in a full GT55 sized turbine at 112mm.

With the cubic inches and static compression you have, id be more worried about excessive backpressure than lag.

Cam72aro

iTrader: (28)

On my 408 in my car Dr. Turbo recommended the gt91 with the 94 turbine on a t6 with a .96ar housing. It spools really well at 12psi. I am on about 9.5:1 compression with l92 heads.

70ls1chevelle

iTrader: (119)

I have PRC L92 heads,spools really well at 12psi ? What do you mean,you can launch at 12 psi ? Would you think a 1.08 a.r sounds to high ?Im wanting to build this as fast as possible on the street,i have a low 9 second street car that works very well to outrun lol.

Cam72aro

iTrader: (28)

I run the car at 12psi currently. I havent really launched the car but can get a couple of psi on the 2 step. The 1.08 might do good with the higher compression in your motor. I know the .96 does great for me.

o2camaross

iTrader: (2)

Do yourself a favor and listen to Liljohn

70ls1chevelle

iTrader: (119)

--------------------------------------------------------------------------------

Id rather see you in a full GT55 sized turbine at 112mm.

What exactly do you mean,im new to this turbo language.What is a full GT55 ? And the turbine itself is 112mm ?
Nitrous is alot easier LOL

9sectruck

iTrader: (9)

I told you...... nos.... you have to beat me first before you get to the big boys here
this big mama jama
http://store.evans-tuning.com/garret...ing-turbo.html

hardbodeez

iTrader: (10)

What does this mean? It spools where at 12psi? 3000rpm? 4000rpm?

When do you hit 12psi?

TAHOE5.3

iTrader: (4)

I'm thinking he meant it spools up fast.

LilJohn

Ignore the word full if it confuses you.... i consider turbos like the gt88 and GT91's to be mini wanna be GT5518's...

Talk to dudeman.. he switched from a gt91 to an S500 that has the same wheel dimensions as the gT5518..

Hes a stock shortblock 6.0.... and your a 402 with damn near 11:1 compression on E85......

You are gonna need the 112mm turbine... trust me on that.

MIGHTYMOUSE

iTrader: (59)

you forgot to mention how much power you want to make or how fast you wanna go.

Cam72aro

iTrader: (28)

I hit 12 psi by 4000 or so. I am sure I could gain more with a bigger turbine, but in a street car I think I would lose spool time with a 112. Has there been a side by side comparison with this John? Does the billet wheel gt 55 help prevent this? Just curious.

9sectruck

iTrader: (9)

THE fastest street car here runs very low 9s if not 8s,
we both are gunning for that car. so in the 1k-1100 on the tire hp

LilJohn

Cam.. Ive proven time and time again that spool time has very little to do with the physical size of the turbine. Ask Ott308 what happened on his car when we went from the 83mm S400 to the 96mm S400. We swapped cam and turbo and his spooled quicker with the bigger turbine. Now, I will say its imperative that the cam timing be optimized for that to happen. I wouldnt cam a motor the same for a GT91 and a GT5518.

At the very least... id be looking at the GT5088 instead of the GT91... its got a 104mm turbine iirc.

We havent really done any back to backing with different sized turbines. Since Ive became involved in what Joses doing at FI all hes done is proof of concept dynos on all the new compressor wheels hes been bringing to market.

The billet wheels help im sure. On the new Billet 80 for the S400... that wheel is 50 grams lighter than the cast wheel... pretty drastic difference.

LilJohn

The new 94mm ETR 11 blade comp wheel in a GT55 put 1248 to the tire last week at 20 psi. Engine was a 390ci AES built LS.

Actually made 35 more rear wheel horsepower than the uber expensive garrett GTX5533 it was back to backed against. The only down side is that it was 150 rpm behind on the boost curve. Thing is.. without instrumentation like a datalogger or dyno... i doubt anybodys assometer could ever tell the difference.

1-2 grand cheaper and makes more power... Pretty damn good i think.

DrTurbo

iTrader: (3)

Yup, test went pretty good I believe.

Cam72aro

iTrader: (28)

Thanks for the reply John. I will have to look at the bigger turbine when I want to step up and make more power. The only thing I was worried about was spool time, but you cleared that up. When I outgrow the 91, I will get with you. Thanks again.

DrTurbo

iTrader: (3)

Our new ETR 88, 91 will be available soon. John will be testing them on some setups also.

9sectruck

iTrader: (9)

liljohn I can not believe the difference from one cam to the next on how fast the turbo comes to life on my lil 5.3.

Going to be getting ahold of you once this lil engine pops for my big engine cam specs