The 25g has a 60,5 mm comp. wheel and a 58 mm turbine wheel. Very small turbine housing.

 

Close, but not quite . The 60.5mm is the inducer diameter. The exducer, major diameter is 78mm. The turbine wheel is a 61mm. A TD05 turbine wheel is 58mm.

The turbine housings come in a 8cm^2 which is a good size for 2.0l and a 10cm^2 which is good for strokers. The problem is with the small exducer which can't remove the gas and causes excessive manifold pressure.

As for spool up, it is probably going to be roughly in between a GT3076 and a GT35R w/ a 8cm^2. With 10cm^2 it will be closer to a GT35R.

 

OK wait, 28PSI and you only got 500 WHP? Lets just say that it was an EXTREMELY SAFE AND RICH tune, you could duplicate these exact numbers with a GT3076R or a 50 Trim with about 1000RPMS of spoolup returned and of course more usable torque. This turbo should make atleast 600WHP on a Dynojet and 28PSI tuned properly.


Then again you may also be on a stock bottom end and taking it easy too, but a turbo like this should be able to hammer out atleast 450WHP on 93 Pump, the 3076R can hit 435 and the 50 trim about the same PSI no less.

The GT35R outspools this thing. It is a full BB unit I have seen 30 PSI on a GT35R by 4600RPMS in third, that is not bad, this turbo is past 5000 in third. There also seems to be 2 kits on this site that have cracked manifolds, I find it interesting that post above states excessive manifold pressure and then these cracked manifolds, that may be it but I have no idea.


This turbo makes power for sure, just a lil laggy but should support over 600WHP for sure.

 

Well... I know the measurements since I have one of those. And why talk about exducer diameters when the normal way to state the size of the comp. is the inducer...

The exhaust backpressure is severe on a 2 litre even with the 10cm2 exhaust housing.

 

The backpressue is sever in general or only on the Greddy kit? Again everytime I hear about this kit someone says something about that manifold cracking. I am sure teh turbo makes power, it's that manifold I DO NOT TRUST.

 

On this greddy kit. My manifold has not been a problem.

 

i'm noooo pro at all... but a STOCK stroke Evo ... shouldnt be able to full spool a GT35R at 30 PSI at 4600RPM....maybe a 2.3/2.4
but i remember seeing that guy posting his stock 2.0 and a GT35R and it didnt spool until like HIGH...

but like i said i'm no pro... just giving my 2 cents

 

I used exducer diamters because Garrett uses it as a model number for there GT30R turbos i.e. GT3076, GT3071 which have 76mm exducer wheel and 71mm exducer wheels. It makes it an easier comparision.

On another note, a T67 has a much bigger inducer then a GT3076 (55-57mm). Almost as big as a GT35R.

 

Yes but normally the inducer is the one to compare, that is what mainly says the amount of air the turbo can deliver.. The relationship between inducer/exducer says if the turbo is designed for high pressure or not, big difference in size of in/ex = can take lot of turbo pressure.

 

Talk to STFU tuning, He has done so. It is proper tuning and again it is third Gear, not 1st and it is also the BEST example.

Kinda like me saying...

"HEY CURT BROWN RAN A HIGH TEN AT 124MPH ON HIS STOCK TURBO, IMA GONA DO TEH SAME WITH MY STOCK TURBO"

I should only be so lucky..... ALthough I hope to hit that trap with a 50Trim

 

i stand corrected

 

How many miles have you had on your kit? Did you make any additional bracing on the turbine housing or support the manifold or wastegate in anyway besides what came with the Greddy kit?

Brian