HKS GT2835 pro s seems the go but, $$$$

[gtst25]

That dump comes with the kit from greenline.

[SLY33]

19psi!? i dont think so! the 266rwkw is made at just 16.5psi. I want to wind it up to about 18 maybe 19 once the cams go in.

That sexy dump is none other than a genuine HKS one!

[Cubes]

Sly33,

Grepin has had problems trying to push more than ~16psi in the top end through his 2835ProS as it tails off.

[SLY33]

Sly33,

Grepin has had problems trying to push more than ~16psi in the top end through his 2835ProS as it tails off.

yeah he's told me, possibly because of the cams. So far i havent tried anything more than 17psi, which it holds right to redline. Even if it drops off once the cams go in, you can still run more boost through the rest of the range and get more power/torque.

At the end of the day though the 2835ProS is an awesome little piece of kit!

[gtst25]

19psi!? i dont think so! the 266rwkw is made at just 16.5psi.  I want to wind it up to about 18 maybe 19 once the cams go in.

That sexy dump is none other than a genuine HKS one!

Sorry 'bout that - my mistake!

[Cubes]

yeah he's told me, possibly because of the cams. So far i havent tried anything more than 17psi, which it holds right to redline. Even if it drops off once the cams go in, you can still run more boost through the rest of the range and get more power/torque.

At the end of the day though the 2835ProS is an awesome little piece of kit!

From what I remember he's always had the 2835ProS dropping boost even with the stock sticks. He slapped the big sticks in still drops boost the same but obviously more air is flowing.

I remember he said the wastegate is being blown open as if you hold it shut manually it will make the boost and power repectively.

Maybe its a dump pipe design issue with his, I can't remember what dump he was running.

[gtst25]

I see in the catalogue that if you buy the turbo by itself it comes with the option of 0.68 or 0.87 A/R housings.

http://www.nengun.com/catalogue/product/554

I've contacted both companies and they say that it can only come in kit form with the 0.68 A/R housing.

Maybe that's his problem - maybe he's got the turbo with the smaller housing?

I'm not sure what to do now - I don't want to buy a kit with the smaller housing if it won't perform...

[Cubes]

Its the .87.

[180bfj20det]

Im sure you can fit the GT30R. Doesnt this bolt up? If not, you would only need the place a spacer bt the manifold flange and the turbo to offset the turbo from the manifold. I got my turbo for less than 2k, and it isnt a laggy turbo for the RB25. Think of what you want because the little drivability gain you will gain from the turbo you are looking at maynot be worth it when you can save money with the GT30, still have a responsive package for your aim assumming an aim of 250-300rwkW. I have the GT30 on my 2L, it hits full boost at 4krpm. I know of someone with the same turbo on his RB25 and he makes full boost at 3.5krpm.

[SLY33]

i have lots of ppl asking me "What A/R did you get?"

***Edit*** now im confused myself.. i thought i had the same turbo as grepin with the 0.8x A/R but it seems greenline where i got it from only sell a 0.68 A/R version. The USA HKS site also lists TWO int gate versions, and i was under the impression that only one size A/R was available in internal gate, and that it was 0.8x A/R.

..So if you get the comprehensive kit that i got from greenline, just order it and it will all be sweet, there is nothing to choose

Also getting lots of PMs about what comes in the greenline kit. EVERYTHING comes in the kit. (F-con mini is no longer part of the kit -you dont want it anyway.)

cheers.

[RedDrifter]

I am waiting on nengun to give me a price on this kit for an RB20 aswell.

Would be laggy but would have to be no worse than the turbo I got.

Would be nice to gte 250 rwkws from less 18psi.

[Cubes]

Red Drifter,

The RB20DET will always struggle to make the power you want on less than 18psi. The valves and ports are too small, drop a set of lumpy sticks in to it and you will then have half a chance, stock.. I seriously do not think it can be done.

also...

HKS only offer two size exhaust a/r's.

.68 and .87

Possibly their a/r's are 'slightly' larger than the garrett units due to a power porting or similiar method of increasing flow/efficiency.

3037ProS

http://www.hksusa.com/products/?id=1671

2835ProS

http://www.hksusa.com/products/?id=1670

[aza]

has anyone put a 2835 on a rb20 if so what when did it make full boost and how much lag was there as im looking at either this or gtrs