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HKS GT2530 Vs. High Flowed RB25 Turbo

Waldo

By Waldo,
in Engines & Forced Induction

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Abo Bob Grand Master

Abo Bob

Posted
Posted

That's a lot of money difference so you would expect an equal difference in what you get out of it.

I have a GCG highflow on mine with around 230rwkw at around 0.85 bar. Just sorting out some tuning issues at the moment but it's safe to say that there is more in it turbo wise.

I think it's worth pointing out here that an R34 turbo has a larger exhaust housing than an r33 or r32 one so that might make a difference when they are highflowed.

Trust33 Grand Master

Trust33

Posted
Posted
That's a lot of money difference so you would expect an equal difference in what you get out of it.

I have a GCG highflow on mine with around 230rwkw at around 0.85 bar.  Just sorting out some tuning issues at the moment but it's safe to say that there is more in it turbo wise.

I think it's worth pointing out here that an R34 turbo has a larger exhaust housing than an r33 or r32 one so that might make a difference when they are highflowed.

judgeing from your results you diddnt go the poncams with the turbo upgrade.Did you get a adj exh cam wheel?

great hi-flow.

When does teh garret 2535 come onto boost in the rev range compared to the hi-flow?I found there are 2 versions of it 1 in a 350hp and another in a 370hp version.

:ufo:

lwells Grand Master

lwells

Posted
Posted

What about those GT28RS "disco potato" turbos? From what I have read they blow harder then the GT2530, but spool up is only marginally slower. There are also very cheap: horsepowerinabox.com is running a special through Nissan Silvia for about $1400 IIRC (no idea what flange though).

LW.

Abo Bob Grand Master

Abo Bob

Posted
Posted
judgeing from your results you diddnt go the poncams with the turbo upgrade.Did you get a adj exh cam wheel?

great hi-flow.

When does teh garret 2535 come onto boost in the rev range compared to the hi-flow?I found there are 2 versions of it 1 in a 350hp and another in a 370hp version.

I don't know for sure but I'd be willing to bet that only one of those is a T3 flange.

I didn't go the cams yet although I'd like to.

R34 GTT's don't respond well to adjustable exhaust cam wheels. They are not necessary.

Abo Bob Grand Master

Abo Bob

Posted
Posted
The r33 and r34 turbos are near identical dude...

Yes its safe to say ur turbo has alot more in it considering ur only running 12psi!!

You can expect over 240rwkw with some more boost easily!

I have put a series 2 r33 turbo and my r34 turbo next to each other so I know they are not identical. I started a thread about it on here somewhere.

Sydneykid Grand Master

Sydneykid

Posted
Posted
I have put a series 2 r33 turbo and my r34 turbo next to each other so I know they are not identical.  I started a thread about it on here somewhere.

I have seen 2 different R33 GTST S2 turbos, one was made by Garrett (Air Research) and the other by Hitachi. All of the R34GTT turbos I have seen were made by Hitachi. All of the R33 GTST S1 and R32GTST turbos I have seen were made by Garrett.:P

  • 2 weeks later...
jazza08 Mentor

jazza08

Posted
Posted

I know the thread is now 10 days old so dun shoot me

But for an rb20, what would be the better turbo? Considering id probably want to push slightly past 300rwhp (say 320ish) but wouldnt want an rb25 b/b 450hp GCG turbo if it was majorly laggy on an rb20!

Sydneykid Grand Master

Sydneykid

Posted
Posted
I know the thread is now 10 days old so dun shoot me

But for an rb20, what would be the better turbo? Considering id probably want to push slightly past 300rwhp (say 320ish) but wouldnt want an rb25 b/b 450hp GCG turbo if it was majorly laggy on an rb20!

I don't find the RB25DET GCG ball bearing hi flow at all laggy on the RB20DET. The throtle response is very good, but it does have an excellent exhaust (split dump, 3.52" exhaust, no cat) and is tuned for response via a Power FC. :D

Sydneykid Grand Master

Sydneykid

Posted
Posted

Lots of questions......

The cost is because it utilises a brand new ball bearing core, not plain bearing. A lot of the hi flows rebuild the standard core with plain bearings. Plus it is micro balanced on the latest Schenk and only brand new parts are used. The best part is it works, I have used them on many cars, so have plenty of others and they NEVER fail to perform, I have seen plenty of others that don't. So they aren't expensive, they are cheap.

Depending on load, full boost of 1.2 bar at 3,200 rpm all the way to 8,200 rpm. The turbo will efficiently make more boost than that, but the engine is old and I needed it to last. Well at least until the new RB31DET is finished.

Mods for 225 rwkw ........... combo spilt dump, engine pipe and cat replacement (all in one piece) and 3.25" exhaust. Power FC with Boost Control Kit, RX7 injectors, POD, substantial air feed, heat shield, GTR fuel pump, PWR radiator, electric fan, oil cooler with ducting, remote oil filter, GTR intercooler, my own intercooler pipework, Jun adj camshaft pulleys and tuning. Lots of tuning, for response, I don't care about max power at one rpm point, we went for the best average power.

Hope that clarifies:cheers:

Sydneykid Grand Master

Sydneykid

Posted
Posted
Are the rx7 injectors a straight fit onto rb25's? Someone menthioned that the spray pattern from them are different, can anyone confirm this.

The cheap RB25 upgrade is JDM manual S15 side feed high impedance injectors, good for around 450 bhp.

Spray pattern :confused: I am getting a bit peed off with some of the crap written about spray patterns on forums. I have tried about 20 different injector styles/brands/flow rates in all sizes of RB's over the last 5 years or so, and I will be buggered if I can find stuff all difference in power, economy or emmisions. Tuning makes more difference than injector spray paterns, if you are going to spend more money, then spend it on getting the tune right.:rofl:

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