Difference Between R32 And R33 Highflowed

[matthew0786]

as topic states, is there any difference after being highflowed from GCG if fitted to a Rb25?

sorry, this topic probably has been covered many times

[RB30-POWER]

R33 turbo has larger housings, so its usually rated at stage 2 500hp instead of the lower stage 1 highflow that is rated at 450hp.

If your going to get a highflow make sure you use an RB25 turbo. (identifiable from the 45v2/45v3 etc on the compressor cover, RB20 turbo are stamped 16V)

[mad082]

the rb20 turbo is smaller. generally a non-highflowed rb25 turbo is an upgrade on a rb20, so a highflowed rb20 turbo would probably be just a touch bigger than a stock rb25 turbo. and a highflowed rb25 turbo would be bigger again. if it is going onto a 25, don't bother with the rb20 turbo.

[salad]

the compressor housing is bigger on the rb25 turbo, but the turbine housing is the same size for both turbos

[SLO-W32]

i have an rb20 with a high flowed rb20 turbo done by GCG in it and some extra mods and my mate has the same mods on a rb20 but a rb25 turbo high flowed ad there is a little difference but not much but mine is less laggy. he has driven both and wishes that he had of high flowed an rb20 turbo instead like i did.

[SLO-W32]

sorry forgot to say that is you are putting it on an rb25 stay with the rb25 turbo as you will have no or little lagg at all depending on other mods

[Sydneykid]

As far as I know the RB20, RB25and RB25 Neo GCG Ball Bearing high flows all use the same cores, compressors and turbines. The RB20 and RB25 turbine covers are the same, the RB25 Neo turbine cover is slightly larger. The RB20, RB25and RB25 Neo compressor covers are all machined to suite the same compressor. So it is my understanding that they all flow the same.

cheers

[mad082]

then why is the rb25 turbo a common upgrade for a rb20?

[Sydneykid]

then why is the rb25 turbo a common upgrade for a rb20?

The standard compressor and turbine are larger on the RB25 than the RB20.

The standard RB25 turbo flows the same at 5 psi as the RB20 turbo flows at 10 psi.

Stick the RB20 wastegate actuator (10 psi) on the RB25 turbo and you have a worthwhile upgrade.

But that has nothing to do with the GCG ball bearing high flow compressor and turbine.

cheers

[mad082]

ok, that explains it.

[benl1981]

So SK are you saying the R32 and R33 exh housing are virtually the same?

Thanks