Turbo Diffrences

[adrian222]

can someone please clear me up on the difference between a r32 rb20det standard turbo and a r33 rb25det standard turbo. everyone i ask says something difference.

[hypergear]

R33's turbo has larger housings.

[Dale FZ1]

Comp housings definitely are different sizes. Didn't pick any easily measurable difference on the turbine side for either housing or rotor between RB20 and 25.

Also RB20 comp impeller is smaller inducer + exducer. Just a smaller unit, flows less. Later series 2 RB25 also went to a nylon/composite impeller. Lighter weight.

[Lithium]

Turbine housing is SLIGHTLY larger a/r for the RB25 turbo, runs the exact same wheel. The compressor housing is also slightly larger as said, and from memory is around 66mm exducer vs 60mm for the RB20 turbo. Can't remember the inducer size, but its definitely a couple mm or so larger too.

The series 2/Nylon compressor wheels seem to be a bit larger again, from the ones I've looked at

[mad082]

s2 and s1 33 turbos are the same size, just have the different compressor wheel material. the r34 turbo is bigger than them though.

[Lithium]

s2 and s1 33 turbos are the same size, just have the different compressor wheel material. the r34 turbo is bigger than them though.

I am fairly sure ages ago I had a S1 and S2 pulled apart side by side (back in my stock turbo days, so this is like 5 years ago and brain fade could be coming into play) and the S2 compressor was as you say, made of different material but was also a little larger... also the composite S2 wheel was a "single blade" style design while the S1 one was twin blade.

[mad082]

yeah the blade design is different (due to the different characteristics of the materials) but as far as i'm aware the size was the same. but i'm no expert on it so you may be right and i may be wrong. i was only aware of the r34 turbos being bigger

[XxNinjaxX]

anyone know if a R33 compressor housing and compressor wheel can be transfered onto a rb20 turbo? for slightly quicker boost without restricting the airflow?

[bubba]

anyone know if a R33 compressor housing and compressor wheel can be transfered onto a rb20 turbo? for slightly quicker boost without restricting the airflow?

Don't see why not, people do some bastardising with RB and VG turbos.... have a search for the 240kw $300 turbo or whatever it was...

[XxNinjaxX]

cool, only reason im asking is cause im buying a cheap rb20 turbo for 100bux and theres nothing wrong with my r33 turbo except its a bit whiney when im cruising off boost (which is why im replacing it) so i thought i could do a bit of a swap between to two so im not losing out.

[TUF250]

sorry to hijak but i dint want to start another thread.

Is it just the exhaust housing that is larger on the r34 turbo? would this be a worth while mod for an R33 with just breathing mods?

Also are the r33 and r34 turbos ball bearing or thrust bearing?

thanks

[R31Nismoid]

No, it is a pointless modification to take a R33 turbo off and change the rear housing to OP6

The R34 turbo only makes around 10rwkw more anyway.

[bubba]

I searched and searched and couldn't find that thread about the $300 240kw DIY turbo, oh well.

[TUF250]

ok thanks for the reply. what about the bearings?

[Spurdo]

i believe the rb25 didnt get a ball bearing turbo until the r34, along with a steel compressor wheel i think

[wolverine]

i believe the rb25 didnt get a ball bearing turbo until the r34, along with a steel compressor wheel i think

No.

[Spurdo]

no?

correct me if im wrong

Edited July 3, 2010 by jonboy

[Marcus89]

r34 is still not BB or steel compressor

[TUF250]

yeah i knew they were still nylon compressors but wasnt sure about the bearing centre.

I always thought they were thrust bearings but I read the other day they were BB hence why I wanted to check. Cheers

[wolverine]

They are all BB.

If you perform a search and go back far enough this information has been covered so many times but every new thread that gets opened with more misinformation means there is even more for the next person to trawl through.

I understand that it can be hard to search when there are lots of threads on the same thing but it is worth the effort and there are very few questions that haven't been asked or answered on SAU over the last 7 years or so.