rb20 hiflowed on rb25?

[L 33]

Just wondering if a rb20 hiflowed turbo would fit on a rb25. would there be any resrictions in the turbo even though its been hiflowed.

[BHDave]

If it was a late model rb20 turbo with the same water line banjo size and it has had a decent increase in wheel size then i don't see why not.

If it's just been rebuilt with steel wheels than probably not.

[L 33]

yeah it has, the only difference that i can see between the two turbos is the outlet pipe to the cooler is 4mm smaller than the stock rb25 turbo. would this pose a problem in regards to flow, keeping in mind that the internals of the hiflowed are a lot bigger than the rb25.

[L 33]

some one must know.

[RB30-POWER]

The early RB20 turbo's (early silver top) have a way smaller turbine housing and compressor cover and outlet when compared to the RB25 unit.

Even if the units were high flowed you wouldnt have the meat to machine out of the cover that the rb25 unit has.

Im led to beleive that the later series rb20det have a bigger turbo, more comparable to the rb25 unit.

I say avoid them where possible, get a rb25 highflowed, should fit bigger wheels.

[Sydneykid]

Ask the person/workshop who did the hi flow:cheers: