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Rb20/25/30

wlspn
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wlspn Proficient

wlspn

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I currently have an RB20 in my R32 but will soon be changing to either an RB25 0r 30. Do these 3 blocks share the same bellhousing pattern? i have an R33 manual box which I plan to recondition, put behind the RB20 for now & then leave it in when the engine gets swapped. Can I do this? Also how bout clutches? Any difference? Cheers

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Travis Trayhern Proficient

Travis Trayhern

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all the same bolt pattern not sure about the flywheel/clutch, got rb30det with the rb25 box and a few less gifted of a brain down my way thought it would be smart to build a rb30det with a rb20 box because they are so cheap which lasted a week. so they all bolt up dude

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bubba Grand Master

bubba

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Yes they all bolt up. I'm running an RB30DET, had an RB20 box behind it, now an RB25 box. Also had the same clutch behind my RB20 as I now have behind my 30 (and clutch originally came off a 25).

Edited by bubba
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BigC1988 Enthusiast

BigC1988

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they all fit, but that sed if your going from a RB20 to a RB25, it isnt advisable to put a torquier motor infront of an inferior gearbox (RB20 box). The torque will eventually rip the box apart.

À friend of mine just told me that the gearbox wont hold the HP of the engine (planning on boosting 20psi). So I will use the RB25 gearbox. What should I do??

Thanks for the help

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BigC1988 Enthusiast

BigC1988

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I currently have an RB20 in my R32 but will soon be changing to either an RB25 0r 30. Do these 3 blocks share the same bellhousing pattern? i have an R33 manual box which I plan to recondition, put behind the RB20 for now & then leave it in when the engine gets swapped. Can I do this? Also how bout clutches? Any difference? Cheers

The bellH (r33) will fit on a RB25 but the clutches are diffrent if its turbo/ non turbo.

The clutches of a non tirbo are smaller then the turbo.

I have a rb20 bellH (non turbo) with RB25 clutchs and it fit.

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BigC1988 Enthusiast

BigC1988

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You should search. There are a few threads that detail how to go about putting a 25 box in a 32.

Oh and boosting 20psi means nothing. What turbo are you using?

Still cant find any good guides :blush:

Now I have a T28. Planning to go GT35

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