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I have just come across a really cheap RB25DE form an R32 so non VCT.

I would like to know the following :

what is the comp ratio of the RB25DE?

what will the comp ratio be with an RB30e bottom end with n RB25DE head bolted on be?

I would be using everything from my current setup

blitz FMIC

GTR injectors

GTR fuel pump

splitfires

3" turboback

slide RB25 hiflow

remapped ECU would be redone for new engine

currently putting out 238rwkw on my low k RB20 and no problems. I am just thinking the extra capacity would be a nice addition.

I would need to run 19psi so comp ratio will be important to prevent detention.

any input appreciated :)

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https://www.sau.com.au/forums/topic/156893-rb25de-t-vs-rb30det/
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if you have a look in cubes avtar at the 30 guide it tells you the comp ratios for the diff heads

with bigger bottom end more exhaust gas spools turbo easier boost to your hearts content

Edited by mattymagoo22

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