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Hi Steve here, am a new member.

I'm searching for any members that can give detailed advice re rb30 rebuild. We are part way through build, engine is going in hr31 coupe for track work at club level, hillclimbs.

Rb30 block, forged pistons, rb25 head, Greddy farward plenum, Camtech cams 262degees, 9.5mm lift, vernier gears.

As we are buying engine in bits as we go I now need to know throttle body dia as I have two at 70mm off rb20 and rb30.

I dont have rb25 exhaust manifold but I have the rb20, are they the same? Turbo recommendation so far is Garrett GT37R-63 with 50mm ext waste gate running into existing 75mm side exhaust, no cat or muffler. Will be fitting 600 x 300 front mount. I would like some advice as I dont want to reinvent the wheel or turn around when its finished and find I fitted the wrong bits.

Any help would be appreciated

Regards

Steve

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