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RB20 Intake manifold mods

Cool Hand Luke
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Cool Hand Luke Community Regular

Cool Hand Luke

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Is there any power advantage in changing/modifying the intake manifold on the rb20? I saw in zoom they modified an RB26 manifold to fit and lost hp even with a hks 2530, and have also seen the standard intake with the throttle body fitted to the front. Anyone had any experience with this?

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https://www.sau.com.au/forums/topic/17857-rb20-intake-manifold-mods/
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meggala Grand Master

meggala

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I wouldnt do it nissan spent millions on the design see as tehy use it right up to the r34 so it must be pretty good theonly thing comaprable it the greddy plenum but they dont make one for the rb20. Ihave seen a few jap designs and most of them taper so it is quite small at the back of the manifold

meggala

Roy Grand Master

Roy

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dido,

the Gibson Motorsport R31 GTS-R used the same manifold as we all use day to day.

When upgrading exhaust manifold, turbo, IC, cams etc for homologation they didnt see the need to change the inlet manifold, so its good enough for me.

I have noticed that GTS-R inlet manifolds dont have a PCV valve near the coolant bleed, but to the best of my knowledge thats about is as far as differences are concerned.

  • 2 weeks later...
S13 Silvia Enthusiast

S13 Silvia

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Posted

I've done an RB20 into S13 conversion.

If you use the R32 gts-t crossmember's and engine mounts, you will have a bonnet clearance problem.

If you can source an A31 Nissan Cefrio crossmember and engine mounts, it should clear it because they came stock with an rb20 but using the silvia chasis.

Other than that, you need a spacer between the chasis rails and the crossmember, custom engine mounts or to trim the inside gutting of your bonnet right down.

Cool Hand Luke Community Regular

Cool Hand Luke

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I dont have too many clearance problems, im going to stick with the standard intake for now anyway. The only thing that happens is that the BOV touches the heat shielding under the bonnet, and on pipe just rubs so slightly enough to shine it up on the shielding aswell... The guy who i bought it off had an rb25 in a s13, he had to cut the bracing from the middle and remove all the shielding for it to fit with custom mounts

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