RB20 Intake manifold mods

[Cool Hand Luke]

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?

[meggala]

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

[TTT]

If you are thinking about this to make shorter pipes for the intercooler there are other ways to get shorter piping..

Like this one from BOOSTMEISTER who is from these forums..

[Roy]

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.

[Cubes]

Why not just fit thermo's and have the piping go inbetween the radiator and the front of the motor allowing enough room for cam gear adjustments if need be?!?

[justified2.4]

many people in the US go with a custom intake manifold on their s series chassis is because the stock does not clear the hood on the swaps. I like the piping Boostmeister has though, I wonder if it will clear my hood on my s14

[S13 Silvia]

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.

[bbenny]

Re; the Boostmeister piping, would that sharp bend cause any flow losses?

it looks sweet hey!

[Cool Hand Luke]

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

[VLRB20DET]

the design of it looks good but im not sure of its flow!