I want something better than the 86/87 piece, and also better than the 2 stage 88/89 piece. Here's what I know: Longer runners= lower resonant frequency, shorter runners=higher resonant frequency, and runner length being the same, a larger plenum lowers the resonant frequency, while of course a smaller pleneum raises the resonant frequency. When I say "resonant frequency", I mean the frequency of the pulses of air traveling back and forth through the runners. The resonant frequency directly affects the volumetric efficiency of the engine at that rpm. (Have you ever built a tuned ported sub box? The exact same principles apply, and you can see how this works with any box building program on your computer) With a turbo engine, however, things get different, because now the air in the manifold is compressed, at a higher density, and just like a stiffer spring, vibrates at a higher frequency. This is why turbo engines make more power with a larger plenum, because the larger plenum gets the resonant frequency back down into the engine's operating rpm range. So, what manifold has a nice large plenum and long straight runners, and is compatible with the A20? Actually, first ,what manifolds fit on the A20? I have heard that the bolt pattern is identical for the top bolts with the B16 manifold...? What are the differences between the B series manifolds? All I know is that the runners are WAY too short on the type R maifold. Is the GSR manifold a 2 stage? If so, fuck that. When I put my modified 2 stage 88/89 manifold on my car, it slowed it down...So far, the best looking manifold to me is the Skunk2 LS integra manifold, big plenum and long straight runners. I know that the manifold I want is not going to be intended for a high revving engine, like the type R, because the runners will be too short. How about the CRV B20 manifold? If any of you guys know anything about this, let me know, I'm taking my turbo A20 to the next level.
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