Best ITB runner length for E head?

[SSS]

I'l be cutting down an E intake manifold (FWD version) for ITB's of my own design, a large plenum with a 3" inlet (and same sized piping to my Z32 MAF) will be sealing the manifold in preparation for boost.

Does anyone know the optimum length of the runner i should use?

I've mucked around with the calculator on THIS page, but 20" of runner length seems a little too long for 2nd order harmonics between 5500 and 7000rpm.

SCV gear has been deleted on this manifold, and the engine will be retaining stock rpm limiter.

[deviousKA]

11 inches realistically, with about 44mm inner diameter of the runner is optimal to keep a ka in good range (full powerband, all the way to 7000). On my setup, i can go from 9-11 inches depending on which velocity stacks i decide to use that day . If i still have your email, which i think i do, i shoot you some info/pics etc... here in a bit.

[SSS]

Thanks mate. You can send the info to sss at antrx dot com if you haven't got one of my other addresses.

[Chingon]

I'd like some info too

shoot me a line @ [email protected]

I'll be tackling a similar project soon..

btw... isn't 44mm inner diameter too much for the low revving ka?