HOW TUR­BOS AND ITBS COEXIST

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All this time you’ve been think­ing in­di­vid­ual throttle bod­ies and boost ought to re­main ex­clu­sive to one an­other and you’ve pretty much been wrong. It turns out that mul­ti­ple throttle bod­ies and forced in­duc­tion get along just fine, too, thank you. Ask the turbo and it’ll tell you all it wants to do is com­press a whole bunch of air—it doesn’t care where it goes af­ter that. Un­like nat­u­rally as­pi­rated lay­outs where that pile of throttle bod­ies can in­di­vid­u­ally suck up the oxy­gen right in front of them, hav­ing a turbo in their way means some sort of man­i­fold’s got to be there to tie it all to­gether. The man­i­fold doesn’t just send air from the turbo’s com­pres­sor out­let to the throttle bod­ies, it does so in an evenly dis­trib­uted sort of way and with the sort of crisp and im­me­di­ate throttle re­sponse you’ve come to ex­pect from a mul­ti­plethrot­tle body lay­out. But there are draw­backs. Tun­ing can be more of a chal­lenge, for in­stance, since both man­i­fold pres­sure and throttle po­si­tion now have to be con­sid­ered when con­fig­ur­ing engine man­age­ment fuel ta­bles. Get it right, though, and you could end up with the best of both worlds.

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