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      12-06-2011, 08:54 PM   #48

Drives: X1, 335i
Join Date: Sep 2006
Location: SF Bay, CA

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Originally Posted by leigh View Post
yeah but how do you know what size injecter and where to put it?
We aren't using methanol injection for fuel enrichment so meth nozzle sizing isn't critical. We are using it for cooling and octane enhancement. Also, the DME also runs closed loop fuel under load so it targets the desired AFR regardless of methanol injection volume. This is why we use the same system in boosted and NA applications alike. For those running higher power applications, we can always add a 3rd 1.0mm nozzle which will result in a higher effective octane bump and more cooling (especially useful in non-intercooled SC applications). But this would be overkill in anything less than 500whp IMHO.