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Old 14-08-2010, 03:33 PM
Howerton Engineering
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Default Re: Considering w/m injection for my supercharged z4m

Depending on the mix and jetting you use, AFR's will typically drop .5 to 1.0. Whether this still makes power or pulls timing excessively depends on the programming of the ECU. Some cars will tolerate down to 10.5 with too much issue, some don't like to be below the high 12's.

I think tuning it with the kit/jetting maybe possible, but in the long run setting the jetting right for the application then having the car re-tuned will give the best package.
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