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      10-27-2009, 11:16 AM   #17
marconi118
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Drives: 06/07 e93 335i
Join Date: Nov 2008
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Quote:
Originally Posted by Joshboody View Post
Yes, of course a/f ratio is adjusted by the O2 sensor... i'm use to carburated non-computer controled engines. So >30% code... even with tune? This shouldn't be an issue though, 30% from 14.7/1 is way too rich anyway right. The prob would be maxed boost, IAT per rpm meaning very increased fuel delivery rate throwing code... but of course not an issue cause people are running >450hp. So with a tune I expect A/F ratio is being adjusted by DME with slight signal input from tune to enrich??
JB3 and Procede alter the HPFP fuel pressure signal. In practice turbo boost and HPFP pressure are increased so that DME can achieve the target A/F vith injection timing not greater than 30% of the base injection timings in the tables.
O2 sensor signal is altered to obtain that the DME uses a different A/F that the target A/F in the DME.
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