Quote:
Originally Posted by gmd2003
Stock AFR's are in the 12's at the 5k rpm range , these are at 14 that's quite lean in a high compression motor if they are accurate . Just look at the stock logs in the S 63 TU database .
George
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Here is another dyno from another completely stock car on a completely different dynojet. AFR seems about the same here too as read from the tailpipe.
PS. I asked BMS and they said they read the AFR from the OBDII port factory wideband sensors instead which are more accurate and allow you to monitor both banks simultaneously. So the AFR shown on the dyno is just whatever the dyno read from the tailpipe if they happened to insert it properly for that particular run. Often it comes loose. They also said the DME is fully aware of the true air/fuel ratio. If it gets out of tolerance the DME can and will throw a limp mode.
