Quote:
Originally Posted by loesch
The DME in these cars compensates for all kinds of intake and exhaust flow changes. It has set targets for AFR and will compensate to keep the engine within range. That's why we need a flash when we start pushing lots of boost. The DME still thinks we should be having an AFR of 15.5 tapering to 13 when we should be more like 13.5 tapering to 12. I'm not sure where the rough idle stuff is coming from with DPs. I didn't notice any difference.
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thanks for the explanation. In the GTR world once downpipes are added a custom dyno tune/e-tune and bigger injectors is mandatory as the Ecu can only compensate 20% max in any direction.
So people with Dinan software tunes compensate for downpipes just by letting the car's DME compensate for the added flow? I understand JB4 already has the compensation built in but how do DInan people get away with it and also get rid of the CEL light?