Quote:
Originally Posted by LateralG'z
Cobb has much better AFR than JB. I think I would be worried to JB on my car
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The Cobb runs much more boost down low with less advance to make its torque, so it needs to run a richer AFR. The JB4 on the other hand runs less boost and more advance (which is more efficient) and thus runs a leaner AFR. This is a direct injection motor so the old rules don't really apply and running too rich down low at lower boost levels just wastes gas. Keep in mind 7500+ cars have been running the same basic boost/AFR/advance pump gas curve over the past four years with zero related issues.
The JB4 map 6 runs above are custom tuned are being dialed in. Those require more fuel for the boost levels being used and are under development.
These are Stage2 maps with downpipes. The last round of testing was on Stage1 maps with factory downpipes.
Mike