Quote:
Originally Posted by shiv@vishnu
I'll say it again for those who havent gotten it get. The only thing that is certain here is the DME tries to target 10-13 deg of timing with a jb3. Regardless of how much or how little boost it is adding. 10-13 deg of timing is mapped by BMW to support 5-8psi of boost. With the power kit, BMW increases boost by approx 2-3psi. And with that small change, they reduce the timing target 2 degrees in the midrange. Just as basic engine theory would suggest.
By contrast, A JB3 increases boost by 6-12 psi and doesnt actively induce any change in timing advance target. Too much timing is the cause of knock. Knock is the cause of piston damage. You do the math.
Or if you feel comfortable with blaming things on a bad block or defective piston, that's cool too.
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I guess the marketing campaign continues. The JB3 runs much less timing than stock and timing is proportionally reduced as a function of increased boost as all BT logs have shown. You keep trying to hitch your wagon on to Sevak's horse but he's running methanol injection at 18+psi almost no taper with full advance. Just like your meth customers. If he knocked it was because he didn't have enough meth at some point and allowed the ECU to encounter full boost and full advance with insufficient pump gas. Likely given the misuse of the safety system. If someone misconfigured your safety they would have the same problem.
Mike