BMW 3-Series (E90 E92) Forum - View Single Post - PTF UPDATE: 553WHP 631WTQ

Joshboody · 11-28-2012, 08:48 AM

Air density is always more powerful then mechanical advantage, BUT both is even better. The CR limits are because of knock, but DI allows higher CR (less knock) so you really can't compare to PI.

11-28-2012, 08:48 AM	#165
Joshboody Lieutenant Colonel 65 Rep 1,708 Posts Drives: pickemuptruck Join Date: Jul 2009 Location: Phoenix, AZ iTrader: (7)	Air density is always more powerful then mechanical advantage, BUT both is even better. The CR limits are because of knock, but DI allows higher CR (less knock) so you really can't compare to PI.
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