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NoDOHC · 01-30-2010, 11:50 PM

Wow! I get lost for a few months and Brian has a coil test under way. Great Job Brian!

By the way, in your original post you seemed surprised that you were getting power gains at leaner AFRs, this is completely expected. If you do combustion research, you will see that 0.85-0.90 lambda is optimum for spark-ignited applications. This is independant of boost (although higher chamber temperatures will skew the curve slightly to the rich side). With the cooling you have on that beast, I would expect 12.8-13.2:1 to be your optimal AFR.

Keep up the good work! It will be very useful to the rotary world to have a dyno-proven comparison between the leading ignition solutions.

Like you said, the whole 'my new ignition feels really fast' thing doesn't really prove a thing. Case in point: I was firmly convinced that wiring the 6PI ports open on my '86 was a major improvement in power. Timing it with the G-Tech indicated a significant decrease in low end that resulted is a slower 0-60 time. I was wrong about the major improvement, no mater how sure I was about it.

01-30-2010, 11:50 PM	#23
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	Wow! I get lost for a few months and Brian has a coil test under way. Great Job Brian! By the way, in your original post you seemed surprised that you were getting power gains at leaner AFRs, this is completely expected. If you do combustion research, you will see that 0.85-0.90 lambda is optimum for spark-ignited applications. This is independant of boost (although higher chamber temperatures will skew the curve slightly to the rich side). With the cooling you have on that beast, I would expect 12.8-13.2:1 to be your optimal AFR. Keep up the good work! It will be very useful to the rotary world to have a dyno-proven comparison between the leading ignition solutions. Like you said, the whole 'my new ignition feels really fast' thing doesn't really prove a thing. Case in point: I was firmly convinced that wiring the 6PI ports open on my '86 was a major improvement in power. Timing it with the G-Tech indicated a significant decrease in low end that resulted is a slower 0-60 time. I was wrong about the major improvement, no mater how sure I was about it. __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)