Quote:
Originally Posted by takid455
Erik - Regarding the misfiring/ Cam syn, was it a wall at 4500 or could you let off , get back on & continue to higher rpms? Did it only occur under load or all the time even on a stationary rev up?
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Mainly occurred under load at about 5000rpm. It was as if you activated a two step, scrambling the cylinders. It would always pop out of the exhaust just before it would misfire. We thought we had a lean condition at first but that wasn't the case You could free rev it and it would sound fine. Strangest thing was the ignition timing in the data log was rock steady and no spark plug looked any different than the other. In fact, they looked brand new after every pass. It was mind boggling. As it turns out, the Holley Dominator did not like to process the cam sync signal from this Ford style sensor as "digital rising". As soon as we set it back up in a "digital falling" arrangement she straightened right up and came to life.
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1964 GTO
501, Edelbrock Heads NA, 3460 lbs.
9.76 @ 137mph
1971 Trans Am Lucy Blue, 11.56 @ 115
1966 LeMans. 6.0L LS single turbo, 8.85 @155 mph
1976 Trans Am twin turbo 462, SD Edelbrock heads 8.03@171 mph
2009 G8 GT
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