Quote:
Originally Posted by Ed Wright
If it is better with a muffler, it makes me wonder, is it in closed loop? First, that is not what you want. Second, if you insist on closed loop make sure you have the minimum closed loop RPM to something like 4000 RPM. You DO NOT want the ECU making fuel corrections at lower RPM with open collectors. Pulling oxygen back in the collector during the overlap cycle with big race cams. It will make false corrections due to the O2 "seeing" thar oxygen and returning a false lean indication to the ECU, causing a very rich mixture.
Are the spark plugs black after an extended idle?
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Open loop. Only using the O2 sensor for dataloging and manual quick tune. The O2 sensor is in the collector so it does not read acurately at any thing below 3500. I have put a 2 foot curved extension on the collector to get the idle settings close.
The plugs look dark but not sooty or wet. They look like they have always looked.