Quote:
Originally Posted by frank316
cmj did that setup have a wideband? a vac gauge? what rpms were you turning and what af's and all that... I'm thinking about buying an egt and documenting some hard data to really get a better handle on how af's and timing affect cruise egts.... I have personally ran my car lean everywhere on the map, full throttle included(28* of timing at wot 17-1 afr's) power sucked but no noticeable ill effects what so ever on the plugs. they were white, but thats too be expected no hot spots or indications of melting..
Ben
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I removed the factory o2 sensor to put the car into open loop and to use my wideband, but I was tuning beyond it's capabilities. Timing was stock. Map voltage was reduced by 30% last wideband reading was 19:1 before reducing a bit more fuel and maxing out the o2 sensor. Average RPMs were 2200-2600. Average MAP pressure was -19.7inHG and maximum was -11inHG.
Took it for a test run and car started smoking, and stumbling. Wouldn't hold idle. I got it home, checked the plugs and found my problem. This being my daily, I decided to forgo any extreme tuning as such until I can find a wideband that is capable of accurate readings at > 18:1