Guest Anonymous Posted November 9, 2001 Share Posted November 9, 2001 Heres the deal, I got my a/f gauge in and it shows im runnin all the way rich in boost, but I am detonating in third gear + at 4k rpm up. It does it when i run 6psi or more. I Dont know why, i put in a new fuel filter that was clogged really badly but that didn't help much. I always thought detonatoin meant running lean, but my a/f gauge shows its actually running fairly rich. what else could be my problem? thanks Scott Quote Link to comment Share on other sites More sharing options...
BLKMGK Posted November 9, 2001 Share Posted November 9, 2001 You burning any oil? Is it possible the O2 is being fooled? How many lbs of boost? Seems to me that even full rich if the boost is too high or octane too low you might get detonation. Not sure that flooding it with a firehose will stop it Did it always do this or have you raised the boostchanged the ignition curve? Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 9, 2001 Share Posted November 9, 2001 Also is it intercooled or not? Regards, Lone Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 9, 2001 Share Posted November 9, 2001 Running rich doesn't mean that you WON'T detonate.. detonation is usually a result of high temps in the combustion chamber. Poor or no intercooler, exhaust restriction, etc.. can all cause it. On my 1.8T motor, I peg the A/F meter at anything over 7psi (18psi total), but can still get just a bit of detonation, which the knock sensor is trying to stop, but I can tell it's there. Methinks the air entering your combustion chamber is too hot. By running rich, the excess fuel helps cool the charge some..but it's not a fix-all. HTH Quote Link to comment Share on other sites More sharing options...
TimZ Posted November 9, 2001 Share Posted November 9, 2001 ...Nobody has mentioned timing yet - this usually has the most direct effect on detonation. What timing are you running when this is happening? Quote Link to comment Share on other sites More sharing options...
lifegrddude Posted December 6, 2001 Share Posted December 6, 2001 You can also check your spark plug gap. I had the same problem and gapped mine a tad bit wider. (.044 to be exact using splitfire plugs) That cured the detonation and my car runs fine. My car is a 82zxt. Quote Link to comment Share on other sites More sharing options...
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