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Oops!!! I blew up my engine...
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<blockquote data-quote="93Cobra#2771" data-source="post: 4136040" data-attributes="member: 4599"><p>That is certainly a possibility, I suppose. I do know of quite a few tweecer users using that method, without the results you experienced. Plus, at WOT, the EEC ignores any feedback from the O2's, so it's possible the problem you were experiencing may have been related to injectors/fuel pump being maxed. Pure speculation on my part, of course. No way to know without datalogging the run, though.</p><p></p><p>Clearing the KAM (keep alive memory) DOES affect WOT fuel trims, though. So it's very possible that your tune was off enough to confuse the EEC on what it should have been correcting. Remember that the EEC takes data from closed loop/normal driving and interpolates that data to WOT fuel trims as well. On a side note, a Ford engineer who developed the hardware for the EEC recommending clearing KAM before ANY drag strip run, to rule out any fuel trim tampering with the a/f during the run.</p><p></p><p>Conceivably, if your combo wanted to run rich during normal driving, the eec would correct that by leaning it out some. Then, since the eec doesn't have a way to check the a/f at WOT, it might apply those same fuel trims at WOT. But that motor may have need MORE fuel at WOT. By the way, this scenario can EASILY happen with an aftermarket MAF, as they are often tuned a little rich at low airflows.</p></blockquote><p></p>
[QUOTE="93Cobra#2771, post: 4136040, member: 4599"] That is certainly a possibility, I suppose. I do know of quite a few tweecer users using that method, without the results you experienced. Plus, at WOT, the EEC ignores any feedback from the O2's, so it's possible the problem you were experiencing may have been related to injectors/fuel pump being maxed. Pure speculation on my part, of course. No way to know without datalogging the run, though. Clearing the KAM (keep alive memory) DOES affect WOT fuel trims, though. So it's very possible that your tune was off enough to confuse the EEC on what it should have been correcting. Remember that the EEC takes data from closed loop/normal driving and interpolates that data to WOT fuel trims as well. On a side note, a Ford engineer who developed the hardware for the EEC recommending clearing KAM before ANY drag strip run, to rule out any fuel trim tampering with the a/f during the run. Conceivably, if your combo wanted to run rich during normal driving, the eec would correct that by leaning it out some. Then, since the eec doesn't have a way to check the a/f at WOT, it might apply those same fuel trims at WOT. But that motor may have need MORE fuel at WOT. By the way, this scenario can EASILY happen with an aftermarket MAF, as they are often tuned a little rich at low airflows. [/QUOTE]
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Oops!!! I blew up my engine...
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