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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 01-30-2006, 10:27 PM   #31
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Originally Posted by MyLittleBlackBird
What needs to happen, if possible, is that the PCM needs to be reprogrammed for a NON-EGR engine. That would eliminate excessive cruise EGT'*. So something to the tune of making it think the EGR is closed full time? Like under WOT. I don't know if that is possible though.
Yep. Retarding the ignition timing at partial throttle would do that.
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Old 01-31-2006, 01:04 AM   #32
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Yeah, but it was doing it on the stock PCM as well. It isn't anything new since the introduction of the Intense Standard. I didn't quite take the time to understand the theory, but does it still apply in light of this information?
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Old 02-01-2006, 01:00 AM   #33
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Originally Posted by big_news_1
Yeah, but it was doing it on the stock PCM as well. It isn't anything new since the introduction of the Intense Standard. I didn't quite take the time to understand the theory, but does it still apply in light of this information?
Yeah whether or not you have the I pcm or stock, your computer thinks some % of exhaust gas is being sucked in during partial throttle. Exhaust gas lowers combustion temps since it displaces air. This also allows for more timing. But without the exhuast gas the timing is too advanced. And your increased compression ratio also raises combustion temps. So the two together may be giving you your condition.
So assuming you don't have a vac leak, you may want to back the timing down at partial throttle.
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Old 02-01-2006, 02:06 AM   #34
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Gotcha. So basically I need my custom tune sooner rather than later.

I'm running a bit richer in the midrange than I was before, but the knock is still there. Wouldn't a rich condition help fight knock? It doesn't seem to have gone away any more than when it was running leaner.
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