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You wide-open-throttle setting are set rich, and the PCM will not add extra fuel for mods without being reprogrammed. In theory, an airbox or exhaust mod would help lean out the misture.
At normal driving the PCM tries to maintain 14.7, but at WOT, the extra fuel required for safe operation is added by a special multiplier that does not change automatically
I went with the Halltech first and then went to the LPE when it came out. Dyno numbers definitely showed and improvement through out the power band in both TQ and HP.
Last edited by midnite902; Feb 19, 2006 at 02:01 PM.
I went with the Halltech first and then went to the LPE when it came out. Dyno numbers definitely showed and improvement through the power band in both TQ and HP.
You wide-open-throttle setting are set rich, and the PCM will not add extra fuel for mods without being reprogrammed. In theory, an airbox or exhaust mod would help lean out the misture.
At normal driving the PCM tries to maintain 14.7, but at WOT, the extra fuel required for safe operation is added by a special multiplier that does not change automatically
david, i have always respected your opinion but this statement has me puzzled. under wot / open loop, the pcm doesn't use o2 data for a/f purpose, but does use mass air, ect, tb opening data...etc...so, if someone were to install an aftermarket intake to increase amount of air coming into the engine under wot, the mass air will be able to measure the "exact" / "additional" amount of air that is coming in. which pcm should be able to see it and add additional fuel required. if someone is using a speed density system, there is no mass air meter, so there is alot of assumation from other sensors that pcm use for a/f calculation, under wot...therefore if someone is using a speed density system, the pcm will not see the change (in this case, a higher flow intake) since it is making a/f calculation base on certain "assumptions" and will be a little leaner then before the aftermarket intake. am i missing something here?
david, i have always respected your opinion but this statement has me puzzled. under wot / open loop, the pcm doesn't use o2 data for a/f purpose, but does use mass air, ect, tb opening data...etc...so, if someone were to install an aftermarket intake to increase amount of air coming into the engine under wot, the mass air will be able to measure the "exact" / "additional" amount of air that is coming in. which pcm should be able to see it and add additional fuel required. if someone is using a speed density system, there is no mass air meter, so there is alot of assumation from other sensors that pcm use for a/f calculation, under wot...therefore if someone is using a speed density system, the pcm will not see the change (in this case, a higher flow intake) since it is making a/f calculation base on certain "assumptions" and will be a little leaner then before the aftermarket intake. am i missing something here?