Care to explain what would cause the lean condition?StangPro said:Doing this will cause you to most likely run lean under most normal driving conditions. You need to remove EGR from the computer cal not just turn off the light.
Really? Could you explain wich calibation maps we are talking about here? Since you wer talking about normal driving conditions, I would assume you are talking about the Maf transfer or the stabalized fuel table. Neither of which are tied to nor need to compensate for egr. The only thing I can find tied to egr performance wise is timing. Sooo, if you have some more insight on your theory please explain, but if you are simply pulling this out of your ass, please don't add to the growing wealth of false information on this board already.StangPro said:A little leaner, true, but not dangerous. It is important to note it does change the A/F ratio for thosae running on the lean side anyways. They can be pushed into dangerous territory. The stock calibration maps can't compensate for no EGR on their own as EGR is mapped into them.
jstreet0204 said:Really? Could you explain wich calibation maps we are talking about here? Since you wer talking about normal driving conditions, I would assume you are talking about the Maf transfer or the stabalized fuel table. Neither of which are tied to nor need to compensate for egr. The only thing I can find tied to egr performance wise is timing. Sooo, if you have some more insight on your theory please explain, but if you are simply pulling this out of your ass, please don't add to the growing wealth of false information on this board already.
As a side note, I ran mine without the egr or several weeks before changing the tune, and there was no change to a/f according to my wideband. The only noticable difference was part throttle bucking caused by the added timing.
Partly correct, timing is added under egr based on rpm and load, and is a function of the spark_base_egr_multiplier. BUT there is no need to compensate for it in any tables. Simply setting the egr_system_type scalar to 2 takes care of everything.StangPro said:To clarify, EGR under warm cruise adds timing so it must be compensated out in the timing tables.
I still don't see it causing any lean condition especially under closed loop normal driving where adaptive tables make any needed changes.StangPro said:The lean condition is simply a function of the air coming in versus the former air (exhaust). There's no direct calibration needed for this, it's just a matter of backing off the timing under warm cruise and turning off the signal that causes the MIL.
Make more sense?
trinity_gt said:EGR recirculates exhaust gases (inert, non-combustible) back into the intake tract under certain conditions to reduce combustion temperature which reduces the formation of oxides of nitrogen (NOx), a pollutant. EGR is disabled completely at idle and at WOT, instead being fed in during part-throttle operation when spark advance is near the maximum.
Because EGR is disabled during WOT, you won't get any more power by disabling or removing it.
Indeed, because EGR tends to reduce peak chamber temperatures, by removing it you might just make the engine more prone to detonate under transient throttle conditions (so called "tip in spark knock".)
Just leave it be.
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