Originally Posted by
WeathermanShawn
Oh yea, Denver is great. Weatherman's dream.
Did USAF for 7 years (2 enlistments) including Fulda Germany, Offutt AFB, and Altus in OK.
Got out and have been in Aviation Meteorology since. Re-started up my interest in cars with the last year of LS1 Camaro production (2002).
Yea, figuring out all the air parameters almost drove me nuts. I basically got Desired Airflow lined up with RAFIG..my car still wanted more air, and worked a lot on lowering the air in the TC Table . Really no more than .25-1g for most Rpms.
Added air with the TF because I personally like the throttle response through the IAC with this parameter. When you push the throttle down..more air..release the throttle..air goes away (TC+Desired,etc).
In all honesty, the working of the TC Table did more to alleviate my bucking than anything else. Now this was bucking that occurs at low cylinder air and with the foot off the throttle. I think with too much air (especially TC), the engine speed doesn't want to fall, but the cylinder air drops as you let off the throttle. By taking air out of the TC, engine speed falls more in sync with the rapid drop in cylinder air as you let off the throttle.
As far as spark advance..I did many many trial and error runs. Some with very little spark, others matching HI-Low & Base Spark and others with a lot of timing.
For me it worked out to be the opposite of what others have found. My car was more smooth in deceleration, throttle response, and had less bucking with more spark advance in the .08-.20 g/cy range.
Perhaps stating it differently, spark advance changes did not effect my bucking issues at all. Lowering the TC air cured 95% of the problem for me. My car does not require much timing at WOT, so the slope of my timing curve is quite steep. But, I like the throttle response with higher spark advance in low cylinder air areas, and then it drops off rapidly as I got WOT.
I match my Hi-LO, and Base Spark tables. Just makes it easier for my mind to sort it out when testing.
Sorry, for the book response here. Hey, I got a lot of open roads out here and the job does not eat up as much time as previous ones.
Need any more help, let us know. Every car is different, just letting you know what worked for me.
..WeathermanShawn..