Spark
Based on the settings in your PCM, the car will use the idle tables instead of the main tables. Usually, it's based on less than 1.19% throttle and less than "x" mph. Autos usually have a low mph and manuals usually have an obsurdly high mph (255). Basically, it's off-throttle (idle) vs on-throttle timing.
so, the main spark table is used when I am on the gas greater than 1.19% (or what ever I have mine set to) and idle spark is in control when ever I am not on the gas under both the throttle and mph enable figures?
you know it sounds that simple, but when logging the spark advance, it is hard to distinguish what table the pcm is working off of. I read that you should make all of the tables the same ( I think I will try and see if that works).
On your timing tables do you have a general area (group of cells) with one numeral (27 degrees) or do you have various degrees in a general area?
On your timing tables do you have a general area (group of cells) with one numeral (27 degrees) or do you have various degrees in a general area?
Originally Posted by yobabiesdaddy2001
you know it sounds that simple, but when logging the spark advance, it is hard to distinguish what table the pcm is working off of. I read that you should make all of the tables the same ( I think I will try and see if that works).
On your timing tables do you have a general area (group of cells) with one numeral (27 degrees) or do you have various degrees in a general area?
On your timing tables do you have a general area (group of cells) with one numeral (27 degrees) or do you have various degrees in a general area?
There are some spots on my timing table where a group of nearby cells all have the same values. This is mainly limited to WOT and off-throttle deceleration. The idea of doing this is, it ensures a specific value is commanded for a certian aspect of driving. When decelerating, I found that my car likes about 40* of timing under 2,000rpm. To keep it from jumping around, I have 40* of timing for 1,400-2,000rpm and anything less than .24 grams/cylinder. The effect is the appearance of a flat spot.
See below...cam is 232/238 with P&P 241 heads.
