Ive noticed that in the past few logs, my timing is off at start up compared to the closed tps vs rpm. By as much as 5-7 degrees lower than on the table, in park, Has anyone noticed this and what might be causeing it. The lower timing is effecting the vacuum, and I need all I can get for the brakes.

 

? you need all the vacuum u can get for your brakes during start up?

 

NO, is not like it sounds, I need all the vacuum for my brakes all the time, its just when the timing is lower I have a lower vacuum, not much but alittle. And if the timing is retarded when its cold by 4-7 degrees it gets me alittle less vacuum...I really didnt need to include that line but oh well.

 

Check out the "Spark Correction vs. MAP vs. Coolant Temp" table. Also, as an additional task, make sure that your "Main Spark Advance" table will blend well into your closed TPS spark table for the appropriate speed/load points.