When I run BLMs at 121 at highway speeds ( 1600-1800 rpm @ 50-60 kpa ), I can use as much as 42 degrees of spark advance. But when I tune the car to run at 128 BLM I got spark retard at the same area. That dont make sence to me. As I am in closed loop the ECM should compensate the rich 122 BLM so that the AF is 14.7:1 ?

 

Compare the BPW.



/N

 

ok will do..

 

The BPW is the same. I dont know what my nock count is. I can log the car on 2 diffrent occasion, with the same IAT, same engine temp, same road. And one time I get spark retard, the other I dont..

 

develfish, you should know by now that a KS is useless for performance applications.

 

hehe could be true..

If only the knock where somewhat consistent, then I should be sure it whas false knock. Now it comes and goes, wicked....

 

what are the wideband readings?

 

During the spark retard the blms is around 126, and the WB reads between 14:70 and 15:25.

 

i think I got it sorted. what I did whas to give the engine more fuel at low kpa scale, 20-30kpa, even thou I dont se that low map at 1700rpm it helped with the spark retard. so I whas wrong the KS whas right.