Lesson learned

[odd boy]

I posted (http://forum.efilive.com/showthread.php?t=8141), that was for tuning a big cam (610 on 98 Camaro). I faced a problem which is getting the car rich all the time, even when I reduced the VE numbers by 60%. After looking here and there I found that the injectors were too too too big for that application, in a way that the car never gets the right idle, never reaches the commanded AFR. I found the following:


1. At WOT, the duty cycle was around 55%.
2. At idle (when the throttle is closed and the car is not moving), the duty cycle was 1~2%.

My personal recommendations are: at WOT and high MAP, duty cycle should be greater than 70% and not exceeding 80%.

Don’t accept duty cycle less than 3~5 % at idle. Really, small sizing mistake made the tuning too difficult.

Looking forward to hear your valuable comments.