AFR < 4000 rpm discusion 14.7 ?
09-10-2007, 12:38 PM
#1
AFR < 4000 rpm discusion 14.7 ? I was told that the car runs in SD mode until 4000 rpms then it goes by the MAF. Is this correct? An that the car is trying to keep it at 14.7 while in sd mode or have I got some terminology wrong or it all wrong?
09-10-2007, 01:10 PM
#3
Wow that was a lot of info in one paragraph!! Thats cool, I understand how the MAf correlates into the SD. book marked it
But one question still...is it trying to hold the car at 14.7 afr? Is that the EPA requirement or something. What's the 14.7?
My ulterior motive to the questions is that I've been tuning my car but I dont have the input inot the tuning software at this moment I'm recording it using a dynojet wideband commander and watching the guage.
I made adjustments to the MAF table and rescaled my IFR and I think I got it pretty close.
It seems to hold around 14.7-14.9 while cruising at say 2500 rpms. It goes to about 12.5-13.3 at WOT and returns to 14.7-9. Cant really collaborate the data until I get the input taken care of but it's looking good I think?
But one question still...is it trying to hold the car at 14.7 afr? Is that the EPA requirement or something. What's the 14.7?
My ulterior motive to the questions is that I've been tuning my car but I dont have the input inot the tuning software at this moment I'm recording it using a dynojet wideband commander and watching the guage.
I made adjustments to the MAF table and rescaled my IFR and I think I got it pretty close.
It seems to hold around 14.7-14.9 while cruising at say 2500 rpms. It goes to about 12.5-13.3 at WOT and returns to 14.7-9. Cant really collaborate the data until I get the input taken care of but it's looking good I think?
Last edited by 99blancoSS; 09-10-2007 at 01:20 PM.