Kevin Doe
May 20th, 2009, 11:00 PM
I have noticed over the years that when I start my car, it runs very lean compared to commanded for a short while. Then it seems to fall into a BEN of ~0.98-1.00. I command 14.65 AFR in my idle cells. I have tuned the start such that I get a perfect start with minimal rpm flare. It starts very quickly, hot or cold w/o touching the gas pedal.
Now, for some reason it starts and runs in the 16-17 AFR range for like 2-3 minutes after I start it, if I just let it idle to warm up. Once its warm up, my AFRs are perfect. It doesn't have to do with the IAT, as I'm on COS3 and I've tuned the A0014 table pretty extensively and it seems to do a pretty good job.
Does this point to a deficiency in the IAT/ECT temperature blending for my engine? I do not have the coolant lines routed through my throttle body like normal, and my intake system differs significantly from stock (its a dual ramhorn looking 3.5" intake system going to two seperate cone filters behind big openings in the bumper cover.
Anyone care to point me into the right direction?
Now, for some reason it starts and runs in the 16-17 AFR range for like 2-3 minutes after I start it, if I just let it idle to warm up. Once its warm up, my AFRs are perfect. It doesn't have to do with the IAT, as I'm on COS3 and I've tuned the A0014 table pretty extensively and it seems to do a pretty good job.
Does this point to a deficiency in the IAT/ECT temperature blending for my engine? I do not have the coolant lines routed through my throttle body like normal, and my intake system differs significantly from stock (its a dual ramhorn looking 3.5" intake system going to two seperate cone filters behind big openings in the bumper cover.
Anyone care to point me into the right direction?