Cylinder Charge Temperature for FI
#1
Thread Starter
TECH Senior Member
iTrader: (5)
Joined: Dec 2010
Posts: 5,235
Likes: 4
From: Las Vegas, NV
Are you boosted guys disabling the charge temp table so the fueling calculations are only based on the IAT. Basically turning the IAT into an MAT sensor?
Kind of getting annoyed with lean starts and was wondering if disabling that table will hurt anything else in the tune. Thanks guys
Kind of getting annoyed with lean starts and was wondering if disabling that table will hurt anything else in the tune. Thanks guys
#3
Thread Starter
TECH Senior Member
iTrader: (5)
Joined: Dec 2010
Posts: 5,235
Likes: 4
From: Las Vegas, NV
Just for the hell of it, I changed the bias table to see how it would react. Blindly, I set the first value (low airflow) to 1.20 and then set the last value (high airflow) to .800. Then interpolated between the two. Started the truck and it was a lot leaner than before. So look like the more it is biased toward ECT, the leaner it gets. So next I just disabled the table, making the IAT the only sensor used, and it idled around .90 lambda until the STFT's kicked in.
WOT fueling is still the same with the charge temp table being disabled. So since my IAT is right before the tb, is there any downside to leaving the table disabled and retuning my idle and part throttle cells in the VE?
WOT fueling is still the same with the charge temp table being disabled. So since my IAT is right before the tb, is there any downside to leaving the table disabled and retuning my idle and part throttle cells in the VE?
#4
I still use mine. I had initially mounted my IAT in the intake as close to the runner as possible. I kept having problems with heat soak. I later learned that the IAT is blended with the ECT to determine the temp when the air is entering the cylinder. I have since decided to mount the IAT as far down stream as possible. I have mine mounted right after the intercooler(if I was NA I would mount it right after the filter). I think the fact that my intake is aluminum, and gets extremely hot that it was causing the problem. At lower RPM's the air is moving through the heated intake slower picking up much more heat than it would if the intake was composite. The solution for this was for me to blend more in favor of the ECT when the RPM's are lower.
Trending Topics
Thread
Thread Starter
Forum
Replies
Last Post
carid
Sponsor's Announcements, Sales, and Specials
0
Oct 1, 2015 09:22 AM







that's pretty damn funny
