Hello all, my truck was tuned about a month ago and at that time I had not installed the long tubes with high flow exhaust. the following logs are post the LT HFE install. If someone could walk me through the changes that may need to be made, or give me some direction would be greatly appreciated.
post your tune so we can see it, and help with the changes neededOriginally Posted by GMTECH704
Based on your WBO2, it looks to me like you need to add 3 to 5% starting at 4000 rpm, 90 kpa and up. Post your .HPT file also and lets look at the VE table.
Are you referring to 3-5% 0n fuel or air?
Here is what you asked for.
Your running lean around the 4,000 rpm point due to the additional flow you received from the exhaust upgrade, which means you need to add fuel to take advantage of the additional airflow. You do this in the VE table and you may need to re-visit the MAF below the PE (power enrichment point).
VE CHANGE.png
Thank you for all your help. I will make these changes and log and get back with you
Should I also go into the MAF calibration and add from 8500 hz and up. I am looking at this log were at WOT it commands 11.80 and I'm showing 12.7
From 8500 hrz and above my commanded AFR is 11.8, however I'm only showing that I'm running 12.5.
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