Good morning everyone! I don't post too often because I can usually search and find what Im looking for but this one has me stumped! A client brought me a 2nd gen TA with a single plane intake on a built LS3. It had a corvette OS and during tuning, on startup, it would go into RAP. I found out he was using an 87mm truck TB to make the shaker hood fit and the throttle stops must be different between the LS3 tb and truck causing RAP. So I changed to a 2012 Silverado OS that used the same TB and the issue was solved. However now I'm left with a new issue where the car seems to go into reduced power past a certain throttle angle or amount of airflow. I have tested with a known good tb and it did not change anything. I noticed in the earlier logs where it was lean I could go full wot without it going into reduced power but after adding fuel to the ve map in the wot areas it began going into reduced power.
I brought all my idle and other data from the vette tune but kept the truck tb settings. The cars starts, idles, and drives very well all the way to about 60% throttle at which point it shoots lean then goes into what appears to be RAP (throttle is dead) with no dtc other than sometimes Ive seen a p0606? A battery disconnect or clicking clear dtc's in the scanner brings it back to normal. Ive logged air, fuel and spark torque management source pids during the events and all read NONE. I believe I have done the RPM zones correctly but this is the first time Ive tried running VVE to redline so maybe Ive done something wrong. I can see in the logs where the delivered torque will shoot down if I irritate it some but not enough to go dead. Id appreciate any info or help you can give. Ive had to send the car home but will have it back in a week or so to do more diagnostics.