The title pretty much explains the problem. What we have here is a Dart block, 588 cubic inch engine. 2 67mm precision turbos. I am nearing 400whp and 600wtq at 7psi. What is happening is that the Electronic Throttle is closing from 100% to around 70% at about 4000RPMS at WOT which causes an unwanted loss in power. My concern is that it is a VCM limitation because the Max Torque value in the tune file cannot be set higher than 640. Any thoughts or suggestions are appreciated.
LOG:
588tt-lost throttle.hpl
Tune:
2006 Chevy 2500HD 588_006.hpt