We are in the finishing stages of an R2.8 swap using a 6l80E. The engine generally runs well once the turbo spools up. There is no power until we hit about 1200RPM. Below that there is only black smoke and a lot of lag. This occurs both when starting from a stand still and any time the RPM drop below 1000. For example cruising down hill will the engine just above idle with my foot off the pedal. when I go to apply the pedal the engine stumbles and smokes until it gets up to boost. The 6l80E came from the folks at zero gravity and has a stall set at 2500. Generally once it gets moving it really pulls.
Any thoughts?
Any thoughts?