A pretty substantial voltage drop has been logged by a few members of the other forum. Not only at wot, but also in that 2500-2800rpm range right where the lean spot seems to happen. I believe the low spot is happening because the open loop and closed loop programs overlap for a slight moment, but there's not really a way to test that or fix that currently. For the top end though it is a common problem for "high" end cars that were designed with cost-effective engineering in mind. So many things are drawing alot of current and the system just maxes out. Once the system is maxed out, and the injectors, spark plugs, spill valve, ect... keep demanding more power, other things will be drawn short. One reason I think this could be the case is the temp. factor. The temp. sensors pass higher voltage to the ecu as the temps. go down. This would in turn cause a voltage drop (if this is the case) to occur sooner and more frequently than it would with warmer temps. Another thing that points in that direction is the whole tuning with an upgraded cdfp thing. With no active tune, the standback doesn't draw alot of current. However, once you start adjusting things, it will need more juice to do the things you want it to do. Thus, when you have the fuel physically capable of being there, the ecu keeps raising the amount of power being sent to the injectors, spark plugs, spill valve, ect... and then the standback is telling it to do this, that, and the other, you'll deffinately be demanding alot more from the system than it was originally designed to do. That would explain Dadasracecar's bad results and laloosh having to zero out his tune. This could be the root cause of the studdering issue, and the fuel cut, and the boost cut (whatever you mean by that). If our electrical system is actually sitting on the edge, then these "slight" things would cause such problems. Not 100% possitive, but it's worth looking into.
