Originally Posted by
essmotorsports
So you have a very similar setup to me, and people might disagree... I've been down the same exact road you are going down and basically you are tying too hard. The best advice I got lately is to put the VVE back to stock, put MAF curve back to stock and tune roughly from 5000ish hertz and up. This is what I have done, and it brought my part throttle fuel trims right in line, and car runs better than when I was trying to adjust the VVE. With car being torque biased adding the airflow down low makes torque management very intrusive, especially without adjusting VTT. Fuel trims being spot on tells you your fueling is good, since the wideband is really better at WOT.
Put you manifold volume to stock. You will have to adjust your Map Virtual torque table. Increase 100 kpa line to roughly the torque your engine is making at the corresponding spark at WOT. I increased mine another 40/50 ft/lbs and then interpolate to the lower 20kpa line. This made the car run so good, and shift sooooo much better. Torque management is not nearly as intrusive now.
My issue was always running way too rich, so if you have lean spikes I would verify your install of the LT2 is correct. Watch my video on youtube to show you the steps I took. There is a little alignment knob that has to be ground down for it to sit on the heads right. Also the foam piece can mess with you.