my car is a similar "test"..my engine trans and rear, and 95% of my suspension were originally in a 92lx convertible, with a little weight removed..think it was right around 3500 with me and a full tank of gas...i swapped all that stuff into my notchback which is pretty much gutted, and weighs 2810 with me and a full tank..so about 700lbs difference...the vert ran a best of 12.71 @ 106, and the notch had run a best of 11.94 @ 112...so the .1 for every 100lbs removed seems to hold true in my case