Peter knows a what he is talking about (I used to have one of his RX-7s), so his advice is probably good. If you are not worried about the handling problems, you should go with the bias ply slicks,as they will definately hook up a little better than even the best DOT approved drag radial. I'm sorry, but I don't have back-to-back comparisons on the same car with slicks vs drag radials. I do know that one of my friends with a very high hp Supra cut several tenths off of his time switching to slicks, but as I stated in the earlier post, he was losing traction on launch, the1-2 shift and the 2-3 shift, so there was a lot of room for improvement.
I honestly don't know off hand if 15" rims will fit over your brakes. I would suggest you measure the clearence you have now between the outside of the calipers and the inside of your current rims. My guess is that it won't quite work, but it's only a guess.
I haven't had my car at the track in its latest configuration, as we have spent four weeks chasing an unbelievably pesky electrical glitch in the Motec M48 harness, but I think we isolated it this afternoon. I am also working with Aerodyne to modify my turbos to provide more boost, and if they can do it, that will cause another short delay. Bob Norwood is doing the tuning. According to the math, it should be putting 440-460 hp to the wheels before the NOS shot. MecTech has a slighlty less modified car that is making those numbers, so I am pretty confident we will hit them. As soon as I can get it tuned and through the quarter mile, I will post the times.
In its previous iteration, with 340 hp at the wheels and street tires, I was running low 12s, but had really bad 60 ft. times. The car floated all over the place on hard launches. Now that if have 18x12s on the back and 100 more hp, I expect that to improve considerably.
