[Excaliber]

Yeah TA's are SO worthless at the track, even a decent set of street tires would show improvement, let alone slicks!

Tire spin on BOTH rear tires or one? I assume you have the open differential?

I've heard it said several times the BDR's get decent wheel spin on both sides in spite of the open diff. This would indicate a stiff chassis not 'twisting' or 'raising' the car to one side. Thus putting more weight on one wheel, less on the other, as is typical with most cars. Chassis twist in general is pretty limited on most all replicas, short wheel base being the primary factor I would think.

The 'Drag Race' calculators are not very good UNLESS your car is seriously set up for drag racing. You'll find the numbers you actually run compared to the numbers the software says you SHOULD run to be very disappointing. The calculator assumes several things most of don't have. Good traction for one, which includes not only slicks but 'weight transfer'. Cobra suspension, even BDR's, just don't give you good transfer on accelleration. The suspension is designed around 'road course' type stuff, not drag racing, and the short wheel base doesn't help.