Stock 02 Z06. Changed wheel/tire combo from 18" wagon wheels with BFG DR's to 17" Z06 fronts w/ MT DR's. Best I had been able to do on the BFG's was 1.80 60'. Someone had recommend a shift to 17" and MTs for a little better grip. Struggling with the new tires now, I'm either bogging or spinning and can't find the sweet spot.

Any recommendation on air pressure, launch RPM, etc? I've run the pressure btwn 17 and 24 and launch rpms from 3K up to 4K. At this rate I'll have used up this set of tires trying all the different combos Would like to be able to get it to where I can do a very quick release, not quite a side step but close.

 

In a 363 rwhp Z06/M12/3.42/stock LS6 clutch, after 50 passes on stock tires and 250 on BFG 315.35.17 DR, I made 50 passes on MT Street Radials 275.40.17. They gave very consistent 60' once I figured out the burnout protocol.

I'd suggest that is your issue too...the burnout protocol.

With the MT Radials, this is what works:
(1) first pass of the day a good smoky burnout.
(2) all subsequent passes that day, spin the tires to just first whiffs of smoke and then back out of the throttle. Adjust the driver-side mirror to monitor the left tire smoke. MT technical calls this protocol "just hazing the tires."

If, instead of (2), you do another full smoky burnout, you bring oils to the tire surface that costs you .15-.20 on the 60' and some additional on the 1-2, 2-3.

The is a magic trick about the MT Radial; I have personally watched at least five C5Z06 owners set PR 60' the first day at the track after learning this trick.

FWIW, after a lot of experimentation, I found 20-22 psi hot produced the best 60', 330' and ET and trap for me. With my set-up (first para) I need 600-1000 more of a launch rpm than on the BFGs to permit a touch of wheel-spin on the launch. Any less and the MT Radials would bog. That is the benefit of a proper burnout protocol.

If it weren't for the finicky LS7 clutch and TM, I'd be doing those strong MT Radial launches on my C6Z and running some much faster times than 10.85. Oh well.

You also must be careful at the waterbox. More burnout and launch tips are at the links in my signature.





Ranger

 

Tks Ranger. Burnout may be a big part of this and probably why I've been frustrated as I adjust the launch. Appreciate you chiming in! I'll give it a try this next week and see if I can't get these times down some.