I have run Nitto 420S tires for 30,000km now and one trip to the Dragon where I pull 16:00s and I don't get that kind of wear. 34psi hot. 2007 Ford Edge, stock. No tire warmers, hundreds of heat cycles.
Also cute. What's the problem? You think we are comparing apples to oranges here? And then a follow up, why run tires that have 10 to 50 heat cycles and poor wear if one doesn't need them and lap times could be imporved elsewhere? The right set up of street tires will get you further than fiddling with different tires. The difference between PC3s, PCRs, MP1s, DQ2s is minimal, barring profile and minor longetivity issues. We aren't comparing slicks to street tires here. On top of that, a 600cc at TMP should be pulling better times than a 1L, with less torque and stress on the rear. I can see if the OP was reaching the longevity limits of the MP1s after 2 track days if he was pulling sub 1:19s, maybe down to the 1:17s, but come on.
What I am suggesting is that these tires can take far more heat cycles and still give 1:26 performance comfortably, without tire warmers, and in addition to riding on the street, inclussive of temps below 5 degrees.
You honestly entertain the notion that street/track tires are losing significant grip after 2 track days? What kind of garbage tires / and or set up is falling off that fast running 1:28 at TMP?
Another poster was right about putting too much weight on the bars, incorrect tire pressures, and what appears to me to be too soft a set up at the rear. Another poster was right...start with sag, then go from there...comp, rebound (on manufacturer suggested PSI levels). Then fiddle with PSI drops in every session until you're comfy with the performance. Sessions at the end of the day tend to suffer from fatigue of the body and mind rather than the tires, and I tend to agree with the poster who suggested the weight transfer issue
There are tons of track riders out there, shredding the crap out of their tires and getting no substantial increase in lap time improvement, but they swear to themselves they are really getting the most out of their tires because they "look" like a set of MotoGP take offs. If your tire looks like a GP take off, and you aren't anywhere near the *** end of a novice racer's pace, then your suspension isn't set up right, and don't blame the tire.
And shredding the left side of a tire at TMP?!?!?!?!?! Really?!?!?! I can see if you had some cold tearing at the tread, but not shredding.
MP1's may have substantial drop off after a few heat cycles, but not noticible by someone 10 seconds off the pace of a novice racer at TMP. Something else is wrong.
Oh wait...let's go with the generic advice...those tires are mangled take offs. Sell them off to some chump and get new slicks and new springs (with the $200 said chump will poney up) to get the OP to 1:25...yeah go with the upgrades.
