So I was wondering, which cheater tire is better to run on the GT cars the Hoosier A7 or the Hoosier R7? I've only run the R7s before and never tried running the A7s. What's the difference between the two tires in terms of grip and fall off of grip with HCs? Curious to hear from you guys...

 

A7's should come up to temp quicker but won't last as long as R7. In hot temps, I would go with R7's.

Which car are you going to run these on?

 

Martin,

Still trying to win your DE. A7 are more of a TT tire, 2 or 3 laps and come in. R7 take a little longer to come in and don’t have the Hero lap like an A7 but over a 30 min session they hold up and wear better.

Peter

 

Hes chasing the dragon again.

 

Go straight to slicks. I won’t run Hoosier until they fix the quality and stop them rotating 180 degrees every session.
Same everything and no problem with (Used) Pirelli.

The N2 Michelin’s seems to last a bit longer, but not 4 days.
I will try Dunlop Max 2 next to try and make them last 4 days.

 

20" Hoosier R7's have served me well. If you stay out most of the session, R7's will last longer.

You must rotate tires from side to side and flip on the rim occasionally to get the longest life out of them.

Best Regards,
Dave

 

From what's been said here it seems like the Hoosiers are a (poor) intermediate step between street tires and a full slick. If one can overcome the hassles of getting a Pirelli DH mounted at or near the track, go that route. Once you do going to anything else will be challenging and a let down. Ask me how I know.

 

Would be going on a 2,700 lbs 987.2 Cayman S track car.

 

We were running A7s on these. They don’t last quite as long as R7s but don’t fall off as precipitously as they see continued cycles. They are a slightly softer compound.

My son wants to go back to R7s but I want to stay with the A7s.

Go A7 see if you like it. It won’t last quite as long but won’t fall off like an R7 as it wears. You can always go back to the R7

 

Gotta win the DE Cup man, every little bit counts. haha

I really didn't want to go down the slicks....but I may be willing to have a little taste of used Pirelli slicks. I just want a little taste.

Where's the best place to buy Pirelli DH slicks (new and/or used)? What sizes would I get if I'm running 245/35/18 front and 275/35/18 rear now?

 

Good point, maybe give the A7s a try and see how I like them. I've noticed that the R7s really start dropping offer after 7-8 HCs but can handle 14-15 HCs before cording.

 

When running slicks (or Hoosiers) did you upgrade the suspension/frame? IIRC owners manual says to stick with street tires.

 

A7 is an autocross tire. It will pull the same Gs when hot, and super hot and greasy. Your slip angle will get bigger by a lot when super hot, and you will leave a lot of rubber on the track. Autocross is all about changing directions very quickly and at our local venue some clubs used to run a 90+ second course. A7s in July could not handle it. About 75 seconds in I would start creaming cones like crazy. I would get 8 events before cording the tires. Around 75 seconds the car would not turn and tires just melted and scrubbed away. No way could I turn the wheel fast enough or far enough, car would not respond. Bleeding air from them would make your hand very uncomfortable from the heat. I switched to R7s for those events and did a whole lot better.

 

You should look into BF Goodrich R1-S. They last longer than a Hoosier and I found them to be as fast maybe faster than a R7, and they are slightly cheaper too. I used to run them on my 987.2 Cayman as well.

 

just buy a GT3RSR
run Michelin blues
stop messing with amateur stuff martin