Kuhmo v-710 for HPDE
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Is it realistic to expect 40 heat cycles out of the Kuhmo V-710s.Posts all over the mat from 15 hCs to 20 TRACK HOURS.What is your experience with them ?Do they last significantly longer than the Hoosiers?Thanks HOM
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So what type of format where you running in HPDE 20-30 min sessions?Did you have them heat cycled before you ran them ?Did they have any grip left and where they going away slowly or just completely done and hopeless .Thanks so much for your input HOM!!!
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So what type of format where you running in HPDE 20-30 min sessions?Did you have them heat cycled before you ran them ?Did they have any grip left and where they going away slowly or just completely done and hopeless .Thanks so much for your input HOM!!!
I change tires when grip is borderline... gone.
I've done both... had TireRack heat cycle them and heat cycled them myself.
Tire size 315 x 18 all wheels. I do flip them... side to side/front to back.
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I'm not that low in the front, about 93mm off Porsche's measuring points up front, 110 in the rear. It appears lower in my avatar photo because I'm hard on the brakes at about 150 and my splitter which is angled downwards. Cups are 85 mm front, 115-120 rear.
As for tires, I run Yokohama slicks. 250/650/18 front, 280/650/18 rear. They
are allegedly comiing out the larger cup car sizes this year, 250/640 front and 305/680 rears. If so I'll swtch to the lower profile fronts but not the rears as they work best for me. I run about -3.7 front, -3.2 rear.
Car is a 99'- 996 with 3.6 bottom end and 3.4 heads, cams, cable TB, and 5.2 DME.
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Jr,93 is pretty low if I remember correctly !Car looks nicely sorted what splitter is that on the front looks bigger than the cup splitter to me but maybe not!How did you wind up with the 3.6 pieces in the the 3.4 ?Is that an 02 fender set on the car?Do you have an idea of what it weighs?
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HOM, as you've gone faster in recent years, I think you'll find that the number of heat cycles before traction falloff is going to be a lot less than it used to be.
For example, for guys like Jim Lewis, now doing 2:08-2:10 in his 996 GT3 (since replaced by the GT2), he was at 20-24 cycles (and I define one cycle as reaching operating temperature or 160 degrees minimum) at 2:14-2:17 laps, 16-20 cycles doing 2:12-2:14 laps, 12-16 cycles doing 2:11-2:12 laps and 8-12 cycles at 2:10 or under.
For example, for guys like Jim Lewis, now doing 2:08-2:10 in his 996 GT3 (since replaced by the GT2), he was at 20-24 cycles (and I define one cycle as reaching operating temperature or 160 degrees minimum) at 2:14-2:17 laps, 16-20 cycles doing 2:12-2:14 laps, 12-16 cycles doing 2:11-2:12 laps and 8-12 cycles at 2:10 or under.
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Peter,That makes perfect sense to me!Am trying to get the most out of the cubic dollars I spend .I wonder if there's still a lot to be learned from an R compound that's at the far end of its life?Further if people are tossing them prematurely so they won't appear slow!You know what a weenie I am,cheers HOM
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You sir, are NOT a weenie!
But yes, the car drives terribly when it falls off the traction cliff... Nothing to be learned.
But yes, the car drives terribly when it falls off the traction cliff... Nothing to be learned.
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What's weird is that for my car for a thousand bucks you can get the Nittos which are at least quicker than streets ?Grip goes straight up from there price wise and the more grip you get the shorter they last .There just doesn't seem to be a sweet spot in the whole R compound /slick group at least I'm still looking for it!And would like to find it! Cheers HOM
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Jr,93 is pretty low if I remember correctly !Car looks nicely sorted what splitter is that on the front looks bigger than the cup splitter to me but maybe not!How did you wind up with the 3.6 pieces in the the 3.4 ?Is that an 02 fender set on the car?Do you have an idea of what it weighs?![hiha](https://rennlist.com/forums/graemlins/roflmao.gif)
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3.4 and 3.6 are basically the same bottom end just different crank, carriers, rods, and pistons. Putting a real 3.6 with Variocam Plus into a 99' car requires the latter ECU, wiring harness, immobolizer, gas pedal, fuel pump, and more. It's a lot of work. Using the 3.4 heads, cams, TB nothing changes. It's plug-n-play and I gained an additional 30 RWHP, 272 to 304 on a Dyno Dynamics dyno, probably 320(+/-) on a DynoJet. I didn't even reflash it, it runs GIAC's "street" flash for 91 octane.
My car weighs 2450 on fumes, I know of another 99' that's about 50 lbs. lighter.....