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Old 07-06-2014, 11:06 AM   #43
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Oh Lordy. That radial cut is what it looks like, a cut. Don't know what he ran over, but he ran over something. There is no radial seam in a tire.

That "delam" on the side is because he did not race correctly. Modern tires use 2 kinds of rubber. What you see is the sticky rubber tread vs the hard rubber base. True for all true street tires.

Looks like folk on that site hate BFG's for some reason.

I'm not brand loyal though when it comes to tires, I've run a lot of tires, on a lot of vehicles, in many different kinds of competition.

I'm no expert. I'm a hobby racer with a lot seat time. If My Car Ever Arrives, I'll run the Rival 18's and see what's up. Trofeo's (illegal) vs. Rivals (Legal).
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Old 07-06-2014, 11:08 AM   #44
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Actually almost everyone on the site runs bfg's. I plan to watch the thread to see its outcome


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Old 07-06-2014, 11:37 AM   #45
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I've seen that line on bias tires (on an angle, and I went over 200mph with that line), but not radials yet. So I may be ignorant. But I don't think that's delam.

I will try and hunt up my Delam of Death video to show what delam does. There is also a "chunking" video. I sent tires to Standard Testing Labs, Inc, to verify tires before Bonneville. The Delam Radial video is great. The tire exploded on the testing machine.

Unless somebody is Chunking (pieces of tread rubber rip off), I would not worry.

I see the same side block line on the Volt's Rivals passenger side. But I looped the car at over 60mph, a full rev and half. It tore into the side block and shows the line between the two compounds.

I will admit I've only ran a dozen or so BFG race tires. I have more experience with other brands.

Like I said, I'm a Professional Amateur. I've wrecked a LOT of tires on a lot of vehicles. Mostly because I suck.

But what I saw in that thread would not worry me. I've seen it before with the side blocks, but never on the tread of a street tires. I have seen that with a bias tire, but after calling Mickey Thompson's race engineer, I ran with it with no problems.
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Old 07-06-2014, 02:17 PM   #46
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I'm interested to know. My old 2011 ram 1500 learned two different sets. I had stockers I ran in winter and 22s in the summer. I could swap tires all around the truck or back and forth to summer to winters and it knew exactly was going on all the time. Never had to relearn. Wonder if the Maro is the same
What happens if you rotate them? Yes if the sensor is cloned, then you just swap and no big deal. But our owners manual says if we change sensors we have to learn the sensor.
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Old 07-06-2014, 02:28 PM   #47
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My car is white and white is always supposed to hide dirt better but after washing her I take a speed run to dry and in 2 miles she is dirty again back on the lower door and rear fenders.

Hopefully Skylane is working on a kit to run these http://goo.gl/JvHUrj
Wheres the logic in that? White does "NOT" hide dirt better its the fastest color to show dirt...Mid colors are better dirt camouflage , gun metal grey etc.....
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Old 07-06-2014, 02:29 PM   #48
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Yes a sensor can be cloned, but you need the number off the one that's in the tire you are changing. I do not want to break all the tires down. So I will just lure the new tire. It takes a more costly coning tool to do it. It's good for shops to do it, because it takes less time to clone than learn.
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Old 07-06-2014, 05:18 PM   #49
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brt - thanks for the tire review...

As far as TPMS on a track day tire & wheel setup goes - does anybody really pay attention to the TPMS when they're out there on the track at speed? You aren't likely to hear any little beep with a full-face helmet on and the windows open at 100+ mph or at WOT in the lower gears.
When I'm on-track I'm alternating between oil temp & pressure and TPMS. The Trofeo Rs have a fairly narrow window, regarding optimal pressure, and running in high temperatures makes it very hard to get this just right. The "do not exceed" pressure is 34, and optimal is 32. So, yes -- I often have the TPMS screen up when I'm on the track...
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Old 07-06-2014, 07:50 PM   #50
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When I'm on-track I'm alternating between oil temp & pressure and TPMS. The Trofeo Rs have a fairly narrow window, regarding optimal pressure, and running in high temperatures makes it very hard to get this just right. The "do not exceed" pressure is 34, and optimal is 32. So, yes -- I often have the TPMS screen up when I'm on the track...


Ditto for me

Tire temp on TPMS is the primary thing I watch when on track. Too high psi, I end the session. Oil temp I watch for curiosity knowing I'm going to get two indications (A/C cutoff, then a warning light) if it gets hot.
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Old 07-06-2014, 08:14 PM   #51
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When I'm on-track I'm alternating between oil temp & pressure and TPMS. The Trofeo Rs have a fairly narrow window, regarding optimal pressure, and running in high temperatures makes it very hard to get this just right. The "do not exceed" pressure is 34, and optimal is 32. So, yes -- I often have the TPMS screen up when I'm on the track...
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Ditto for me

Tire temp on TPMS is the primary thing I watch when on track. Too high psi, I end the session. Oil temp I watch for curiosity knowing I'm going to get two indications (A/C cutoff, then a warning light) if it gets hot.
Interesting. Do you guys commonly have large differences in tire pressures, session to session? What happens when you exceed 34 psi?
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Old 07-07-2014, 07:59 AM   #52
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I guess I have to assume that the TPMS pressure display really is sufficiently readable under at least some bright daylight conditions (the message panel on my car is not good enough for track driving use, even if I'm not wearing sunglasses, never mind that it doesn't feature an individual tire pressure display screen).

How accurate are the numbers it displays? Have people checked all of them against their own pressure gauges for a range of pressures? Pressure transducers are still mechanical in nature and thus subject to tolerances affecting accuracy . . .


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Old 07-07-2014, 08:22 AM   #53
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Wheres the logic in that? White does "NOT" hide dirt better its the fastest color to show dirt...Mid colors are better dirt camouflage , gun metal grey etc.....

you are right...I should have said better than the last 2 fast black cars I've had.
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Old 07-07-2014, 10:54 AM   #54
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I guess I have to assume that the TPMS pressure display really is sufficiently readable under at least some bright daylight conditions (the message panel on my car is not good enough for track driving use, even if I'm not wearing sunglasses, never mind that it doesn't feature an individual tire pressure display screen).

How accurate are the numbers it displays? Have people checked all of them against their own pressure gauges for a range of pressures? Pressure transducers are still mechanical in nature and thus subject to tolerances affecting accuracy . . .


Norm
It's easily readable and has pressures for each tire on one screen. The numbers seem to be accurate to the mechanical gauge I have by +/- a pound. I don't use the tire display and prefer an actual gauge when working with tire pressures at the track. For me it's just easier, if a small adjustment is needed, I'm right there by the valve stem and I don't have to worry about tolerance differences from sensor to sensor.
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Old 07-07-2014, 11:29 AM   #55
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I guess I have to assume that the TPMS pressure display really is sufficiently readable under at least some bright daylight conditions ...
Yes; it's very bright and easily readable at a quick glance...

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How accurate are the numbers it displays?
I'd say it's within 1/2 a pound, based on my readings. I always cross-check pressures with a digital gauge that reads to .1 psi, and the TPMS readout always seemed close to those measurements...
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Old 07-07-2014, 11:33 AM   #56
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Interesting. Do you guys commonly have large differences in tire pressures, session to session? What happens when you exceed 34 psi?
The car starts to feel a touch loose and greasy, IMHO, and you really start to feel this at 36 psi.

I'll ask Zfat to confirm this, but I think -- in the high temps of Thunderhill -- that 27 psi cold resulted in 33 psi hot. Quite the swing, and one reason the TPMS readout is a handy tool...
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