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Old 07-07-2014, 08:59 AM   #52
Norm Peterson
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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, 09:22 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, 11:54 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 . . .


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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, 12:29 PM   #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, 12:33 PM   #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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Old 07-07-2014, 01:02 PM   #57
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I have found that a hand gauge and the DIC are very close. If they are within 1/2 lb then that's fine for 20 to 40lbs. Need closer for low 5 to 20 lbs.
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Old 07-07-2014, 02:57 PM   #58
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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...
If your running consistent lap to lap and session to session the tire temps should be stabilizing within +/- a pound each run. Of course significant changes in the weather will effect that, but once your tires reach operating temp, say 130*(after a lap or two) they should stay at that temp and corresponding pressure.

For example I set my tires at 26 when I get to the track, after a couple warm up laps I hit it hard for 20-30 minutes. It usually puts me around 33 psi. I will adjust if needed for the given conditions that day, but after that first run I'm usually set for the rest of the day.

I guess I'm just wondering why it needs monitoring during the session. Unless it's just curiosity cause I understand that too.
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Old 07-07-2014, 03:31 PM   #59
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If your running consistent lap to lap and session to session the tire temps should be stabilizing within +/- a pound each run. Of course significant changes in the weather will effect that, but once your tires reach operating temp, say 130*(after a lap or two) they should stay at that temp and corresponding pressure.

For example I set my tires at 26 when I get to the track, after a couple warm up laps I hit it hard for 20-30 minutes. It usually puts me around 33 psi. I will adjust if needed for the given conditions that day, but after that first run I'm usually set for the rest of the day.

I guess I'm just wondering why it needs monitoring during the session. Unless it's just curiosity cause I understand that too.
First, I'd never run at Thunderhill before my recent weekend there. Second, we had multiple runs over the course of the day (four, I think) so the variation in ambient between morning and afternoon was substantial. Third, I'm learning the car and the tire, and was unsure where I'd need to start to end up in the 32-34 range given the high temp of 106 degrees. Fourth, Pirelli claim the optimal pressure for this tire is 2 bar/30 psi. I was trying to find the optimal tire pressure window but I didn't buy the 30 psi scenario on a car with the weight of the Z/28.

After driving at Thunderhill, I believe the sweet spot is 32-34 psi. There was a tire expert, Guy Gamba, who was at the track measuring tread temps and pressures. He knows the Trofeo R very well, and thought the optimal pressure was 32 psi. I'm a little less positive about that, as his guys waited about 8-10 minutes -- after I was parked at their temporary "shop" -- to check temps and pressures...
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Old 07-07-2014, 03:51 PM   #60
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First, I'd never run at Thunderhill before my recent weekend there. Second, we had multiple runs over the course of the day (four, I think) so the variation in ambient between morning and afternoon was substantial. Third, I'm learning the car and the tire, and was unsure where I'd need to start to end up in the 32-34 range given the high temp of 106 degrees. Fourth, Pirelli claim the optimal pressure for this tire is 2 bar/30 psi. I was trying to find the optimal tire pressure window but I didn't buy the 30 psi scenario on a car with the weight of the Z/28.

After driving at Thunderhill, I believe the sweet spot is 32-34 psi. There was a tire expert, Guy Gamba, who was at the track measuring tread temps and pressures. He knows the Trofeo R very well, and thought the optimal pressure was 32 psi. I'm a little less positive about that, as his guys waited about 8-10 minutes -- after I was parked at their temporary "shop" -- to check temps and pressures...
No problems, just curious. It's cool you had access to a tire specialist.
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Old 07-07-2014, 03:56 PM   #61
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No problems, just curious. It's cool you had access to a tire specialist.
Sure thing, and I didn't have a problem with your question (just trying to be thorough). The biggest issue was the temperature; that was new territory for me!

I agree; having the tire specialist there is great and Guy Gamba has forgotten more about tires than most of us know...
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Old 07-07-2014, 04:02 PM   #62
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Sure thing, and I didn't have a problem with your question (just trying to be thorough). The biggest issue was the temperature; that was new territory for me!

I agree; having the tire specialist there is great and Guy Gamba has forgotten more about tires than most of us know...
Cool, hope you get it all hammered out and start tearing up the track. Glad I don't have to deal with temps over the 90's
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Old 07-07-2014, 04:54 PM   #63
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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.
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I'd say it's within 1/2 a pound, based on my readings.
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I have found that a hand gauge and the DIC are very close.
Even for such a small sample size, that's damn good consistency. Way better than I expected.


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Old 07-07-2014, 05:08 PM   #64
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Cool, hope you get it all hammered out and start tearing up the track. Glad I don't have to deal with temps over the 90's
Sadly, we were literally tearing up the track. We were the first group (Hooked On Driving) to run the new 5-mile circuit, and the track started breaking up in several areas, due to the high temps!
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Old 07-12-2014, 02:24 PM   #65
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I put my new wheels and tires on, the car is smoother. But does not seem to want to follow ruts like it did. Also the does not seem to have the quick cornering like before. Seems like the side walls are not as stiff? I used the S-04s
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Old 07-12-2014, 02:37 PM   #66
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I put my new wheels and tires on, the car is smoother. But does not seem to want to follow ruts like it did. Also the does not seem to have the quick cornering like before. Seems like the side walls are not as stiff? I used the S-04s
I think the S-04s are great street tires, in that they do not "hunt" or track pavement irregularities like the Trofeos. They are also run far quieter and are more comfortable. The S-04 sidewalls have more flex than the Trofeos, for sure, and the tires aren't nearly as grippy.
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Old 07-12-2014, 02:57 PM   #67
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I just caught back up to this thread. brt3 hit all the points spot on.

1. Readout is perfectly easy to see in any light condition.
2. The tracks I run at can see an ambient swing of 30-40f through the day, for example 55f in the am, 95f in the last session, so I wind up bleeding tire psi throughout the day.
3. Too high psi (approx 36+psi) in the Trofeos will make them greasy and wear out the center in short order. Most psi critical tire I've ever seen in a street tire, but then again it is true race rubber.
4. My TPMS reads .8 psi low vs my Longacre Racing gauge, once I found the differential, that's all I needed to know.
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Old 07-12-2014, 03:07 PM   #68
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I just caught back up to this thread. brt3 hit all the points spot on.

1. Readout is perfectly easy to see in any light condition.
2. The tracks I run at can see an ambient swing of 30-40f through the day, for example 55f in the am, 95f in the last session, so I wind up bleeding tire psi throughout the day.
3. Too high psi (approx 36+psi) in the Trofeos will make them greasy and wear out the center in short order. Most psi critical tire I've ever seen in a street tire, but then again it is true race rubber.
4. My TPMS reads .8 psi low vs my Longacre Racing gauge, once I found the differential, that's all I needed to know.
The DIC may not be off as much as you think, I found if on 32lbs and you let air out it will show 32 even at 32.10. Also it takes time for the TPMS to change the DIC.
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