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ZL1 Wheels/Tires Wheels and tires discussion for ZL1

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Old 11-03-2012, 09:36 PM   #1
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Which tire pressure gauge to trust?

My DIC says the front tires are 28# and the rears are 33#. My little hand held dial gauge say the fronts are 33# and the rears are 37#. Anybody got any info on which might be more accurate, and does it matter that the fronts are a little less than the rears?
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Old 11-03-2012, 09:48 PM   #2
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They should all be at 35 psi.
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Old 11-03-2012, 09:56 PM   #3
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Check them after car sets over night in the morning. I went through this shit for a week. LOL Set them at 36 (SS) ? (ZL1) reset the dic and drive a few miles. Your dic will show higher numbers as the tires get hotter from driving. Again check them in the morning if your car is in a garage. Hope this helps man... Go to Advance and get a digital gauge. Get a good one.
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Old 11-04-2012, 08:35 PM   #4
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I use a digital accugauge and my DIC is only off about 1 PSI on one tire. I run 32 in them.
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Old 11-04-2012, 09:53 PM   #5
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They should all be at 35 psi.

32 is recommended
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Old 11-04-2012, 09:59 PM   #6
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According to the owners manual, they should all be at 36psi cold.... I noticed my manual tire gauge was always about 5psi off from the DIC. Got a new manual gauge, and it matched. I now go with the DIC (had some big issues after rims changed, and after going through deep standing water.... now resolved, but I was testing it a LOT during that timeframe.)
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Old 11-04-2012, 10:20 PM   #7
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According to the owners manual, they should all be at 36psi cold.... I noticed my manual tire gauge was always about 5psi off from the DIC. Got a new manual gauge, and it matched. I now go with the DIC (had some big issues after rims changed, and after going through deep standing water.... now resolved, but I was testing it a LOT during that timeframe.)

That's for the SS, the ZL1 is different ... Should be 32 cold
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Old 11-04-2012, 10:48 PM   #8
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I'd trust the handheld gauge more than the DIC. My handheld gauge is always about 3-4 psi more.
I think GM intentionally shows a lower psi on the DIC. This makes owners pump up their tires way before the tires are dangerously underinflated.
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Old 11-05-2012, 10:30 AM   #9
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I'd trust a good hand-held gauge more . . .

Short of that, at least use the same gauge whenever you re-inflate the tires and don't be too afraid to experiment with slightly higher or even lower indicated pressures (since you won't know if your hand-held reads high or low unless you go get it calibrated somehow).

Don't be afraid to try a little stagger in your pressures either. A little more pressure in the fronts (2 or 3 psi) will make the car respond a little more crisply to steering wheel inputs, and setting the rears to a little less than the fronts gives them a little more margin against the car's tail "going loose" under a little too much throttle on corner exit. You might find that you prefer the car's handling behavior that way.


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Old 11-05-2012, 11:00 AM   #10
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I'd trust a good hand-held gauge more . . .

Short of that, at least use the same gauge whenever you re-inflate the tires and don't be too afraid to experiment with slightly higher or even lower indicated pressures (since you won't know if your hand-held reads high or low unless you go get it calibrated somehow).

Don't be afraid to try a little stagger in your pressures either. A little more pressure in the fronts (2 or 3 psi) will make the car respond a little more crisply to steering wheel inputs, and setting the rears to a little less than the fronts gives them a little more margin against the car's tail "going loose" under a little too much throttle on corner exit. You might find that you prefer the car's handling behavior that way.


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Yup, what he said. Stagger them with fronts about +2-3psi over rear.
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Old 11-06-2012, 12:54 PM   #11
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liquid filled analog gauges are my favorite

The pressure gauge can always be replaced with an even more accurate liquid filled gauge, but there are several from JEGS this is one at 48.00 plus shipping; accuracy is not cheap.

http://www.jegs.com/i/Intercomp/541/...oductId=937095
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Old 11-09-2012, 12:08 AM   #12
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Thanks for all the tips. I have a few dial gauges (not very expensive) and they all read the same so I'm betting the DIC is off. I will probably invest in more accurate tool just for my piece of mind. I also intend to take the advice and try a couple of different pressures to see what works best for me.
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Old 11-09-2012, 05:47 AM   #13
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Your gauge is probably wrong. The tire pressure system is very accurate.
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Old 11-09-2012, 06:35 AM   #14
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It cannot be any more accurate than how well within the permissible electrical and physical/mechanical tolerances the bits inside your specific sensors are. And that's assuming that all of your sensors are fully within spec.


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Old 11-09-2012, 08:02 AM   #15
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Tire pressure in a day to day non-race enviornment doesn't need to be accurate to 4 decimal places folks.
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Old 11-09-2012, 08:08 AM   #16
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Tire pressure in a day to day non-race enviornment doesn't need to be accurate to 4 decimal places folks.
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Old 11-09-2012, 08:10 AM   #17
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I ran 30psi cold on all my corvettes and will do the same on my Camaro. The roads do get extremely hot here in summer so the tire pressure goes up quite a bit. The reason I run lower PSI is to get more grip on the road. However the corvette manual states to run something like 40PSI if you want to drive at very high speeds safetly.

I say trust the inboard tire pressure numbers.
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Old 11-09-2012, 10:37 AM   #18
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Tire pressure in a day to day non-race enviornment doesn't need to be accurate to 4 decimal places folks.
Agreed.

But when there is up to 5 psi difference between the DIC pressure display and the measurements obtained using various other gauges, I'm not going to automatically trust either a DIC or an "unknown" gauge. Sources of error/inaccuracy exist in both.

What I will do is play around with pressures until I find a combination that best suits me, using just one gauge. Then I will note what any other gauge I might use reads. This will usually disagree with the mfr-suggested pressures a little, but I've come to expect that to be the case.


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Old 11-09-2012, 11:35 AM   #19
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If you want an accurate tire pressure gauge, here's one that might be accurate enough for you.

http://www.longacreracing.com/catalo...d=1520&catid=8

"
Reads pressures to 100 psi. Accurate throughout the range to 1/10 of a pound!
"
And temperature compensated.
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Old 11-09-2012, 03:17 PM   #20
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Originally Posted by HDRDTD View Post
If you want an accurate tire pressure gauge, here's one that might be accurate enough for you.

http://www.longacreracing.com/catalo...d=1520&catid=8

"
Reads pressures to 100 psi. Accurate throughout the range to 1/10 of a pound!
"
And temperature compensated.
I'll take two. At that price you should have one as a backup just in case.
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Old 11-09-2012, 06:48 PM   #21
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It cannot be any more accurate than how well within the permissible electrical and physical/mechanical tolerances the bits inside your specific sensors are. And that's assuming that all of your sensors are fully within spec.


Norm
You can believe what you want, but I'll say it again. The system is very accurate. There's a reason the sensors cost $75+ each. Buy a good digital tire pressure gauge and it will match the tire monitor system with maybe only 1 PSI difference.
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Old 11-09-2012, 08:39 PM   #22
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The most accurate gauge is one that has been calibrated by an accredited lab.
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Old 11-10-2012, 07:56 AM   #23
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You can believe what you want, but I'll say it again. The system is very accurate. There's a reason the sensors cost $75+ each. Buy a good digital tire pressure gauge and it will match the tire monitor system with maybe only 1 PSI difference.
You can design something to be 99% accurate, but that does not guarantee that the production side is equally precise, or that all "outliers" are caught before shipment to final assembly. Don't assume that every single sensor is tested, or that there can't be error functions in the BCM or wherever the sensor data is processed.

Like I said before, I really don't care exactly what any pressure measurement system displays. I'm going to tune the pressures to what works. You could do lots worse than that.


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