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Old 02-24-2012, 08:35 PM   #1
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ProCal Question

Hi guys: searched the forum but couldn't find an answer - probably wasn't searching hard enough

Do I need to set the tire size (running 33") prior to setting the low tire pressure threshold?
Reason being, it's not working. LOL. Calculated the very difficult math equation (equaling a psi of 29), set the ignition (without the engine being on)...but the low tire pressure chime and light still comes on. See pic.

Any suggestions, thoughts?
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Old 02-24-2012, 08:38 PM   #2
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After setting the Procal for 29 PSI, did you plug it into the OBDII port, and did the horn honk?

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Old 02-24-2012, 08:39 PM   #3
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Oh, you posted then logged out?

Best I can do for ya: sometimes you have to drive around for a bit before the new setting will "take."

Good luck with it.
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Old 02-24-2012, 08:43 PM   #4
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Oh, you posted then logged out?

Best I can do for ya: sometimes you have to drive around for a bit before the new setting will "take."

Good luck with it.
Sorry kbwwolf - tended to the kids for a sec. Yes, the horn sounded. I may just have to drive around a bit tomorrow.

thanks again for your help!
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Old 02-24-2012, 08:48 PM   #5
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Sorry kbwwolf - tended to the kids for a sec. Yes, the horn sounded. I may just have to drive around a bit tomorrow.

thanks again for your help!
Messing with you, dude.

I'm pretty sure on mine the dash light was still on, and I seem to recall thinking WTF (probably just like you). But after I made a grocery run and some other stuff, it went off, and hasn't been back on yet.

Took awhile to figure out how to do the math for the mileage part, didn't it? I hate math.
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Old 02-24-2012, 08:54 PM   #6
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Messing with you, dude.

I'm pretty sure on mine the dash light was still on, and I seem to recall thinking WTF (probably just like you). But after I made a grocery run and some other stuff, it went off, and hasn't been back on yet.

Took awhile to figure out how to do the math for the mileage part, didn't it? I hate math.
I know dude...from your other posts, our sense of humor is the same my friend, although the wife has no appreciation for it

You were totally right, I just got this from AEV's user guide, guess I should have read it in its entirety:

"Some users have reported the TPMS indicator lamp staying on after setting the Low Pressure Threshold to a new value. The TPMS sensors use timed and pressure-loss triggers to update the vehicle of tire pressures. In the event that the Low Pressure Threshold has changed to a value equal to or higher than actual tire pressure, the tires must be inflated to at least 5 psi over the new low value. The vehicle must then be driven up to 10 minutes above 15mph before the TPMS sensors update the vehicle of the new tire pressure. Once the reported tire pressure is 5psi above the Low Pressure Threshold the TPMS indicator lamp will turn off"

Thanks again dude.
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Old 02-24-2012, 09:04 PM   #7
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Now that I think about it...29 PSI might not be low enough. If you're running 33" tires, you want the actual tire pressure to be at around 30-32 PSI for optimum wear.

Most tire shops, and even dealers, are utterly clueless about airing up an aftermarket 4x4 tire, and will use the recommended PSI on your door placard (37, I think?). This is way too high. Just to give you an idea, I'm running 35" DuraTracs with 32 PSI.

The 30-32 is, of course, just a starting point. The best way to determine your optimum tire pressure is through a chalk test.

There are two versions of the chalk test:

For the first, you simply draw a straight line across your tires, then drive on em and see how the line itself wears. You can use chalk, grease pencil, crayon, etc...just make sure it's a dry day.

Here's a link:

Tire Pressure Tips - JP magazine

For the second, you need some sidewalk chalk and a flat asphalt parking lot or driveway.
How to Chalk Tires | eHow.com

So, once you get your PSI figured out, you may wanna lower the warning threshold on the TPMS to 25 or so.

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Old 02-25-2012, 06:48 AM   #8
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Now that I think about it...29 PSI might not be low enough. If you're running 33" tires, you want the actual tire pressure to be at around 30-32 PSI for optimum wear.
Thanks man. I was thinking about that too...just set it and everything worked!

Where abouts are you in Wisconsin dude? Any trails you willing to share with a rook? I'm not too far from the border.
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Old 02-25-2012, 07:34 AM   #9
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Thanks man. I was thinking about that too...just set it and everything worked!

Where abouts are you in Wisconsin dude? Any trails you willing to share with a rook? I'm not too far from the border.
I'm in the Fox Valley, about a 1/2 hour south of Green Bay. Unfortunately, there aren't a lot of trails open to 4x4's in the southern part of the state. A lot of em are snowmobile/atv-only trails. Private property is almost always marked and gated (which is good).

I sometimes use a network of hunting/fire roads not far from my house, but they're more for access to hunting cabins and tree blinds and are generally lame.

Most of the decent wheeling in Wisconsin is up in the national forests in the North Woods. Just make sure you get a map from one of the ranger stations or the DNR hq ahead of time, so you know what's open and what's closed. The best bet here is to join a local club...they often have setups on private land.

This spring I'm gonna look into heading down to the Badlands in Indiana or the Cliffs in Illinois. Maybe do both on one trip.

And a buddy of mine takes a week-long summer trip to MN every year (not sure where they go) for camping/wheeling that sounds like it's got some challenging terrain.
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Old 02-25-2012, 08:11 AM   #10
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Take a trip out here to CA, we got all kinds

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