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Pro Pulse
Tom or others,
I’m on my first trip after installing the pulse. The antenna is very much like Tom’s setup. All fine first few days. Loved being able to verify the consistent pressures and temps. Today, about 4 hours in and just crossing into Kansas, I get an alert. I find a spot to pull over and check my PAX tag. PP said it was 106 lbs. The other tag and the drives all were 103-104. All started the day at 88 cold. I adjusted the pressure down to 104. PP showed that both tags were matched for pressure and temp. 15 minutes later I got an alert that the drivers tag had climbed all the way up to 105! Heavens! The next two hours were spent checking the alerts and seeing that all was really in bounds. I checked the settings and 10% should have triggered and alarm but not 1%. Any ideas what I might change on settings? Reset all? I still like the fact that I can check pressures and temps at any time while rolling!
Thanks for the help, 3000 miles to go!
Doug
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11 Replies
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Doug,
Don’t have the manual in hand, but isn’t the factory high pressure alert set to 25%? Also, what was your target pressure on setup?
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My pressures are 104 steer, 88 drive and tag. I am going to lower the steers to 100 tomorrow morning as the temps are climbing and I saw 124 psi on steers today. I think max is 135 by Alcoa. I am under weight limit on steers.
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Doug,
Max cold pressure on 315’s is 130 psi and on 365’s it’s 125 psi. So in summer heat a climb in pressure of 25 psi would not be abnormal, so I don’t follow your pressure concerns of 124. As an example, if you’re running 125 cold on your steer, summer heat could easily get you to 150.
You mentioned Alcoa and 135, where does that number apply?
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Tom,
My Alcoa’s are stamped MAX PRES 130. I don’t need my steers at 104. Michelin calls for 100. Thought in this warmer weather I would drop down and give the Alcoa number some breathing room. Still want to sort out my PP issue. I’m sure I have a setting incorrect but haven’t been able to figure it out.
Thanks for all your help.
Doug
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By the way. I am not concerned with the pressures I am running. Just want to fine tune things. The Pressure Pro is awesome in that I can read pressures and temps on the go. This will allow me to tweak pressures and get things just right. The only thing that I want to correct is the warning alert settings. I am certain that I can correct this with proper baseline setup.
Thanks,
Doug
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The maximum tire pressures are cold pressures. The correct pressures are what is called for in the pressure charts that are based on axle weight. Adding pressure for a small cushion is OK. In fact if you don’t mind the ride you can inflate all your tires to the maximum pressure as long as you understand pressures other than what is shown in the chart compromises handling, braking, tire life or ride.
The temps and pressures when driving are never going to be as low as the cold pressures and temps but what is important is that they are reasonably close side to side on each axle.
As long as the settings for alerts on the PP are the defaults (or at least reasonable) just enjoy the ride and try not to keep scrolling thru the readings and worrying about a few pounds or degrees difference. Before I got my PP I used to measure tire temps immediately after stopping on a hot day. I have seen temps as high as 145 degrees and that is nowhere near a temp that is going to cause a tire failure. As long as the cold starting pressures were under the max pressure allowed for the tire (or wheel) the pressure after the tire heats up is OK because when the charts are made the engineers know normal use and high ambient temps are going to drive pressures above the listed max pressure.
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Doug,
Increase your high pressure alert to the default as I suggested, 25% and your false alert will go away.
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Just re-read the phrase “fine tune things”………..Keep in mind the world got along quite well for a long time before there were TPMS. Set the cold pressures correctly, verify the pressures are all OK before you start to drive and then just let the Pulse alert you when something needs attention. And pay attention to Tom’s suggestion because the factory defaults were established based on extensive experience with real world conditions.
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Thanks Tom and Jon,
I have reset the upper pres alert to 25% (was at 20). We will see how it goes tomorrow. Today was the same thing as yesterday but the alerts didn’t bother me, I just checked to make sure I didn’t miss the “big one”. Jon, I didn’t mean that I was going around chasing the ball, just that “cold temps at 45 ambient are different than those at 68. I have been motoring through light snow and am now in OK where the low was 68 so my start settings have risen a bit. My coach is relatively light so I need 100 steer and 85 drive and tag. I had pressure set at 104 steer and 88 D&T. I was aware of the Michelin cold settings and have read all your info related to tire care and want to be as proactive as I can. I have not read Alcoa’s info regarding pressures, just have the stamp on my wheels. I know I have been running well within limits for the tires and I really appreciate my new PP toy. Just want to have the alert settings correct. Tomorrow will tell.
Whenever we do meet up, Tom and Jon, the adult beverages are on me!
Doug
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Doug, if you set your tire pressures when ambient was 45, and now it is 68 ambient you are only dealing with a few degrees increase in pressure as a result of the change. Tom has a better handle on this than I do, but I don’t believe the default limits are so close as to alert as a result.
I have dealt with both higher and lower tire pressures in my limited experience because my initial tire setting always takes place in my garage which has been around 65 degrees and have gone into colder temps as well as higher temps and have not had alerts.
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Tom and Jon,Yesterday I was able to run all day with no alerts thanks to your suggestion that I set the pressure alert up from 20% to 25%. Made all the difference!
Thanks for being here,
DougJeff and Lindsay
91 Marathon XL
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