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Old 12-22-2019, 10:45 PM   #1
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Brand: Thor Motor Coach
Model: Quantum RW28
State: Florida
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THOR #15031
TMPS settings for class C

I have a Thor rw28 and purchased a off brand TMPS with 6 sensors. How do I figure out the upper and lower levels to set in the system if I use the recommended 75psi front, 80psi rear setting from Ford?

Jeff
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Old 12-23-2019, 12:57 AM   #2
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THOR #7035
I'd use 5 psi lower than cold and 10 psi higher than cold to start. If you travel a lot inn the heat you may have to bump the upper alarm higher.
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Old 12-23-2019, 01:01 AM   #3
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THOR #12542
TST recommends 20% above and 10% below the cold inflation pressure. That's probably a good enough rule of thumb.
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Old 12-23-2019, 01:23 AM   #4
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THOR #15031
Thanks guys!
Jeff
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Old 12-23-2019, 02:53 AM   #5
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Brand: Thor Motor Coach
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THOR #17018
What kind did you get. I am interested in giving my a Christmas present.
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Old 12-23-2019, 01:07 PM   #6
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THOR #15031
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Originally Posted by Drkevr View Post
What kind did you get. I am interested in giving my a Christmas present.
I bought a cheap chinese version which works but is a pain to setup. I'd go with another version like the EZTire. You can spend quite a lot on a TMPS system but it's worth it.
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Old 12-23-2019, 03:19 PM   #7
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Thanks. Good point. I just want to have something that is reliable. Amazing where we try to use bargains in areas that are sometimes more critical.
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Old 12-23-2019, 09:46 PM   #8
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Originally Posted by jtyphoid View Post
TST recommends 20% above and 10% below the cold inflation pressure. That's probably a good enough rule of thumb.
I found with my RV that 20 percent above was right at the pressure I'd see on a hot day so I biased up a few pounds.
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Old 12-23-2019, 11:11 PM   #9
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THOR #1469
I use one of the more expensive TPMS systems and here are the parameters for alerts for that system. To the best of my knowledge, I cannot change these parameters.

Pressure loss of 3 PSI or more in less than 2 minutes.
Pressure loss of 6 PSI or more in 2 to 10 minutes.
Pressure loss of 15% or more of the baseline pressure.
Pressure increase of 20% or more of the baseline pressure.
Internal tire temperature of 167F (75C).
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Old 12-25-2019, 09:48 PM   #10
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Mine too and Ive found t the 15% range from base to over pressure to be barely adequate. Ive always had to adjust my base to about 5 lbs over my actual cold pressure. Works great.
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