Tire pressure monitor system

[justscootin]

I have found that the TPM is never accurate from one day to the next I have found the pressure may go up or down as much as 4 lbs. I can't trust the unit. I realize there is a software update available for the scooter and it is going to be done next week when my scooter goes in for the luggage rack recall. I have that takes care of it, anyone else with this issue

 

[bill steele]

Mine is about 1 lb. off (low) so I,m not worried the pressure goes up as the tires get warm by about a 1 lb. or 2 which is normal.

 

[trekguy]

I am one of those riders who rarely messes with tire pressures, but I like the fact that one can check them with the info button. If a tire would be drastically too low or too high, wouldn't that yellow triangle light up to alert the rider...you know, like my car?

 

[justscootin]

Today I had the scooter in to get the luggage rack recall taken care of.
I also had the software updated and at the same time had the TPM changed from the bar system to pounds.
What I should have had done but did not was to have the trip 2 log changed from km to miles (if doable) leaving trip 1 as km. Oh well next time it is in for service or if the gs911 can do it when it is available for the scooter.

 

[omniphil]

I wonder what else the software update does? I have noticed that the Temp gauge can sometimes be accurate an other times way off, pretty odd..

Also to Note, the TPMS displays corrected values, not actual pressure. They are corrected to 68 degrees F. Mine stay within a pounds from cold to fully warm. So at least those seem to be accurate.

 

[dmltech]

My TMPS quit working a couple of months ago - it would not show values, just "--". They did a software update and everything is working great now. The values (when cold) seem to be within a pound or two of my tire gauge.

 

[ItsPhilD]

I have noticed that the Temp gauge can sometimes be accurate an other times way off, pretty odd..

You have a Temp Gauge? I have a Fuel Gauge and a Tachometer but those are my only gauges.

 

[ItsPhilD]

Also to Note, the TPMS displays corrected values, not actual pressure. They are corrected to 68 degrees F. Mine stay within a pounds from cold to fully warm. So at least those seem to be accurate.

What sense does that make? I live in Phoenix, AZ and we won't see 68˚ for another few months. I wake up in the morning and it's at least in the low 80's with daily highs 100˚ to 115˚ this time of year. What good does it do me to know what my tire pressure would be 40˚ cooler then my ambient temp?

 

[omniphil]

Maybe I should say Temp display? There's all sorts of info in the display cluster...

You have a Temp Gauge? I have a Fuel Gauge and a Tachometer but those are my only gauges.

 

[omniphil]

It makes sense because the manufactures recommended tire pressures are based on 68 degrees F since temperature effects pressures greatly so they need a baseline to start at.

What sense does that make? I live in Phoenix, AZ and we won't see 68˚ for another few months. I wake up in the morning and it's at least in the low 80's with daily highs 100˚ to 115˚ this time of year. What good does it do me to know what my tire pressure would be 40˚ cooler then my ambient temp?

 

[ItsPhilD]

Sooo, just what tire pressure should I have in my tires? By my high tech digital inflator I have the front at 35 psi and the rear at 42 psi at 90 degrees F.

 

[omniphil]

You would set them at whatever pressure that makes the display read 35/42. Which would probably be 2 psi higher than normal at 90 degrees according to your pressure gauge. Every 10 degrees of temperature is around 1psi increase.