High tyre pressures from dealer - check your pressures!

[rtv900]

Wr

Wrong.

It is 36 front and 38 rear here like all cars

On the tyre plate..........mate..........

 

[rtv900]

I guess mine is the only one not like "all cars"

 

[Nedstand]

I notice some of the labels are marked "J40", while mine is marked "J53" and your's is "J63". Anyone know what this is about?

 

[Volfy]

I have a couple of infra-red temp guns that I use to check my A/C and report back to my HVAC guy.
If I wanted to use this to check my tire, what would I be looking for? Same temp center of tire vs outer edge? And what adjustment would I make?

Thanks!

The pros use contact-type tire pyrometers, but those IR temp guns can be quite useful. That's what I use. Make sure to get up close to the tire surface, as the cone area starts to spread out too much the farther out you hold the gun.

@Volfy may have better Stinger-specific advice, but in general I'd expect to see higher temps at center for overinflated, higher at edges for underinflated, and higher from one side to the other for excessive camber.

This is correct, but mostly in a track setting, where you'll generally get more useful readings immediately after a track session, where the tires get worked hard.

For the temp reading across the tire tread, that can be more telling at a very technical course where there are lots of turns and few straights, so lateral stresses on the tires dominate. If the track has a lot of long straights, the readings might get skewed a bit by the tires ballooning at very higher speeds.

The most basic tire temp reading though is simply how much temp rise each tire registers after the same workout. Tire temp increase mostly because of carcass flex. The lower the pressure, the more tire temp will rise. This is why you tend to see a lot of tire blowouts later in the fall season. A lot of motorists don't adjust their tire temp to compensate for the dropping ambient temp. Consequently, the too low tire temp will allow the tire carcass to flex excessively, potentially to the point of overheating and eventually tire failure.

So... if after a track session, your tire temps front and rear have risen similar amount, that is generally an indication that your car's cornering attitude is fairly neutral. If your front tires are hotter, then the car is likely pushing into the corner (understeering) scrubbing off speed with the front tires. OTOH, if the rear tires are hotter, then the car might be oversteering with too much slip angle on the rea tires. If you are familiar with your own car's handling traits, your driving impressions should corroborate the tire temp findings. This is why I said the tires will talk to you, if you know what/how to listen.