Tires, Pressure and Wear
04-19-18, 02:38 PM
#16
After a week of testing, I have arrived at a cold front pressure of 48PSI and cold rear pressure of 46PSI as the optimal values needed to produce an even temp across the entire tread of the tire. This is substantially city driving. I will continue to monitor on my next out of town jaunt.
It does, in fact, ride pretty stiff. It feels like it is set to Sport S+ with a less responsive throttle.
This would appear to be another reason to go up at least one size on tires since it will be both wider and taller. On the same 8" rim, I think it will tend to bow the tread a bit so that even contact can be achieved at lower pressure. If this doesn't make sense, imagine a very wide tire on a very narrow rim at the extreme. It won't take very much pressure to bow the tire tread out. In reverse, picture a wide rim with a relatively narrow tire. It will take a lot of pressure to keep the tread flat.
It does, in fact, ride pretty stiff. It feels like it is set to Sport S+ with a less responsive throttle.
This would appear to be another reason to go up at least one size on tires since it will be both wider and taller. On the same 8" rim, I think it will tend to bow the tread a bit so that even contact can be achieved at lower pressure. If this doesn't make sense, imagine a very wide tire on a very narrow rim at the extreme. It won't take very much pressure to bow the tire tread out. In reverse, picture a wide rim with a relatively narrow tire. It will take a lot of pressure to keep the tread flat.
I'm going to change mine to 40PSI cold all around but don't want to push it too much further.
04-19-18, 04:28 PM
#17
Instructor
Thread Starter
If you want to test it yourself, the human hand is pretty good at sensing differences in temperature as low as 2° difference. Next time you get home, run your hand across the surface of your tire and see if the edges, one edge or the center is hot. You might be surprised.
I'm going to start checking my wife's Honda HR-V to see how it specs out.
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eddie420 (04-19-18)
05-30-18, 09:14 AM
#18
Instructor
Thread Starter
After 45 days of testing this, I'm still running 48psi front and 46psi rear. I've done a few other tests. I did a panic stop in the driveway and you can see a solid, full contact black skid mark for about a foot before the ABS released it on me.
With that knowledge, I'm quite comfortable with the safety and wear of my tires at these pressures.
I'll update periodicallly if I have anything of interest to add.
With that knowledge, I'm quite comfortable with the safety and wear of my tires at these pressures.
I'll update periodicallly if I have anything of interest to add.
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eddie420 (06-02-18)
05-30-18, 11:53 AM
#19
In an effort to find out why I'm still getting vibrations I've been playing with pressures too... generally speaking going to 40+ cold seems to make the car a bit more "squirrely" in my book.
Of course mind you this is 19", GS350 F sport AWD... so all my tires are the same size.
I tried it briefly at 41F cold and 42R cold.... it actually seemed to make the vibrations worse! Definitely makes the ride harsher.
Also seems to make "tracking" a bit squirrely, like the car reacts faster to steering wheel input. Needless to say this experiment didn't last long... I brought it back to like 38F and 39R cold.
Even a pound or two in these things seems to make a big difference.
-Mike
Of course mind you this is 19", GS350 F sport AWD... so all my tires are the same size.
I tried it briefly at 41F cold and 42R cold.... it actually seemed to make the vibrations worse! Definitely makes the ride harsher.
Also seems to make "tracking" a bit squirrely, like the car reacts faster to steering wheel input. Needless to say this experiment didn't last long... I brought it back to like 38F and 39R cold.
Even a pound or two in these things seems to make a big difference.
-Mike
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eddie420 (06-02-18)
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