Recommended tire pressure on NC

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Recommended tire pressure on NC

Postby pdxa4 » Wed Sep 18, 2013 3:46 pm

Hi Brian,

Wonder if you could chime in and recommend good tire pressures for both street and spirited mountain runs.

I have just got new Dunlop Direzza II's, I ended up getting them in 215/45/17 size. And I have them on the stock 17x7 NC wheels.

I was running a weird 225/55/16 size for a number of years on my car, so it it time for something more normal :)

Many thanks
06 Sunlight Silver NC, Sport with package thus LSD.
H&R coilovers, Goodwin RACE exhaust, several other mods.
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Re: Recommended tire pressure on NC

Postby Brian » Wed Sep 18, 2013 4:27 pm

I say start at 30 PSI and then tune to taste. For canyon driving days try a bit more at 32 to 34psi. For long comfortable freeway road trips try lower like 27psi.
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Re: Recommended tire pressure on NC

Postby pdxa4 » Wed Sep 18, 2013 6:30 pm

Brian wrote:I say start at 30 PSI and then tune to taste. For canyon driving days try a bit more at 32 to 34psi. For long comfortable freeway road trips try lower like 27psi.


Excellent Brian, thanks for the recommendations. It gives me a great starting point...
06 Sunlight Silver NC, Sport with package thus LSD.
H&R coilovers, Goodwin RACE exhaust, several other mods.
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Re: Recommended tire pressure on NC2

Postby StephenW571 » Thu Mar 27, 2014 3:08 pm

Hi Brian
I know this is rather subjective but what would be a good tire pressure starting point for 235/40/17 on 17x8 Enkie PF01 for
A) comfortable freeway.
And
B) spirited twisty back roads?.

Thks
Steve
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Re: Recommended tire pressure on NC

Postby Brian » Thu Mar 27, 2014 4:39 pm

Same numbers....for those twisty back roads 32 to 34psi.....but ideal pressure will depend much on surface conditions, lower pressures to max grip on rougher roads. For long comfortable freeway road trips try lower like 27psi.
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Re: Recommended tire pressure on NC

Postby NaregM677 » Thu Mar 27, 2014 8:07 pm

Brian wrote:I say start at 30 PSI and then tune to taste. For canyon driving days try a bit more at 32 to 34psi. For long comfortable freeway road trips try lower like 27psi.


Really? I would have thought just the opposite. I would have figured a higher psi for the freeway (no real bursts of acceleration, cornering or braking) and a lower psi for better traction through the mountain roads, knowing that the heat being put in the tires would increase the psi as well. Help me understand what I'm missing here.
2013 Miata Club "Shadowfax"
"And the road becomes my bride..."
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Re: Recommended tire pressure on NC

Postby Brian » Thu Mar 27, 2014 9:19 pm

Notice he said "comfortable freeway". If he had said the goal was max MPG...then higher PSI on the freeway would make sense.

As for the canyon roads, 27 PSi might feel a bit sloppy on a good smooth road, allowing sidewalls to roll over....which means the tread is not working for you because the contact patch is rolling off the surface. Adding pressure helps the turn-in response, stabilizes the tire on the rim, helps keep the contact patch on the ground instead of rolling over. That's all true at least on smooth roads...which is why I noted 'but ideal pressure will depend much on surface conditions', because the rougher the road, the lower pressure you need for max traction.
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Re: Recommended tire pressure on NC

Postby NaregM677 » Thu Mar 27, 2014 10:55 pm

Makes sense. I had figured that with psi nearing 34, the tire may be so stiff and sturdy that it may encourage oversteer. Thanks for the explanation!
2013 Miata Club "Shadowfax"
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Re: Recommended tire pressure on NC

Postby StephenW571 » Fri Mar 28, 2014 6:20 pm

Thanks the advise
:D
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