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Tire pressure on 19" Pilot Sport 4S?

Hi. I guess that many of you have 4S's on your Z's. Did anyone experiment with tire pressure? Would stock 35 psi be optimal for both rear and front?

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Old 07-19-2019, 12:34 PM   #1 (permalink)
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Default Tire pressure on 19" Pilot Sport 4S?

Hi. I guess that many of you have 4S's on your Z's. Did anyone experiment with tire pressure? Would stock 35 psi be optimal for both rear and front?
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Old 07-19-2019, 03:01 PM   #2 (permalink)
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Put it to the manufacturer recommended, then adjust based on wear.
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Old 07-21-2019, 08:57 AM   #3 (permalink)
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Tire pressure is a function of car weight/contact patch on the tire rather than type. Stick with stock settings which is the best compromise of performance and longevity.
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Old 08-16-2019, 09:06 AM   #4 (permalink)
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Sorry to revive a dead thread (hey, good name for a band!). I've did some experiments with 4s pressures. 35psi is much to slidey. I don't remember my torque (forgot) but power was upped to about 379hp and I'm struggling to maintain traction. VDC partially turned off (button) and I don't really go WOT unless I'm 80/90kmh on 3rd gear (AT).
Otherwise it just slips. I can easily control going a tiny bit sideways but that's not the point. I had MPSS on 350Z and losing traction was a very hard thing to do.

I'm going back to 32psi but I'm afraid that I'll wear them to quickly. I thought 32 psi is slidey but 35psi is very bad or rather very challenging to the point I don't really feel safe with much spirited driving. Or maybe the tyre compound degraded? I can't tell because I bought my Z with them already on. They are 2yo, only few k's driven. How low can I set the pressure for rear 4s's on street? Is 31psi too low? Air temperature here is from 65F to 82F, rather sunny. Sorry if I ask too many stupid questions but this issue takes away much from pleasures of driving my 370Z.
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Old 08-24-2019, 10:26 AM   #5 (permalink)
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We can talk hypotheticals all day long, but it’s going to take some experimentation to find the optimal pressure for the way you drive. Take a piece of chalk and make a mark from the tread block down part of the side wall. Go for a spirited drive and then check to see how much chalk has been worn off. If the side wall has missing chalk your pressure is too low so increase 1-2 psi, make a new chalk mark and repeat the drive. If the chalk line still remains on the tread block lower your pressure by 1-2 psi.
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