Tire pressure on 19" Pilot Sport 4S?

Bilazaurus · 07-19-2019, 11:34 AM

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?

bpchaos · 07-19-2019, 02:01 PM

Put it to the manufacturer recommended, then adjust based on wear.

2011 Nismo#91 · 07-21-2019, 07:57 AM

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.

Bilazaurus · 08-16-2019, 08:06 AM

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.

HapaZ · 08-24-2019, 09:26 AM

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.

07-19-2019, 11:34 AM	#1 (permalink)
Bilazaurus Base Member Join Date: Feb 2019 Location: Poland Posts: 22 Drives: 13' 370Z AT Platinum Rep Power: 7	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?

07-19-2019, 02:01 PM	#2 (permalink)
bpchaos Base Member Join Date: Oct 2016 Location: Los Angeles, CA Posts: 74 Drives: G37S (370z+ seats) Rep Power: 3364	Put it to the manufacturer recommended, then adjust based on wear. Brendan and LennyK like this.

07-21-2019, 07:57 AM	#3 (permalink)
2011 Nismo#91 A True Z Fanatic Join Date: Mar 2011 Location: NJ Posts: 2,408 Drives: slowly Rep Power: 40570	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. LennyK likes this.

08-24-2019, 09:26 AM	#5 (permalink)
HapaZ Base Member Join Date: Sep 2014 Location: NorCal Posts: 246 Drives: 2012 370z Base Coupe Rep Power: 11	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. physics likes this.

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08-16-2019, 08:06 AM	#4 (permalink)
Bilazaurus Base Member Join Date: Feb 2019 Location: Poland Posts: 22 Drives: 13' 370Z AT Platinum Rep Power: 7	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.