40 psi all around

ZStig · 09-09-2008, 10:57 AM

running on stock 18s, I decided to try 40psi all around. I understand potential tire wear issues, and I'm ok with that.

What I've found was that my front end has significantly more grip in tight corners. In fact, I've taken some highway ramps with decreasing radius turns that used to turn on my traction control on, but now the car deals with it just fine.

Ride is a bit more harsh, and I haven't seen significant gains in mileage YET, but I'd say its definately worth it.

xg3 · 09-09-2008, 03:15 PM

maybe i will give that a try, i have been running 32/36 like it says on spec... but.. damn it loses traction faster than me on ice.

ZStig · 09-17-2008, 01:59 PM

what kind of tires?

BlackSapphireZ · 09-18-2008, 09:25 AM

40psi will make u slide more as tires have less grip of the road...

ZStig · 09-20-2008, 04:36 PM

I've noticed some oversteer under braking, but its fun

MMMazing07 · 09-20-2008, 04:53 PM

i wouldnt do a higher psi as much as 40. if you want to decrease understeer lower the front tires to 30

xg3 · 09-21-2008, 07:51 PM

i am running 36psi / 38 psi... i think factory recommends, 32 / 34?

i don't remember..

PS.. Federal SS595 sucks dockey's cock.. i got Goodyear F1 Eagle on the front, awesome tires... but rear went, and had to replace it with cheap tires, cuz F1 wasn't in stock.. next year, i think i will try some Michellin PS2 (forgot waht hte model is)

Silververtu · 09-28-2008, 09:15 PM

factory recommends 33/38 psi.

ZStig · 10-27-2008, 01:47 PM

yea.. I brough it back to 36/38

DerekSelmanRacing · 10-29-2008, 07:43 AM

I use 35/30 because of longevity.

The Z4 3.0 sport has built in understeer that is difficult/impossible to eliminate with tire pressure adjustment only. If you're driving fast enough on the street to have understeer/oversteer issues, an excellent fix would be to SLOW DOWN.

apexstrafer · 10-29-2008, 06:30 PM

Yeah, why are you driving your sports car like a...sports car?

dereksabolracing, your car has arrived:

:P

Seriously though, 40psi is fine when the tires are hot, but I wouldn't go over that. You'd be surprised how warm your tires can get just driving on the freeway and how much pressures can increase as a result.

DerekSelmanRacing · 10-30-2008, 08:18 AM

apexstrafer: Going to Buttonwillow next weekend?

Trust me I know how to drive, go to Buttonwillow next weekend and I'll allow you to be the judge

apexstrafer · 10-30-2008, 01:18 PM

Haha you're on! Which day, Sat or Sun? What car should I look for? I always like a little friendly competition

DerekSelmanRacing · 10-30-2008, 04:26 PM

We'll be there both days; I'll be driving in TTD class and my Dad will be driving in HPDE3. Photos of the car (a LOWLY, 2005 Z4 3.0 sport) are in the photos category under official yellow thread.

Don't forget to bring the pink slip for my new gold Toyota or, if you don't have it, I'll settle for the "M".

P.S. You do realize it's not this weekend but the weekend of the 8-9th with NASA?

09-09-2008, 10:57 AM	#1
ZStig instagram 997turbotom 279 Rep 7,376 Posts Drives: Interlagos Z4MR Join Date: Jun 2008 Location: Delray Beach, FL iTrader: (4)	40 psi all around running on stock 18s, I decided to try 40psi all around. I understand potential tire wear issues, and I'm ok with that. What I've found was that my front end has significantly more grip in tight corners. In fact, I've taken some highway ramps with decreasing radius turns that used to turn on my traction control on, but now the car deals with it just fine. Ride is a bit more harsh, and I haven't seen significant gains in mileage YET, but I'd say its definately worth it.
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09-09-2008, 03:15 PM	#2
xg3 Private First Class 5 Rep 145 Posts Drives: Was 03 Z4, now 10 GTI Join Date: May 2008 Location: Toronto iTrader: (0)	maybe i will give that a try, i have been running 32/36 like it says on spec... but.. damn it loses traction faster than me on ice.
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09-17-2008, 01:59 PM	#3
ZStig instagram 997turbotom 279 Rep 7,376 Posts Drives: Interlagos Z4MR Join Date: Jun 2008 Location: Delray Beach, FL iTrader: (4)	what kind of tires?
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09-18-2008, 09:25 AM	#4
BlackSapphireZ Major 97 Rep 1,191 Posts Drives: 22 GLE 53 Coupe Join Date: Aug 2007 Location: Ladson, SC iTrader: (0)	40psi will make u slide more as tires have less grip of the road... __________________ 2022 GLE 53 Coupe
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09-20-2008, 04:36 PM	#5
ZStig instagram 997turbotom 279 Rep 7,376 Posts Drives: Interlagos Z4MR Join Date: Jun 2008 Location: Delray Beach, FL iTrader: (4)	I've noticed some oversteer under braking, but its fun
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09-20-2008, 04:53 PM	#6
MMMazing07 More than you can afford pal....ferrari 180 Rep 1,471 Posts Drives: Z4M Join Date: Aug 2007 Location: MD iTrader: (0)	i wouldnt do a higher psi as much as 40. if you want to decrease understeer lower the front tires to 30
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09-21-2008, 07:51 PM	#7
xg3 Private First Class 5 Rep 145 Posts Drives: Was 03 Z4, now 10 GTI Join Date: May 2008 Location: Toronto iTrader: (0)	i am running 36psi / 38 psi... i think factory recommends, 32 / 34? i don't remember.. PS.. Federal SS595 sucks dockey's cock.. i got Goodyear F1 Eagle on the front, awesome tires... but rear went, and had to replace it with cheap tires, cuz F1 wasn't in stock.. next year, i think i will try some Michellin PS2 (forgot waht hte model is)
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09-28-2008, 09:15 PM	#8
Silververtu Major 231 Rep 1,066 Posts Drives: 2015 X5 50i M Sport Join Date: Aug 2007 Location: US of A iTrader: (5) Garage List 2019 Porsche Cayenn ... [10.00]	factory recommends 33/38 psi. __________________ 2019 Cayenne Turbo Gone but not forgotten: 2006 2.0T A4 Avant, 2007 Z4 Roadster 3.0si, 2006 M Roadster, 2013 550i M Sport, 2015 Cayman S, 2015 X5 50i M Sport
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10-27-2008, 01:47 PM	#9
ZStig instagram 997turbotom 279 Rep 7,376 Posts Drives: Interlagos Z4MR Join Date: Jun 2008 Location: Delray Beach, FL iTrader: (4)	yea.. I brough it back to 36/38 __________________
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10-29-2008, 07:43 AM	#10
DerekSelmanRacing Second Lieutenant 8 Rep 222 Posts Drives: 05 Z4 3.0 SMG, 01 530 Join Date: Jul 2008 Location: Lake Havasu City, AZ. iTrader: (0)	I use 35/30 because of longevity. The Z4 3.0 sport has built in understeer that is difficult/impossible to eliminate with tire pressure adjustment only. If you're driving fast enough on the street to have understeer/oversteer issues, an excellent fix would be to SLOW DOWN.
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10-29-2008, 06:30 PM	#11
apexstrafer First Lieutenant 14 Rep 385 Posts Drives: Z4 M Coupe Join Date: Sep 2007 Location: Los Angeles, CA iTrader: (0)	Yeah, why are you driving your sports car like a...sports car? dereksabolracing, your car has arrived: :P Seriously though, 40psi is fine when the tires are hot, but I wouldn't go over that. You'd be surprised how warm your tires can get just driving on the freeway and how much pressures can increase as a result. __________________
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10-30-2008, 08:18 AM	#12
DerekSelmanRacing Second Lieutenant 8 Rep 222 Posts Drives: 05 Z4 3.0 SMG, 01 530 Join Date: Jul 2008 Location: Lake Havasu City, AZ. iTrader: (0)	apexstrafer: Going to Buttonwillow next weekend? Trust me I know how to drive, go to Buttonwillow next weekend and I'll allow you to be the judge Last edited by DerekSelmanRacing; 10-30-2008 at 09:20 AM..
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10-30-2008, 01:18 PM	#13
apexstrafer First Lieutenant 14 Rep 385 Posts Drives: Z4 M Coupe Join Date: Sep 2007 Location: Los Angeles, CA iTrader: (0)	Haha you're on! Which day, Sat or Sun? What car should I look for? I always like a little friendly competition __________________
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10-30-2008, 04:26 PM	#14
DerekSelmanRacing Second Lieutenant 8 Rep 222 Posts Drives: 05 Z4 3.0 SMG, 01 530 Join Date: Jul 2008 Location: Lake Havasu City, AZ. iTrader: (0)	We'll be there both days; I'll be driving in TTD class and my Dad will be driving in HPDE3. Photos of the car (a LOWLY, 2005 Z4 3.0 sport) are in the photos category under official yellow thread. Don't forget to bring the pink slip for my new gold Toyota or, if you don't have it, I'll settle for the "M". P.S. You do realize it's not this weekend but the weekend of the 8-9th with NASA?
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