Tire pressure - ZR-1 Net Registry Forums

bobbyhi · 01-17-2006

I have Goodyear F1 GS-D3's on my car and am wondering what tire pressure you others guys are using. The max PSI is 51. Just curious as my car seems to ride "hard". I am at 50 PSI and think that I could go lower for a more "softer" ride without giving up too much in the speed department (not that I go that fast). Any suggestions??

FASTZR1 · 01-17-2006

I have had the F1 GSD 3's for over three years. I run 33-35 p.s.i. front and 33 p.s.i. rear for normal driving. Excellent wear. Auto-Cross I run 42 in the front and 39 in the rear. Drag racing, 21 p.s.i. and they are very sticky. I have a couple of 60 foot times in the 1.8's!!! I love 'um! Time to buy new rears!

JohnnyB
FASTZR1

Fort94z · 01-17-2006

I run around 32 psi. I think the car rides good at that psi.

Aurora40 · 01-17-2006

The max PSI stamped on the sidewall is the rated maximum pressure the tire can handle at load. It is NOT a recommendation to use that pressure. I would imagine at 50psi you will get some uneven wear of the tire.

The door sticker on my car suggests 30psi. This is based on the tire size and load rating, and a different brand of tire that meets the same size/load rating would be similarly inflated. A GS-D3 doesn't need 20psi more than a GS-C just because of the rated sidewall markings. I would think a pressure in the 30-40psi range would be a lot better in terms of traction and wear.

Interestingly, the door sticker says 30psi, but I just noticed the service manual says 35psi for coupes.

RICHARD TILL · 01-17-2006

35 all around for me. treadwear=even. i`ll bet with 50, it rides like a steel tired wagon.

tomtom72 · 01-18-2006

I use 33-35 psi on my D3's. I have to go check my door sticker & see what it says? I thought 35 psi was on it & in the owner's manual? I've tried 30 f/r but I didn't like that too much...too mushy in the twisties. It seems to me if I use less psi in the rears than the fronts by just a couple of lbs the car is a bit more toward understeer?

I gotta find a driving school so I can relearn all this stuff...it's been too long between vettes!

bobbyhi · 01-18-2006

At 50 PSI it does ride like a wagon but this is what the tire man told me run with these tires. Didn't sound right but who am I to question the tire man. I will put 35 PSI all around and see what the difference will be. I imagine the ride will be very smooth. Thanks for all your help guys

ZR1 MK · 01-19-2006

I usually run 30 front 28 rear cold on the street. Either you misunderstood your tire man or he is a complete idiot and its time for a new tire guy. Some truck tire require high pressure as mentioned, but not any passenger class tire.

FU · 01-19-2006

With the GSD3's 30 front 28 in the rear also.

Tom · 01-19-2006

I agree with tomtom72, I have the D3's and like them at 35 better than 30. My 90 has 35 on the sticker.

01-17-2006	#1
bobbyhi Join Date: Jul 2005 Location: Mendota Heights, MN. 55120 Posts: 984	Tire pressure I have Goodyear F1 GS-D3's on my car and am wondering what tire pressure you others guys are using. The max PSI is 51. Just curious as my car seems to ride "hard". I am at 50 PSI and think that I could go lower for a more "softer" ride without giving up too much in the speed department (not that I go that fast). Any suggestions?? __________________ Bob Anderson 1990 #2405 White/Gray Haibeck chip,4:09 gears,Power Effects Exhaust,5 spoke chrome,C5 brakes,49th Street rockers,K&N,Hurst,Headers,Upper & lower ported Minnesota State Director Founding Member #19

01-17-2006	#2
FASTZR1 Join Date: Apr 2004 Location: Murfreesboro, TN Posts: 10	Re: Tire pressure I have had the F1 GSD 3's for over three years. I run 33-35 p.s.i. front and 33 p.s.i. rear for normal driving. Excellent wear. Auto-Cross I run 42 in the front and 39 in the rear. Drag racing, 21 p.s.i. and they are very sticky. I have a couple of 60 foot times in the 1.8's!!! I love 'um! Time to buy new rears! JohnnyB FASTZR1

01-17-2006	#3
Fort94z Join Date: Dec 2003 Location: New Jersey Posts: 54	Re: Tire pressure I run around 32 psi. I think the car rides good at that psi.

01-17-2006	#4
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,713	Re: Tire pressure The max PSI stamped on the sidewall is the rated maximum pressure the tire can handle at load. It is NOT a recommendation to use that pressure. I would imagine at 50psi you will get some uneven wear of the tire. The door sticker on my car suggests 30psi. This is based on the tire size and load rating, and a different brand of tire that meets the same size/load rating would be similarly inflated. A GS-D3 doesn't need 20psi more than a GS-C just because of the rated sidewall markings. I would think a pressure in the 30-40psi range would be a lot better in terms of traction and wear. Interestingly, the door sticker says 30psi, but I just noticed the service manual says 35psi for coupes. __________________ Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img]

01-17-2006	#5
RICHARD TILL Join Date: Aug 2005 Location: Iuka, Mississippi 38852 Posts: 756	Re: Tire pressure 35 all around for me. treadwear=even. i`ll bet with 50, it rides like a steel tired wagon.

01-18-2006	#6
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: Tire pressure I use 33-35 psi on my D3's. I have to go check my door sticker & see what it says? I thought 35 psi was on it & in the owner's manual? I've tried 30 f/r but I didn't like that too much...too mushy in the twisties. It seems to me if I use less psi in the rears than the fronts by just a couple of lbs the car is a bit more toward understeer? I gotta find a driving school so I can relearn all this stuff...it's been too long between vettes! __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

01-18-2006	#7
bobbyhi Join Date: Jul 2005 Location: Mendota Heights, MN. 55120 Posts: 984	Re: Tire pressure At 50 PSI it does ride like a wagon but this is what the tire man told me run with these tires. Didn't sound right but who am I to question the tire man. I will put 35 PSI all around and see what the difference will be. I imagine the ride will be very smooth. Thanks for all your help guys __________________ Bob Anderson 1990 #2405 White/Gray Haibeck chip,4:09 gears,Power Effects Exhaust,5 spoke chrome,C5 brakes,49th Street rockers,K&N,Hurst,Headers,Upper & lower ported Minnesota State Director Founding Member #19

01-19-2006	#8
ZR1 MK Join Date: Aug 2005 Location: NY Posts: 143	Re: Tire pressure I usually run 30 front 28 rear cold on the street. Either you misunderstood your tire man or he is a complete idiot and its time for a new tire guy. Some truck tire require high pressure as mentioned, but not any passenger class tire. __________________ Mike 427 cu in LT5 [URL="http://zr1mk.weebly.com"]http://zr1mk.weebly.com[/URL]

01-19-2006	#9
FU Join Date: Mar 2004 Location: Found Member Posts: 4,346	Re: Tire pressure With the GSD3's 30 front 28 in the rear also. __________________ Frank Urbo. NCM Lifetime member # 982 Registry Founding # 237

01-19-2006	#10
Tom Join Date: Jan 2004 Location: Southern CA Posts: 108	Re: Tire pressure I agree with tomtom72, I have the D3's and like them at 35 better than 30. My 90 has 35 on the sticker.