what air pressure should be used in tires @ 100 + mph ?

**Speedy_Gonzales** · 10-19-2006, 08:59 PM

whats the right psi for going over 100 mph ? my tire size is 275/40/17 cooper zion

**ss~zoso~ss** · 10-21-2006, 07:55 PM

none of us go that fast, its agains the law, good question tho

**JwMonE99** · 10-21-2006, 08:26 PM

Its good to alwayz keep it at least 32

**Terrance** · 10-24-2006, 10:17 AM

30 psi normal application for 1998-2002 Camaro Z28 and SS(per door sticker)
max out to whatever the max inflation pressure on the tire is for high speeds, but traction will suffer
lower down to the minimum for improved handling, but acceleration will will suffer.

I Work for GOODYEAR if you are wondering how I know

**Speedy_Gonzales** · 10-24-2006, 09:03 PM

Originally Posted by Terrance

30 psi normal application for 1998-2002 Camaro Z28 and SS(per door sticker)
max out to whatever the max inflation pressure on the tire is for high speeds, but traction will suffer
lower down to the minimum for improved handling, but acceleration will will suffer.

I Work for GOODYEAR if you are wondering how I know

ya I read on the door sticker but was not sure about speeds over a 100..ok read in the manual 38 psi over 100 mph

**Ripper415** · 10-28-2006, 02:28 PM

I check my tire pressure maybe every other week and keep all 4 at 30 psi. Since you said the manual called for 38psi for over 100 mph driving, what if I had it at my normal 30 psi but only went over 100 for a brief period....like say im racing someone and i'd spend maybe 30 seconds total over 100 mph? will that cause extra wear on the tires?

**Spitfire** · 10-28-2006, 03:43 PM

NOBODY HERE GOES OVER 100mph? That's a bunch of BS.
If you own this type of car and don't push it past that you don't know what you're missing.

**Speedy_Gonzales** · 10-28-2006, 05:19 PM

Originally Posted by Ripper415

I check my tire pressure maybe every other week and keep all 4 at 30 psi. Since you said the manual called for 38psi for over 100 mph driving, what if I had it at my normal 30 psi but only went over 100 for a brief period....like say im racing someone and i'd spend maybe 30 seconds total over 100 mph? will that cause extra wear on the tires?

lower air pressure is for better handling and higher air pressure for better speed i dont think it will affect tire wear just performance

**PaganEgyptian** · 10-28-2006, 08:51 PM

I have ran 35 f/r and ran 120, when I went for 150 I ran 40 psi f/r due to downforce pressures on the car, which adds load to the tires. If you notice the car sinking as you go faster, its the aerodynamics of our cars coming into effect. the faster we go, the most downforce on our cars which holds them to the road better. I havent read an official windtunel test, but I am guessing at 110mph, the down force is a few hundred pounds, at 130 it could be well over 600lbs pushing down. Hence the need for more tire pressure. A comparison is to drive regular highway speeds with couple really fat chicks in the car and see how the difference is running 30psi versus 40psi. The effect on the car is the only kind you want if there were two hot girls in the car and it being parked...

**Red Baron** · 11-03-2006, 08:13 PM

So what's the top end of a stock '99 Z-28 M6? 135 maybe 150??

**98Z-28Camaro** · 11-05-2006, 01:02 PM

I think they have a speed limiter at 158. No sure though.

**Jims455** · 11-05-2006, 01:13 PM

high speeds means more heat, more heat increases the tire pressure so if you are driving fast for extended periods of time, ie: hot lapping on a track, then you need to check the the pressure after one of these runs to make sure that you are not getting to much pressure.

**Red Baron** · 11-05-2006, 05:02 PM

Thanks..I was wondering. I've heard of 150 +, but thought they were blowing smoke. I guess 150 + is possible. Thanks for your input.

Anybody else have any idea of top end of a stock 99 Z28 M6 3.42?

**Jims455** · 11-06-2006, 08:27 AM

my '93 M6 was 153+ so I got to think that with ~50 more hP on tap the newer cars gotta be upwards of 160ish

**98Z-28Camaro** · 11-06-2006, 01:15 PM

I have ran mine, which is an a4 and at the time 3.23s to 162ish. Now with 3.73s it is at about 5800 at 145 or there about.

**SuperSport** · 11-08-2006, 07:37 AM

The owner's manual reads...

If you’ll be driving at high speeds (e.g., speeds of
100 mph (160 km/h) or higher), where it is legal, set
the cold inflation pressure to the maximum inflation
pressure shown on the tire sidewall, or to 38 psi
(265 kPa), whichever is lower.
When you end this high-speed driving, return to the
cold inflation pressure shown on the Tire-Loading
Information label.

**Chad97z** · 11-08-2006, 08:21 AM

Originally Posted by Jims455

high speeds means more heat, more heat increases the tire pressure so if you are driving fast for extended periods of time, ie: hot lapping on a track, then you need to check the the pressure after one of these runs to make sure that you are not getting to much pressure.

true but increased pressure is good for response

**Red Baron** · 11-08-2006, 04:56 PM

Thanks for the inputs. What what I'm hearing 150+ is very realistic and possible with a '99 M6 3.42.

Thanks again...Drive safe, Keep the Shiney side up, and the greasey side down!

**99blueZ** · 11-09-2006, 11:47 AM

Originally Posted by Red Baron

Thanks for the inputs. What what I'm hearing 150+ is very realistic and possible with a '99 M6 3.42.

Many guys on here have hit 150 +

I personally have only got to 135 as i have no roads to really open up my car. But trust me at 135 the car had plennnnnnty left.