Can someone look at their 87 or 88 S4 for me?
02-07-2007, 11:50 AM
#106
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Originally Posted by IcemanG17
Tim
So you are going to run PS2's instead of the Yokohama's? This is quite a step up in tire width for the beast too....didn't you run 225-255's last year? Very tall tires too...but you have more than enough power to turn'em too.....I wonder what negative effect the slightly wider tires will have on the beasts aerodynamics?
Wow this turned into a serious flame war!!! All from a simple ??
So you are going to run PS2's instead of the Yokohama's? This is quite a step up in tire width for the beast too....didn't you run 225-255's last year? Very tall tires too...but you have more than enough power to turn'em too.....I wonder what negative effect the slightly wider tires will have on the beasts aerodynamics?
Wow this turned into a serious flame war!!! All from a simple ??
I'm sure the larger size will have some aero effect however I must have (Y) 200+ and the choice is very slim. Currently the only two approved are the Conti VMax and the PS2. The Conti is available only in 19" and I don't want to go there.I can't believe a simple thread turned into the tire pressure wars thread. Kind of interesting the rational some folks use to justify their personal favorite pressures. Fact is anything at or under the cold tire pressure rating is safe. You may or may not like the handling characteristics of a particular PSI in your tires but thats kind of a personal thing. I would be more concerned running very low pressures rather than the rated max tire pressures. Low pressues equal heat, flex and distortion as well as a chance of rolling the bead off. I'm surprised that no one has jumped on what is too low of a pressure since that data is not contained on the tire.
02-07-2007, 12:04 PM
#107
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OK so now we're getting closer to a sane consensus. What is the "sane" range of rear tyre pressure on a street-driven, cold 928?
SAFE RANGE
28 - tyre sidewall max (35; 44 or 51)
STICKY RANGE
30 - 38
SAFETY
In order for a tyre to be truly SAFE, it has to be both technically safe and sticky. No use having a tyre that loses grip when you need it, sending you into the barrier or oncoming traffic as you decelerate or brake from a pass.
SAFE RANGE
28 - tyre sidewall max (35; 44 or 51)
STICKY RANGE
30 - 38
SAFETY
In order for a tyre to be truly SAFE, it has to be both technically safe and sticky. No use having a tyre that loses grip when you need it, sending you into the barrier or oncoming traffic as you decelerate or brake from a pass.
02-07-2007, 12:08 PM
#108
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Paul - the risk of overinflation is twofold:
1) severe loss of traction especially under deceleration or braking or cornering and losing the tail
2) tyre explosion
1) severe loss of traction especially under deceleration or braking or cornering and losing the tail
2) tyre explosion
02-07-2007, 01:29 PM
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Originally Posted by heinrich
Paul - the risk of overinflation is twofold:
1) severe loss of traction especially under deceleration or braking or cornering and losing the tail
2) tyre explosion
1) severe loss of traction especially under deceleration or braking or cornering and losing the tail
2) tyre explosion
02-07-2007, 01:32 PM
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Originally Posted by heinrich
What is the max tyre pressure rating of your tyre manufacturer Bill? Max permissible PSI on many tyres is 44psi. Many new tyres can bear as much as a maximum of 51psi. Are you sure that when you inflate your cold tyre to 44psi it remains under the tyre manufacturer's absolute maximum permissible pressure when it gets hot?
02-07-2007, 01:43 PM
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Originally Posted by chaadster
Bigmac already brought up the fuel economy issue, and I already said that inflation pressures are always a compromise between grip and fuel economy.Speaking of compromise -- IMHO, 44 psi is not a compromise -- though at that pressure traction will be compromised!
