rspec sedan tire pressure

[nadel]

i have increased the front tire pressure 2lbs and rear 3lbs. (using digital tire pressure gauge). the handling has dramatically improved. slightly stiffer ride but not uncomfortable. try it see what u think

 

[shagnat]

Should we use the car manufacturer's recommendation for air pressure, or use the tire manufacturer's recommended air pressure?

 

[NSXNEXT]

Should we use the car manufacturer's recommendation for air pressure, or use the tire manufacturer's recommended air pressure?

Always the car's specs. Tires are generic and fit many cars.

 

[shagnat]

Always the car's specs. Tires are generic and fit many cars.

That's the way I was thinking. Just wanted to verify.
Thanks!

 

[DRS]

Generally for max dry handling, gas mileage, and load carrying (passengers and bags), use max cold inflation. Or a few lbs under.

Depending on tires, the 5.0 suspension will mostly under steer. Be at max cold in front (or a few links below) and 2-4 lbs less in back. Unless fully loaded Witt people and stuff. Then max all the way around.

Cold Winter, recommended pressure. Unless tons of pot holes then many say to keep pressures up to protect the rims. Even with less traction.

I have experienced in my 5.0 that if I am at 42 I'm front, 40 in back, the tires contact zone is equal when looking at the road after the tires roll over it in the rain. Using the recommended pressure has the outside if the tires contact patch driest, and middle more wet. That is not good for rain. And also gives a idea how the tires will wear.

With pressures higher and gentle driving, the edges if the tires will wear out slower than the main tire patch. Not much, but slightly.

Mileage can increase more than 1mpg higher depending on car/truck. And tires run much cooler at the pressures at or just below max cold pressure.

My .02.

 

[DRS]

The pressure mix above also helps rid the understeer yet keeps the back in predictable.

 

[Potty_Pants]

i have increased the front tire pressure 2lbs and rear 3lbs. (using digital tire pressure gauge). the handling has dramatically improved. slightly stiffer ride but not uncomfortable. try it see what u think

+1

factory PSI recommendation is horrible. my car was drifting around the turn with stock psi. actually scary.

bumped it up similar to yours and it was night and day change.

ppp

 

[Vince2]

I'll bet the pressure thing is a compromise....feels better but handles worse. I drove my new car from the dealer and one of the first things I checked was the tire pressure: they were all at least 7 lbs over (average 40). They look better with more pressure (less sidewall sag) and handle better. Read some of the suspension mod threads here and a common theme is apparent: oh yeah, you can get it corner flat as a go kart but you will not be happy driving it through traffic every day. I think this is why the OE Dunlops are so universally panned. They are an "enthusiast" tire for someone willing to put up with noise and harsh ride for better grip. Read a BMW forum and the owners with the run flat tires just hate them. The big issue with the run flats is that they are too harsh and unforgiving. One man's mean, ground hugging driver is another man's punishing buckboard.

 

[Mark_888]

Another consideration is stability of the vehicle. Even though handling may be somewhat improved with more tire pressure, at some point the vehicle is more prone to rollovers if tires are over-inflated too much.

This is what happened with the Ford Explorer - Firestone 500 tire fiasco. The Ford Explorer SUV was prone to rollovers, so Ford lowered the recommended tire pressure to combat that, and that caused the Firestone 500 tires to fail with blowouts because the Ford recommended tire pressure was just too low for that much weight on the tires. Obviously, a sedan is less prone to rollover than a SUV, but there is such as thing as too much tire pressure.

 

[DRS]

The Genesis is no narrow track, solid axles F/R, top heavy SUV. Roll over us not an issue.. And the full authority stability control would not let that happen anyway.

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[Mark_888]

The Genesis is no narrow track, solid axles F/R, top heavy SUV. Roll over us not an issue.. And the full authority stability control would not let that happen anyway.

I would bet that there a few people on this forum who could flip a R-Spec.

 

[shagnat]

The Genesis is no narrow track, solid axles F/R, top heavy SUV. Roll over us not an issue.. And the full authority stability control would not let that happen anyway.

SOLID axles f/r??? Maybe I don't understand what "solid axles" are, but, I thought with 4 wheel independent suspension there couldn't be a solid axle.
Clarification, please.

 

[DRS]

SOLID axles f/r??? Maybe I don't understand what "solid axles" are, but, I thought with 4 wheel independent suspension there couldn't be a solid axle.
Clarification, please.

The Explorers mentioned in the "rollover" issue when the tires exploded due to too low air pressure, were solid axles front and rear (4WD) for those years mentioned in the rollover cases. It is also reported that Ford recommended the lower air pressure to prevent roll overs by limiting traction (caused by lower air pressure) to prevent rollovers during emergency maneuvers. Again, this was only on the older solid axle designs. Later on when then came out with a newer platform, they went to independent suspension. And wider track.

When people did not check their tire pressures, and the already lower tire pressure went down too low (somewhere at 20lbs or below), in hot highway speeds like Florida (most of the reports were on highways going fast on hot pavement), the tires would explode in the rear and cause a roll over if they driver jerked the wheel.

Does this help?

 

[Medusa]

I find that factory tire pressures are largely a compromise between comfort and handling, with emphasis on comfort. I have experienced better handling and "feel" with a general increase in factory pressures by 2 PSI.

 

[EXBMWGUY]

I find that factory tire pressures are largely a compromise between comfort and handling, with emphasis on comfort. I have experienced better handling and "feel" with a general increase in factory pressures by 2 PSI.

I agree, and typically increase 2-3 psi when doing a road trip. Ride for me is fine with the OEM ContiPro tires at increased pressures on all but those highways with the most extreme, teeth-rattling expansion joints.

 

[DRS]

Agreed. Sometimes a bit higher than 3lbs is better. Depends on car and how low they go on the recommended tire pressures.

 

[1FstYota]

I've always played with it until I like how it rode and handled. You can always check wear on the tire to see if its over or under.