"Inflation pressure does not affect grip": Autospeed article.
Except in aquaplaning where higher inflation reduces it.
Something I suspected but didn't have the info to back it up. AutoSpeed - Tyres, Grip and All That. Quote:
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According to these tests Higher inflation pressure reduced stopping distance and increased coefficient of friction...Scroll down for stopping distances. FEA chapter III. tire pressure survey and test results From NHTSA Passenger van tire inflation study. Quote:
Found some interesting pages from a racing tire book. I have not had time to read the whole thing. From excerpt#1 Quote:
Tire Technology, excerpt from The Racing & High-Performance Tire From excerpt #2 Quote:
Tire Technology, excerpt no. 2 from The Racing & High-Performance Tire Tire Technology, excerpt no. 3 from The Racing & High-Performance Tire SAE paper digested for us by Barry. Barry's Tire Tech Peak traction goes up and sliding down a tiny bit. ABS would like this. Also they found cornering response and cornering traction improves. The only downside was bruise resistance and puncture blow out got worse with higher pressure (not surprising.) http://www.barrystiretech.com/sae800...tiongraphs.jpg This is not advice. I'm just sharing waht I have found. My personal opinion is that tire inflation to max sidewall is generally better for the following reasons: 1) Lower heat build up. Reduced risk of accident or rollover resulting from loss of control from heat related tire failure. 2) Reduced wear 3) Slightly increased peak traction, slightly reduced sliding traction. Slightly reduced stopping distances (may have to do with increased traction) 4) Reduction in hydroplaning (onset of hydroplaning happens at a higher speed) 5) Reduces slipping in snow* (depending on conditions, sometimes lower pressure is better) 6) Increases tire responsiveness in cornering. 7) Reduces body lean in cornering, improves steering feedback (subjective) 8) Reduces fuel consumption 9) Reduces steering effort Downsides to max sidewall: 1) Slightly harsher ride quality. 2) May increase rollover tendency in already rollover prone SUVs 3) Harder on suspension components in rough road conditions 4) Increases risk of tire bruising or failure from impact with certain objects. |
Heat, Now I get it (wide).
Thank you! |
Cool link/info!
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In fact, according to these tests Higher inflation pressure reduced stopping distance and increased coefficient of friction...Scroll down for stopping distances.
FEA chapter III. tire pressure survey and test results Unfortunately, higher pressures were not tested. Quote:
FEA chapter III. tire pressure survey and test results |
Orange4boy, thanks for a new weapon in the EcoModder arsenal :)
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tire company in cahoots with oil company to keep making wasteful rollers?
I would run at 90 psi If they would wear evenly. screw ride comfort built into tires, thats what the suspension is for. |
I wonder why the tire companies consistently disagree with this...
Edit: Something to note, this article seems to have no empirical testing, which I think is important in this kind of situation. Issues related to tires and fuel economy can often have the books cooked via mental exercises, which, while seemingly sound, are crucially lacking various pieces of the puzzle. Colour me skeptical. |
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Fact or Fiction? Tire contact patch and air pressure. That directly contradicts Item #1 - and has data to back it up. So it isn't a myth! 2) In item #2, they go with the classic friction formula F = µN. Unfortunately, that does not apply to tires. Tires get a lot of their grip by penetrating the macro texture of the pavement. When pushed to an extreme, the rubber is torn off the tire - with subsequent increases in force. As a result, it is possible to get more than 1g forces. If you read up about drag racing, you''ll find reports of well in excess of 1 g acceleration. You'll also find some skid pad testing over 1 g of regular production cars - albeit high performance cars like Corvettes. So, the whole article seems built on an incorrect series of assumptions. |
You know, that is the exact reason why the standard for TPMS makes no provision for an upper pressure warning. It was determined it does not constitute a significant safety hazard.
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Possibly not relevant to on-road discussions, but with regards to off-highway driving on extremely rough surfaces anyone who says inflation pressure doesn't affect grip can stop talking immediately if not sooner.
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