05-05-2011, 05:41 PM
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#1 (permalink)
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Cyborg ECU
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Intro to Rolling Resistance
Looking for more information on lrr tires for my upcoming purchase, I found and watched the below video. It is a very simple introduction to the basics of rolling resistance in tire design and so maybe it will be useful for you too:
james
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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The Following User Says Thank You to California98Civic For This Useful Post:
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05-05-2011, 05:51 PM
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#2 (permalink)
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...beats walking...
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...it's all about the new "special polymers" used.
Last edited by gone-ot; 05-06-2011 at 03:37 PM..
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05-05-2011, 10:42 PM
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#3 (permalink)
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EcoModding Apprentice
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So, my summer tires are bald on my VW tdi. Now what?
The factory MXV special energy michelins are now very extremely bald. The factory replacement is pretty spendy. $121 ea. Wet road performance was unimpressive and winter performance was noticeably awful.
The goodyear version in the new special compound is significantly cheaper at 90 and maybe some rebate money. Online reviews of wet wet/snowy weather performance are pretty good.
So, Anybody know of data to compare actual rolling resistance between these two tires?
Thanks in advance,
troy
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2004 VW TDI PD on bio
want to build 150 mpg diesel streamliner.
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05-06-2011, 03:47 PM
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#4 (permalink)
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...beats walking...
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...did anybody else notice these two inconsistencies?
1) especially at the end of video how one ball (the "new" compound) always came out of the "launch box" faster/sooner than the other ball?
2) how the "old" compound ball ran out of movement just prior to the crest of the roller coaster so it never makes it to the end of the roller coaster, which visually makes the "new" compound appear to roll further...which is true, but only because it crested the first rise and has the 'new' down hill slope to roll down. The samething (new down hill slope) happens with the truck demo.
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05-06-2011, 05:32 PM
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#5 (permalink)
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The road not so traveled
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Add to that the balls dont roll on the bottom of the track, but on the sides of it. Friction between the ball and the side of the track will come into play which would have nothing to do with actual rolling resistance.
Lots of marketing hype.
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05-06-2011, 05:40 PM
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#6 (permalink)
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Cyborg ECU
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Quote:
Originally Posted by Old Tele man
...did anybody else notice these two inconsistencies?
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I didn't notice... but true. Great critique, hey.
__________________
See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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05-06-2011, 06:07 PM
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#7 (permalink)
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Master EcoModder
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Quote:
Originally Posted by Old Tele man
2) how the "old" compound ball ran out of movement just prior to the crest of the roller coaster so it never makes it to the end of the roller coaster, which visually makes the "new" compound appear to roll further...which is true, but only because it crested the first rise and has the 'new' down hill slope to roll down. The samething (new down hill slope) happens with the truck demo.
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Good call. Should have been a straight track. |
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05-06-2011, 06:15 PM
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#8 (permalink)
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Master EcoModder
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Michelin demonstrated their point with 2 real cars on different tyres, rolling back and forth in a half-pipe.
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Strayed to the Dark Diesel Side
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05-06-2011, 08:56 PM
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#9 (permalink)
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EcoModding Apprentice
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The local NTB guy here likes the michelins (energy/primacy) quite a bit better than the goodyears. He's too much of a salesman for me to buy everything he says, but he does seem to know a good bit about tires as well.
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05-07-2011, 12:48 AM
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#10 (permalink)
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...beats walking...
Join Date: Jul 2009
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...I did tank/automotive testing for 10 years at U.S. Army Proving Ground, Yuma, AZ.
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