11-10-2013, 11:59 PM
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#38 (permalink)
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Cyborg ECU
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,299
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Quote:
Originally Posted by Old Tele man
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Yes, quite cool. I also foundthis post by you a couple items downin the same thread. It's also very interesting:
Quote:
Originally Posted by Old Tele man
...a tires' revolutions-per-mile (rpm) number are measured at 45 mph test speed and its rated load capacity, but that number varies with changes in speed and/or load. ...for example, below are the speedometer-vs.-actual results for my '70 AAR 'Cuda (S=speedometer; A = actual):
S = 100.0 mph, A = 102.0 mph, or 2.00% high.
S = _90.0 mph, A = _91.5 mph, or 1.67% high.
S = _80.0 mph, A = _81.2 mph, or 1.50% high.
S = _70.0 mph, A = _71.0 mph, or 1.43% high.
S = _60.0 mph, A = _60.5 mph, or 0.83% high.
S = _50.0 mph, A = _50.0 mph, or 0.00% no error.
S = _40.0 mph, A = _40.0 mph, or 0.00% no error.
S = _30.0 mph, A = _29.0 mph, or -3.33% low.
...thus, tire "error" is not static, it gets bigger above & below 45 mph!
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The GPS reported my average speed about 51 mph across the 112 mile trip today. But I wonder if this table applies to steel belted tires.
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.
Last edited by California98Civic; 11-11-2013 at 12:04 AM..
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