Posted by Elmo P. Shagnasty on December 26, 2007, 6:40 am
bwilson4use@hotmail.com (Bob & Holly Wilson) wrote:
> > I mean, if you want to get good gas mileage and all.
>
> I drive an NHW11, 2003 Prius and have a recorded average of 52.6 MPG for
> 40,000 miles:
But you could get better.
Posted by News on December 26, 2007, 7:02 am
Bob & Holly Wilson wrote:
>
>>In fact, pumping the tires up is small potatoes in the gas mileage game
>>compared to tailgating trucks on the freeway.
>
But far less risky than tailgating trucks at a few feet or inches.
>
> You may want to visit CleanMPG.com to discuss this technique.
>
>
>>>The reduced rolling resistance pays at the pump but the steering and
>>>cornering stability is especially nice. I regularly take turns and
>>>curves at +5 to +10 mph over what other vehicles can handle.
>>
>>On highly overinflated tires?
>
>
> No, just the maximum side wall pressure.
>
>
>>My fear is that people will actually believe you and try this crap that
>>you're trolling.
>
>
> Actually, I prefer folks to give it a try. You can always go up to the
> maximum sidewall pressure and take a little test drive. If you don't
> like it, pull over and let the air out. Belief has nothing to do with
> it.
Those familiar with "Solo 2" autocross (timed runs through pylons), will
recognize that increasing street car tire inflation pressure is one of
the very first things (after cleaning out the trunk) done to improve
handling in order to reduce times.
Posted by Elmo P. Shagnasty on December 26, 2007, 7:34 am
> Those familiar with "Solo 2" autocross (timed runs through pylons), will
> recognize that increasing street car tire inflation pressure is one of
> the very first things (after cleaning out the trunk) done to improve
> handling in order to reduce times.
They also recognize that such changes are for the track, and they change
the inflation pressure back before driving home and around town.
Posted by News on December 26, 2007, 7:42 am
Elmo P. Shagnasty wrote:
>
>
>>Those familiar with "Solo 2" autocross (timed runs through pylons), will
>>recognize that increasing street car tire inflation pressure is one of
>>the very first things (after cleaning out the trunk) done to improve
>>handling in order to reduce times.
>
>
> They also recognize that such changes are for the track, and they change
> the inflation pressure back before driving home and around town.
>
Most reduce inflation pressure because of ride quality issues, not any
desire for loss of handling.
Some just refill their trunk!
Posted by Marc Gerges on December 25, 2007, 5:28 am
>
> Thanks to Google books, I picked up the following graphs from:
>
> Gyenes, L. and Mitchell, C.G.B., "The Effect of Vehicle-Road Interaction
> on Fuel Consumption," Vehicle-Road Interaction, ASTM STP 1225, B.T.
> Kulakawski, Ed., American Society for Testing and Materials,
> Philadelphia, 1994, pp. 225-239.
>
> http://hiwaay.net/~bzwilson/prius/pri_tire_010.jpg
It actually took me a minute or two to figure out the units - and even
then I'm not quite sure.
The kN/m^2 are bar. 1 bar000 Pa = more or less atmospheric pressure
Keep in mind though, that when referring to bars, one usually refers to
relative pressure. If my tire has 2 bars, it means it has 2 bars
overpressure vs the atmosphere. Therefore I'm somewhat unsure about the
graph. And I guess that's why scientists love SI units like Pa ;-)
> http://hiwaay.net/~bzwilson/prius/pri_tire_020.jpg
No real relevance - I wouldn't expect Prii to come with anything but
radial tires. I have a 40 year old classic that came with radials back
then :-)
> Tire rolling resistance is not a linear function with speed and
> inflation pressure and these charts give a clue about tire drag.
Keep in mind though that the higher the speed goes, the less important
is tire drag relatively to air resistance. Latest at quick country road
pace (100 km/h, about 60 mph) I wouldn't care so much about tire drag
and more about keeping windows closed and not having any added air
resistance. But then, a riced Prius with spoilers and the like is rather
seldom.
cu
.\arc
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>
> I drive an NHW11, 2003 Prius and have a recorded average of 52.6 MPG for
> 40,000 miles: