Insane speed in german cars... [Maxima] (+ tire slip and stuff)

[amalventano@sc.rr.com (Allyn)]

yes, 'slip'. its not as if the tire is actually losing traction, because its
not. each tread block hits the road and doesnt move till it rolls back away with
the tire. in tech tire talk, the term 'slip' also describes tire compliance. as
each new section of tread comes in contact with the road (initially under no
load), and is then forced to convey the (whatever) hp that it needs to, that
section gives a little bit. this continuous 'give' results in the inner bead of
the tire actually spinning faster than the outer tread is spinning (this is only
true at the bottom arc that contacts the road). once the tread leaves contact
with the road, it goes back to its original position.
Al

----- Original Message -----
From: "Jason" <jason@scirocco.org>
To: "Allyn" <amalventano@sc.rr.com>; "Robert Piwonka" <tpiwonka@ttacs.ttu.edu>;
<scirocco-l@scirocco.org>
Sent: Wednesday, November 06, 2002 4:21 PM
Subject: Re: Insane speed in german cars... [Maxima] (+ tire slip and stuff)


> At 04:08 PM 11/6/2002, Allyn wrote:
> >** an important note is that even with an accurate speedo, going for top end
> >results in increased slip at the driven wheels (due to compliance of the
> >rolling
> >rubber itself). speedos are linear, but the effect of slip is exponential
> >(follows effect of wind resistance). at <85 or so, the slip is still
> >small, but
> >becomes large enough at the limit to throw indicated speed off by as much as
> >10-15%, depending on the type of tires.
>
> Hey Al,
>          Slip?  Not sure I follow you... Slip between pavement and tire?  I
> hope not at 140mph! :)
> Jason
>
>
>
>
>
> >hth
> >Al
> >
> >
> >----- Original Message -----
> >From: "Robert Piwonka" <tpiwonka@ttacs.ttu.edu>
> >To: <scirocco-l@scirocco.org>
> >Sent: Wednesday, November 06, 2002 12:48 PM
> >Subject: RE: Insane speed in german cars... [Maxima]
> >
> >
> > > Ok let em clarify the downhill section was through a turn as well and top
> > > speed was not reached there but in the half mile strait following(this was
> > > flat).  Also this was a maxima se... different engine than just the v6
> > > maximas.  I feel the speedometer is more accurate than a scirocco one :)
> > > Maximas are fast cars for those of you who have not ridden or driven in an
> > > se.
> > >
> > > Robert Piwonka
> > >
> > > -----Original Message-----
> > > From: scirocco-l-admin@scirocco.org
> > > [mailto:scirocco-l-admin@scirocco.org]On Behalf Of Jason
> > > Sent: Wednesday, November 06, 2002 9:46 AM
> > > To: Robert Piwonka; scirocco-l@scirocco.org
> > > Subject: RE: Insane speed in german cars... [Maxima]
> > >
> > >
> > > At 12:16 AM 11/6/2002, Robert Piwonka wrote:
> > > >I have not been following this topic but since we are talking about top
> > > >speed a 92 maxima se 5 spd can do 145MPH stock.  This was down hill into
a
> > > >flat staight and assuming the speedo was correct(no reason it shouldn't
> > > be).
> > >
> > > Many speedometers are quite off, and get more so at higher speeds
> > > unfortunately.... even on new cars with electronics.  C&D actually did a
> > > nice report about this a few months ago...
> > >
> > > The reason is essentially that the law insists that speedometers do not
> > > read _low_.  They can read up to 7% high up to 85mph IIRC.  That would
> > > probably mean around 12% high at 120mph, or an indicated 134mph FWIW.
> > >
> > > I thought the V6 Maximas were limited to 131mph though... (H-Rated tires)
> > >
> > > Either case, top speed downhill doesn't exactly mean "top speed". :)
> > > Jason
> > >
> > >
> > >
> > > _______________________________________________
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> > >
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