[V8] More Auto vs. Manual differences???

Wed Mar 26 15:23:49 PDT 2008

Yeah, I disagree with Tire Rack.  I do way more tire "research" on TR
than probably anybody.

The stock tire size is always my baseline.
It calculates out to 25.16 inches or 639mm.

This leaves us with some odd sizes as _direct_ replacement like 205/50-17 and
235/50-16.

235/45-17 = 643.3 = 25.33
225/45-17 = 607.5 = 24.97

In my vast experience (and I'm not trying to exagerate) in searching
Tire Rack, I firmly believe their recommendation of 235/45-17 is
tilted by the load rating.  Some 225/45-17's have a lower load rating
than the recommended stock size of 215/60-15 typically has.

There are the XL sizes which bump the load rating, but the 235/45-17
has a high enough load rating before any XL sizing.

So I believe that's why TR goes with that size.  It's not just for
diameter, because there are closer matches _sometimes_ with other
sizes only if they are XL'd.

Ed

On 3/26/08, Dag Bøsterud <dag.boesterud at consulgranada.net> wrote:
> Audi lists the following tires for the V8 Quattro:
> 215/60-15 - 7,5 x 15
> 225/50-16 - 8 x 16
> 245/45-17 - 8 x 17
>
> All these are summer tires of course.
>
> /Dag
> 92 V8 4.2
> 202 000 miles
>
> ----- Original Message -----
> From: "Ron Wainwright" <ron_01056 at yahoo.com>
> To: "Ed Kellock" <ekellock at gmail.com>
> Cc: <v8 at audifans.com>
> Sent: Wednesday, March 26, 2008 11:05 PM
> Subject: Re: [V8] More Auto vs. Manual differences???
>
>
> 235/45's is whats called for on tireracks web site.
>
>  & yeah...my speedo was @ 80 & he said I was going 86.
>
>  As far as the tach....it was reading correct. Since I
> have so little to do I swapped out the IC into an Auto
> V8 it read as it should have. It was just off a bit in
> my 5sp V8.
>
>  Ron
>
> --- Ed Kellock <ekellock at gmail.com> wrote:
>
> > Actually 235/45s are a bit taller than stock which
> > would make the
> > speedo read a bit low, but not enough to account for
> > the difference
> > you're reporting... you were indicating 80 and the
> > cop said 86?  Is
> > that right?
> >
> > For the RPM reading to be off there's really no
> > other explanation than
> > a calibration issue.
> >
> > Ed
> >
> >
> > On 3/26/08, Ron Wainwright <ron_01056 at yahoo.com>
> > wrote:
> > > 17 inch "01" S4 rims with the correct tire
> > 235/45's.
> > >
> > >  RPM's were off as well.
> > >
> > >  Ron
> > >
> > > --- Ed Kellock <ekellock at gmail.com> wrote:
> > >
> > > > What size tires were you running that day?
> > > >
> > > > Ed
> > > >
> > > > On 3/26/08, Ron Wainwright <ron_01056 at yahoo.com>
> > > > wrote:
> > > > > Funny you ask..well one day I get pulled over.
> > I
> > > > see
> > > > > the lights...but I say "no way are they for
> > me",
> > > > > even though I'm going 80mph. The car kinda
> > blends
> > > > > in...know what I mean...LOL!
> > > > >  So the guy tells me I'm doing 86 in a 65. I
> > think
> > > > > he's gotta be wrong...but he wasn't. I tell
> > him
> > > > the
> > > > > whole story about changing the IC out
> > ect....he
> > > > did
> > > > > cut me a bit of a break.
> > > > >  So "in my experience" the Auto speedo isn't
> > > > correct.
> > > > >
> > > > >  Ron
> > > > >
> > > > > --- urq <urq at pacbell.net> wrote:
> > > > >
> > > > > > ... not to be contrary, but the auto IC
> > seems to
> > > > > > work just fine in #344 ...
> > > > > > and I looked, both speedos have the same
> > > > conversion
> > > > > > factor (6155 if memory
> > > > > > serves).  Why do you think they are
> > different?
> > > > > >
> > > > > > Steve B
> > > > > > San José, CA (USA)
> > > > > >
> > > > > > -----Original Message-----
> > > > > >
> > > > > > The Auto's speedo won't show your true MPH
> > in a
> > > > 5sp.
> > > > > >
> > > > > >  Ron
> > > > > >
> > > > > >
> > > > > >
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