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

Wed Mar 26 15:36:28 PDT 2008

Height = diameter.  Any variation there affects speedometer reading
and final drive ratio.

I forgot one that is almost dead on the stock diameter.   255/40-17.

Coincidentally the 255/35-18 works out to exactly the same diameter,
so you're good to go with those.

265/35-18 bumps you up 1% in diameter which will cause a 1% speedo
error, which will make it read 1% lower than with stock size tires.

With 275's, even going to 30-series tires will put you a good bit too small.

On 3/26/08, Ron Wainwright <ron_01056 at yahoo.com> wrote:
> So then what is the recomended tire size for 18's? I
> got 255/35/18's on my LM's. I plan on 265...or dare I
> say 275.
>  Now what is a concern is the height of the tire. I
> run 35's on my lowered V8 5sp & the tire is very close
> to the arch were the rear door is. All the suspension
> is brand new...so it's not a bushing issue.
>  I'm afraid if I go with a 40 height it's going to
> rub.
>
>  Who's running 18's out there...& what size tires &
> brand you got?
>
>  Ron
>
> --- Ed Kellock <ekellock at gmail.com> wrote:
>
> > 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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