[s-cars] G60 brakes
tblack
Tblack5 at cogeco.ca
Mon Oct 27 15:22:19 EST 2003
Keith, Please get back into this and straighten out these guys.
Tom
----- Original Message -----
From: "Steve Marinello" <smarinello at charter.net>
To: "Richard Tanimura" <richard at tanimuras.com>
Cc: "Keith Maddock" <Keith.Maddock at trw.com>; <s-car-list at audifans.com>
Sent: Monday, October 27, 2003 1:58 PM
Subject: Re: [s-cars] G60 brakes
> Rich:
>
> Actually, I was confused. That's what happens coming into a thread in the
> middle.
>
> I was confused about the G60/BR piston sizes and wasn't on the same page
> anyway, just looking at the effective single piston equivalent of the
G60's,
> but thinking/reading that they were 44 mm + 36 mm pistons, not the two 45
mm
> pistons.
>
> By my way of looking at things, two 45 mm pistons equate to a single
piston
> cross-sectional area equivalent to a 63.64 mm single piston, using the old
> pi*D squared/4 equation, adding the two and taking the square root.
>
> By the same method, I get a single piston equivalent of 80.40 mm for the
> BR's, taking the area of two 44 mm pistons and two 36 mm pistons all
summed,
> which yields exactly your 26% cross sectional area improvement.
>
> Sorry I was a page back, and being dense.
>
> Steve
>
>
> ----- Original Message -----
> From: "Richard Tanimura" <richard at tanimuras.com>
> To: "Steve Marinello" <smarinello at charter.net>
> Sent: Monday, October 27, 2003 12:19 PM
> Subject: RE: [s-cars] G60 brakes
>
>
> > Steve,
> >
> > I may be way outta synch with everybody here.
> >
> > G60 : 2 pistons/caliper, 45 mm each according to the data given on the
> site
> > I quoted.
> >
> > Big Reds: 4 pistons/caliper, 2 x 44mm and 2 x 36 mm. This is the equiv.
of
> 2
> > x 56.8mm pistons. The math is:
> > SQRT( 44x44 + 36x36) = 56.8
> >
> > 56.8/45 = 1.26
> >
> > Rich
> >
> > -----Original Message-----
> > From: s-car-list-admin at audifans.com
> > [mailto:s-car-list-admin at audifans.com]On Behalf Of Steve Marinello
> > Sent: den 27 oktober 2003 16:01
> > To: Richard Tanimura; Keith Maddock; s-car-list at audifans.com
> > Subject: Re: [s-cars] G60 brakes
> >
> >
> > Huh?? back at you, Richard.
> >
> > I always calculated it the same way as Keith...total cross sectional
area
> of
> > the two pistons compared to the single piston, giving an advantage way
> less
> > than 26%. Could you explain your math/logic to me?
> >
> > Thanks,
> >
> > Steve
> >
> > ----- Original Message -----
> > From: "Richard Tanimura" <richard at tanimuras.com>
> > To: "Keith Maddock" <Keith.Maddock at TRW.COM>; <s-car-list at audifans.com>
> > Sent: Monday, October 27, 2003 8:17 AM
> > Subject: RE: [s-cars] G60 brakes
> >
> >
> > > Huh??
> > >
> > > The front G60 calipers are 45mm and the rear G60 calipers are 36mm.
You
> > > can't just add them.
> > >
> > > What we have to compare is 2 x 45mm with 2 x 56.8 mm (which you
> correctly
> > > calculated as the equivalent of 44 and 36). This means the Big Reds
are
> > 26%
> > > larger than the G60's which is what I originally suspected.
> > >
> > > Rich
> > >
> > > -----Original Message-----
> > > From: Keith Maddock [mailto:Keith.Maddock at TRW.COM]
> > > Sent: den 27 oktober 2003 09:36
> > > To: s-car-list at audifans.com; richard at tanimuras.com
> > > Subject: Re: [s-cars] G60 brakes
> > >
> > >
> > > Rich,
> > >
> > > I should have worded my statement a little bit better.
> > >
> > > I said:
> > > "G60's have two pistons with the same effective size as an about 60mm
> > > piston."
> > >
> > > I should have said:
> > > "G60's have two pistons that together have the same effective size as
> one
> > > approx. 60mm piston."
> > >
> > > Looking at the data from Jimmy's site, it should be more accurate to
say
> > > that the two pistons together (45mm & 36mm) are the same effective
size
> as
> > a
> > > single 57.6mm piston.
> > > Perhaps they should have called it the G58 instead of the G60 !
> > >
> > > Regardless, to my original point, this is still larger than Big reds,
> with
> > > 44mm and 36mm pistons, which together are the same effective size as
a
> > > single 56.85mm piston.
> > >
> > > Thanks for pointing this out.
> > >
> > > Cheers,
> > > Keith
> > >
> > >
> > >
> > > Keith Maddock, TRW Automotive, Koblenz, Germany
> > > Slip Control Systems, Systems Design, Traction Control
> > > +49 (0)261/ 895 2474 - - keith.maddock at trw.com
> > >
> > >
> > > >>> "Richard Tanimura" <richard at tanimuras.com> 21:43:52 25.10.2003 >>>
> > > Keith Maddock stated on this list that the G60 had 60mm pistons. I
> > stumbled
> > > over this information on
> > > http://www.urs4.com/technical/brakes/UrS4_brakes.html which indicates
> this
> > > might be incorrect.
> > >
> > > I am not in the least interested in being picky. Keith has helped me
> > > enormously in the past. But incase the data is important to someone, I
> > > suggest atleast that they double check the data.
> > >
> > > Rich
> > >
> > >
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