[s-cars] 16" Avus wheels and ECS Stage 3

[joe.pizzimenti at gmail.com]

So it doesn't affect the stopping distances unless it does.

Gotcha.

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-----Original Message-----
From: Taka Mizutani <t44tqtro at gmail.com>

Date: Wed, 16 Sep 2009 14:20:56 
To: Jim Gates<jim at gates-home.com>
Cc: <s-car-list at audifans.com>
Subject: Re: [s-cars] 16" Avus wheels and ECS Stage 3


It doesn't affect your stopping distances for one stop, except that better
modulation of the brakes will allow you to brake harder without lockup,
which will improve stopping distances. For repeated stops or stops from very
high speed, the larger rotor and thus larger heat sink will make a
difference.

There was a thread recently on corvetteforum about a guy who had brake
issues even doing one stop from 180mph.

Better tires will make a big difference in stopping distance- just saying
that you can lock up a crappy set of tires means nothing. I can lock up the
snow tires on my Miata in the dry pretty easily- that doesn't make the
stopping distance with those tires any good. Now I can't lock up the RE-01Rs
unless I try really hard. Stopping distances are much better with those
tires, due to superior traction of the tires.

Taka


On Wed, Sep 16, 2009 at 1:44 PM, Jim Gates <jim at gates-home.com> wrote:

> This discussion brings up two things that I've been pondering for a while.
> The torque leverage of a larger rotor and pressure applied to the disc
> would
> really only help with brake feel (pedal pressure and modulation) and not
> actual stopping power, correct?  Larger rotors and pads have a higher heat
> sink capacity and allow more repeated stops without fade.  Also correct?
>
> Actual stopping distances will depend almost solely on the tire/road
> interface based on locking the tires up, right?  Therefore tires determine
> stopping effectiveness in a much larger degree than the size of the
> brakes...???  So, bigger brakes would be beneficial for the track where
> large amounts of heat dissipation are required but not necessarily on the
> street.  If you can lock up your brakes (or activate ABS) you are not going
> to stop any quicker in a normal street braking event with bigger brakes.
> They may feel better and allow you to apply less pressure to the pedal but
> they don't really allow you to stop any quicker.  Someone explain the
> physics to me if I'm off.
>
> Jim
>
>
> Steve-
> I don't know- the greater brake torque of the larger rotor would help. I
> have not researched this stuff any further than circa 2002 or 2003 because
> I
> have not had my 200 since late 2004.
>
> I think that larger rear rotors is a waste of money- they don't do that
> much
> of the braking as it is.
>
> When you say stock caliper, I take that to mean a 993tt caliper with a
> larger rotor (larger than the 322mm stock rotors, right?).
>
> Do you really need that much larger of a brake rotor? I would look at
> improving traction before doing that unless you're fading Big Reds with
> race
> pads and fluid.
>
> Taka
>
>
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