Re: More Ads

[QSHIPQ@aol.com]

In a message dated 98-10-21 13:52:10 EDT, you write:

<< 
 But this was all before Torsen and ABS.  What's the date on your paper?
  >>
I have more than a few, the quote on that one was dated 1988.  Doesn't change
fast forwarding to the later papers.  Understand what a torsen and ABS is all
about.  It is all about not transmitting torque to the wrong axle while
braking, something VC's have been known to do.  What a torsen and abs is
"trying" to do is overcome very poor braking chassis distribution with engine
overrun torque being transfered rearward to delay the onset of lockup (or abs
function).  Look at the percentage of overun torque we are talking about here
in terms of total braking force (engine braking/ braking front+ braking
rear+engine braking).  The problem is weight distribution under braking.  The
Torsen design answer is to make sure that the torsen torque distribution is
equal or greater than the actual braking distribution.  If a torsen doesn't do
this, then it actually will hinder braking ability for given hardware and
brake force distribution.  78/22 torsen split was chosen for a reason.  That
is almost exactly the full on laden braking force distribution of a quattro.

Take some of those graphs in the papers, and insert a 50/50 weight
distribution for the model.  Amazing how the relative brake slip front and
rear are almost equal, even without a torsen.  

The argument is that a torsen with abs can get as close to an open
differential with ABS under braking.  Few of these papers address weight
distribution.  They are given.  I see the project being simpler than that.
You still have a chassis dynamics problem.  You can get close to the ideal
braking force with a torsen and abs on a quattro.  Given a quattro, and all
it's forward weight.  Problem.  When 80% of the braking is done with the front
wheels, that ideal might be a little less than one would think.  And certainly
a lot less than a lot of better balanced cars under braking.  20%, that's not
a lot of weight or contact patch in the rear.  

Controversal?  Why?  I think it to be really simple, this whole braking thing.

I liked the post that size matters, it's so true.  You want to gander at a car
that has good balance under braking?  Look to the rear.  Unfortunately, audi
only made one that qualifies there.  And the RS2 doesn't need the same brakes
in the rear as the front.  It just looks better.

Scott