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RE: [VWC] Aftermarket differentials Braking
Why extreme downshifting? And how would it help slightly?
Clutch-type differentials can be tuned so that you can vary the amount of lock
under accelearation compared to braking. If you own a Playstation and Grand
Tourismo, you can actually play with this if you have purchased the racing
transmission/differentials for your car.
I know less about how Torsen-style diffs act under braking, but I have to
believe that they can be similarly tuned by changing the shape of the ramps.
However, Brian, I can definitely say that there is a very important difference
between the wheel the wheel speed and the load applied. They are NOT related.
Torsens apply power to the more heavily laden wheel under acceleration, NOT the
one that is spinning slower. In many cases, the wheel with traction is moving
slower, but not always. And in fact, if there is no load (or nearly none) on
either wheel, a Quaife/Peloquin/Torsen will become a completely open
differential. In this case, the slower wheel does not receive any engine torque
at all...it will leave a single stripe of rubber just like an open diff. If I
corner hard enough to take all the weight off the inside front wheel as I hit
the gas, I can spin that inside front wheel like crazy until I back off or
straighten out the wheel and get enough load back on that tire.
Presuming a Torsen works the same in braking as in acceleration (again, this is
NOT a safe presumption, as it is probably tunable by the manufacturer), it
would even out braking force between the wheels as long as both wheels have
some traction. But when a wheel is locked under braking, it would essentially
open the diff up because there would be no load on the locked wheel.
Neal
'77 Scirocco
--- Peter <peter@thescirocco.com> wrote:
While braking, I think a diff might slightly help during extreme
downshifting.
Isn't keeping the trans from grenading, and the handling improvement @ WOT
enough for you? ;)
Give Gary Peloquin a call, he's a real good guy and usually entertained by
calls like this, 706.613.5339.
Let us know what he says...
Peter
http://thescirocco.com/
Please! Include the previous text in your reply...
-----Original Message-----
From: scirocco-l-bounces+peter=thescirocco.com@scirocco.org
[mailto:scirocco-l-bounces+peter=thescirocco.com@scirocco.org] On Behalf Of
Brian Haygood
Sent: Wednesday, March 30, 2005 11:41 PM
To: jdbubb@ix.netcom.com; scirocco-l@scirocco.org
Subject: Re: [VWC] Aftermarket differentials Braking
On the diff subject, will a limited slip diff work to equalize braking as
well as forward traction?? Might have to ask the Pelican himself on that
one. It's been a couple of years since I played with a Torsen, but just
from fiddling with it in my hands, it seemed as though it wouldn't. Since
they bias the torque to the outside wheel in forward motion (i.e. the faster
wheel), the slowest moving wheel gets a sort of free ride. In braking this
would mean that a wheel that locks up would get the same metaphorical free
ride. I'm sure there is some resistance there, and surely more than an open
diff, but I'm wondering whether it really does its proper LSD action in
braking. Anyone?
BH
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