[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]

Re: Understanding

QSHIPQ writes:
>I'm thinking that if you can tie one wheel to another, does it have 
>to be on the same drive axle?  Center EDL?  Maybe the definition, 
>but I know that NOT to exist.

But on 03/04/98, I wrote: 
[wavy lines indicating a flashback]
>> I _think_ (somebody correct me if I'm wrong) that EDL works as 
>> two separate systems: one front EDL, and one rear EDL.

And QSHIPQ responded:
>I don't think your assumption to be correct.  Since EDL is 
>Electronic Locking Differential, I presume front to rear to be 
[wavy lines indicating a return to the present]

So which is it? Do you now agree with me when I say that EDL on 
the new Qs acts as two separate (front and rear) systems? You now 
know that your previous assumption does NOT exist?

>And I don't want any action taken AT the front wheels for obvious 
>reasons.  But the data there is important to what I do want to happen 
>at the rears.  Help any?

As I've said before, if your going to go that far, why not ditch the 
torsen all together?

>On full throttle the rear axle would be slowed by EDL to never 
>exceeed the front axle speed.  No torque transfer thru the turn.

So you never want the rears going faster than the fronts, huh? Well, 
before EDL can react, the rears must at least begin to spin a _little_ 
faster than the fronts. At that point, Tshift to the front has already 
happened. EDL applies the rear brakes, thereby grabbing some of 
that power to generate heat. No torque transfer, you say? In fact, I 
can see torque oscillations as EDL slows, then releases (then slows
again, etc.) the rears through the turn.

It seems that you are trying to take the scientific high road with 
your "physics" argument. Well, let's follow it through using the 
scientific method. You have documented an event, and come up 
with an hypothesis. In order for it to graduate to a theory, you 
have to come up with a repeatable experiment so that the rest of 
us can verify your results. How about a step-by-step recipe for 
spider stew?

Others have tried to recreate the "bite" without success. You 
shrug it off as a "non event." Not a very scientific response. I 
have already suggested hooking up a laptop to the ABS sensors 
to see what each wheel was actually doing during the "bite." Not 
much interest in that one, I guess. It seems that you have lost a 
bit of objectivity in response to the (frequently unjustified) 
attacks of your findings. You ask people to argue the physics 
with you. I argue that you have some homework left to do before 
we can accept your hypothesis. 

The simple formulae do indeed show that Tshift happens. No 
argument there. Plugging in numbers to come up with values 
for the shift is monkey-work. It demonstrates nothing more than 
whether or not you have one of the flawed Pentiums. Proving 
that Tshift is the source of your "bite" is the real issue here.

Eric Renneisen (not quite succumbed to the dark side, yet)
'90 CQ 20V  -  my 'racing-iron'  ;^)
Chattanooga, TN