86 5ktq in rally cross!

[Kurt Deschler]

Sounds like a WGFV rigged to the diff lock solenoids actuated from the WOT
switch would fit the bill. Hopefully the diff would have a chance to lock
before the turbo started to spool. Might want to hook to the cruise pump
for more reliable vacuum source.

	-Kurt
	'87 5kcstq
>
> Message: 7
> Date: Tue, 10 Feb 2004 13:02:00 -0800
> From: Dan Cordon <cord4530 at uidaho.edu>
> Subject: RE: 86 5ktq in rally cross!
> To: Quattro List <quattro at audifans.com>
> Cc: Stephane.Livolsi at investorsgroup.com
> Message-ID: <402946C8.8010106 at uidaho.edu>
> Content-Type: text/plain; charset=us-ascii; format=flowed
>
> > On snow and ice, you SHOULD be able to get the car to rotate, so I'd keep
> > the diffs locked.
>
> Actually, I've done quite a bit of *ice auto crossing* this winter
> during each of the big snow dumps we've had here. There's a particular
> parking lot that's great for oval racing (alone, that is). I've been
> trying to learn more how the car responds with each of the diffs locked.
> I'd run about 20 laps open, 20 with center locked, and 20 with both
> locked, then repeat in the opposite direction.
>
> That said, with both diffs locked the car really wants to go straight.
> Getting the initial turn in is difficult at best. However, once the turn
> is initiated, I felt like having both diffs locked made it easier to
> control the drift.
>
> Even having just the center locked made the initial turn in slightly
> harder, but nothing compared to having the rear locked.
>
> I would consider putting a switch on the throttle if possible. Something
> where any more than ~50-70% throttle would engage the vacuum locks. When
> you go below that, it would disengage. This way when you're giving it
> throttle as you exit the corner you'd get the locked diff traction, but
> off the throttle entering a corner you'd be fully open.
>
> Not having thought much about this, I'm not sure on the details of where
> you'd want to mount such a switch.
>
> FYI, this was in my 87 5k that I was playing around with. Good luck with
> the races!
>
> --
> Dan Cordon
> Mechanical Engineer
> University of Idaho - Engine Research Facility