[s-cars] Re: WRX (was NAC, but more turbo content)

[Stephen Redford]

Keith ,  what do the WRX  STi versions , U.S. &  Japan / European ,  versions have for a center diff. , and how is it different from the ' standard ' Viscous center diff. ?  Also , what kind of front / and or / rear  differentials  does the WRX have .   Thanks ,   Stephen Redford  '85urq u.s. version
----- Original Message -----
From: "Keith Maddock" <Keith.Maddock at trw.com>
To: <skippertgore at hotmail.com>
Cc: <s-car-list at audifans.com>
Sent: Monday, January 13, 2003 2:32 PM
Subject: [s-cars] Re: WRX (was NAC, but more turbo content)


I sat in a WRX at the Detroit Auto Show in 2001 when I was trying to decide between UrS4, S4tt, and WRX as a replacement car for my 91 200q20v.

The S4tt felt cramped for me, and even the S6 2.7T felt less than perfect.  The WRX was an extremely tight fit.  After spending 8 years in a Legacy, I'll never buy a car again that I feel cramped in.  (I have longer-than-average legs even for my  6'4" height)

RE AWD:

Manual Subies (excluding STi varieties) have a Viscous limited slip center differential .  This is similar to Quattro as it offers a 50/50 torque distribution in normal condions.  The viscous limited slip device adds progressive lock based on differences in axle speeds, where the Torsen adds progressive lock based on differences in axle torque (at the tire/road interface).  The viscous coupling takes longer to respond to conditions than a Torsen would.  (Have to have wheel spin to change bias ratio, where as Torsen ends up being more proactive)  I also noticed the oversteer in my 93 Legacy AWD, its probably due to the delay in the viscous LSD center.

Auto Subies use a electronic controlled hydraulic dual-plate clutch coupling style AWD system which allows the rear axle to be progressively coupled to the front axle based on what the computer wants.  I think they advertise the "normal condition" torque split to be 90/10.  No experience with these.

Cheers,
Keith "AWD Nerd" Maddock
93 S4 mit Torsen Center LSD
ex 91 200q20v mit Torsen Center LSD
ex 92 Talon with  Viscous Center Coupling
ex 93 Legacy mit Viscous Center LSD
Professional experience with Haldex LSC, Open Center, NVG ATC LSC, and Viscous Center Coupling



****************************************************************
Keith Maddock, TRW Automotive,  Koblenz, Germany
Slip Control Systems, Systems Design, Traction Control
+49 (0)261/ 895 2474     -    -    keith.maddock at trw.com


>>> "Matt Russell" <skippertgore at hotmail.com> 18:51:32 12.01.2003 >>>
My biggest complaint is the seats.  Fix the seats, give me some more leg
room and I might consider a WRX as an option.

Quick question: the AWD systems in Subies and Audi's are completely
different, right?  reason for asking is I drove a sube for 3 years
periodically in the snow, and the ass end always seemed to step out more
often than my s4's does in similar conditions.

-Matt, co
92 s4

**************
The styling will never compare with my A4, but you can't have everything. I
am especially disappointed with the rice boy wing on the new Sti.

Richard

**************






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