Does my Cayman really have an LSD? - Page 2 - Dorkiphus.net
Navigation » Dorkiphus.net > Technical & Track Disussions > Porsche Technical Discussions » Does my Cayman really have an LSD?

Porsche Technical Discussions Porsche related technical discussions and questions go here.

Reply
 
Thread Tools Display Modes
  #11  
Old 06-30-2022, 08:44 PM
Dandelion's Avatar
Dandelion Dandelion is offline
 
Join Date: Apr 2011
Location: Herndon/Reston, VA
Posts: 1,834
Dandelion
Default

Quote:
Originally Posted by Mark Hubley View Post
Last December I bought a 2015 Cayman GTS. According to the seller, and according to the Certificate of Authenticity that came with the car, it has the Porsche Torque Vectoring option. According to information I see on the Interwebs, PTV includes a limited slip differential. So, I have been assuming my car has an LSD.

Recently, I had the car on my lift to swap wheels. While I had the car up in the air (and transmission set in 1st gear), I rotated one of the rear wheels (forward direction), and I noticed the other spun in the opposite direction (as if in reverse). I was under the impression that if a car has an LSD, both wheels will rotate in the same direction.

Does this mean my car does not have a limited slip diff?
Or maybe with this particular LSD it is normal for the wheels to rotate in opposite directions when testing like this?
What do the wheels do when the car is in neutral and you spin one side while on the lift?

ed
__________________
ed

2016 GT4
2012 Cayman R
2005 Lotus Elise
1994 RX-7 R2
Reply With Quote
  #12  
Old 07-01-2022, 10:25 AM
HoodPin's Avatar
HoodPin HoodPin is offline
 
Join Date: Dec 2004
Location: Monrovia, MD
Posts: 10,617
HoodPin
Default

Quote:
Originally Posted by Dandelion View Post
What do the wheels do when the car is in neutral and you spin one side while on the lift?

ed
I was wondering the same. I've normally checked for LSD wheel rotation with the trans in neutral. On a normal rear axle, driven by a driveshaft, it shouldn't make a difference. But on a transaxle, I wonder if having it gear changes the behavior.
__________________
- Tony P.

Currently
- 1984 944 SP2 racer
- 1977 911 KM Special vintage racer
- 1989 944S2 (stuck in limbo)
- 2012 Cayman R (also the wife's)
- 2000 Boxster S (now mine)

- 1995 993 (garage queen)
- 2007 Cayman S (wife's track beast)
- 2017 F350 (tow monster)

Gone but not forgotten
- 1979 RX7 (found a new home)
- 1986 944 (under new mgmt)
- 1991 944S2 (in car heaven...)
- 2001 Chevy Suburban 2500 (FIL's beast now)
Reply With Quote
  #13  
Old 07-02-2022, 06:57 AM
Mark Hubley's Avatar
Mark Hubley Mark Hubley is offline
 
Join Date: Oct 2010
Location: Dunkirk, MD
Posts: 808
Mark Hubley
Default

Thanks for all the input. I got the following feedback from someone on Rennlist:

"All of the late model Caymans have a zero preload LSD. What this means is that while it has clutches, there are no spring washers, so it has no resistance and when a wheel is spun it acts like it’s open. This will apply to PTV vehicles regardless of whether they are 6spd or PDK."
__________________
2015 Cayman GTS
2021 Jetta R-line
2016 F-250

Formerly owned Porsche/BMW:
1986 944 Turbo
2006 325i
2000 911
1987 924S
1999 Boxster
1986 944
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump