Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Technical BBS > 1- Porsche Technical Forums > 911 / 930 Turbo & Super Charging Forum

Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: Sep 2013
Location: Oshawa, Ontario, Canada
Posts: 1,388
Garage
Clutch slippage?

Hey fellas, I installed a new Kevlar clutch last winter, it works great but I've had a few times on the track where I've been accelerating and felt it slipping a couple times. Then it would stop doing it. Could it be me accidentally touching the clutch pedal that could cause this? It happened again today on track. Today was a little wet but in process of drying up. In 4th gear it felt like it either clutch was slipping or tires were slipping. The car wasn't squirming around like the tires were spinning.

Could LSD being doing funny things? I'm running 315 rear tires, so lots of grip.
__________________
Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & outlaw pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 06-04-2017, 04:11 PM
  Pelican Parts Technical Article Directory    Reply With Quote #1 (permalink)
Chain fence eating turbo
 
Join Date: Dec 2008
Location: Austin, TX
Posts: 7,889
I was in the exact same boat as you with Kevlar. Mine was due to a leaking RMS. Sometimes it held fine.
Old 06-04-2017, 04:51 PM
  Pelican Parts Technical Article Directory    Reply With Quote #2 (permalink)
Registered User
 
Join Date: Sep 2013
Location: Oshawa, Ontario, Canada
Posts: 1,388
Garage
Ok but I replaced my RMS at the same time I did the clutch.
__________________
Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & outlaw pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 06-04-2017, 07:23 PM
  Pelican Parts Technical Article Directory    Reply With Quote #3 (permalink)
Knee Pads are Overrated!
 
Rawknees'Turbo's Avatar
 
Join Date: Apr 2016
Location: Norf TexASS
Posts: 6,856
PullinMyPuddy, this is probably a silly question, as I think you are beyond this level of troubleshooting, but are you sure you have enough free-play (different that the pay-play you are accustomed to ) in the cable/release arm assembly?
Old 06-04-2017, 07:28 PM
  Pelican Parts Technical Article Directory    Reply With Quote #4 (permalink)
Registered User
 
Join Date: Sep 2013
Location: Oshawa, Ontario, Canada
Posts: 1,388
Garage
Hey Rawknees, is this free play you describe where i measure 1.2mm between the adjuster nut on the arm on bottom of Tranny? If so I thought I had that all good. But I'll check again.

I was wondering if I was accidentally touching the clutch pedal, just barely, if there could be enough pressure to loosen the grip to allow slippage?
__________________
Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & outlaw pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 06-05-2017, 02:59 AM
  Pelican Parts Technical Article Directory    Reply With Quote #5 (permalink)
Knee Pads are Overrated!
 
Rawknees'Turbo's Avatar
 
Join Date: Apr 2016
Location: Norf TexASS
Posts: 6,856
PuddPuller, yep, that is the free-play I was talking about. If it is set correctly, I seriously doubt that an inadvertent, light touch with your meat hook (foot) would cause the clutch to engage slightly and slip. You could always experiment by increasing the free-play a little bit and see how the clutch reacts . . .
Old 06-05-2017, 08:13 PM
  Pelican Parts Technical Article Directory    Reply With Quote #6 (permalink)
Registered User
 
icemann427's Avatar
 
Join Date: Jan 2008
Posts: 854
Quote:
Originally Posted by rawknees'turbo View Post
pullinmypuddy...
omg roflmao!!!!

Last edited by icemann427; 06-05-2017 at 08:56 PM..
Old 06-05-2017, 08:27 PM
  Pelican Parts Technical Article Directory    Reply With Quote #7 (permalink)
Knee Pads are Overrated!
 
Rawknees'Turbo's Avatar
 
Join Date: Apr 2016
Location: Norf TexASS
Posts: 6,856
Quote:
Originally Posted by icemann427 View Post
omg roflmao!!!!
Puddy has the best screen name ever (except for mine, buttofcourse, which HE actually created - no lie).
Old 06-05-2017, 09:13 PM
  Pelican Parts Technical Article Directory    Reply With Quote #8 (permalink)
Registered User
 
Join Date: Sep 2013
Location: Oshawa, Ontario, Canada
Posts: 1,388
Garage
Quote:
Originally Posted by Rawknees'Turbo View Post
Puddy has the best screen name ever (except for mine, buttofcourse, which HE actually created - no lie).
Thanks RawKnees, i'll take yer advice and check the free play in the clutch cable, after i'm finished PullinMyPuddy Buttofcourse!
__________________
Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & outlaw pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 06-06-2017, 04:19 AM
  Pelican Parts Technical Article Directory    Reply With Quote #9 (permalink)
Registered User
 
Join Date: Sep 2013
Location: Oshawa, Ontario, Canada
Posts: 1,388
Garage
I had someone suggest perhaps this slipping or loss of power sensation maybe be my ignition coils going bad. I know my coils are about 20 years old Electromotive Tec1 dual plug set up. I wonder if that could be it? My plugs & wires are all less than 2 years old.
__________________
Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & outlaw pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 06-08-2017, 04:30 AM
  Pelican Parts Technical Article Directory    Reply With Quote #10 (permalink)
Registered User
 
MikeD930's Avatar
 
Join Date: Apr 2008
Location: missouri
Posts: 1,502
Garage
You should be able to tell the difference between slipping clutch (engine revs up with no forward thrust in relation to engine rpm and no tire spin), tire spin (it's pretty obvious when this happens) and engine not running right (engine won't rev up normally while under load).
__________________
MikeD
'87 930
Old 06-08-2017, 03:11 PM
  Pelican Parts Technical Article Directory    Reply With Quote #11 (permalink)
Registered User
 
Join Date: Sep 2013
Location: Oshawa, Ontario, Canada
Posts: 1,388
Garage
MikeD930 you're right, clutch slippage would see a spike in rpms, the car isn't doing that, it acting like when i've had a boost leak in past. The car just stops accelerating. Perhaps its fuel issue? If so i'm not sure how to test that?
__________________
Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & outlaw pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 06-09-2017, 04:17 AM
  Pelican Parts Technical Article Directory    Reply With Quote #12 (permalink)
 
Now Available for Ordering:   101 Projects For Your BMW 3 Series 1982-2000  [more info]
Registered User
 
Alan L's Avatar
 
Join Date: Apr 2006
Location: New Zealand
Posts: 2,809
When you think the clutch is slipping, it should be very obvious on the tacho, even by a few hundred. But tyre spin will give you same. But at least you would eliminate an engine issue. If the tach stays steady, you better look elsewhere. Better eliminate the tach one first. easiest. You shouldn't be getting tyre spin with 315s tho. So if tach spikes, look to the clutch. The clearance can decrease a bit when everything gets hot, so make sure you still got free play after a hot run. But 1.5mm should be enough, and you would have to more than resting your foot on pedal to cause that.
Alan
__________________
83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)

Last edited by Alan L; 06-18-2017 at 10:04 PM..
Old 06-18-2017, 10:02 PM
  Pelican Parts Technical Article Directory    Reply With Quote #13 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 12:41 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2016 Pelican Parts - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.