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 Forums > Porsche Forums > Porsche 911 Technical Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
OldTee's Avatar
 
Join Date: Dec 2003
Location: Centreville, MARYLAND
Posts: 939
Question Logic for not adding a little STP to the Transmission

Other than it won't meet Porsche specs what is the logic not to add a little STP to a 79SC transmission? A VW mechanic suggested it.

__________________
Old Tee
all 911s sold
Old 02-01-2004, 08:14 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered User
 
HawgRyder's Avatar
 
Join Date: Feb 2002
Location: Langley, BC Canada
Posts: 2,865
Garage
Send a message via ICQ to HawgRyder
Sometimes the STP will make the gear lube too slippery.
This will make the synchros work harder or not at all (makes the shifting harder).
Bob
__________________
Bob Hutson
Old 02-01-2004, 08:18 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered User
 
Join Date: Oct 2000
Location: Nearby
Posts: 54,072
Garage
Send a message via AIM to fintstone
I wouldn't risk it. As you know, synchros work on friction. Too much, they wear out, not enough, they just don't grab..and no synchronization....That is why one must be careful that they use the correct lubricant.
__________________
74 Targa 3.0, 89 Carrera, 04 Cayenne Turbo
http://www.pelicanparts.com/gallery/fintstone/
"The problem with socialism is that you eventually run out of other people's money"
Some are born free. Some have freedom thrust upon them. Others simply surrender
Old 02-01-2004, 10:34 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered User
 
Join Date: Aug 2002
Location: Galivants Ferry, SC
Posts: 10,551
Same reason some synthetics won't work well...Porsche baulk-ring syncros especially need a bit of friction to work well. The later ( and more common) Borg-Warner cone style don't seem to suffer as much. More contact area ??

---Wil Ferch
__________________
Wil Ferch
85 Carrera ( gone, but not forgotten )
Old 02-02-2004, 05:45 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered User
 
OldTee's Avatar
 
Join Date: Dec 2003
Location: Centreville, MARYLAND
Posts: 939
Thoughtfull responses, thank you. By the way, the VW mechanic is my brother-in-law. Just wait until the next family get together!
__________________
Old Tee
all 911s sold
Old 02-02-2004, 07:36 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
17 years and 17k posts...
 
azasadny's Avatar
 
Join Date: Jul 2002
Location: Wyandotte, MI (Southeast Michigan)
Posts: 17,371
Garage
OldTee,

I've been using Swepco 201 for the past year with great results. Have you tried it? I haven't used any additives and the shifting has improved noticeably...
__________________
Art Zasadny
1974 Porsche 911 Targa "Helga" (Sold, back home in Germany)
Driving Ford company cars now...
www.ford.com
Old 02-02-2004, 08:11 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
Registered User
 
Par911's Avatar
 
Join Date: May 2003
Location: DMV
Posts: 1,431
I agree with Art, I use swepco 201 for my 79SC. Maybe try some of the swepco.
Old 02-02-2004, 08:29 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Senior Member
 
Early_S_Man's Avatar
 
Join Date: Dec 1999
Location: TX USA
Posts: 9,806
Send a message via Yahoo to Early_S_Man
Porsche Crest

Old Tee,

What gear lube are you using in your 915 transaxle, and how recently was it changed. Porsche was recommending that the gear oil be changed at every engine oil change back in the '70s. What complaints do you have about your SC's 915?

If your brother-in-law's suggestion was to use heavier gear oil, or along those lines, I suggest flushing the existing gear oil with Valvoline SAE 85W-140 gear oil. If that improves shifting quality, then change it again within 500 miles with the same, or change to Swepco 212.
__________________
Warren Hall, Jr.

1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
Old 02-02-2004, 10:52 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 10:04 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2020 Pelican Parts, LLC - 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.