Recent Topics
Generator Questions / Comments
by Vikas
07/29/14 07:23 AM
Why do some brands only publish tq and not hp?
by LoneRanger
07/29/14 06:49 AM
Replaced Opti-Coat with CQuartz UK - Holy Gloss!
by The Critic
07/29/14 02:59 AM
At 65
by OneEyeJack
07/29/14 01:25 AM
roofing felt
by bmwjohn
07/29/14 12:09 AM
Pennzoil Ultra 10w30 1,704 on PU 1997 Camry 194k
by Nick1994
07/29/14 12:04 AM
MaxLife 5w30, 5k oil on 07 Sienna with 95k
by raitchison
07/28/14 10:50 PM
big car crash
by morris
07/28/14 10:12 PM
U.S. says Russia violated nuclear missile treaty.
by dave1251
07/28/14 09:58 PM
Rotella in a civic MT
by gametom
07/28/14 09:51 PM
14' JGC with the pentastar 3.6L
by subaroo
07/28/14 09:41 PM
Your wax/sealant lasted how many months?!?!
by The Critic
07/28/14 09:16 PM
Newest Members
dink28m7, Titus12, JayBirdy, Michael_Trinh, kensley
50789 Registered Users
Who's Online
82 registered (2009Edge, 97f150, 2010_FX4, 05LGTLtd, 05lgt, 94astro, 9 invisible), 1424 Guests and 219 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
50789 Members
64 Forums
216977 Topics
3415951 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG

Page 2 of 2 < 1 2
Topic Options
#3209703 - 12/07/13 05:30 PM Re: GL5 with friction modifiers [Re: MolaKule]
dailydriver Offline


Registered: 03/14/06
Posts: 6834
Loc: Bucks County, Pa.
Originally Posted By: MolaKule
Originally Posted By: redbone3
I found this on the Torsen website:

Torsen for GM vehicles:

Is it true that the Torsen unit in the production Camaro needs the GM modifier added? Top of the Page

GM issued a technical bulletin adding modifier to the rear axle oil. This was done to quiet what we call a "Rusty Screw" noise that we heard in a very small percentage of vehicles. This does not happen in all cases, however to address owner's concerns we asked that the modifier be used in all instances to insure that the driver would not get this noise. When replacing the fluid it is at the owner's discretion whether or not to add the modifier. Elimination of the modifier does not affect durability of the differential.


Does the GM tech bulletin mention a part number such as GM #88900330 or some other "modifier?"

The description for this product says:

Quote:
The additive reduces friction between your limited slip or positraction differential friction plates to eliminate the annoying chatter that is common with these types of units. This Chevrolet Performance limited slip lubricant additive not only quiets your rear-end, but it can also aid in your differential's ability to apply and release the clutch smoothly, creating a more pleasant and predictable power delivery.


There are no clutches in the Torsen.


My guess is that it slightly reduced the case to outer worm gear friction, just enough to eliminate the noises.

I remember this TSB, even though it did NOT affect me since I had already changed out the T-2 for an Eaton carbon clutch pack Posi (about a year after I bought the car), which DOES need some FM to not 'rusty screw', or chatter around slow, parking lot speed turns, or no torque applied, coasting turns. wink
_________________________
2000 Z28 1SC 6 speed 170K miles
Red Line 0W-40/Sustina 0W-20 (80/20 mix)
Amsoil EaO 64 filter
Millers CRX 75-140 NT/4oz. XL-3
Ravenol MTF-2

Top
#3210854 - 12/08/13 09:43 PM Re: GL5 with friction modifiers [Re: dailydriver]
MolaKule Offline


Registered: 06/05/02
Posts: 14105
Loc: Midwest
Originally Posted By: dailydriver
Originally Posted By: MolaKule
Originally Posted By: redbone3
I found this on the Torsen website:

Torsen for GM vehicles:

Is it true that the Torsen unit in the production Camaro needs the GM modifier added? Top of the Page

GM issued a technical bulletin adding modifier to the rear axle oil. This was done to quiet what we call a "Rusty Screw" noise that we heard in a very small percentage of vehicles. This does not happen in all cases, however to address owner's concerns we asked that the modifier be used in all instances to insure that the driver would not get this noise. When replacing the fluid it is at the owner's discretion whether or not to add the modifier. Elimination of the modifier does not affect durability of the differential.


Does the GM tech bulletin mention a part number such as GM #88900330 or some other "modifier?"

The description for this product says:

Quote:
The additive reduces friction between your limited slip or positraction differential friction plates to eliminate the annoying chatter that is common with these types of units. This Chevrolet Performance limited slip lubricant additive not only quiets your rear-end, but it can also aid in your differential's ability to apply and release the clutch smoothly, creating a more pleasant and predictable power delivery.


There are no clutches in the Torsen.


My guess is that it slightly reduced the case to outer worm gear friction, just enough to eliminate the noises.

I remember this TSB, even though it did NOT affect me since I had already changed out the T-2 for an Eaton carbon clutch pack Posi (about a year after I bought the car), which DOES need some FM to not 'rusty screw', or chatter around slow, parking lot speed turns, or no torque applied, coasting turns. wink


You could be right. Maybe I am trying to over analyze this thing, something I have never done in my life, of course. grin

But if you look at the simulation, torque forces are being transferred purely across the gearing, so the only thing left in my view would be the bearings in the gear carriers. AKA, reactive forces causing wobble in the bearings that could be dampened out by the polymers in FM.
_________________________
I told a chemistry joke....there was no reaction. smile

Top
#3212295 - 12/10/13 12:21 PM Re: GL5 with friction modifiers [Re: Whitewolf]
brandini Offline


Registered: 10/08/09
Posts: 944
Loc: Richmond, VA
Originally Posted By: Whitewolf
It depends on the advised change interval but it is well proven that FMs reduce the life of a gear oil when compared to a non FM version of the same formulation.

Link to data?
_________________________
07 Mazda3s Hatch - ZoomZoom - Using EAO-ALM-BF3-MTG-ANT-ATF

Top
#3212356 - 12/10/13 01:33 PM Re: GL5 with friction modifiers [Re: brandini]
Whitewolf Offline


Registered: 10/05/06
Posts: 1886
Loc: MI, USA
There is no link. I would have to post an example of what I can show but it is not a point of debate it is a very well known fact throughout the lubricant industry.
_________________________
My definition of an expert in any field is a person who knows enough about what's really going on to be scared.
~ PJ Plauger

Top
#3212556 - 12/10/13 04:04 PM Re: GL5 with friction modifiers [Re: Whitewolf]
72te27 Offline


Registered: 07/21/10
Posts: 85
Loc: Kentucky
Originally Posted By: Whitewolf
We have been using Torsen diffs for years...

Who is "we"?
_________________________
'72 Toyota Corolla 1.6
'03 Suburban 5.3
'05 Honda Accord 2.4
'08 Honda Accord 2.4
'11 Honda Accord Coupe 2.4
'11 Mazda 6 2.5

Top
#3214264 - 12/12/13 08:51 AM Re: GL5 with friction modifiers [Re: 72te27]
Whitewolf Offline


Registered: 10/05/06
Posts: 1886
Loc: MI, USA
Quite a number of manufacturers either as a conventional diff or a center diff for 4WD. In fact a Torsen diff equipped F1 car won a GP at the Hungaroring some years ago.


Edited by Whitewolf (12/12/13 08:51 AM)
_________________________
My definition of an expert in any field is a person who knows enough about what's really going on to be scared.
~ PJ Plauger

Top
#3215934 - 12/13/13 08:56 PM Re: GL5 with friction modifiers [Re: 72te27]
bruce381 Offline


Registered: 06/23/05
Posts: 3324
Loc: Millbrae, CA
whitewolf give up go back to the shadows LOL

Top
#3216172 - 12/14/13 04:37 AM Re: GL5 with friction modifiers [Re: redbone3]
INDYMAC Offline


Registered: 07/15/06
Posts: 2324
Loc: Magnolia, TX
Originally Posted By: redbone3
I recently put Peak Limited Slip Synthetic 75-90 GL5 gear oil in my '95 Miata (Thorsen) axle. I understand the Thorsen axle doesn't require the LS oil. My thought was any rear axle is going to have very similar requirements for lubrication (still has a ring and pinion gear for example) so the LS type lube would be fine. Am I missing something?


I think LE1605 DUOLEC would work very well in your Miata Torsen LSD.
_________________________
2013 Toyota Tundra DC 4X4 5.7L FFV
2012 Toyota 4Runner 2WD SR5
2004 Honda S2000

Top
Page 2 of 2 < 1 2