Slip Loc Additive...

[galaxy]

Interesting tidbit...I know it's been discussed about not needing, not adding the slip loc additive to gear oil with Torsen - I was just going through the owners manual on my '12 with Torsen. The spec table says add the slip loc additive and makes no reference at all to omitting for Torsen or anything else. Yes, I'm aware top shelf fluids claim it's not needed with their product. I'm curious where the conversation about not using with Torsen started? Was that later years?

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[Wraithracing]

The additive causes slippage in normal clutch type differentials. Non clutch differentials such as Torsen/True Trac, etc. don't require the additive. In fact Eaton Detroit True Trac specifies non synthetic gear oil only with no traction lock/anti slip additive. Torsen recommend synthetic gear oil with no additives/friction modifiers. Personally, I would leave it out, but opinions may vary.

In old style clutch positractions/traction lock differentials the additive/friction modifiers allows silppage so you don't get clutch chatter with the differential, but can actually lead to the cutches wearing out earlier due to said slippage.

 

[Optimum Performance]

For track use we do not run it, for street use you want to. For the same reasons it is used in the Clutch type differentials. Most modern lubes have a version that already has Limited Slip additive in it. Running the additive in the Torsen calms it down. The Torsen can unlock in a harsh manner during low speed turns. If Ford did not put it in everyone would complain about the car.

 

[WD Pro]

For track use we do not run it, for street use you want to. For the same reasons it is used in the Clutch type differentials. Most modern lubes have a version that already has Limited Slip additive in it. Running the additive in the Torsen calms it down. The Torsen can unlock in a harsh manner during low speed turns. If Ford did not put it in everyone would complain about the car.

If we ignore noise related issues, does it improve the performance of the diff in anyway by leaving it out ?

i.e. is it left out on your track cars for a benefit, or just to save some $'s as the potential noise is a non issue ?

Cheers

 

[Optimum Performance]

If we ignore noise related issues, does it improve the performance of the diff in anyway by leaving it out ?

i.e. is it left out on your track cars for a benefit, or just to save some $'s as the potential noise is a non issue ?

Cheers

Per Torsen, it should make it work better in a road course environment because Torsens work off of friction. Because you are never loading the tires "equally" through a turn it will help feed power to both wheels more evenly before it starts splitting torque. The issue with Torsen's is if a wheel looses contact with the ground you can loose forward drive out of the corner, if only momentarily. The Torsen works on a torque bias principle, it needs some opposing force to work, so wheel in the air, no opposing force, so nothing to drive the wheel to wheel with traction, and it acts like an open differential. The limited slip additive can make things too slippery so all of the available torque biasing is not transferred to the wheel with traction. Something a driver may or may not feel, possibly show up in a sector time.

Probably poorly worded, but street car, run additive. Track car no need to. Additive calms down the action to reduce NVH complaints. I can tell you, my 2015, new, did not have additive in it as delivered. It was like driving an old Detroit locker, it popped on low speed turns. When it was cold it would literally try to turn the inside wheel backwards pulling out of a side street and the P-Zero's in cold weather would just slip. First post track day fluid change all of that went away. I knew what it was so I didn't worry about it, it brought me back to high school when I had a spool in my Fairmont, you had to plan ahead to turn into parking spaces

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