Diff fluid

[T Verdier]

Anybody running this stuff?

http://www.redlineoil.com/product.aspx?pid=42&pcid=8

I've heard that it's great for making your diff not slip I was just wondering if anybody has used it.

[geezerman402]

Never used it, and never had a problem with the diff slipping. Just used redline diff oil with the additive for LSD.

[T Verdier]

I don't know slipping is the right word but my inside wheels will just roast.

[SkinnyVT]

I don't know slipping is the right word but my inside wheels will just roast.

slipping is the right word but it sounds like you need to rebuild your diff with new clutches.

[DragonOrta]

I don't think the superlight is what you would want in a diff. I've put Heavyweight Shockproof in my diffs and it seems to be working fine.

[nando]

I've used shockproof in my transfercase but I don't know about putting it in a rear diff. the regular redline differential products seem to work fine. if you have cooling issues you could always get the m-coupe cover.

BTW shockproof is even more disgusting smelling than regular diff oil.. lol

[2002maniac]

your diff is toast.

"LSD additive" is to make the clutches slip more so they don't chatter.

[T Verdier]

So LSD additive is bad if your pushing your car but good if you can't handle a little bit of diff chatter? I'm all for sacraficing comfort for performance. I need more friction not less.

[5KWattson]

if your inside tire is "roasting" your LSD is done already no saving that thing...either make a junk yard run and find a low miles one or rebuild it...i have seen the same thing on my friends 240sx when he pulled his lsd apart it was silky smooth on what use to be the clutch material

[e30trooper]

my diff is a lil chattery since i changed mine with some tegra 75/90 syn gear oil. Im pretty sure theres a small amount of lsd additive in it Its loud if im going very bery slow and turning with 5% gas . allmost like its tring to lock up

[jlevie]

The choice of fluid will make a slight difference in how a clutch type (what an E30 has) limited slip differential behaves. But nothing will compensate for worn out clutches. A simple test of clutch wear is to jack up the driver's rear wheel and use a torque wrench on the axle nut to see how much torque is required to turn the wheel. A new or recently rebuilt diff will require 55-65ft-lbs to turn the wheel. One with light wear might come in at 45-50ft-lbs. I replace the clutches in the diff if the torque is below 40ft-lbs.

[JGood]

The choice of fluid will make a slight difference in how a clutch type (what an E30 has) limited slip differential behaves. But nothing will compensate for worn out clutches. A simple test of clutch wear is to jack up the driver's rear wheel and use a torque wrench on the axle nut to see how much torque is required to turn the wheel. A new or recently rebuilt diff will require 55-65ft-lbs to turn the wheel. One with light wear might come in at 45-50ft-lbs. I replace the clutches in the diff if the torque is below 40ft-lbs.

Agreed. My track car requires 52-53 ft lbs and has good performance. My daily driver requires about 35 ft lbs, and that thing is shot, it feels like an open diff.

[blitz355]

I don't use that specific stuff, but i do use redline, good stuff. Bavauto sells it.

[Hallen]

The choice of fluid will make a slight difference in how a clutch type (what an E30 has) limited slip differential behaves. But nothing will compensate for worn out clutches. A simple test of clutch wear is to jack up the driver's rear wheel and use a torque wrench on the axle nut to see how much torque is required to turn the wheel. A new or recently rebuilt diff will require 55-65ft-lbs to turn the wheel. One with light wear might come in at 45-50ft-lbs. I replace the clutches in the diff if the torque is below 40ft-lbs.

I've always wondered about the specs of the diff. I've seen things like 25% locking. I've also seen things on other diffs that show a power/coast percentage like 75% Power and 30% coast. I've also heard about a preload value. What are the numbers for the stock E30 diff? Does anybody know?

[hoveringuy]

I checked mine today and it was 45 ft-lbs. I guess that's good...