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Author Topic: Diff questions  (Read 7766 times)

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Latchie_3.0v6

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Diff questions
« on: 29 February 2012, 13:13:13 »
Going to look at a LSD out of a 98 mv6 on Saturday.
Will this fit my car 99 elite
How can I tell if it is a LSD not just welded.
What would be best diff oil to use
Think that's bout it, but if anyone has any other thing I should look for just let me know

Cheers
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cem_devecioglu

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Re: Diff questions
« Reply #1 on: 29 February 2012, 13:17:53 »
 best oil question : factory spec, ep80 grade oil but too thick especially in winter .. so 75W90 is recommended..

got the question wrong  its for gearbox, for differential EP 90 or ep140 depending on climate..

 
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Kevin Wood

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Re: Diff questions
« Reply #2 on: 29 February 2012, 13:18:14 »
If it's an LSD you will see two planetary gear shafts at 90 degrees, if you look into the hole where the driveshafts locate. Open diffs have just a single shaft.

If it's welded, you won't be able to turn the driveshafts individually. If it's an open diff, this will be possible. If it's an LSD, it might be stiff to turn one wheel independently of the other, but should be possible.

BOA90LS is a common recommendation for the oil.
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Kevin Wood

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Re: Diff questions
« Reply #3 on: 29 February 2012, 13:22:18 »
Quote from: cem on 29 February 2012, 13:17:53
best oil question :  factory spec, ep80 grade oil but too thick especially in winter .. so 75W90 is recommended..

My understanding is that EP oils are not necessarily compatible with plate LSDs. You need an oil with an "LS" suffix which will have the correct friction modifiers and won't contaminate the clutch plates.
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cem_devecioglu

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Re: Diff questions
« Reply #4 on: 29 February 2012, 13:27:36 »
Quote from: Kevin Wood on 29 February 2012, 13:22:18
Quote from: cem on 29 February 2012, 13:17:53
best oil question :  factory spec, ep80 grade oil but too thick especially in winter .. so 75W90 is recommended..

My understanding is that EP oils are not necessarily compatible with plate LSDs. You need an oil with an "LS" suffix which will have the correct friction modifiers and won't contaminate the clutch plates.

dont know about contamination but  a quick search brings too many ep 90  or ep140 type oils for lsd

http://ebookbrowse.com/ep-90-gl5-limited-slip-msds-2-pdf-d107846895
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Marks DTM Calib

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Re: Diff questions
« Reply #5 on: 29 February 2012, 13:49:46 »
Omega LSD requires an EP90 with friction modifiers.

Original fit would have been EP90 with seperate additives (and this is what a dealer will supply) but LSD oils are available which have the friction modifiers already in and hence the recommendation of BOA90LS
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zirk

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Re: Diff questions
« Reply #6 on: 29 February 2012, 13:56:42 »
Also worth checking what Diff Ratio your going to end up with, if its ex plod could be different, not to mention swapping between Manual  / Auto etc.

 ;)
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cem_devecioglu

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Re: Diff questions
« Reply #7 on: 29 February 2012, 14:00:19 »
I have checked the ep type lsd oils..

seems like they use a special type of EP modifiers and their sulphur content is non-active as fas as I understand..

"EP mineral gear oils are used more extensively in worm gears. Under conditions of high pressure and temperature, the EP (antiscuff) additive reacts with the metal surface to form a soft, slippery chemical layer which prevents severe wear and welding. Previously, there was a concern that sulfur-phosphorous EP additives would react with the bronze gear. However, new EP additive technology used by most of the major lubricant suppliers has reduced the corrosive attack by utilizing nonactive sulfur. EP lubricants work particularly well when shock loading occurs. EP gear oils also protect steel gears better than compounded gear oils. "

http://www.machinerylubrication.com/Read/169/worm-gear-lubrication

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2woody

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Re: Diff questions
« Reply #8 on: 29 February 2012, 15:54:49 »
it is the "hypoid" additive in most axle oils which poisons LSD plates.
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Latchie_3.0v6

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Re: Diff questions
« Reply #9 on: 29 February 2012, 16:40:19 »
Thanks for all the quick answers. Just another Q how much oil does diff take or is there a marker on side or anything.
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tigers_gonads

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Re: Diff questions
« Reply #10 on: 29 February 2012, 18:38:45 »
I got just over 1 ltr in my standard dif plus a tube of additive
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Latchie_3.0v6

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Re: Diff questions
« Reply #11 on: 04 March 2012, 16:23:45 »
Just fitted the LSD that I bought and it doesn't seem to lock, would there be any reason for this, I was thinking maybe low on oil
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bootie

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Re: Diff questions
« Reply #12 on: 04 March 2012, 16:28:48 »
When you say it doesn't seem to lock, what have you tried doing?

Best test is on gravel, plenty of revs then pop the clutch, should get a nice long 11, i.e. both rears spinning and leaving tracks.
Seeing where you live it might be easier to find some wet grass! LOL
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Latchie_3.0v6

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Re: Diff questions
« Reply #13 on: 04 March 2012, 16:34:29 »
I tried doing a few donuts in a private place :P. Wheels only spun one wheel but I was told that unless diff in tightened it can take quite a bit to get diff to lock.
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bootie

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Re: Diff questions
« Reply #14 on: 04 March 2012, 16:43:08 »
I would do a straight line test rather than donuts, see if that gets the desired results.
As for 'tightening up' I'm afraid I have no knowledge of this, sorry.
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