| SBSerpent |
01-10-2021 06:40 PM |
Open or LS Differential...
...on the BMW M3 E36 that comes standard with our cars?
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| spdbrake |
01-10-2021 06:51 PM |
It can be either depending on what was optioned when the Backdraft was spec'd out.
To tell what you have there should be a metal tag attached to your rear diff cover.
having an "S" in front of the ratio is the LSD Id. Pics here.
https://differentials.myshopify.com/...p-differential |
| SBSerpent |
01-31-2021 01:13 PM |
Quote:
Originally Posted by spdbrake
(Post 1487555)
It can be either depending on what was optioned when the Backdraft was spec'd out.
To tell what you have there should be a metal tag attached to your rear diff cover.
having an "S" in front of the ratio is the LSD Id. Pics here.
https://differentials.myshopify.com/...p-differential
|
I can't see any tag.
When both wheels are off the ground and the tranny is in neutral, spinning one wheel does not effect the opposite wheel (i.e. the opposite wheel does not spin). However, spinning either wheel in a forward direction results in the drive shaft rotating in the same direction. Is that an indication of a LSD? |
| bobcowan |
01-31-2021 04:26 PM |
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| SBSerpent |
01-31-2021 06:33 PM |
Quote:
Originally Posted by bobcowan
(Post 1488408)
|
As I noted in my post, the other tire did NOT spin at all.
That being said, I went out and did the true test - a burnout in the street. Only the passenger side left a mark. That's disappointing, especially on a car like this.:mad: |
| Gaz64 |
01-31-2021 07:02 PM |
The easier way is to jack up one side, select neutral.
If the wheel turns easily, you have an open diff.
An LSD takes a lot more effort to turn, the "breakaway torque" can be about 70 ft/lbs.
Gary
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| patrickt |
01-31-2021 07:07 PM |
Quote:
Originally Posted by SBSerpent
(Post 1488410)
As I noted in my post, the other tire did NOT spin at all.
That being said, I went out and did the true test - a burnout in the street. Only the passenger side left a mark. That's disappointing, especially on a car like this.:mad:
|
Just replace it with a LSD. That's actually kind of a fun project.:cool: |
| SBSerpent |
01-31-2021 10:06 PM |
I'm just scratching my head as to why there was no spinning of the other wheel when I turned the opposite wheel.
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| patrickt |
02-01-2021 06:57 AM |
Quote:
Originally Posted by SBSerpent
(Post 1488416)
I'm just scratching my head as to why there was no spinning of the other wheel when I turned the opposite wheel.
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Well, that's a good question. The only time I can ever remember that occurring with a car of mine was when a gear was broken. But just putting it up on a lift and popping the cover off will tell you. Maybe it was just having a bad day.;) |
| joyridin' |
02-01-2021 08:28 AM |
Quote:
Originally Posted by SBSerpent
(Post 1488416)
I'm just scratching my head as to why there was no spinning of the other wheel when I turned the opposite wheel.
|
Are you sure it doesn't have a helical style LSD instead of a clutch type? I am not sure if you bought the car new, but if not, maybe somebody had one installed?
Doing a burnout is not a good way of checking. If the clutch plates or the cones are worn in the LSD, both wheels may not spin anyhow. |
| patrickt |
02-01-2021 09:05 AM |
Quote:
Originally Posted by joyridin'
(Post 1488426)
Are you sure it doesn't have a helical style LSD instead of a clutch type?
|
Dang, I don't even know what a helical style limited slip is, but I did post this thread on checking the breakaway torque on my Powr-Lok, for what that's worth.:cool: http://www.clubcobra.com/forums/era-...-powr-lok.html |
| t walgamuth |
02-01-2021 09:10 AM |
The opposite side caliper might be sticking enough to keep it from turning easily.
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| mln385 |
02-01-2021 05:16 PM |
BDR's come standard with an open diff unless otherwise ordered and paid for.
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| FredG |
02-01-2021 06:48 PM |
Do the modern limited slips have the same annoying ratcheting effect when making a slow sharp radius turn that my 66 vette had?
Fred
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| SBSerpent |
02-01-2021 09:17 PM |
Did some research on a helical style LSD. The proper way to test the wheel rotation is to have both drive wheels off the ground and the transmission in gear. Spinning one wheel will result in the other wheel spinning in the opposite direction.
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| bobcowan |
02-01-2021 09:18 PM |
No. Your old 'Vette had a locking gear. They're famous for that ratcheting action in the corners. A limited Slip is a lot different.
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| SBSerpent |
02-07-2021 06:08 PM |
So this is what I did. Lifted the rear end so that both wheels were off the ground.
1) with the transmission in gear, I spun one wheel in one direction and the other wheel spun in the opposite direction
2) with the tranny out of gear, I spun one wheel and it did not affect the motion of the other wheel
3) with the tranny still out of gear, I spun the driveshaft by hand and both wheels spun in the same (forward) direction simultaneously
Took the car out for a drive today and I did feel both tires let loose a couple of times on hard acceleration.
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