[db2022cs]

So, for a while now I have been having issues with my 1LE eLSD. It's been to a mechanic, looked good to them mechanically. Dealership looked at the car and after a discussion they also said the car was performing as normal. I am looking to see if those of you with the 1LE can tell me what your eLSD is displaying under a few different conditions. Just normal startup and idle % readout. What it display's when just cruising. During any turns, if it displays any different numbers. Any aggressive driving, how does it react?

My eLSD will display 0% at idle, but after driving the car a bit, it will float between 0-2%. When cruising, the car will also float around 0-2%. The issue I noticed is every time I start up the car the eLSD will constantly spike up to 100% fully coupling the eLSD. This will happen on turns and driving at in town speeds of up to 35mph. As far as I am aware, these events which I believe are the built in eLSD purge procedure for evacuating any air in the system. These events are only only to happen every few key on cycles, not every single time I start the car as I have been having happen. It's also not supposed to do it when turning, it's supposed to only allow these events at low speeds and when the car is straight.

During these events, the car will shift in the rear and unsettle when turning. Unfortunately, I can't figure out what the issue is or how I can get the dealership to understand the issue I am having. I am hyper aware of how the car handles and there has been a very noticeable change from this. I am afraid that something is wrong with the eLSD either mechanically, electrically or through software.

I have had the car aligned, I have done scheduled maintenance for fluid changes all on time. I have done the 1500 mile fluid change for the diff, and I have done it at 45k. Fluid always looked pretty good, no glitter.

According to the documentation from the dealership they sent me during the diagnosis, it says if the system has had a line opened at any point that a service bleed procedure needs to be performed to remove air from the system. They did not do this and told me the car is behaving as it should. It frustrated me as I know the car is not behaving correctly, even according to the exact documentation they sent me. It's just really sad that the car has been so confident to drive for 2 years I owned it, and now I am cautious when I drive it how I want to. I am supposed to take it to two track events this year and Tail of the Dragon a couple times.

[WhiteMale]

You sure it's got the correct diff fluid in there, with the friction modifier for LSDs?

[db2022cs]

Originally Posted by WhiteMale

You sure it's got the correct diff fluid in there, with the friction modifier for LSDs?

Yes, AC Delco 10-4034.

[Msquared]

To be clear, there is the regular diff fluid that you've already replaced before, and there is also hydraulic fluid that controls the clutch engagement. That's in a very separate system, and that is what the bleeding procedure is for. But there should be no need unless someone worked on that system and introduced air into it. Did anyone do that to your car?

[db2022cs]

Originally Posted by Msquared

To be clear, there is the regular diff fluid that you've already replaced before, and there is also hydraulic fluid that controls the clutch engagement. That's in a very separate system, and that is what the bleeding procedure is for. But there should be no need unless someone worked on that system and introduced air into it. Did anyone do that to your car?

Ah ok, I wasn't sure if those were different systems. So, am I correct in that there are automatic events the purges the system of any air that is supposed to happen every few key on events? Are there also sensors that may detect air in the system which would trigger the car to go through the procedure to vent? I'll try to get a video of what my car is doing to help. As far as I know, no one has messed with any hydraulic lines under the car. The car has had oil changed at dealership or by me. I should also mention that after about 15 or so minutes, these events do not come back until the car is restarted again.

[Msquared]

Originally Posted by db2022cs

So, am I correct in that there are automatic events the purges the system of any air that is supposed to happen every few key on events? Are there also sensors that may detect air in the system which would trigger the car to go through the procedure to vent?

Unfortunately, I don't know the answer to those questions.

[SpeZ]

Bleed events - Because the eLSD system is filled
with fluid, small amounts of air will accumulate in
the system over time. A small actuator is built into
the system in order to bleed these small amounts
of air from the system. Every few key cycles, the
driver may notice that the coupling percentage on
the DIC spikes up to 100% briefly. This will occur
at very low speeds and also while driving in a
straight line. This is completely normal and in no
way does this indicate a problem with the system.

https://static.nhtsa.gov/odi/tsbs/20...45400-0001.pdf

[db2022cs]

Originally Posted by SpeZ

Bleed events - Because the eLSD system is filled
with fluid, small amounts of air will accumulate in
the system over time. A small actuator is built into
the system in order to bleed these small amounts
of air from the system. Every few key cycles, the
driver may notice that the coupling percentage on
the DIC spikes up to 100% briefly. This will occur
at very low speeds and also while driving in a
straight line. This is completely normal and in no
way does this indicate a problem with the system.

https://static.nhtsa.gov/odi/tsbs/20...45400-0001.pdf

This is the exact document the dealership has sent me. Also the thing that points out the issue I am having. This says the actuator will bleed the system every few key cycles. It happens EVERY single time I start the car. It also says that it will occur at very low speeds and driving in a straight line. I have seen and felt these events happen up to 40 MPH and while in a turn. This gives it a very unsettling feel to the car. The issue is just trying to get the dealership to acknowledge this is not normal.

[SpeZ]

Hmm weird.
But I can tell you its probably normal to see eLSD lockup at the start.
When I give the engine rpm in park I also see like 20-30% lockup.

[db2022cs]

Originally Posted by SpeZ

Hmm weird.
But I can tell you its probably normal to see eLSD lockup at the start.
When I give the engine rpm in park I also see like 20-30% lockup.

It is normal, under the conditions written in that excerpt you have. What isn't though, is the conditions that it happens. It's designed to do that procedure under very low speeds and no turning as to not interrupt driving. My car is behaving as if it doesn't know it's turning or what speed it's at or that it has already done this procedure recently when it's only supposed to do it every few key cycles. The thing I worry about, is when I take it to VIR in July, is the car going to decide to do a purge event when I am halfway through turn 12 and it locks up the diff.