[Ss7617]

I have a 18 zle. When on track and after the first session the diff starts shuttering or chattering on left turns only. 6m car. Car has 8k miles and 4 diff oil changes w factory oil. I just changed it and went to track with same issue. Any thoughts?
Thanks scott

[dmcmahan60]

What color was the fluid every time you changed it?

[Ss7617]

Last 2 it looked fine. I’m gonna change again this week and see how it looks

[GreenZLE]

The eLSD clutch packs dont circulate gear lube, they have a sealed unit that circulates transmission fluid.

[Ss7617]

Originally Posted by GreenZLE

The eLSD clutch packs dont circulate gear lube, they have a sealed unit that circulates transmission fluid.

I thought the cutch packs were in the gear oil. And the atf fluid just pushed the sealed pistons on gear pack?

[GreenZLE]

Originally Posted by Ss7617

I thought the cutch packs were in the gear oil. And the atf fluid just pushed the sealed pistons on gear pack?

I thought the same thing and always changed my gear lube with the GM lube with friction modifier. There has been several threads about this on Camaro 6. The last one I looked at had a picture of the sealed unit with splines that engage the axle.


Hopefully someone can chime in to confirm or deny.

[Msquared]

Originally Posted by Ss7617

I thought the cutch packs were in the gear oil. And the atf fluid just pushed the sealed pistons on gear pack?

This is correct: the clutch packs sit in gear lube like any other passive clutch LSD, and it's the same fluid that also bathes the gears. The hydraulics that actuate the force on the clutch packs are completely sealed and separate from the rest of the diff. You have to make sure you are using the proper GM 88862624 diff fluid. It already has friction modifier in it and does not need anything added.

I can't come up with an explanation for why your car only chatters on left turns when the diff gets hot. In that scenario, the left side is turning slower than the right, but that doesn't really explain anything. Are you 100% it's the diff chattering and not a wheel bearing or CV joint?

[Ss7617]

Originally Posted by Msquared

This is correct: the clutch packs sit in gear lube like any other passive clutch LSD, and it's the same fluid that also bathes the gears. The hydraulics that actuate the force on the clutch packs are completely sealed and separate from the rest of the diff. You have to make sure you are using the proper GM 88862624 diff fluid. It already has friction modifier in it and does not need anything added.

I can't come up with an explanation for why your car only chatters on left turns when the diff gets hot. In that scenario, the left side is turning slower than the right, but that doesn't really explain anything. Are you 100% it's the diff chattering and not a wheel bearing or CV joint?

I’m using the factory Druid with the modifier in it. I guess I can’t say 100% it’s the diff,but I’m pretty sure it is. It feels like it binds and unbinds only after it’s really warm. First session of track day it’s fine. Can’t replicate on street.

[dpevans]

My question is reading these forums is I believe there is a software update for the eLDS.

[DaveC113]

Originally Posted by Ss7617

I’m using the factory Druid with the modifier in it. I guess I can’t say 100% it’s the diff,but I’m pretty sure it is. It feels like it binds and unbinds only after it’s really warm. First session of track day it’s fine. Can’t replicate on street.

Since you're using factory fluid and assuming it's not low, it sounds like something happened to the clutches in the diff but you never know without a thorough investigation. Maybe an axle, but I can't think of much else that would make the car behave that way.

For better or worse, there's lots of ZLE parts for sale used if you need something.

[Msquared]

Originally Posted by dpevans

My question is reading these forums is I believe there is a software update for the eLDS.

It's a firmware update for the module that controls the diff. However, it has nothing to do with fixing chatter, and it only affects the timing and rate of locking when all nannies are turned off and your below about 80mph. Therefore, it's not like to change much about the diff's track behavior. It was intended to improve its function for autocross use, and it succeeded at that.

[NickyRacerBoy]

Originally Posted by Ss7617

I have a 18 zle. When on track and after the first session the diff starts shuttering or chattering on left turns only. 6m car. Car has 8k miles and 4 diff oil changes w factory oil. I just changed it and went to track with same issue. Any thoughts?
Thanks scott

Hey Scott I have a spare ESLD with module for sale.

[AZIROC]

I had the same issue....ended up putting some SPL toe links on and that helped alot.

[Patriot Motorsports USA]

Originally Posted by Ss7617

I have a 18 zle. When on track and after the first session the diff starts shuttering or chattering on left turns only. 6m car. Car has 8k miles and 4 diff oil changes w factory oil. I just changed it and went to track with same issue. Any thoughts?
Thanks scott

For one... I only use Amsoil on my ZLE A10 and I change the fluid pretty much before each two-day track weekend (it helps having a lift, shop and a pump mounted to a 5-gallon pail full of the stuff...). In all of my abusive 13k track & mountain road driving with 20K total miles... I have never had the rear end chatter.

The ATF going through the eLSD is coming from the transmission, being pumped from your M6, to the engine's cooling radiator, then down to and across the lower Aux Heat Exchanger (LAHX) before it makes the long really hot trip past the header/cats/tunnel to the eLSD to do more work, BEFORE going back to the transmission.

SO... if your using the Mobil1 or GM fluid for this and that fluid is OLD, it already starts out weaker than quality hydraulic fluid and could be causing the issues you are experiencing. My suggestion is switching to the Amsoil Signature Series fluid. Changing fluid alone will improve shifting as well as lower it's operating temps with greater hydraulic compressibility for the eLSD. I think this will solve your issues.