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Old 09-03-2019, 05:31 PM   #141
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Originally Posted by Mark R View Post
Diff fluid has been changed 3 times in 7000 miles.
I would be pursuing the lemon law or asking for a new unit then.
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Old 09-04-2019, 06:02 PM   #142
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I would be pursuing the lemon law or asking for a new unit then.
The problem is that it seems to affect most ZL1s. I swear the 2 other 2018s I drove (an A10 and an M6) before I ordered mine did it. Mine did it on day one — or as soon as I started making pulls from freeway speeds. Definitely not a problem with the clutches in the diff or anything. Mine has no problem roasting a set of Mickey Thompson drag radials at the strip.

I’m not 100% sure yet, but I think mine’s been cured. I aligned my car early on (~1500 miles) and it didn’t go away. So I figured it must be some weird software thing with the diff. It would really only do it nailing it from a roll at certain speeds. No problems at the drag strip on my 10.79 pass.

Fast forward 3000 miles, and I decided to align my car again. This time on our brand new Hunter machine we use for Porsche’s. Shit was toe’d out in the rear, and had massive front toe in. We were having calibration problems with our old Hunter machine for several years, so I don’t really know what the deal is. I’m guessing the alignment I did on the old machine was always off. That or it somehow moved on it’s own. But rear toe out can definitely cause stability problems under WOT. I’ve seen that on M3s back in the day.

Don’t want to knock on wood, but I haven’t been able to reproduce it since. My car loses traction really easily, so it’s sometimes a little hard to tell.
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Old 09-05-2019, 06:25 PM   #143
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Originally Posted by BMWM.D. View Post
The problem is that it seems to affect most ZL1s. I swear the 2 other 2018s I drove (an A10 and an M6) before I ordered mine did it. Mine did it on day one — or as soon as I started making pulls from freeway speeds. Definitely not a problem with the clutches in the diff or anything. Mine has no problem roasting a set of Mickey Thompson drag radials at the strip.

I’m not 100% sure yet, but I think mine’s been cured. I aligned my car early on (~1500 miles) and it didn’t go away. So I figured it must be some weird software thing with the diff. It would really only do it nailing it from a roll at certain speeds. No problems at the drag strip on my 10.79 pass.

Fast forward 3000 miles, and I decided to align my car again. This time on our brand new Hunter machine we use for Porsche’s. Shit was toe’d out in the rear, and had massive front toe in. We were having calibration problems with our old Hunter machine for several years, so I don’t really know what the deal is. I’m guessing the alignment I did on the old machine was always off. That or it somehow moved on it’s own. But rear toe out can definitely cause stability problems under WOT. I’ve seen that on M3s back in the day.

Don’t want to knock on wood, but I haven’t been able to reproduce it since. My car loses traction really easily, so it’s sometimes a little hard to tell.
Keep hammering on it to see if the new alignment cured the wiggle and report back to us man!

That wiggle in the rear at highway pulls is a buzz kill for me since it’s really one of the few times I beat on the car. I don’t do road course so it’s twisty back roads and highway pulls for me.

I don’t see myself keeping this car forever like I want to if I can’t figure this wiggle out.
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Old 09-07-2019, 11:02 AM   #144
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Yes..cool...followed all of your advice last year at the track. was able to get a rythym going for the factory line lock as well. I like it...much better than using the brakes.

Anyone know if the 18s came with this updated eLSD? My dealer doesn't know anything.
Well now I’m pissed and frustrated. This calibration is only available to American cars...NOT CANADIAN ZL1s. It can be done to the 2019s but the 17s and 18s are SOL...WTF GM.

The USA cars have different programming and this upgrade is VIN applicable. Even if I took my car south, I couldn’t get it done.

Somebody please explain this! What or why are the USA and CAD cars sooo different?!
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Old 09-07-2019, 11:32 AM   #145
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I'm pissed we actually have to pay for this one.

Seems more like a fix than a mod. This was my biggest issues on the 17 I had.
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Old 09-09-2019, 03:57 AM   #146
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I have been fighting this all year hard acceleration goes to the left then back to the right I have to get out of it feels like rear end is coming around I put all bmr parts in rear suspension helped but didn't cure it worse with my drag radials on need help on this one
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Old 09-09-2019, 10:23 PM   #147
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Same here. The 17" drag radials on the rear make it 10 times worse. With the stock rears, it barely moves and I can pretty much just keep the wheel straight, but with the drag setup (rears only) it's all over the place. I have to actually make steering corrections to keep it in my lane. The weird part is that it doesn't always do it and it's really bad sometimes and then barely wiggles others. It seems to be relative to how smooth and even the surface is. Both my local track here in London and Clay City, the rear was all over the place. Both tracks have older surfaces that is likely not nice and flat. Bowling Green completely resurfaced their strip and the car tracked perfectly straight every time during Camarofest.

If it's being caused by uneven surfaces, unhooking the front sway bar might fix it (at least at the strip). These cars are super stiff and it doesn't take much of a dip to unload one of the rear tires. So at full throttle, it makes sense that it would take way less to cause one tire to have less grip than the other. I just might have to give this a try one day and see if it helps.
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Old 09-10-2019, 07:09 AM   #148
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Originally Posted by 17CamaroZL1 View Post
Same here. The 17" drag radials on the rear make it 10 times worse. With the stock rears, it barely moves and I can pretty much just keep the wheel straight, but with the drag setup (rears only) it's all over the place. I have to actually make steering corrections to keep it in my lane. The weird part is that it doesn't always do it and it's really bad sometimes and then barely wiggles others. It seems to be relative to how smooth and even the surface is. Both my local track here in London and Clay City, the rear was all over the place. Both tracks have older surfaces that is likely not nice and flat. Bowling Green completely resurfaced their strip and the car tracked perfectly straight every time during Camarofest.

If it's being caused by uneven surfaces, unhooking the front sway bar might fix it (at least at the strip). These cars are super stiff and it doesn't take much of a dip to unload one of the rear tires. So at full throttle, it makes sense that it would take way less to cause one tire to have less grip than the other. I just might have to give this a try one day and see if it helps.
I like your reasoning. The stiffness of the car might be contributing to the wiggle on uneven surfaces.

I/we have to start realizing that there might not be a fix for this wiggle. Since this car is mostly designed for aggressive track driving it is not going to handle like your average car under certain circumstances.
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Old 09-10-2019, 09:30 AM   #149
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Originally Posted by Alain View Post
I like your reasoning. The stiffness of the car might be contributing to the wiggle on uneven surfaces.

I/we have to start realizing that there might not be a fix for this wiggle. Since this car is mostly designed for aggressive track driving it is not going to handle like your average car under certain circumstances.
I would inquire with supercharged SS guys running low 10s/9s and see if they’re experiencing the same thing. I would think it can be narrowed down the the elsd then. (Would be surprised the elsd drag cal wouldn’t mitigate) Are convertible guys feeling the same stuff? The suspension are similar I’d be surprised if the difference would be enough even between ZL1 and SS.

I have a SS with magride trapping mid/low 120 depending on weather. So it might not be fast enough or have enough torque to expose that be behavior on 17” et street ss and haven’t felt that. I do have a set of softer side walled Rs ready to go...so we’ll see
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Old 09-10-2019, 09:35 AM   #150
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I would inquire with supercharged SS guys running low 10s/9s and see if they’re experiencing the same thing. I would think it can be narrowed down the the elsd then. (Would be surprised the elsd drag cal wouldn’t mitigate) Are convertible guys feeling the same stuff? The suspension are similar I’d be surprised if the difference would be enough even between ZL1 and SS.

I have a SS with magride trapping 120.5 in the dead heat of summer. So it might not be fast enough or have enough torque to expose that be behavior on 17” et street ss and haven’t felt that. I do have a set of softer side walled Rs ready to go...so we’ll see
That’s a good idea, checking with SS guys that are running quick times. I think the eLSD definitely has something to do with the wiggle, which I think is magnified by the point made earlier (the stiff chassis) as well as the big 325 tires. I mean, with 325 tires there HAS TO BE some sort of tram lining in the rear. No??
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Old 09-10-2019, 10:40 PM   #151
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It's annoying they sell this and you have to go in for it to be flashed. More manufacturers need to get on the modern train and start doing OTA updates like Tesla. As they make software improvements, just let our cars download them. its freaking 2019. Imagine if you had to bring your phone, laptop or any device into the dealer each time you had to update it.
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Old 09-11-2019, 09:18 AM   #152
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It's annoying they sell this and you have to go in for it to be flashed. More manufacturers need to get on the modern train and start doing OTA updates like Tesla. As they make software improvements, just let our cars download them. its freaking 2019. Imagine if you had to bring your phone, laptop or any device into the dealer each time you had to update it.
I totally agree. Even if it's something that you had to pay for, it's not that hard to setup a store to make that purchase electronically. I would bet they would sell more of these updates/enhancements that way.
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Old 09-16-2019, 07:34 PM   #153
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A little update. I had the car aligned, and the side to side wag is gone. Hadn't been aligned in 2400 miles. Thay said it was way out of whack. Going to align it more frequently .
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Old 09-23-2019, 08:29 AM   #154
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So im having the eLSD calibration installed at the moment and Chevy is quoting me $415.00...$280 for the technology and an hours worth of labor. Anyone else have this same experience? Slightly different than the $350 i read about..
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