[IneedAZ]

Finally getting it done. Have an APPT for July 6th weather permitting. Figured I would do the elsd cal prior to the engine mods.

[Mark R]

Originally Posted by IneedAZ

Finally getting it done. Have an APPT for July 6th weather permitting. Figured I would do the elsd cal prior to the engine mods.

I had that done and noticed no difference.

[IneedAZ]

Originally Posted by Mark R

I had that done and noticed no difference.

Your launches were the same? What mode did u launch with? What power level were u when u last tried it?

[AZ_1LE]

Originally Posted by Krowser

Most of you may not know this, but the main suspension bolts are torque -to-yield "TTY".....this means they are a one time use only!!!

Every time you align your ZL1,SS, SS 1le or ZL11Le, you should be using BRAND NEW GM bolts (if you are using stock bolts). THE BOLTS MUST BE AT THE PROPER TORQUE SPECS.

If you have your car aligned using the old bolts, you may experience irregular rear end pulls during WOT, sweeps, uneven pavement etc...etc.

The other reason you may experience unusual driving characteristics during spirited driving is the tire conditions, diff fluid, or tire pressure may be off for what you are trying to do...

...stock is 650lbs tq at the crank...that's alot for a stock car.

Just my $.01.5....

The only bolts in the suspension which get touched during an alignment and which are TTY are the ones for the rear toe. The rest are reusable.

[Mark R]

Originally Posted by IneedAZ

Your launches were the same? What mode did u launch with? What power level were u when u last tried it?

On the drag strip in track mode, it launches just fine. On the street, I am always in sport mode, which is when I get a little wig-wag. I have tried turning TC off, and that helps quite a bit.

[IneedAZ]

For those that had this done, can you confirm it is done thru the ecm. I was told by dealer they plug a device into obd port that communicates to gm via satellite for the download.

[manders500]

Originally Posted by 7WSM

Go to the dealership and tell them to reprogram it. The cost is fixed at 350.00. Document ID highlighted because advisors will not have a clue what the hell you are talking about.

I know that this is old, however, I took my new to me '17 ZL1 and they were still clueless. Claimed that I had to order a kit?

[brad65ford]

Originally Posted by Alain

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.

Originally Posted by Krzfst

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

Originally Posted by 17CamaroZL1

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.

Originally Posted by 6spdhyperblue

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

Originally Posted by IneedAZ

For those that had this done, can you confirm it is done thru the ecm. I was told by dealer they plug a device into obd port that communicates to gm via satellite for the download.

Wow came hear for multiple reason and going to leave more frustrated. Just picked up a used (unmodded 18 zl1) love the car but hate the rear wiggle / wag what ever you call it its not right feeling. Scheduled an appoint with a local dealer for this eLSD flash but no one has commented if it helped or addressed the rear movement under heavy loads. I to would think is has to do the the eLSD. Assuming only way to now if have the e diff locked sold some how and attempt the same hard runs to see if it has the same wiggle etc.. Anyone have any positive updates?

[JSH]

Here's the link to the update info https://gm-techlink.com/?p=11978

Basically, this CCM update reduces or eliminates eLSD rear bias.

I've been trying for several months to find a Denver area dealer to do this with no luck. No one knows anything about it. You would think GM could provide this with little effort but not so.

Does anyone know of a dealer anywhere that knows this update?

[Mark R]

There really does not seem to be a hard and fast consensus on an absolute cure for the wiggle. Here are the options that have been hit or miss, depending on who is posting about their experiences.

Alignment with TTY bolt replacement is a prerequisite.

Good, properly inflated tires.

Rear suspension upgrades, especially rear bushing stiffening with lock out kits or full 1LE bushings, toe rod replacement, and control arm replacement.

Then the E-diff upgrade.

[Robster]

Originally Posted by brad65ford

Wow came hear for multiple reason and going to leave more frustrated. Just picked up a used (unmodded 18 zl1) love the car but hate the rear wiggle / wag what ever you call it its not right feeling. Scheduled an appoint with a local dealer for this eLSD flash but no one has commented if it helped or addressed the rear movement under heavy loads. I to would think is has to do the the eLSD. Assuming only way to now if have the e diff locked sold some how and attempt the same hard runs to see if it has the same wiggle etc.. Anyone have any positive updates?

My car does the wiggles during a hard launch when the rears are getting old-ish. It pulls straight and steady with fresh rubber.

[Z OH 6]

BMR cradle lockout kit will go a long ways to curing the rear end wiggle assuming you don't own a 1LE which doesn't need it.

[JSH]

Originally Posted by Z OH 6

BMR cradle lockout kit will go a long ways to curing the rear end wiggle assuming you don't own a 1LE which doesn't need it.

Have you had this eLSD update done to your car? I'm still trying to find a dealership to do it.

[airtroop01]

I have been waiting for one of you guys who got this done to come back and say wow it worked or meh not so much.

It appears to only work if you turn off traction control and ESC.

I’ve been in the camp that most of these cars need a proper alignment, those TTY bolts replaced or the rear toe arms swapped along with a carrier bushing set.