[Badmojo]

If it's on factory tires, then you can't always hear them spin.

[Tampabucs4]

But my car did prior to mickeys too

[17CamaroZL1]

Mine feels super planted unless the tires break loose. It typically doesn't break loose above 40 mph unless it's cold out, then it can get sideways at 60 or better!

[Tampabucs4]

It’s wierd it’s not the back that’s leading the left to right. It the front thy feels it. Maybe alignment issue

[Boosted4life]

I feel it and I'm on stock tires. I figured it was the tires following the grooves in the pavement

[Stress]

Originally Posted by Tampabucs4

Has anyone zl1 felt like it’s floating left to right when flooring at high speeds say 50+?

Yes, same here. Your description is spot on. Gets spooky on a narrow road. I've been trying different tire pressures and will check alignment next.

[Ricco]

Check your tire pressures. I had this symptom on a different car and it turned out that I had a slow puncture in one of the rear tires.

[URBAN LEGEND]

I have that situation as well. I am about the move the rear bar one link forward as the manual says to see if this gets sorted out. I want to punch it at 70 mph and be confident that all is well. Manual for the ZL1 1LE says one link forward helps cure oversteer.

[speedraider]

Originally Posted by ninetres

Having mis-matched tread/sidewall mis-matched front-back can contribute to the car walking on some surfaces. Even some matched treads will walk with grooves in the road surface.

100 % right, rear wheels have more flex than fronts. Gets scary at high speeds. I had this problem with nitto nt05r on my vette, had to put nt05 in the front, problem solved

[Jmueller]

100% have felt this and the first few times it happened I puckered up pretty good. It’s a dramatic feeling and really seems like the car is just about to lose control. Stay in it and it goes away, but it makes the first 1/2 second of full throttle pretty scary.

I figured it was tire sidewall flex. Really would like to get this issues resolved.

[Jmueller]

Originally Posted by speedraider

100 % right, rear wheels have more flex than fronts. Gets scary at high speeds. I had this problem with nitto nt05r on my vette, had to put nt05 in the front, problem solved

This is not a mismatching tire issue. This happens on stock ZL1s with newish factory tires. I can’t say if it happens with different tires. I have had mismatched tires causing float on other cars. That feeling is present all the time with any steering input at highway speed. The feeling others and myself are talking about happens when going full throttle while already at highway speed. It’s different than mismatching tires.

[Fraxum]

Could part of it be bushing compression?

[cwebster]

Originally Posted by Tampabucs4

Has anyone zl1 felt like it’s floating left to right when flooring at high speeds say 50+?

From day 1 my car had a tendency for rear-end to slide right during burnout and if I lost traction on a launch or gear shift at full throttle. It would also tend to steer left at WOT. When I first ran my Mickey Thompson DRs it was way worse. With DRs it would also tail-wag on the big end over 90-130 MPH - felt like it was gonna go sideways. At first I thought it seemed like an eLSD issue - favoring one side.

I now believe the tendency to slide right or steer left was a biased thrust angle caused by a poor 4-wheel alignment from the factory. I recently had a complete alignment done and it's rock solid now. I feel like the tail-wagging was definitely the taller sidewalls (F/R mis-match) on the DR's flexing at high speed.

In competition modes, the tight suspension will follow cracks in the pavement too, giving the car a tendency to shift right or left depending on where it engages uneven or cracked pavement.

I think most of the complaints of the front-end shifting side to side will be suspension issues, whereas rear-end float would more likely be sidewall / tire size mismatch or alignment issues. ZL1 1LE may be able to compensate some with their user adjustable suspensions but should probably check other common causes first.

--Cal

[ReefBlueCoupe]

Mine does this - feels to me like the ELSD and TC as others have said. There's really nothing else it could be. It's an instantaneous back-and-forth of the rear that lasts for 1/2-1 second at WOT or hard acceleration while the car is already moving. It sorts itself out after that.

Keep in mind we are dealing with GM-level refinement and calibration of a complicated system trying to manage 650 ft-lbs, not Italian-supercar-level refinement and calibration. Either the calibration was rushed, the engineers didn't encounter this scenario during development (unlikely), or the processing of I/O from/to the ELSD unit/TC system just isn't happening fast enough (processing is too slow). It'd be great if there were an updated calibration to take care of this, but I haven't heard of anything. Then again, if it's not the calibration but is instead the processing speed that's the problem, nothing but swapping ECU components will fix that.

It's never felt out of control to me, but was unnerving the first few times I went WOT from a roll and didn't expect it.

I've felt mechanical diffs do this on the dragstrip in the past, but usually it's WAY more pronounced and doesn't go away, and with big drag tires and big sidewalls, things can get out of control quickly. Hence why we have spools and Waveloc/similar for high-hp cars accelerating hard.