[travislambert]

Originally Posted by utsteve98

Is this a true issue or is it the fact that the 1st gear ratio is 2.29? There are many cars out that that even their 2nd gear has a lower ratio. I'm sure if I took off from second in my current car I would have the same issue you all have on a hill.

I think if the gear ratios alone were the issue the problem would be consistent. There seems to be a timing aspect to the hill start assist from my experience at least.

I'd guess the hill start assist issue stems from the brake simply being slow to respond. I know setting and unsettling the parking brake seems to take a lot longer than I'd expect.

I've found that if I let off of the brake and just wait about a second before trying to take off, I can work around the suboptimal hill start assist.

(Perhaps a ratcheting type mechanism to allow the car to move forward freely would work better than a traditional brake for hill start assist?)

[Stoner]

Originally Posted by utsteve98

Is this a true issue or is it the fact that the 1st gear ratio is 2.29? There are many cars out that that even their 2nd gear has a lower ratio. I'm sure if I took off from second in my current car I would have the same issue you all have on a hill.

This is a much larger issue then just a tall gear set. We regularly drive our cars have a clear understanding of what is normal, and what is a serious reduction in power. I don't know about everyone else, but I consistently start out in first gear and have a pretty good feel for the amount of throttle needed. Starting out on a hill is not an uncommon accurance for me, and I do not have the same issue in any of my other cars or trucks.

I have no idea why there is an issue after hill assist kicks in. After applying throttle and the hill assist releases and the car fails to accelerate, I will push in the clutch to increase RPM. The car will start to roll back slightly, so I know hill assist braking is no longer in play. there is still a distinct reduction in power. I wonder if there is an algorithm built into the system to keep you from over accelerating and spinning the tires on a hill start?

Will be interesting to see if the issue exist in sport and track mode.

[sengli]

I have owned multiple M6 GM cars recently. This new ZL1 is the flakiest thing to try and take off in, that I have ever tried. I only have 550 miles on mine and it revs the engine all over, the place when you try to engage 1st gear on take off. And it seemingly does it on its own. I havent stalled it yet, but it sounds as if it going to die constantly when engaging the clutch. The car is new and still breaking in.

[FringBirdAloha]

Originally Posted by sengli

I have owned multiple M6 GM cars recently. This new ZL1 is the flakiest thing to try and take off in, that I have ever tried. I only have 550 miles on mine and it revs the engine all over, the place when you try to engage 1st gear on take off. And it seemingly does it on its own. I havent stalled it yet, but it sounds as if it going to die constantly when engaging the clutch. The car is new and still breaking in.

Same here!

[travislambert]

I browsed the forums a little bit and so far I've found several '17 ZL1 owners who have expressed concerns similar to what's being described in this thread.

1. travislambert
2. Shorty45
3. popsmk
4. FringBirdAloha
5. Zach495
6. Infern0
7. Evolvedx27
8. bobby35ny
9. GarnetRedJuan (A10)
10. rasracin
11. Stoner
12. sengli
13. IKILLEDSUPERMAN_ZL1
14. Getinthur
15. cwebster
16. mlee (A10)
17. Lashu74
18. 17ZL1Camaro
19. Tara Martin
20. Repman

If your username isn't listed and you have experienced issues with unexpected timing pulls/bogging with the '17 ZL1 that go beyond what you'd consider normal, please post your experience/observations and I'll get your name added.

I plan to show this list to the Chevrolet reps at Camaro Fest to help give some credence to the issue. Hopefully this will be useful for them in prioritizing the investigation into the problem.

(And of course, if I've somehow misunderstood your post(s) and you'd like your username removed, I'd be happy to do that as well.)

[GarnetRedJuan]

Originally Posted by travislambert

I browsed the forums a little bit and so far I've found several '17 ZL1 M6 owners who have expressed concerns similar to what's being described in this thread.

1. travislambert
2. Shorty45
3. popsmk
4. FringBirdAloha
5. Zach495
6. Infern0
7. Evolvedx27
8. bobby35ny
9. GarnetRedJuan
10. rasracin
11. Stoner
12. sengli
13. IKILLEDSUPERMAN_ZL1
14. Getinthur
15. cwebster

If your username isn't listed and you have experienced issues with unexpected timing pulls/bogging with the '17 ZL1 M6 that go beyond what you'd consider normal, please post your experience/observations and I'll get your name added.

I plan to show this list to the Chevrolet reps at Camaro Fest to help give some credence to the issue. Hopefully this will be useful for them in prioritizing the investigation into the problem.

(And of course, if I've somehow misunderstood your post(s) and you'd like your username removed, I'd be happy to do that as well.)

Thanks for including me in the list, but I am an A10, which I think makes the situation much more valid. It's tied to all ZL1's.

[travislambert]

Originally Posted by GarnetRedJuan

Thanks for including me in the list, but I am an A10, which I think makes the situation much more valid. It's tied to all ZL1's.

Sorry about that. I tweaked the post a little to be more accurate.

[mlee]

Originally Posted by travislambert

Sorry about that. I tweaked the post a little to be more accurate.

I agree it's not just an M6 thing and is my biggest struggle too.

[Evolvedx27]

I really hope this situation gets fixed with a recall soon...

[bmlocal175]

Does this happen on the SS as well?

[travislambert]

Originally Posted by bmlocal175

Does this happen on the SS as well?

I never noticed it on my '16 SS when I had it. Of course, I only drove it a few times before I did the engine swap and tune.

After the LT4 swap and tune I certainly didn't notice an issue.

The SS was much easier to accomplish a smooth take off from a stop, and I'm pretty sure it would out 60' the ZL1 on an aggressive start too. Of course traction was a bigger challenge on the SS, but at least it didn't nose dive.

Also, the behavior of the SS with the 1LE package may be all together different. I have no experience with this configuration.

[Lashu74]

You can add me to the list as well I am having the same issues.

[Sooner Cole]

Add me to the list as well. (2017 Zl1 M6)

[travislambert]

Originally Posted by Lashu74

You can add me to the list as well I am having the same issues.

Originally Posted by 17ZL1Camaro

Add me to the list as well. (2017 Zl1 M6)

Thanks guys.