[Z OH 6]

Originally Posted by pauly1119

On the street, I have a nice loop mapped out I enjoy running weekly so it’s a road I’m very familiar with. Started feeling the back sway back and forth the last few months. Usually going from 3th to 4th hitting some good speeds for a short burst.
I did play with the traction settings the other day but it’s a pretty big loop. I’ll try again Monday. I do think it improved it.

Did it do it with the OEM tires?

[pauly1119]

Originally Posted by Z OH 6

Did it do it with the OEM tires?

No it didn’t but it also didn’t do it when I changed the tires at first either, it just started for really no reason. It almost always happens from 2nd to 3rd shifts around town when I’m playing around but I really don’t get to high speeds then.

[Z OH 6]

Originally Posted by pauly1119

No it didn’t but it also didn’t do it when I changed the tires at first either, it just started for really no reason. It almost always happens from 2nd to 3rd shifts around town when I’m playing around but I really don’t get to high speeds then.

I'm inclined to believe it's the tires. Maybe they're just wearing down and losing some grip. I just replaced my GY SC3 rear tires today, they were down to 2/32" and I was starting to get some shifting under hard throttle. After replacing the tires today, it's gone. I know when the previous set was new, I didn't have that issue either, only after they're were really worn.

[pauly1119]

Originally Posted by Z OH 6

I'm inclined to believe it's the tires. Maybe they're just wearing down and losing some grip. I just replaced my GY SC3 rear tires today, they were down to 2/32" and I was starting to get some shifting under hard throttle. After replacing the tires today, it's gone. I know when the previous set was new, I didn't have that issue either, only after they're were really worn.

I have PS4S now with about 1K miles on them, maybe even a little less. Honestly they still look new. The car felt faster with the GY’s but was always very stable.

[Z OH 6]

Originally Posted by pauly1119

I have PS4S now with about 1K miles on them, maybe even a little less. Honestly they still look new. The car felt faster with the GY’s but was always very stable.

Considering the only change you've made is the tires and it started soon after. I can't help but think it's the tires.

[pauly1119]

Originally Posted by Z OH 6

Considering the only change you've made is the tires and it started soon after. I can't help but think it's the tires.

I played with the performance traction settings today and found the race setting reduced it considerably. I did 4 pulls 2nd to 3rd and 3rd to 4th……2 each and found the race setting kept the back pretty straight. The other settings I was still getting the back and forth motion. I’m going to play with it some more but didn’t want to push my luck on the off-ramps too much on a Monday.

[Mark R]

Originally Posted by Z OH 6

It's really not about looks but strength. I've seen people bend and even break BMR tubular steel control arms on Hellcats but I've never seen it happen with the stock stamped steel pieces even though the BMR pieces look much beefier. I think a lot of people get wrapped in the looks of an aftermarket piece and assume it's better because its bigger. I will admit that poly bushings can improve defelction some over rubber bushings but my point was that for road racing, GM already engineered suspension pieces that are more than good enough. You would gain more from taking track driving lessons than from swapping suspension components on these cars.

As I stated before the cradle lockout is a necessity for better performance except on the 1LE, the other parts not so much.

I'm catching up to this conversation and can understand your viewpoint. However, here is a video from BMR of an SS, showing lots of suspension flex from the stamped control and trailing arms. On a Zl-1, the flex is much more:



I'm going to disagree about the suspension pieces being engineered as more than good enough. GM engineered the suspension to a price point. That's why the BMR pieces make such a significant improvement when they are installed.

As far as Hellcats breaking BMR pieces, I can't speak to that.

[Z OH 6]

Originally Posted by Mark R

I'm catching up to this conversation and can understand your viewpoint. However, here is a video from BMR of an SS, showing lots of suspension flex from the stamped control and trailing arms. On a Zl-1, the flex is much more:



I'm going to disagree about the suspension pieces being engineered as more than good enough. GM engineered the suspension to a price point. That's why the BMR pieces make such a significant improvement when they are installed.

As far as Hellcats breaking BMR pieces, I can't speak to that.

And I got to disagree with you because if the stock pieces flex tremendously, the car wouldn't handle well at all and we know that's not the case with these cars. I see no bending or flexing of the stock metal arms, what I do see is some rubber bushing deflection which is normal. That being said, I've already stated that poly and solid bushings will reduce or eliminate deflection of the suspension. Now I'm going to open a new can of worms for you to think about. Lets say you get the suspension deflection sorted out, what connects the vehicle to the road? A RUBBER tire. Tires have their own levels of deflection as well and you're not going to solve that easily without running a Mickey Thompson ET Street R for drag racing if wheel hop is your concern.

[radz28]

I'm starting to think there is an engineered compliance in the OEM arms themselves. I wonder if not only do the rubber bushings contribute to spring rate, but the arms, too, because can all those arms move in their respective arcs in complete synchronicity? I recall a Member here state that the rubber OEM bushings do add in some spring rate, which makes sense, and when I thought about it more, I started thinking maybe the arms contribute, too. I don't think anyone's arguing the arms flex pretty easily. Perhaps they were engineered to do so, and it's totally fine because the arms are of an alloy that they return to their normal shape.

I know I don't like slop in the suspension, and will, and am, giving up a little compliance as a result, which I accept. I'm not sold on them being the culprit here, but I am basing that on a little experience I've had so far. And that came down to the tires - mostly...

[ZL1Ray]

I had the same problem when I first got the car. I am running Michelin 4s and it went away after I got an alignment.

[pauly1119]

Originally Posted by ZL1Ray

I had the same problem when I first got the car. I am running Michelin 4s and it went away after I got an alignment.

Thats my plan, got a price from Chevy today for 119.00. Sounds low, do you remember what you paid?

[ZL1Ray]

Originally Posted by pauly1119

Thanks my plan, got a price from Chevy today for 119.00. Sounds low, do you remember what you paid?

Sounds about right I took mine to les schwab since it was close and paid a little less then that.

[pauly1119]

I finally brought my car to Wallace Chevy in Stuart. Lionel did my alignment, it was off. He set it back to factory specs and the car feels like it did the day I picked it up. Stays nice and straight under throttle in any mode I want to be in. So in my case it was definitely the alignment.

[mlee]

Originally Posted by Z OH 6

I'm inclined to believe it's the tires. Maybe they're just wearing down and losing some grip. I just replaced my GY SC3 rear tires today, they were down to 2/32" and I was starting to get some shifting under hard throttle. After replacing the tires today, it's gone. I know when the previous set was new, I didn't have that issue either, only after they're were really worn.

In my 2017 I tried different tires with no help at all. Mine consistently went side to side under hard throttle and got worse with MT DRs. So bad under a full launch I could barely keep it in my lane. Tires are not the issue but may very well be alignment. After I had it aligned and bushings replaced it stopped but I also didn't keep the car very long after that to really test.