CT5-V Blackwing: Slight Yaw/Rotation under hard throttle

[Savethemanuals]

Also experienced the rear end float recently. 3rd gear, onramp on to highway, not WOT but moderate throttle input and the rear end was dancing around a bit.

Any other feedback from folks who either ordered the SPL arms and/or had an alignment done?

 

[football76]

Have we ruled out the eLSD being a contributor to this feeling?

 

[SS_Shooter]

I installed the SPL toe arms and had my car aligned. That seemed to solve the problem. Before that, it was getting all crazy wonky under hard acceleration (in a straight line) in 3rd and 4th gear.

I do notice that if you have the suspension set to TOUR/SOFT, the car is a little more darty because the soft suspension setting allows for a lot of weight transfer to the rear under hard acceleration, taking traction away from the front wheels. Setting the suspension to 50% firm seems to solve that issue...

 

[Champale]

I installed the SPL toe arms and had my car aligned. That seemed to solve the problem. Before that, it was getting all crazy wonky under hard acceleration (in a straight line) in 3rd and 4th gear.

I do notice that if you have the suspension set to TOUR/SOFT, the car is a little more darty because the soft suspension setting allows for a lot of weight transfer to the rear under hard acceleration, taking traction away from the front wheels. Setting the suspension to 50% firm seems to solve that issue...

Ok I am ordering those tonight! It can't hurt, right?

 

[tmc]

My 4BW does this as well. Does someone make a similar piece for the 4?

 

[No Usury]

Recently posted about this issue myself; however, I thought it was simply a tire issue: New PS4S tires - How long before they have some bite?

Reading through this thread, now I am not so sure.

Short story – I was doing 65 on the freeway, lightly tapped on the throttle to go around someone, rear end breaks loose and goes side-to-side momentarily. Complete loss of control & traction.

Unlike some who have posted here, I was not WOT... just lightly tapped the throttle. Scary.

The reason I thought it was the tires is because I only have around 1.2K on the car now, about 900 miles at the time of the "incident."

FYI, I have a 2026 5BW with the Precision Package (upgraded toe arms/links).

Also, here is my current alignment, performed by a local race shop for "aggressive street" use.

Check the rear toe. You want around 3mm toe in on each side. I had originally messed up my rear toe and had toe out in the rear. You could feel the back end moving around under heavy throttle.

How do you translate mm into degrees? From what I have come up with, 1mm = .8 degrees, so are you saying I should have 2.4 degrees of toe in each rear tire?!?

The answer there is the solid bushings from the ZL1 1LE.

Which bushings exactly? P/N?

I had the same concerning feeling from day 1. I have tracked two other Blackwing 5s and it is not a characteristic of the vehicle. After getting home from Spring Mountain, I took my car directly to the dealer and the rear toe was "way off". Problem is solved, it feels so much safer!

Can you post your alignment specs please?

WANTED TO BRING THIS THREAD BACK UP...

After 10,000 miles, my CT5V is experiencing severe rear end wiggle when you jump on the throttle at higher speeds in 3rd and 4th gear.

There have been pretty significant discussions on this issue on the Blackwing Facebook Group and people have tracked it down to a couple of issues:

- Wheel alignment: Evidently the rear wheel alignment can fall out of spec and cause this issue

- Rear Toe Links: The reason the wheel alignment gets out of spec is due to the stock toe links not being strong enough.

In cross-discussions with the ZL1 Camaro guys, the Facebook posters found they were having identical issues with rear-end squirrelyness, and they had replaces their toe links with the SPL versions and it corrected the issue. One of the CT5V guys replaced his toe links and reported the car is much more solid now and the rear end doesn't kick to the side when he goes WOT at speed.

I attached a screenshot of his post which shows the stock toe arms and the SPL toe arm links side-by side.

The part they are recommending is: SPL Parts Toe Arms with Eccentric Lockout (Rear) - Chevrolet Camaro 2016+ / Cadillac CT5 Blackwing 2022+
Part Number: SPL-RTAEL-CAM6

link to the part is below:

SPL Parts Toe Arms with Eccentric Lockout (Rear) - Chevrolet Camaro 2016+ / Cadillac CT5 Blackwing 2022+

Check out the deal on SPL Parts Toe Arms with Eccentric Lockout (Rear) - Chevrolet Camaro 2016+ / Cadillac CT5 Blackwing 2022+ at Evasive Motorsports

www.evasivemotorsports.com

Here's what it says about those toe arms: "The stock eccentric bolts that allow for small toe adjustments tend to slip under high cornering loads, causing changes to the rear alignment. SPL Parts Eccentric Lockout (EL) kit eliminate the stock eccentric bolts to keep your rear alignment where you set it. SPL lockout plates are CNC machined from 6061-T6 Billet Aluminum and supplied with Zinc plated grade 10.9 hardware for absolutely zero-slip."

Please let me know your thoughts.

Curious how/if this applies to me, since I have the Precision Pack.

You guys must be on the track, because I can't imagine doing any kind of WOT in those higher gears, that's mandatory jail time around here!

OK, yeah, if you get caught, if they can catch you, yeah, I get it.

For me, it was a light tap on the throttle that caused the issue.

I'm came to my 5BW from a 2017 m6 ZL1 (not the 1LE). I never noticed the rear-end wiggle under hard acceleration with the stock Goodyear tires that came on the ZL1. It was only after I swapped out the Goodyears for the PS4Ss. I thought maybe it was the softer sidewall of the 4S that contributed to the backend moving around. I also noticed that the rear-end movement seemed to get worse as the 4Ss aged.

The 4Ss are superior to the Goodyears in the rain and cold but I'm not convinced they're the ideal performance tire for the ZL1 and 5BW. The softer sidewall might be fine on the lighter Corvette but on a heavier car like the ZL1 and 5BW there might be too much flex.

I have a hard time believing that the PS4S has a soft sidewall, especially with XL load ratings. Where are you getting your info, or why do you say this?

I installed the SPL toe arms and had my car aligned. That seemed to solve the problem. Before that, it was getting all crazy wonky under hard acceleration (in a straight line) in 3rd and 4th gear.

I do notice that if you have the suspension set to TOUR/SOFT, the car is a little more darty because the soft suspension setting allows for a lot of weight transfer to the rear under hard acceleration, taking traction away from the front wheels. Setting the suspension to 50% firm seems to solve that issue...

Interesting, may have to try this.

Anyone here have any suggestions?