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

[SS_Shooter]

UPDATE TO POST #39: Car still bricked from trunk opening software update....

 

[quikag]

UPDATE TO POST #39: Car still bricked from trunk opening software update....

Hope you have a Blackwing loaner or at least a V or Escalade.

 

[SS_Shooter]

UPDATE TO POST #39: Car still bricked from trunk opening software update....

UPDATE: Car still bricked. It's been a couple of weeks now... They say they are working with Cadillac on a solution, but that could take another 7-10 days.

 

[5VBW Nick]

Unbelievable!

 

[hawk02]

I don't understand why they're not sending a replacement ECM? That would seem to be the fastest and easiest fix.

I had a bad ECM on a 2015 Chevy Silverado. Dealer order a replacement, tied it to my truck's VIN and 2 days later I picked up the truck.

 

[1Evil55]

Can you lemon it and find another on the lot?

 

[SS_Shooter]

I don't understand why they're not sending a replacement ECM? That would seem to be the fastest and easiest fix.

I had a bad ECM on a 2015 Chevy Silverado. Dealer order a replacement, tied it to my truck's VIN and 2 days later I picked up the truck.

Ha! Me neither.

Can you lemon it and find another on the lot?

No, because I bought it in TX from Sewell.

Note: I am getting irritated, but not TOO much, as the car still has summer-only tires on it and the weather is shitty... So, I wouldn't be driving it anyway. But still, what a SNAFU...

 

[5VBW Nick]

Any updates? I want to know if you got it fixed and how the new suspension arms changed things!

 

[flipray]

Any updates? I want to know if you got it fixed and how the new suspension arms changed things!

Same, few folks have said that fixed the swaying on theirs from the few FB groups. Basically similar issues from what the V3 guys experience. Seems to be not as bad since V3 guys ends up replacing every rear arms, not jus the toe arm to fix the load deflection issue.

And thats why Ive been tracking this, I wanna know if Im going to replace just the rear toe arms. Contemplating on replacing more and get more alignment adjustability, maybe even zero out my camber since im at about -1.

 

[SS_Shooter]

Any updates? I want to know if you got it fixed and how the new suspension arms changed things!

Sorry for the delay.

After 3 weeks of downtime, they fixed the software installation glitch, and I did get the car back. The weather hasn't been great, but I have had a chance to do some minimal testing.

My impressions:

- The SPL toe links seemed to have calmed down the extreme dartiness of the car when jumping on the throttle at speed in 3rd/4th gear. Rear end is much more planted than it was.

- There is still some directional change if you jump on the throttle at speed with the the suspension set to 'soft'. It seems like that is a result of the big weight transfer to the rear causing floatiness in the front.

 

[Kevin0311]

Alignment wasn't checked prior to installation of toe links just after?

 

[SS_Shooter]

Alignment wasn't checked prior to installation of toe links just after?

You measure the toe links when you install them to basically mirror the measurements of the old ones. Following, you should really do a 4-wheel alignment. They didn't show me the before/after alignment results like some of the specialty alignment shops do...

 

[Kevin0311]

The reason i asked about alignment before was my ZL1 6th gen also had the extreme wiggle issue under hard acceleration, alignment alone fixed 98% of that, i do not remember the numbers but my guy just about maxed out the adjustment to get it center of green on the screen (Hunter) i was in bay watch/talking to him while he did, now its a pleasure to do hard pulls when traction allows.

 

[SS_Shooter]

The reason i asked about alignment before was my ZL1 6th gen also had the extreme wiggle issue under hard acceleration, alignment alone fixed 98% of that, i do not remember the numbers but my guy just about maxed out the adjustment to get it center of green on the screen (Hunter) i was in bay watch/talking to him while he did, now its a pleasure to do hard pulls when traction allows.

What the ZL1 people and some CT5V people were saying is that the original toe links were stamped steel pieces of crap with rubber bushings (which they are) and they tended to flex under acceleration.

They said that while some people had fixed the issue via an alignment, that was only a temp fix, as the issue returned after a while due to the original toe links presumably bending slightly or flexing during acceleration.

I'm not an expert on this issue; I got all of my intel from the Facebook Blackwing groups. A few guys over there are the ones that did the research and talked to the ZL1 people.

EDIT: All that being said, I did email the dealership asking for my before/after alignment sheet. It wasn't with the receipt.

 

[flipray]

The reason i asked about alignment before was my ZL1 6th gen also had the extreme wiggle issue under hard acceleration, alignment alone fixed 98% of that, i do not remember the numbers but my guy just about maxed out the adjustment to get it center of green on the screen (Hunter) i was in bay watch/talking to him while he did, now its a pleasure to do hard pulls when traction allows.

V3s were notorious for it too. Somebody who made cradle lock out kits made a clip with a camera inside the wheel well that showed the deflection underload. You can see the arms bend and see the wheel shift to toe out. Thats what causes the rear end sway, even if alignment is good, its not accounting for that deflection when it loads.

 

[DriverDaily]

I test drove a used CT5-V BW with 10K miles and immediately noticed this. It’s very disconcerting considering how much power there is.

 

[SS_Shooter]

Alignment wasn't checked prior to installation of toe links just after?

Kevin, I did get the AFTER alignment specs from the dealer.

I'm not sure why some of them are in red....

 

[Kevin0311]

Surprised the dealer was satisfied with those numbers watch for inner tire wear if daily driver.

 

[shbox]

Kevin, I did get the AFTER alignment specs from the dealer.

View attachment 29020

I'm not sure why some of them are in red....

Red means out of stock spec.

 

[SS_Shooter]

Red means out of stock spec.

I figured that. Negative 2.5 degrees camber is what is recommended for 'track use'. I'm not sure why they used that spec.

These tires have 13K miles on them, so I don't know how long they have left anyway...