Not normal, but sadly not uncommon in this car. Search rear end loose in forum. You need an alignment. Also search Nordlock washers. You'll need these as well to prevent recurrence.

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Great... can you (or someone) please tell me what language I need to use when communicating this to the service department?

Pissed about this, because this is happening from day one and my car stalls at WOT. Not the best 1st month ownership of a new car...

 

You sure it's not a V2 you're driving?


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I had a V2 that felt like this, one of the rear Lower control arm bolts needed an extra half turn of tightening and it fixed everything. Just make sure that all bolts around rear suspension are torqued to spec


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Guys, need help. Dealer could not replicate the issue discussed in this thread. I need to go on a test drive and show/explains what is happening.

I need to be able to articulate what is happening during a test drive when my rear end starts sliding at acceleration for no reason (no traction control kicking in and no loss of traction). For those who are familiar with this issue on V2 and V3, how do I properly describe (what words to use and what parts to reference) to a tech when the issue comes about?

I have a feeling it is one of those things where the dealer doesn't see what I'm talking about, so they are telling me it must not exist... but my rear axle is all over the place at acceleration as if it is being pulled in different directions.

 

What have you tried so far to fix? I was going through this on my V3 and was about to sell it. Did you try alignment? What tires are on it? I finally figured mine out and it ended up the last guy tuning my car unhooked sway bars Car was scary to drive at high speed

 

Can you mount some cameras under the car and record. This might help you document and show the dealer what is going on


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I don't know about where you live, but here the roads are so shitty that there are ruts in the lanes from so much traffic, and I find that a vehicle with wide tires will follow that and wander some. thus feeling like its loose when you get into it.

all of my V's have done it as well as my C5

 

A few things might help here. What year is the car, miles, tires, and wheels? A dealer is not keen on taking a car out and doing 75 then going WOT so it's going to be hard for them to reproduce the issue.

This could be any number of issues on an IRS car like the V. Even bad shocks could cause it and with the mag shocks it's hard to tell sometimes if the are bad. Even a bad alignment with a bad thrust angle.

 

if its a V3 it shouldn't have any worn out parts on it.

 

Have you tried the car with drag radials on it? The factory traction control on my V2 does allow a certain amount of wheel spin at WOT which causes the car to fishtail somewhat. Also check tire pressures in the rear. My V2 has a very slow leak in the left rear tire and when it gets low (around 29 PSI) it causes a similar sensation.

While I am not a suspension expert, I also mention trying it with drag radials because years ago, I had an 11 second Buick Regal T-Type (solid rear axle) that would do this in the rear from around 70 MPH on up. It would not do this at the drag strip with slicks on it.

Good luck. Hope this helps.

 

My car is 2017.5 (latest 2017 revision), 1 month old with 1.4K miles. I noticed this issue since day one.

 

Since it appears this issue is right out of the box, are there any aftermarket bushings available if someone wanted to switch them out for a stiffer/more accurate ride?

 

Was told by the Service Manager that this is normal operation by the traction control as it is managing the rear wheels. He said the traction control is managing rear wheels even when the TC light is not flashing yellow. At this point I guess I will just wait and see until I go to the V Academy and have a chance to drive other Vs and talk to the drivers there.

 

Mine doesn't do that. Take a test drive with a tech and tell him that other V3 owners have stated this is not normal. Doesn't happen to me in tour, sport or track mode. From a dead stop, that's different. It shouldn't do that on the highway already moving at speed. I do this everyday and multiple times a day.

Maybe try a different dealer that has more experience with V3s. The problem is our cars are such a low volume production, that most dealers have little to no experience with them. You could also go to a Chevy dealer that has Z06/ZL1 experience and see if they can find the problem. Have a tech go over the entire rear suspension and make sure everything is torqued to spec. This is what I would do if I were in your position. Sounds like something under there was left loose at the factory.

 

Has car ever been strapped down on a trailer, rollback or dyno?

 

Hm... my dealer had the car delivered from another state. What made you ask?

 

[emoji848]now that you mention it, mine does this also....


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My V2 did this with MPSS tires, and 3rd gear stabs around 60mph with TC full-on, and with TC in comp. mode. It felt like I was on ice back there, side-side slipping feeling.

After moving to MT SS DR's, the rear still sways side-side a little bit on pulls, but it doesn't feel like it's slipping anymore. It goes to one side and grabs, and then the other side and grabs. This action happens so fast though. Much better with DR's!!

I think it's the lsd's aggressiveness, paired with a lot of torque, paired with MPSS.

I had a 500+ fwhp DSM (before converting awd) with a Quaife LSD. The torque steer was so bad at peak torque, I could feel the lsd searching for grip. Now imagine that but in the rear of the V with IRS. A lot of caster and toe force is being exerted back there, that's a partial reason why you have to use nordlock washers and a lot of bolt torque on everything.

 

mine doss that ...could it be worn tires?

 

There are sensors on each A-arm. They break super easy.

 

Wouldn't a broken sensor that throw a code? My car was checked for all codes and it has none.

 

In terms of language to talk to your dealership, I would simply find a road or corner sequence where this happens and take your dealer for a drive there. In my v2 it was very clearly unstable.

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Any car with wide tires is going to 'track' with the road but I think what we're all describing is something quite a bit more pronounced. I felt it when the car was stock, and it got a lot worse after I lowered the car. Even though I didn't change any of the alignment eccentric bolts, my alignment was quite a bit off, and after having the dealer do a freebie alignment back to spec, it's SO MUCH better.

I'd have the dealer check alignment, and while they're under there, nut-and-bolt all the suspension bolts to spec and check sway bar endlinks and Mag-ride potentiometer linkages. Like flntv said, if the potentiometer is plugged in but the linkage is broken, it won't throw a code.

 

All weird rear pulling stopped once I put the car in TRACK mode. I used TRACK mode with TC off and loved it, but only on the track.

However, I tried running TRACK mode on with TC on and found the car to be very much drivable on the street without the electronic diff sending power to different wheels and with less bogging down by ECU. It now feels like a proper rear drive muscle car, albeit with more even slip in the rear.

 

Mine had that but I didnt think its that big issue. Then I had some metal to metal noise in the front suspension while the car was under 1k miles. I went to the deal they tighten every bolt in the suspension and a reallignment was done. Now no issue at all, the loose feeling nearly gone.

 

Did you ever figure this out? I just bought a 2019 and the rear end feels scary. At first I thought it was somehow correcting itself while spinning tire like you or that my lane assist was going nuts. After turning all the assistance off and getting the feel for the car I’m convinced now something is seriously wrong. I’ve had a lot of performance vehicles and nothing has felt this sketchy to rip on haha. Any feedback is appreciated!

 

Me and others have numerous threads on the fixes. Search...