Something "Loose?"
Thread Starter
Instructor
Joined: Jun 2005
Posts: 158
Likes: 0
From: Brenham Texas
Something "Loose?"
Had the 08 up past the legal limit. road is slightly rutted. As speed increased the right rear felt "loose". It like a feeling of something is going to fall off. It wasn't a traction control issue this was after speed was achieved not at inception. The 08 is a Z51 4LT Auto PS.
Any suggestions?
Any suggestions?
Team Owner
Joined: Aug 2008
Posts: 25,582
Likes: 33
From: Chandler, AZ It's a Dry Heat.
Had the 08 up past the legal limit. road is slightly rutted. As speed increased the right rear felt "loose". It like a feeling of something is going to fall off. It wasn't a traction control issue this was after speed was achieved not at inception. The 08 is a Z51 4LT Auto PS.
Any suggestions?
Any suggestions?
Rutted roads can be deceptive especially at tripple digits with no real problems.
Alignment, loose lugs, suspension bolts - list goes on.
How about some more details?
Thread Starter
Instructor
Joined: Jun 2005
Posts: 158
Likes: 0
From: Brenham Texas
Lugs tight (135 lb/ft), air pressure 30 psi (digital gauge), axle nut tight, I have not checked suspension. Saving that for the Dealership, just need ideas from the brethren. Sometimes its better to be an informed customer rather than a customer at the mercy of the service writers.
The exhaust is stock NPP.
So what needs to be looked at with the suspension? linkages, all bolts tight and secure are obvious but how do you test this at speed?
The exhaust is stock NPP.
So what needs to be looked at with the suspension? linkages, all bolts tight and secure are obvious but how do you test this at speed?
Race Director
Joined: Aug 2008
Posts: 14,082
Likes: 1,592
From: Edmond Oklahoma
Just jack her up and start looking around underneath. Grab what ever you can and give it a good hard shake. If you don't find anything after checking the tires, lug nuts and undercarriage take it to the dealer if you are still under warranty. 
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Thread Starter
Instructor
Joined: Jun 2005
Posts: 158
Likes: 0
From: Brenham Texas
Thanks guys I am way still under warranty, time for the dealership.
BTW I am still trying to understand the 4 LT interior
comment. An attempt at a joke that needs more explaining please. 
BTW I am still trying to understand the 4 LT interior
comment. An attempt at a joke that needs more explaining please.
Le Mans Master
Joined: May 2005
Posts: 5,865
Likes: 2
From: Hope, Arkansas - '07 LMB Coupe
Cruise-In VIII Veteran
I'm guessing the joke is implying the more stuff you have on the car, the more things there are that can rattle?
The recomended lug nut torque is only 100 ft. lbs., the 135 you stated is more than I would apply to them. That would be about right for the axle nut though.
The recomended lug nut torque is only 100 ft. lbs., the 135 you stated is more than I would apply to them. That would be about right for the axle nut though.
Instructor
Joined: Aug 2004
Posts: 213
Likes: 0
From: Basingstoke England
If the car's OK on smooth roads and the "loose" feeling is just on rutted roads, then the most likely cause is wheel alignment. I've had wide-tyred cars in the past that were death-traps on rutted roads when the alignment was out, especially under braking.
Team Owner
Joined: Aug 2008
Posts: 25,582
Likes: 33
From: Chandler, AZ It's a Dry Heat.
Another idea would be to try the road in a similar car with similar tires. Don't know if you are a member of a local club or have friends with Vettes or not. I do know from experience that the wider the tires, the more sensitive they can be to a rutted road. Get the car checked out, of course, but a side by side comparison will give you another data point for reference with yourself and the dealer.
Burning Brakes
Joined: May 2008
Posts: 752
Likes: 28
From: Ottawa, Ontario
Was the road dry or wet. If wet was there any standing water.
It could be a rear toe alignment problem too. This can casue the car to dart around if it is out, making it a real handful. I once had this problem on a Porsche 944 and I could not drive it over 55 MPH in the rain.
It could be a rear toe alignment problem too. This can casue the car to dart around if it is out, making it a real handful. I once had this problem on a Porsche 944 and I could not drive it over 55 MPH in the rain.
SUBVETTE
Joined: Jul 2006
Posts: 3,841
Likes: 93
From: San Diego CA
one other possibility: I had that loose rear feeling in another car years ago, couldn't find anything loose mechanically, but ultimately sourced the problem to the tire which had evidently broken/failed belt(s). Replacement of tire cured the problem.
