Jackfit

I came across this article on the clunking and skipping of tires in slow tight turns in modern Corvettes.

Is this effect eliminated in our generation of Corvettes...?


Here is the link

http://blog.patmcgrathchevyland.com/...ette-stingray/

Jack

dcamick

What generation are you referring too??

C6 Z06 have that effect.....At least my does (2006)..

Jackfit

Sorry, C-1 and C-2......up to 2014 I believe....as the article states....don't drive the car slowly fast.....lol....

Jack

dcamick

Jack, I drove a lot of C2 big Blocks and never noticed that..I have a C1 and have not noticed it.

I think it has a lot to do with the very wide tires on the C6Z. Reason being...When the Z was new the effect was pronounced. after 11,000 miles of road coarse and street driving, the effect seems to be minimized.

Best,

capevettes

It affects Corvettes after 2014 as well. My 2016 Z06 does it, but the only time I notice it is when I back out of the garage and turn sharply. You can feel the tires slipping. It has zero effect out on the open road. My Viper does it and my C6 Z06 did it. It is exacerbated by the extreme width of the tires. Never felt it in a Solid Axle or Midyear.

dcamick

ditto

AZDoug

It also has to do with tire width.

Put 10" wide front tires on your C2 and see what happens. When a tire gets wide enough, the inside of the tire rolls at a different rate than the outside of a tire relative to the ground in tight turns, so something has to slip.

Doug

GTOguy

1. Never drive slowly fast.
2. Never fry bacon naked.

tuxnharley

If I understand correctly the original Ackerman effect was talking about the difference in turning radius between wheels on opposite sides of the car. Now, with very wide tires it can happen between the sides of the same tire at low speeds and tight radius turns.

I notice this on my 2006 but not my 67

I think this is now also exacerbated by the flat tread profile and relatively square shoulder of modern wide tires.

ricks327

It was unsettling when I got my 2017 Z51 but you get use to it.

SledgeHammer 2.0

Okay........ so seeing y'all guys notice this and live up north. I bought the Misses a 2017 Grand Sport and I rarely drive it, but I did last week when it was cold down here. Making a not so sharp turn coming out of our driveway the thing sounded like the car was coming apart. I noticed it out of the rear, but it was bad, really bad. So bad, I got out of the car to see what I ran over.

I parked it and took it to the dealer Monday. It wasn't as cold on Monday, but the noise was still there. The Dealer says it's normal and all Corvettes 2006 up make the noise... I know that's bs, so I argued the point and they guy changed it to all 2006 up corvettes with wide tires and when it's cold.. whatever.

So, do they make that much noise? Or do I have other problems.

1900 miles on it so far.

SupremeDeluxe

I never noticed this on my 2002, 2006, or 2013.

capevettes

Check your rear end gear oil to make sure it's full. Some were underfilled. GM outsources the rear ends. They are filled before the supplier ships them to Bowling Green. They are then installed and once driven the level may go down. Some dealers check them as part of the pre delivery inspection, some don't.
It's not normal for the car to make a lot of noise making a not so sharp turn as you are getting underway.

SupremeDeluxe

There was also a TSB for a related issue many years back, my 2006 sounded like someone was beating on the diff housing with a hammer on low speed turns when I got it. There was a specification change for the gear oil, and after a fluid change it went away entirely.

6D2148

C1,2,3 have it built in, I never looked at anything newer. I get that the super wide tires are skipping, but hard to believe that ackerman theory is not built in to the new cars. It's not just a slow speed thing. Chip

capevettes

Yes, my 06 Z was making some rear end noise, especially when backing up. I changed it out at 4,000 miles with the GM synthetic gear lube which contains the friction modifier. Quieted right down.
Changed out my C7 Z rear end fluid at 3,000 miles but had never had an issue.

6D2148

Ackerman theory is built in to every spindle I ever saw, and if you want more, toe it out, if you want less, toe it in. If you want to go dirt sprint car racing or this new drifting deal swap L&R spindles for anti- ackerman and go fast

SledgeHammer 2.0

We picked it up today, I will check the fluid in the rear diff and probably change it or add some friction modifier.

The guys at the Stealership are just so full of chit. They flushed the transmission three times telling us that is the "fix" for the transmission shutter. The guy tells me in the past GM would swap out the transmissions and the shutter would still be there. The only fix is to flush out the transmission. ... SO Okay, I ask him when you swapped out the transmissions, would you put the old fluid back in? Well of course not!... So if all new fluid is the solution and putting a replacement transmission in with all new fluid doesn't fix it.... How is it the fluid?


(I love watching people squirm)

So then they tell me the new 8 speeds have a different kind of band in them, and when they build them the assembly lubricants were causing problems with the valve bodies.....

So the torque converter shutter is caused by the new bands assembly lube affecting the valve bodies?


My wife drove it home so I have no idea if it made the noise. I know my 02 Viper with wider stickier tires than her Corvette didn't make any noise, nor did her 08 Vette. It did, at full turn and low speeds, have what I call the "wobble" (guess the correct term was Akerman Effect) but it was never loud.

I will drive it this weekend and see what happens.

Easy Rhino

Sound advice, for sure, but I'll take your word for it (don't want to know how you discovered this bit of advice).

This, for my C6, too. Never in the C2. Has to do with tire width.

Wrong. My C6 that does this was my daily driver in Hawaii for over 5 years.

Post this concern on the C5, C6, or C7 forums.

SledgeHammer 2.0

Well, I asked CapeCod and Rick who both are from up North.

I just find it strange that a car we bought in Feb of 2017 (when it was cold) never had this problem till Jan of 2018... but it's normal