Front end drift/float @ speeds above 50mph
Hi all. I'm a long time lurker who finally made the jump to being a member. I'm the 3rd owner of a 102k actual miles, L46/M21 '69 convertible with a set of G60 Goodyear PolyGlas tires. I've owned the car for several months now and love it, it's such a blast to drive. Everything works but the one issue I have is that the car can be a little squirrelly as you approach highway speeds. It drives pretty straight with only the slightest pull to the right (so slight it's almost not noticeable and I even hesitate to mention it). However, as I get up to speeds of 50mph and greater it seems to have a drift or float in the front end or at least I think its coming from the front end. What I mean by drift/float is that without hitting a bump, groove in the pavement or whatever, @70mph I'll suddenly find myself going from the center of my lane to 6" into the lane next to me, without any input to the steering wheel from me. This could be either the lane to the left or the right. It's like something is loose in the front end allowing the wheels to go one direction and the suddenly the slop or looseness allows the wheels to shift orientation ever so slightly the other direction (I hope that long rambling explanation makes sense). I thought for sure that it must have a bad bushing(s), tie rod end, ball joint or something. Since I couldn't locate anything, I took it to the front end shop and had them take a look. They took it for a drive and said they experienced exactly what I described but they found everything up front was tight as a drum and said all the bushings looked better than what they see in most 5 year old cars. The only recommendations the front end guys had was to ditch the PolyGlas tires (which was already on my to do list) and talk to someone who knew C3 cars and see if they had any suggestions. So that leads me to here, reaching out to this community for any input on what you think the root cause might be or where I should start looking next to find what's causing the problem.
Thanks in advance for sharing your knowledge - Kevin |
Well, welcome to the forum. First of all Those tires have not been made in this century, they're dangerous.. Next, you should have the condition of front suspension bushings and steering checked by a C-3 Corvette specialist - NOT the auto shop down the street.
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Without a doubt, get rid of the Polyglas GT's. If you plan on driving the car, a good set of modern radials, like BF Goodrich TA's, is the way to go. The original tires on the car were F70 x 15 bias ply's, and the modern equivalent to the F70's is P215/70R15. There are reproductions of the original F70 bias ply tires available, but they're really best for show cars and "trailer queens", and not for cars that are driven regularly.
Once you've replaced the tires, I would find a shop familiar with the Corvette suspension, and have a good, 4 wheel alignment done. Making sure the Corvette's independent rear suspension is properly aligned, is as important as the condition and alignment of the front end. Let us know where you are in Florida, as there are a number of Corvette shops in Florida, and a number of members here live in Florida, so I'm sure someone can recommend a good shop to take your Corvette too. Welcome to the Forum! |
Originally Posted by gbvette62
(Post 1597574437)
Without a doubt, get rid of the Polyglas GT's. If you plan on driving the car, a good set of modern radials, like BF Goodrich TA's, is the way to go. The original tires on the car were F70 x 15 bias ply's, and the modern equivalent to the F70's is P215/70R15. There are reproductions of the original F70 bias ply tires available, but they're really best for show cars and "trailer queens", and not for cars that are driven regularly.
Once you've replaced the tires, I would find a shop familiar with the Corvette suspension, and have a good, 4 wheel alignment done. Making sure the Corvette's independent rear suspension is properly aligned, is as important as the condition and alignment of the front end. Let us know where you are in Florida, as there are a number of Corvette shops in Florida, and a number of members here live in Florida, so I'm sure someone can recommend a good shop to take your Corvette too. Welcome to the Forum! |
Unofficial quick-check pictures below...…………………….
https://cimg2.ibsrv.net/gimg/www.cor...659f1338bb.jpg BEFORE DIY temporary camber adjustment https://cimg9.ibsrv.net/gimg/www.cor...a1068a9127.jpg AFTER DIY camber adjustment...notice there is NO gap between tire and level now. |
Also, worn rear end suspension bits can also cause wandering at speed that feels like it's the front end - voice of experience here. Check out the rear as well.
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Pictures are always good for me, Thanks Doorgunner
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Originally Posted by Metalhead140
(Post 1597580277)
Also, worn rear end suspension bits can also cause wandering at speed that feels like it's the front end - voice of experience here. Check out the rear as well.
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Do you have play in the steering going straight? If you have to move the steering wheel a few inches you are not steering the car you are aiming it, I agree a complete front suspension check is in order. The car should not wander under 120mph
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Originally Posted by gbvette62
(Post 1597574437)
Without a doubt, get rid of the Polyglas GT's. If you plan on driving the car, a good set of modern radials, like BF Goodrich TA's, is the way to go.
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Originally Posted by KevinL46
(Post 1597647988)
"a wee bit" over over the posted 70mph speed limit, purely for testing purposes :D
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Hell, if I could, I'd be doing daily tests. Like... leave a work meeting early because I need to run the unit tests on the corvette daily...
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Had a similar issue definetly check rear trailing arm bushings. Mine where so hard they shattered when moving the arm while on lift.
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