Discussion
Ok - it's not going away. Changed tyres and now I've gone from the smoothest most lovely poised set-up ever to a mad tramlining beast whose inclinations to jump at oncoming traffic I can just about overcome. The wiggle on crossing white lines is incredible for such a thin layer of paint, but you can feel both grip changes on and off the line.
Is the price you pay for stickier tyres feeling the true horror of what the road is really doing?
I've checked tyre pressures (18-19 cold all round), and alignment (seems straight, and was tested in garage). The springs are aching to be played with, but I'm not sure if that is the next answer. Any thoughts?
Is the price you pay for stickier tyres feeling the true horror of what the road is really doing?
I've checked tyre pressures (18-19 cold all round), and alignment (seems straight, and was tested in garage). The springs are aching to be played with, but I'm not sure if that is the next answer. Any thoughts?
7db said:
Changed tyres and now I've gone from the smoothest most lovely poised set-up ever to a mad tramlining beast whose inclinations to jump at oncoming traffic I can just about overcome. The wiggle on crossing white lines is incredible for such a thin layer of paint, but you can feel both grip changes on and off the line.
Is the price you pay for stickier tyres feeling the true horror of what the road is really doing?
Strange, I had exactly the opposite. When I first bought my car both front tyres were barely legal and it tramlined like a bugger. As soon as I stuck a fresh set of Avons on it, all was well.Is the price you pay for stickier tyres feeling the true horror of what the road is really doing?
Presuming here you changed brand/type of tyre.
I've had cars that worked well on one brand (Goodyear F1s) but suffered terribly from tramlining on another perfectly acceptable brand (Michelin Pilots). In fact it went far beyond that- behaviour on the Pilots was unpredictable in the wet. It was suggested to me that it could be a faulty batch of tyres once the geometry had been checked. I didn't take the risk and switched back to Goodyears.
I've had cars that worked well on one brand (Goodyear F1s) but suffered terribly from tramlining on another perfectly acceptable brand (Michelin Pilots). In fact it went far beyond that- behaviour on the Pilots was unpredictable in the wet. It was suggested to me that it could be a faulty batch of tyres once the geometry had been checked. I didn't take the risk and switched back to Goodyears.
7db said:
Ok - it's not going away. Changed tyres and now I've gone from the smoothest most lovely poised set-up ever to a mad tramlining beast whose inclinations to jump at oncoming traffic I can just about overcome. The wiggle on crossing white lines is incredible for such a thin layer of paint, but you can feel both grip changes on and off the line.
Is the price you pay for stickier tyres feeling the true horror of what the road is really doing?
I've checked tyre pressures (18-19 cold all round), and alignment (seems straight, and was tested in garage). The springs are aching to be played with, but I'm not sure if that is the next answer. Any thoughts?
No solutions I am afraid - can only say that the CSR I drive (which I know has different suspension but has a similar track to your SV I would assume) does not suffer this issue. I'm running Avon R500s, with pressures of 24 / 23 psi front /rear. It tracks very straight and true, as your's used to.Is the price you pay for stickier tyres feeling the true horror of what the road is really doing?
I've checked tyre pressures (18-19 cold all round), and alignment (seems straight, and was tested in garage). The springs are aching to be played with, but I'm not sure if that is the next answer. Any thoughts?
Are your tyres stickier than the R500s?
I can only agree with Dave - it may be worth getting the alignment re-checked somewhere else on a full 4-wheel alignment jig. Might even be worth getting the car corner weighted.
Kind regards
Steve
Do your new tyres have a different tread pattern to the old? My Mondeo was following the camber of the road a bit much so took it to Tony Bones at WIM for a check up. Geometry was near on perfect so he swapped front and rear tyres (different makes and patterns).
Problem solved.
Swapped 'em back eventually and problem returned.
Tony Bones explained how certain tread patterns could cause tramlining etc (on top of things like presssure, compound, wear etc etc etc). Its all a bit of a black art.
Problem solved.
Swapped 'em back eventually and problem returned.
Tony Bones explained how certain tread patterns could cause tramlining etc (on top of things like presssure, compound, wear etc etc etc). Its all a bit of a black art.
That's the classic problem of ACB10s, but unusual to show up in a change from 539s to 048s. Have you got anyone handy with spare wheels on (say) CR500s to see what happens?
I also had a problem where putting ACB10s on showed up a front suspension issue. That was a worn rh lower swivel. It was fine on CR500s but on ACBs, the car shot right on acceleration.
Are you running the front slightly toe'd out? That's a common (hack) cure used on caterhams to counter understeer (no slight intended). That might be fine on one tyre/tread pattern, but be horrid on another?
Has the ride height (or rake) changed at all with the new tyres and changed the bump-steer characteristics?
Do you know what the front geo is set to? Could the change of tyres coincide with another change (pot-hole screwing up the tracking)?
(clutching at straws) Bert
I also had a problem where putting ACB10s on showed up a front suspension issue. That was a worn rh lower swivel. It was fine on CR500s but on ACBs, the car shot right on acceleration.
Are you running the front slightly toe'd out? That's a common (hack) cure used on caterhams to counter understeer (no slight intended). That might be fine on one tyre/tread pattern, but be horrid on another?
Has the ride height (or rake) changed at all with the new tyres and changed the bump-steer characteristics?
Do you know what the front geo is set to? Could the change of tyres coincide with another change (pot-hole screwing up the tracking)?
(clutching at straws) Bert
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