Bump-steering (Tram-lining) Cerb
Discussion
Do your cars bump-steer on very bad roads?
Mine has been handling great since I changed the springs and got the tracking done but last night I was going along a very bad road (very uneven surface at the LHS) and the car was bump-steering a lot.
I just slowed right down and managed ok, but there was no way I could have gone through it at any sort of speed.
Is this normal?
I don't want to go making adjustments trying to fix something that can't be fixed.
For what it's worth, the car has 16" Spiders, standard size tyres and has been set up at 160mm ground clearance.
Mine has been handling great since I changed the springs and got the tracking done but last night I was going along a very bad road (very uneven surface at the LHS) and the car was bump-steering a lot.
I just slowed right down and managed ok, but there was no way I could have gone through it at any sort of speed.
Is this normal?
I don't want to go making adjustments trying to fix something that can't be fixed.
For what it's worth, the car has 16" Spiders, standard size tyres and has been set up at 160mm ground clearance.
Tyre pressures are 22psi front and 24psi rear.
These are as per page 64 of the Owners Handbook of the car.
As for the toe-in, it is set for 15" (the settings we got said toe-in 10 to 20" so we set it right in the middle). This is the same front and back.
I had the car out today for a good old hoon of about 200 miles on main roads, back roads and twisties and it was perfect on nearly all the roads.
It's just the very bad road surfaces it seemed to do it on.
These are as per page 64 of the Owners Handbook of the car.
As for the toe-in, it is set for 15" (the settings we got said toe-in 10 to 20" so we set it right in the middle). This is the same front and back.
I had the car out today for a good old hoon of about 200 miles on main roads, back roads and twisties and it was perfect on nearly all the roads.
It's just the very bad road surfaces it seemed to do it on.
byker28i said:
Mine does this a little with 17" wheels, especially with the truck tramlines on the motorway etc. I was hoping his was down to standard shocks or the different front wheels to the Eagle F1 rears.
Dave - It was like that with the Gaz shocks on, so you can rule out the shccks causing it/ My new one does the same if I am on the inside (Lorry) lane on the Moroeway too. I think it must just be that the cars have pretty direct steering. On the othere extreme of 'no feel steering' I've has 2 front tyre blow outs on my Legend, and the only way I knew was because when the CD track stopped, I could hear the noise of the flat tyre!! I know what I would rather have.
Bump steering and tram lining are two different problems with different causes and cures. Bump steer means that the wheels steer as they move up and down in bump - it's caused by incorrect geometry of the steering rack installation. Tramlining means that longitudinal grooves in the road tend to pull the steering (or even the whole car) wideways and it's caused by suspension settings, wheel offset, tyre size/pressure etc.
GreenV8S said:
Bump steering and tram lining are two different problems with different causes and cures. Bump steer means that the wheels steer as they move up and down in bump - it's caused by incorrect geometry of the steering rack installation. Tramlining means that longitudinal grooves in the road tend to pull the steering (or even the whole car) wideways and it's caused by suspension settings, wheel offset, tyre size/pressure etc.
Hmmmmmmmmmmmmmmm
GreenV8S said:
Bump steering and tram lining are two different problems with different causes and cures. Bump steer means that the wheels steer as they move up and down in bump - it's caused by incorrect geometry of the steering rack installation. Tramlining means that longitudinal grooves in the road tend to pull the steering (or even the whole car) wideways and it's caused by suspension settings, wheel offset, tyre size/pressure etc.
From what you are saying I reckon I'm bump-steering.
jensena said:
byker28i said:
Mine does this a little with 17" wheels, especially with the truck tramlines on the motorway etc. I was hoping his was down to standard shocks or the different front wheels to the Eagle F1 rears.
Dave - It was like that with the Gaz shocks on, so you can rule out the shccks causing it/ My new one does the same if I am on the inside (Lorry) lane on the Moroeway too. I think it must just be that the cars have pretty direct steering. On the othere extreme of 'no feel steering' I've has 2 front tyre blow outs on my Legend, and the only way I knew was because when the CD track stopped, I could hear the noise of the flat tyre!! I know what I would rather have.
Ta - that's saved me a few pennies.
I don't mind it too much now as I've got used to it.Gassing Station | Cerbera | Top of Page | What's New | My Stuff