johnnybizzle1986
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| posted on 2/5/14 at 01:13 PM |
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Dodgy handling/ poor setup
Hi guys,
Took my CBR1000 roadster out at the weekend for the first time this year, and the handling wasn't great. Just had its first MOT.
Got the car running sweet last year, but after a few track day and advice from others I have tweeked about with a few things, but now on the road it
just not right.
Here goes ... straight line speed 60mph plus the car is constanly wandering so correcting it, but the steering wheel seems to have abit of play before
the car reacts, just a bit vague, there is no loose suspension parts, im guessing too much toe in?
any advice
Regards Jon
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Smoking Frog
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| posted on 2/5/14 at 01:37 PM |
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No expert but would also say get the toe checked. it sounds to me like you have toe out.
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19sac65
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| posted on 2/5/14 at 03:30 PM |
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Yep
Racers love loads of toe out , gives better turn in
at the expense of being vague in a straight line
I think mine had been set up for track as both front and rears were toed out loads
It was horrible on the road
Set it
with a little toe in and its much better
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Dingz
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| posted on 2/5/14 at 04:33 PM |
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What tyre pressures are you running?
Phoned the local ramblers club today, but the bloke who answered just
went on and on.
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Ivan
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| posted on 2/5/14 at 05:06 PM |
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Have you checked bump steer?
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britishtrident
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| posted on 2/5/14 at 05:52 PM |
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Tyre pressures first then, check dampers aren't too hard, then toe settings, toe-out at front is just unnerving, toe-out at the rear can be
lethal.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Sam_68
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| posted on 2/5/14 at 06:14 PM |
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quote:
Originally posted by johnnybizzle1986
Got the car running sweet last year ...I have tweeked about with a few things, but now on the road it just not right.
What, exactly, have you 'tweeked about' with?
Perhaps if you started with a bit of un-tweeking? 
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johnnybizzle1986
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| posted on 5/5/14 at 05:14 PM |
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Thanks for the responses, sorry for the late response, ive been at stoneleigh 
Running 22psi in toyo proxes on the road, dampers are stiff as, front wheels are toe in, front end lowered 12mm, castor is (by eye) pretty neautral
Im going to try, winding back the shocks first, then try abit less toe in, i think there is too much, what should it be?
Regards jon
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Sam_68
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| posted on 5/5/14 at 05:42 PM |
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quote:
Originally posted by johnnybizzle1986...front end lowered 12mm, castor is (by eye) pretty neutral
Although 12mm isn't much, remember that putting a nose-down rake on the car effectively reduces castor, which will reduce self-centring on the
steering. As Ivan suggests, lowering the front may have taken suspension movement into a range where bump steer has started to become significant, so
worth checking that, too.
Try it with just a touch of toe in (say 1.0mm per side), if you think you have too much, though as others have said 'constant wandering'
sounds more like what you'd expect from toe out.
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britishtrident
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| posted on 5/5/14 at 06:05 PM |
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quote:
Originally posted by johnnybizzle1986
Thanks for the responses, sorry for the late response, ive been at stoneleigh
Running 22psi in toyo proxes on the road, dampers are stiff as, front wheels are toe in, front end lowered 12mm, castor is (by eye) pretty neautral
Im going to try, winding back the shocks first, then try abit less toe in, i think there is too much, what should it be?
Regards jon
The shock absorbers should be set at the soft end of the range, if you set the dampers hard the suspension becomes over damped which prevents the
wheels following the road surface. Running the dampers too hard is very good way to find yourself hitting the scenery in the blink of an eye.
Toe-in within reason won't make the car unstable but toe-out will.
[Edited on 5/5/14 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Sam_68
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| posted on 5/5/14 at 06:16 PM |
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quote:
Originally posted by britishtrident...if you set the dampers hard the suspension becomes over damped which prevents the wheels following
the road surface. Running the dampers too hard is very good way to find yourself hitting the scenery in the blink of an eye.
Shouldn't make the car 'wander' constantly, though: that sounds more geometric?
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40inches
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| posted on 5/5/14 at 08:57 PM |
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Try lowering the tyre pressures, I dropped mine from 20psi to 16psi, it really does make a difference
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