LBMEFM
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| posted on 6/9/09 at 03:14 PM |
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Handling
I am getting used to driving my MK Indy-Blade, performance brill, but the handling is still unsteady. I have now lowered the ride to its lowest, the
front and rear wheels have been tracked parallel, got 1 degree camber on front and back, tyre pressures 23 front 26 rear with 5 clicks on the dampers.
I have tried several other settings but its still wrong, At high speed it drifts where it likes with very light steering and in tight corners the rear
wants to break away. I have done a lot of sprinting in the past and not a stranger to fast driving but this car is a bit of a worry. Any ideas?
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Davg
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| posted on 6/9/09 at 03:16 PM |
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Drop the tyre pressures to around 15- 16 & will notice an improvement.
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philw
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| posted on 6/9/09 at 03:20 PM |
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quote:
Originally posted by Davg
Drop the tyre pressures to around 15- 16 & will notice an improvement.
Depends on the tyres, but 23/26 iis too high
[Edited on [1252250537R0=033030p: by philw]
Must try harder
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Flamez
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| posted on 6/9/09 at 03:21 PM |
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Jack the back up several cm higher than front to distribute load to front.
Mine is set with 3 clicks allround and 18-20psi
my build mac1motorsports
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britishtrident
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| posted on 6/9/09 at 03:31 PM |
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Check your Toe-in front and rear --- you must have some toe-in on the rear and it is better to to have a little on the front. Toe in on
the rear is very effective reducing any tendency to snap oversteer. Toe-in on the front makes the car less jittery in a straight line.
Camber should be 0.5 to 1.5 degree negative try 0.5 on the front 1.5 on the rear
Soften the dampers off a couple clicks same goes for tyres you have light car the dampers and tyres need to be soft but I don't think this
is the main problem.
If that dosen't work you need to alter the roll couple distribution ie either by the spring rates ( make front harder or rear softer) or
add front anti-roll bar.
The other easy way to reduce oversteer is alter the tyre & rim sizes --- fit narrower fronts or wider rears your car will have a reward weight
bias so doing this makes a lot of sense. The preferred option would be make the fronts narrower.
[Edited on 6/9/09 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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Steve Hignett
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| posted on 6/9/09 at 04:04 PM |
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quote:
Originally posted by britishtrident
Check your Toe-in front and rear --- you must have some toe-in on the rear and it is better to to have a little on the front. Toe in on
the rear is very effective reducing any tendency to snap oversteer. Toe-in on the front makes the car less jittery in a straight line.
Camber should be 0.5 to 1.5 degree negative try 0.5 on the front 1.5 on the rear
Soften the dampers off a couple clicks same goes for tyres you have light car the dampers and tyres need to be soft but I don't think this
is the main problem.
If that dosen't work you need to alter the roll couple distribution ie either by the spring rates ( make front harder or rear softer) or
add front anti-roll bar.
The other easy way to reduce oversteer is alter the tyre & rim sizes --- fit narrower fronts or wider rears your car will have a reward weight
bias so doing this makes a lot of sense. The preferred option would be make the fronts narrower.
[Edited on 6/9/09 by britishtrident]
As above, but what's your ride height front and rear?
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Stuart_B
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| posted on 6/9/09 at 04:24 PM |
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i have my trye pressure at 18 all round, and ride height is 3inch at the front from the sump and 6inch at the back.
black mk indy, 1.6pinto on cbr600 bike carb's.
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iank
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| posted on 6/9/09 at 07:26 PM |
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Worth checking procomp's posts on this thread about tyre pressures.
http://www.locostbuilders.co.uk/viewthread.php?tid=117679
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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