ashg
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| posted on 4/5/11 at 01:53 PM |
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Haynes Front Suspension Improvements
After fitting my new engine i now have a fair bit more power to find the limits of the chassis (something i couldn't ever do with a 1.6 pinto).
The suspension has been setup and the car drives very well through all manner of situations from high speed straights to long sweeping bends but there
seems to be a little issue with tight cornering when pushing on a bit especially hair pin type bends.
I have noticed that in tight corners my front wheel that is on the outside of the corner (longer distance to travel) will squeel under load in the
corner.
Now i spoke to martin keenan about this at stoneleigh and he admitted that the front end could be improved, since he designed the roadster back in
2006-7 he has got a lot better at using his cad packages and admitted that if he were to design the car again it would be with custom uprights at the
front to get the geometry correct.
the thing that really spurred me on to investigate this further was that i spoke to tilly at stoneleigh and his roadster (blade engined) also does the
same thing.
So is anyone up for having a go at investigating this further and seeing if we can come up with a solution to improve the setup?
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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jacko
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| posted on 4/5/11 at 03:28 PM |
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Saying as Martin know the chassis how about asking him ?
Just a thought
Jacko
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Bare
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| posted on 4/5/11 at 04:58 PM |
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the weight of that engine unit 'might' have something to do with it...weight transfer pushing hard on the outer tire?.
New upright seems a bit drastic retrofit and in my unenlightened opinion would ultimately involve new pickup points And new a arms..perhaps even
ones where the shock cl isn't starting halfway out on the lower arm?
Big Can 'o worms
Frankly I'm amazed the suspension works as well as it does :-).. leave it?
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britishtrident
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| posted on 4/5/11 at 05:46 PM |
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Sounds like the car is under steering ---- The squeal is generated because outside front tyre is being asked to work beyond the slip angle at which
it generates peak lateral grip.
Usually the cure for understeer is to stiffen the rear roll stiffness or soften the front roll stiffness but you need to do basic check first
toe-in, camber, corner weights.
[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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ashg
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| posted on 4/5/11 at 06:17 PM |
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its not a weight issue as i swapped from pinto to saab its only 30kg difference all up. plus tillys car has a bike engine and does it too. the car
has been aligned/setup so its not that
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ashg
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| posted on 4/5/11 at 06:19 PM |
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quote:
Originally posted by jacko
Saying as Martin know the chassis how about asking him ?
Just a thought
Jacko
well i did hover around the subject at the show but he is a bit busy with the beamR at the moment so could be a long wait.
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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baz-R
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| posted on 10/5/11 at 08:59 AM |
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could be an issue with a thing called "accerman angle" (could be spelled wrong)
its a steering geomertry thing where the front wheels will not be on correct track to radius of wheel paths in a turn in all steering postions. usualy
with a std type setup you only have one turn angle where the wheels point directly to the correct path.
only thing i can think of is its like a london taxi on full lock and the inner wheels angle is too tight for the path of car but it does allow it to
do the tightest of u turns
thats why modern cars have all that multi link stuff now
would be intersted if fitting a central type mushroom without offset helps as it would shorten the effective length of the kingpin to track rod end
changing your effective accerman angles or moving your rack postion or lenth between track rod inner joints. would all effect it
complicated stuff and it changes when the suspension moves up and down too
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