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Author: Subject: Scrub radius on a Fury
philw

posted on 25/2/10 at 05:10 PM Reply With Quote
Scrub radius on a Fury

Does anyone know what it should be?





Must try harder

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clairetoo

posted on 25/2/10 at 05:13 PM Reply With Quote
Dont know what it should be - but I do know it's a lot !
Thats mainly why I lengthened my wishbones and fitted deeper (ET 35 as opposed to ET10) wheels - the improvement was dramatic , to say the least .





Its cuz I is blond , innit

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philw

posted on 25/2/10 at 05:20 PM Reply With Quote
Cheers for that, i'm having handling issues with my Stylus which is the RT version, 40mm wider than a normal Stylus, i'm slowly working through it and wanted to check the scrub radius, i'm running et42 wheels as opposed to et12-15, i will have to get in the garage at the weekend and check to see if it's pos or neg.





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JekRankin

posted on 25/2/10 at 06:18 PM Reply With Quote
Hi Phil,

If you ask on the Sylva Chat google group I think someone should be able tell you the value. I believe some of the guys on there have measured up the Fury suspension geometry to have a play about with settings in suspension software or to build a CAD model of their car.


Jek

[Edited on 25/2/10 by JekRankin]

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britishtrident

posted on 25/2/10 at 08:25 PM Reply With Quote
Scrub radius while not something desirable isn't a major problem especially on a light car.





[I] “ What use our work, Bennet, if we cannot care for those we love? .”
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[/I]

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procomp

posted on 25/2/10 at 10:54 PM Reply With Quote
Hi

Agree with the above statement. There's plenty of racers using 1" spacers and 0 offset wheels with no big issues. The rest of the geometry and bump steer issues are more important to get corrected first.

Cheers Matt






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Antnicuk

posted on 28/2/10 at 04:36 PM Reply With Quote
my cousin tells me my stylus is skittish on bumpy roads especially when breaking due to my scrub but cannot tell me why.

Can someone give a basic explanation and how it effects the cars handling.

Phil
We will have to swap cars sometime and have compare.





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britishtrident

posted on 28/2/10 at 07:30 PM Reply With Quote
Main effect of scrub radius is the extra leverage effect causes too much kick back through the steering on rough surfaces, and the effect of an unbalanced wheel is magnified.

It also loads up the steering when cornering hard but improves improves self centering.

The original Ford Escort rally cars had lots of scrub radius but still got the job done on both forrest and tarmac stages.





[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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Antnicuk

posted on 28/2/10 at 08:15 PM Reply With Quote
that sounds like my problem!





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MikeRJ

posted on 28/2/10 at 10:06 PM Reply With Quote
quote:
Originally posted by Antnicuk
my cousin tells me my stylus is skittish on bumpy roads especially when breaking due to my scrub but cannot tell me why.


Are you sure this isn't bump steer?

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philw

posted on 28/2/10 at 10:18 PM Reply With Quote
Tony, mine not skittish it just has no feel through the front end, i really need to re-make my lower arms as i have neg castor on one side and pos on the other.





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Antnicuk

posted on 28/2/10 at 10:35 PM Reply With Quote
quote:
Originally posted by philw
Tony, mine not skittish it just has no feel through the front end, i really need to re-make my lower arms as i have neg castor on one side and pos on the other.


i dont think so, i spent half a day trying to establish if i had bump steer and from what i could tell i dont have any. i took the springs out and used straight edges and plumb lines etc but couldnt find any bump steer





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