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Old 12-18-2010, 03:43 PM   #1
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Default How tires scrub setting on 1/8 car works? HELP

how are the tires scrub works on the 1/8 scale cars?

which setting give more scrub?
-more spacer on the dog-bone side or wheel side of the drive axle?

does more scrub on the front mean that the car will slow down more when making a turn around the hairpin and thus causes the rear end to 'kick out'??
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Old 12-21-2010, 05:52 PM   #2
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anyone help please
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Old 12-22-2010, 07:46 AM   #3
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Im pretty sure you'll get a million different answers and reasons........best thing to do is try it compare lap times and go from there
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Old 12-22-2010, 08:37 AM   #4
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Quote:
Originally Posted by lastsun View Post
which setting give more scrub?
-more spacer on the dog-bone side or wheel side of the drive axle?
Doesn't really work like that. There is one setting that will give the least scrub, anything to either side of that will give more scrub. What that setting is depends on the offset of the wheel.
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Old 12-22-2010, 09:13 AM   #5
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Are you talking about the scrub radius or just tire scrub?

The scrub radius can be adjusted with changing the offset on the wheelaxle.

As you can see in the picture the scrub radius is influenced by the wheeloffset and the location of the pivotpoints on the outer side of the wishbones. This picture is of a Mcpherson strut, for a double wishbone like we use in our modelcars the dotted line is drawn through the outer pivot points/pivot balls.



The distance between the two dotted lines is your scrub radius, so by moving your wheel more to the outside by increasing the amount of shims on the outside of the upright (or changing to +0.xx hexes on your touring car) you will increase the scrub radius.

It's pretty save to say more shims on the outside of the upright increases the amount the scrub radius.
On some cars you can also get different front uprights with a different kingpin angle to change the scrub radius.
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Old 12-22-2010, 09:51 AM   #6
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Simple english : help the car to turn rounder

Shims on the outside ( wheel rim side ) = more grub rate = less rounder turn = feel like pushing

0 shims on the outside, ie. shims on the axle or cvd side = less grub rate = more rounder turn = quicker turn

your front tires possibly also wear faster due to excessive scrubbing.
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Old 12-22-2010, 10:04 AM   #7
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With the "kick out" with rear end, it could be a few things. Setup up of rear suspension, camber of rear end, toe-in of rearend, Diff adjustment, oversteering problem, some examples.

Scubing of tires when useing foams. Much is if you use a truer. Camber and diameter you cut them at. Customized to a track you race at. They all are different.

Good luck with it!!!
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