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Old 05-09-2006, 03:05 PM   #5116
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My friend , the funniest things on r/c tech are these that you write!!!
For some driving styles changing the position of the body or changing to another body has NO effect , instead changing the roll center may cause 0.5 sec down the best lap time , in the track , ( like i did) . of course maybe at 415 the "things" and the changes effect the car in an opposite way!!
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Old 05-09-2006, 03:08 PM   #5117
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I do like the double decker bus thing though
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Old 05-09-2006, 03:09 PM   #5118
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Fab is correct, think of the roll centre pivoting around the centre of gravity, which is technically what happens. if you raise the roll centre then the distance between the RC and CG will be smaller, therefore there will be less roll. its hard to explain, please anyone feel free to explain it better? Fab(TRF415 boy)?
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Old 05-09-2006, 03:15 PM   #5119
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also, when you are in a lower grip situation you lower the roll centre, because this induces more roll and generates more grip. on high grip carpet you higher the roll centre to create less roll so that you do not have grip roll issues, or too much grip that bogs the car down in the corners.
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Old 05-09-2006, 03:20 PM   #5120
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Quote:
Originally Posted by Scott Taylor
lol ok but why is it several people on here have said to you that its the other way around but yet you still seem to believe your right


yes it is a very small change but it is how it works.....

heres another example you get a pendulum (spelling?) and put the weight near the bottom and it wont lean as much as if the weight is higher up.....
Several people, but who are they ? What do they actually know about the physics of racing ? What do you know about a car's setup ? Now mark my words once and for all, when you move the blocks up and down, the affect of it on the centre of gravity is near zero. Want some numbers ? Ok, I have a CAD model that tells me, that when you move them up 1mm (the blocks for all the wishbones) you're raising the CoG by 0.007 mm. WOW.

Now my same CAD model, tells me that with the suspension from the Yokomo SD (agreed not the BD but similar geometry), raising the hinge pins by 1mm raises the roll centre by something of the order of 0.2 to 0.4 mm. Surely you will see the difference now, won't you ?

If you won't believe me, then maybe you can ask Martin Crysp who is on this forum (and visits the 415 thread sometimes), surely you'll believe the guy who wrote the XXX setup guide.
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Old 05-09-2006, 03:22 PM   #5121
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Quote:
Originally Posted by Zacharopoulos
My friend , the funniest things on r/c tech are these that you write!!!
For some driving styles changing the position of the body or changing to another body has NO effect , instead changing the roll center may cause 0.5 sec down the best lap time , in the track , ( like i did) . of course maybe at 415 the "things" and the changes effect the car in an opposite way!!
Oxi when did i say the roll centre had no effect ? read me again and you'll see i said centre of gravity. Besides you should try swapping bodyshells, if you can't see any effect, then i suggest swapping fingers.
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Old 05-09-2006, 03:25 PM   #5122
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.

Last edited by understeer; 07-19-2010 at 11:29 PM.
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Old 05-09-2006, 03:27 PM   #5123
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Quote:
Originally Posted by understeer
So if I put spacers under the mounts as the kit instructions say, then the car is set up for more roll therefore it is set up for generating more grip...right?
NO it will stay flatter in the corners, means it'll react quicker. Doesn't mean it'll be slower though.
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Old 05-09-2006, 03:28 PM   #5124
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no, the spacers under the suspension mounts raise the roll centre so that induces less roll, and less grip theoretically. hope that helps.
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Last edited by housey; 05-10-2006 at 10:46 AM.
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Old 05-09-2006, 03:44 PM   #5125
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Quote from the man himself, Chris Grainger

"No shims under suspension mounts lowers the roll centre..Shims [any amount] under the mounts raises roll centre... Raise top link inner position lowers roll centre...lower the top link inner position raises roll centre

Lower roll centre = more roll
higher roll centre = less roll
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Old 05-09-2006, 03:57 PM   #5126
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thankyou for tha, do we all agree now??
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Old 05-09-2006, 04:00 PM   #5127
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Quote:
Originally Posted by housey
no the spacers under the suspension mounts raise the roll centre so that induces less roll, and less grip theoretically. hope that helps.

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Old 05-09-2006, 04:01 PM   #5128
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sweet!
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Old 05-09-2006, 04:02 PM   #5129
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Quote:
Originally Posted by Scho
Chris its the other way round, more shims under the wishbone blocks raises the Roll Centre, giving the ar less roll. A lower roll centre makes the car have more roll.

Now i hope that helps
Ha ha I caught you talking bol...s in my back, you don't need to repeat what he said
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Old 05-09-2006, 04:04 PM   #5130
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Quote:
Originally Posted by TRF415boy
Ha ha I caught you talking bol...s in my back, you don't need to repeat what he said

You little Bitch
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