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Old 07-13-2005, 05:08 AM   #2896
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moving the wheels back will decrease grip, but make it more stable....moving the wheels foward would of increased rear grip, but would of been slightly more aggresive through the corners (well thats what ive found when shortening the wheel base)
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Old 07-13-2005, 05:15 AM   #2897
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Wheelbase:

front: if you put the spacers behind the arms -> less steering, car carries better cornerspeed
spacers in front of arms -> more steering, less cornerspeed

rear: shims behind arms -> less steering (more stability in the rear)
shims in front of arms -> more steering, sometimes you get the feeling, that the rear end (actually I don'T know how to say..) "floats", means you can never say, if the rear end will break out or not..

Wheelbase overall:

long -> more stability, especially on the straight, but the car reacts slower
short -> less stability, especially at high speed, Car can get a little nervous, but reacts faster (often prefered)


roll center:

front: car doesn't "roll" that far, less steering, nearly same effect as sway bar

rear: " " " " ", more steering , nearly same effect as swaybar


Hope you can understand, what I've written :-)

Martin.
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Old 07-13-2005, 05:17 AM   #2898
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@ Matt Howard:

Whats the weight of your BD, ready to race? 1550g or over? I'd say so.
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Old 07-13-2005, 05:21 AM   #2899
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Martin and Raving-Monkey,

Thank you very much for the fast answer!
I'm not sure of the right definition of grip in English, but I meant that the rear end was a bit loose...on my SD when I was moving the rear arms forward it had the opposite effect (it was adding more weight on the rear wheels when I was doing so). With a longer wheel base the car does feel more stable and doesn't feel so loose but it's just slower
I will try an in-between setting.

Martin, I'm not sure I understood everything about roll center and arms mounts shims

Thanks again.

Gilles
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Old 07-13-2005, 05:25 AM   #2900
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sometimes you run too soft springs in the rear, then arm spacing has the opposit effect ... try Yokomo orange in front end green in the rear
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Old 07-13-2005, 06:30 AM   #2901
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Quote:
Originally Posted by Matt Howard
Here's a pic of my "carpet" BD with a custom made 3mm chassis and topdeck. Super stiff.
Looks good to me!

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@ Matt Howard:

Whats the weight of your BD, ready to race? 1550g or over? I'd say so.
I'm not Matt Howard but the car we have setup just like this is right at the foam tire rule of 51oz which is about 1450g. But that again is on foam tires. Hopefully that helps.
Jim
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Old 07-13-2005, 06:31 AM   #2902
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Quote:
Originally Posted by Martin Hofer
@ Matt Howard:

Whats the weight of your BD, ready to race? 1550g or over? I'd say so.
I haven't weighed my car yet with the new thicker chassis but it was considerably under weight with the stock chassis. I forget how much under it was but I know I had to add 6 nickels, how ever much they weigh
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Old 07-13-2005, 06:33 AM   #2903
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do foams weight less than rubber tires?
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Old 07-13-2005, 06:37 AM   #2904
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Yes, and the weight difference is not consistent from one person to another as tire diameter is personal preference, making it hard to give an exact weight.
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Old 07-13-2005, 06:44 AM   #2905
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I've also got the Ti racing "worlds" aluminum CVD's on the car and they weigh almost nothing
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Old 07-13-2005, 06:51 AM   #2906
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Quote:
Originally Posted by Matt Howard
I've also got the Ti racing "worlds" aluminum CVD's on the car and they weigh almost nothing
Yeah, those things are unbelievable. I run those on my Schu------, Can't say it in the wrong thread
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Old 07-13-2005, 07:03 AM   #2907
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Quote:
Originally Posted by Martin Hofer
@ Matt Howard:

Whats the weight of your BD, ready to race? 1550g or over? I'd say so.
With GP3700s mine is just under 1500 grams with bodyshell.
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Old 07-13-2005, 07:08 AM   #2908
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yes this is what I know too, but if you run such an heavy chassi, the car hast to be over 1500 with rubbers
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Old 07-13-2005, 07:18 AM   #2909
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It all comes down to cost/benefit anaysis.
Sometimes you have to give something up in order to get something in return.
On carpet with foams a little weight is worth having the suspension work properly and give you the most cornerspeed possible, IMO.
And I can tell you Matt's car is NOT heavy. It is nowhere near the weight of a racing equipped CGM.
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Old 07-13-2005, 07:19 AM   #2910
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Quote:
Originally Posted by Martin Hofer
yes this is what I know too, but if you run such an heavy chassi, the car hast to be over 1500 with rubbers
This chassis is specifically for foam tire racing where you need a really stiff chassis. For rubber tire racing I will probably just get another BD instead of switching chassis' back and forth
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