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Old 08-07-2002, 01:15 PM   #3361
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LouisB :: I thought the opposite about lowering the hinge pin.
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Old 08-07-2002, 01:38 PM   #3362
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louis B
LIST THEM PLEASE
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Old 08-07-2002, 02:18 PM   #3363
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Default Roll center

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I've taken 3mm off the front and rear pivot blocks to lower the roll-center. I haven't driven the car yet but what handling differences should I expect?
When you do this you have actually raised the roll center, but Losi calls Low Roll Center when you lower the bottom hingepins-which is wrong.
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Old 08-07-2002, 02:19 PM   #3364
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shrekair

Which ones do you want? the carpet+rubber is with T27s (treaded)
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Old 08-07-2002, 02:25 PM   #3365
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OK now I think about it, it does raise the center of rotation
but still, what will it do to my car (or will I have to wait until my sunday race)
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Old 08-07-2002, 02:30 PM   #3366
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The lower the plates are to the chassis the more roll that end of the car will have.
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Old 08-07-2002, 02:33 PM   #3367
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just list all three setups
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Old 08-07-2002, 02:35 PM   #3368
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moving the hingepins closer to the chassis lowers roll center. in general lower roll center is more steering off the corner, higher roll center is more steering into the corner.
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Old 08-07-2002, 02:46 PM   #3369
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isn't it the other way around?
by rising the hinge pins away from the chassis you can still have the same ride height but the suspension not as compressed as before so the suspension works better?
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Old 08-07-2002, 02:51 PM   #3370
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Default Carpet + Foam

Andy Moore's foam on carpet set-up

Open track

Front
toe in: 0.5 degrees
Ride height: 4.5mm
camber: -1 left -0.5 right
caster: 4 degrees
roll bar: None
droop height: 3
arm spacing: forward
front differential
pivot blocks: lowered 3mm
camber link: pos. 3
washers under spindle: 1.5mm

Front Shocks
oil: 70wt
piston: 57 (black)
spring: black
length: 61mm
pos. : mount position 3

Rear
toe in: 2 deg.
ride height; 5mm
camber: -1 right -1.5 left
roll bar: none
droop height: 5
arm spacing: back
pivot blocks: lowered 3mm
inner camber link: pos. 2
outside camber link: pos. B w/ 1mm washer

Rear Shocks
oil: 50wt
piston: 56 (red)
spring: black
length: 65.8mm
mounting position : pos. 3
wishbone pos: outside

Notes:
Front tyre: TRC Plaid
Rear tyre: TRC Purple
front additive: up to join
Rear additive: full
Tyre diameter: 59mm
Battery: forward
Motor: P94 12x2
pinion: 30
Spur: 108
Bodyshell: P.form Stratus
Bodyshell height: as low as possible

That took a long time
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Old 08-07-2002, 02:54 PM   #3371
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works better? raising the pins raises roll center it doesnt affect compression in that way
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Old 08-07-2002, 03:24 PM   #3372
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Quote:
Originally posted by LouisB
I've taken 3mm off the front and rear pivot blocks to lower the roll-center. I haven't driven the car yet but what handling differences should I expect?

Also, if anyone is interested, a UK mag has printed up the set-ups of three of the Losi team drivers. One is foam on carpet, one is rubber on carpet and the other is rubber on asphalt. If anyone would like me to put them up here just ask
They are all race winning set-ups
Hey Louis, the lower the hinge pins are to the chassis the more roll that end of the car will have. As you go up(pivot blocks), roll is decreased. It's just like camber links, the higher the inside pivot point of a camber link(usaually on the shock tower) will give that end more roll-visaversa for lower camber links.

Louis, could you please post the rubber on asphalt setup. I'm dying to see something new. Thanks-Ralph
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Old 08-07-2002, 03:25 PM   #3373
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Default rubber on asphalt

Westley Payne's set-up

open track

Front
toe out: 0.5 degrees
Ride height: 5mm
camber: -1 degree
caster: 4 degrees
roll bar: None
droop height: 3
arm spacing: forward
one way differential
pivot blocks: lowered 3mm
camber link: pos. 3

Front Shocks
oil: 50wt
piston: 57 (black)
spring: blue
length: 61mm
pos. : mount position 3

Rear
toe in: 2 deg.
ride height; 5.5mm
camber: -0.5 degrees
roll bar: none
droop height: 5
arm spacing: back
pivot blocks: lowered 3mm
inner camber link: pos. 2
outside camber link: pos. B

Rear Shocks
oil: 50wt
piston: 56 (red)
spring: green
length: 65.8mm
mounting position : pos. 3
wishbone pos: inside

Notes:

Tyres: Take Off CS22
Insert: Pit Shimizu Medium
Battery: forward
Motor: P94 12x2
pinion: 27
Spur: 88
Bodyshell: Protoform Vauxhall Vectra
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Old 08-07-2002, 03:26 PM   #3374
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Man that was quick!-Thanks
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Old 08-07-2002, 03:34 PM   #3375
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I wonder what degree the track was for that setup(Westly Payne's rubber on asphalt)?
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