XRAY - Model racing cars

Hi can someone explain to me the affect of putting the upper camber in one of the 3 positions

Hag bergs answer to similar question
Raise upper link on the outside: the roll center is raised.
Raise upper link on the inside: the roll center is lowered.
Raise the link on both points: the roll center is lowered, albeit slightly.

Longer upper link: the roll center is lowered. The roll center itself will go lower throughout the roll. Whereas, when the upper link is shortened, the height of the roll center has less of a change.

Roll center affects and is affected by many other areas of the car such as camber, shocks, shock springs, camber gain etc. It is therefore important to understand that this change in set-up cannot be considered as an effect of its own.

The rule of thumb:

Higher front roll center: Decreases chassis roll at the front end of the car. It will make the car under steer off-power. The car will have better on-power steering as less weight is transferred to the rear wheels. Will make the front tires overheat less. The car will have a quicker initial response.

Lower front roll center: Increases chassis roll at the front end of the car. It will make the car have less on-power steering. The turn-in will be better (corner entry steering) off power. The car will absorb bumps better. The car will have a slower initial response.

Higher rear roll center: Decreases chassis roll at the rear end of the car. On-power steering will be decreased. Off-power steering (turn-in) will be increased as more weight will stay on the front wheels at corner entry.

Lower rear roll center: Increases the chassis roll at the rear end of the car. The on-power steering will be increased. The corner entry steering will however be decreased.

Thanks for the reply that's really helpful

"Higher front roll center: Decreases chassis roll at the front end of the car....The car will have better on-power steering as less weight is transferred to the rear wheels....."

Hi,

I always thought that higher roll center increases chassis roll at that point and therefore increases traction.

Also, I thought that when you need more on power steering, you need more weight transfer to the rear wheels.

Could you please explain to me?

I'm no expert but the way I see it, if you were to wheelie the weight is over the rear wheels and no steering.

You have to remember that each change will affect the opposite end in a different way at a different part of the track

Hi.can someone please explain how moving the lower arms up or down efects the car and when would u move them up or down.i moved all the blocks to 1 mm down to see what it does but the car was to agressive.never see setups with them moved.thanks

You do see it but not the whole arm just for dive or squat (I've never achieved a set up I'm happy with by doing it so always stuck level middle!!!)