How to avoid 'stoppies'?

[samygrandao]

I'm having problem with an abarth 500 at 550pp tuning: i can't stop it to make stoppies. i tryied balast, change suspension setup, and makes no difference. what should i do?
I'm not a very good at tuning, but i tryied stuff that make some sense.

 

[lbpomg95]

Try increasing anti roll bars and natural frequency. They reduce body roll so should help.

 

[Lilium]

And with all the above, try to also not use race tyres.

 

[samygrandao]

Try increasing anti roll bars and natural frequency. They reduce body roll so should help.

It worked. Thx, man.
What is the principle behind of altering nat frequency?

 

[samygrandao]

And with all the above, try to also not use race tyres.

I wasn't. They are ss tyres.

 

[Lilium]

It worked. Thx, man.
What is the principle behind of altering nat frequency?

It stiffens your springs, which will make them, and thus the car more resistant to body roll.
Basically, you need more force to push them down, so when you accelerate, the rear is fighting more the force that pushes it down.

Another good tip is to also make sure your dampers compression on the rear are stiff, to also add more resistance to this force, but it will make the rear over bumps a bit of a big pain.

Regarding the tyres, the grippier they are, the stronger the wheelie is, aha.

 

[samygrandao]

It stiffens your springs, which will make them, and thus the car more resistant to body roll.
Basically, you need more force to push them down, so when you accelerate, the rear is fighting more the force that pushes it down.

Another good tip is to also make sure your dampers compression on the rear are stiff, to also add more resistance to this force, but it will make the rear over bumps a bit of a big pain.

Regarding the tyres, the grippier they are, the stronger the wheelie is, aha.

Thx for the explanation. I thought changing the damping ratio would do that.
My 500 is now almost competitive.

 

[LateBrakR]

I'm having problem with an abarth 500 at 550pp tuning: i can't stop it to make stoppies. i tryied balast, change suspension setup, and makes no difference. what should i do?
I'm not a very good at tuning, but i tryied stuff that make some sense.

What do you mean by "stoppies"? Is the nose dipping? That needs front compression and/or spring natural frequency. Or you can soften the rears. Rear rebound can help as well.

 

[maxeyshikari]

And with all the above, try to also not use race tyres.

I'm very new to trying to figure out tunes myself, why would you not use racing tires (apart from pp limits)?

 

[Lilium]

@LateBrakR A Stoppie is the reverse of a wheelie. Its lifting the rear wheels when braking.

Which in turn, makes me realize. I was thinking backwards, towards wheelies.

@samygrandao Increase the stiffness on the front compression dampers, and the rear rebound/extension dampers. Allied to a stiff Spring rate (Nat. Frequency), this will make the car fight back the compression of the front wheels, and the lift of the rear when braking.
Just don't hit curbs though. the car will launch itself aha.

@maxeyshikari when you have tunes in cars like the old 500 Abarth with a swapped engine, or the Swapped VW Beetle, they can be prone to do wheelies when accelerating. And the grippier the tyre, the more this is accentuated. same thing with per example, lifting the inner wheels when doing corners or slaloms with loose, soft unstable cars. The tyre does not break traction, so the force pulls the car over the tyres, so to speak.

Don't worry about using Race tyres on 99% of the cars.
But if you want to experience this, try per example a swapped VW Sambabus with max ride height, the softest on all suspension settings, and soft race tyres. Just drive around and do sharp agressive inputs.