Rear Hopping

Author
Discussion

kjw

Original Poster:

49 posts

237 months

Saturday 3rd June 2006
quotequote all
Ok all you mini racers. Having just fitted a rear antiroll bar on my car I now find that on tight corners the rear end hops. On fast corners the car handles well. Front damper are set at 35 and rears are set at 15. The front has 5 degrees of caster and 1.5 negative and 0.5 negative at the back. Any suggestions will be welcome.

GreenV8S

30,489 posts

291 months

Saturday 3rd June 2006
quotequote all
The handling will change suddenly when the inside wheel comes off the ground. In effect, you've lost all roll rate/damping and halved the bump rate and damping, maybe this is what causes it? Perhaps try stiffening the rear (to increase the bump stiffness in 'three wheel' mode) or stiffen the front to increase rol stiffness?

guru_1071

2,768 posts

241 months

Saturday 3rd June 2006
quotequote all
id say front too stiff. try running front shocks a couple of clicks up on the rear, my car did this badly the other week and we discovered that the rear radius arms where binding in the frame - not enough tolorance in the pins, arms, washers, brackets to allow for toe and camber.

its all part of the fun!

kjw

Original Poster:

49 posts

237 months

Monday 5th June 2006
quotequote all
Thanks for the suggestions will try some alterations to the damper setting next time out. I would be interest to know what sort of damper setting mini 7's or miglias use.

guru_1071

2,768 posts

241 months

Monday 5th June 2006
quotequote all
it will depend on the dampers!

dont forget migs and 7's use funny (i.e not road legal or construction) tyres so everything is different.

i use avo's rear set to 10, front set to 11.

seems to work ok

kjw

Original Poster:

49 posts

237 months

Monday 5th June 2006
quotequote all
What is the max setting on a AVO

guru_1071

2,768 posts

241 months

Monday 5th June 2006
quotequote all
24 i think

love machine

7,609 posts

242 months

Monday 5th June 2006
quotequote all
I'm running a bit too much rear tow in and so it goes into 3 wheel mode and then tries to get itself back on 4 again causing a weave effect. I am running quite a lot of -ve camber on the rear as I want it to grip more than it does, it sounds like you are very light at the back and a bit loose. I'd practice throwing it at corners as it took me a while to get used to it.

For the record, I measured my front and rear axle weights, found the ratio and then set the front shocks dead hard and the rear ones that much backed off, I did it with the camber also and it worked fine, I think it's about -2.75 deg at the front and -1.something at the rear, it works fine from that starting point.

Good luck, also, have a look at your tyre pressures. Again, apply the weight bias thing with the best grip you can get at the front which you have to experiment with. Stu