Gocart steering

[madsvlund]

The work of this evening, steering quickner ratio 1:1,5 will give a reduction from 3.2 lock to lock to 2,1 LtL

[tomtrout]

Go kart steering when its moving but it might be like a bus to park!

I think with the width of your tyres I would be tempted to stick with the original ratio. I guess for a track car it isn't an issue so depends on how and where you will be using your car.

[madsvlund]

I have hydraulic servo on the car, so parking is one-handed. And the car is used 50-50 for sunday drives and tarmac rally sprints / hill climbs.

Main issue is normally "over assisted" servo's in combination with quick ratios, equal a very sensitive steering at high speeds. But as my rack is non liniar, do I hope that it will be quick, but still controllable at high speeds

[tomtrout]

Why am I surprised. Anybody who had GPS speedo is bound to have power steering! Your engineering skills are light years ahead of mine Mads so good luck with your quick rack.

[griff 200]

Sorry mads you have lost me. A non linear steering rack ?? I would have said that a rack was linear in action ? You're gear box can't be two spur gears as it would be reverse. But shafts are offset so can't be epicyclic.

[madsvlund]

Non liniar rack's is a german engineering masterpiece.

description on
http://www.autospeed.com/cms/article.html?&tit...

[phillpot]

griff 200 said:

But shafts are offset so can't be epicyclic.

Simpler than that........

[griff 200]

Well there you go !!! Thanks lads never to old to find out more cool stuff ( I am a sad bas erd). Richard

[status]

Hey Mads

What donor car did your non-linear rack come from please? I did a search and found from another of your posts that you say it is "Bmw rack with a 3,7 lock to lock ratio" but couldn't see the donor car mentioned.

cheers
Nick

[madsvlund]

Hi Nick, I think most modern cars use non liniar rack. Mine is from a E46 320, 2001

E36's are liniar (most of them) and std. E46 is progressive. If you want a non hydraulic rack, they allso comes in non liniar, and you could add a corsa electric power assist on that. I just bought ont that will go on a triumph Spitfire

Ratios listed here:
http://www.bimmerforums.com/forum/showthread.php?1...

[status]

Thanks Mads

My standard rack is good so I will go with that for the moment, but I am quite interested in the combination of standard ratio around the centre point and progressively faster towards full lock.

cheers
Nick