pinion positioning

[turb_u_lent]

hi people....
i have a standard rack which has the pinion position not at center....
also the steering ration which it has too high for good steering it's approx 14:1

i need to place the pinion at the centre and reduce the steering ratio...thank u guys for reading and hope you would answer my query. http://fsae.com/groupee_common/emoticons/icon_smile.gif

[turb_u_lent]

hi people....
i have a standard rack which has the pinion position not at center....
also the steering ration which it has too high for good steering it's approx 14:1

i need to place the pinion at the centre and reduce the steering ratio...thank u guys for reading and hope you would answer my query. http://fsae.com/groupee_common/emoticons/icon_smile.gif

[Tushar]

Steering ratio can be altered depending upon the lengths of tie rod to steering arm. So, this can be changed as per your design of steering arm and thus the required steering ratio can be achieved.

[turb_u_lent]

but usually we get a set of rack and the steering rods attached to it..how can it be reduced...

you are saying that one must detach the arms and machine them off and then attach them..

how about the pinion positioning problem..the pinion is at the left of rack... i want it to be in the center..

[Mehul Botadra]

Get a new rack cut. There's no point in using a standard rack from a car. The offset wont work for a single seater car.

[BillCobb]

A rack does not have a dimensionless ratio. It transcribes rotary motion (deg) to linear motion (mm). The ratio you want is obtained as the ratio of the steering gear's pinion radius to the effective steer arm length.

You want the rack housing centered, not the pinion. This gives you equal length tie rods. Hopefully you can understand why that is necessary. If not, just ask !

[Mikey Antonakakis]

Maybe no one has said it obviously enough, but you can change the steering ratio (from steering wheel to tires) by changing where the steering tie rods connect to your uprights.

Also, I'm not sure the best place to buy it, but a quick google search of "stiletto steering rack" brings up several places that sell it for around $300 (for instance, chassis shop is one retailer, although they are a little more expensive). I'm not sure what steering rack you have right now, but if you need a smaller one, this is a good place to start, and what you get isn't bad for the money.

[abc]

do both gear ratio and steering ratio have direct effect on steering? how does gear ratio affects?