[shockey`]

allright, well i know the wrx's ratio is 16.5:1 and the STI is 15:1, and I understand what changes(the amount the wheels move for each measured input on the wheel) but what exactly is the 16.5:1 and 15:1 comparing? 15 parts of 1 what?

[Majin]

if you have your wheels pointed straight ahead, and turn your steering wheel 360° to one side, and read 36° (from the straight starting point to the angle line the inside of your tire is at now from the center line), dividing this into 360° gives you a quotient of 10. that's equal to a 10:1 steering ratio.

a 15:1 ratio would yield 24° which means one full turn of your steering wheel provides less angle, which means your steering ratio is less "responsive" than a 10:1 ratio.

so your 15 parts is parts of a full circle. you would need to turn your steering wheel 15 times in one direction to complete a full circle at the wheels.

[shockey`]

thanks alot majin, now heres another question: what ratio do the wrc cars use? I know they have around 504 degrees of wheel travel but i dont know what angle their wheels lock at, and cant find what ratio they use. so if you know, post up!

[Majin]

i have no idea. sorry.

[SWortham]

With a little Googling I found this info on the '06 Focus WRC car...

Steering Overall Ratio 12:1
Turns lock to lock 1.50
http://www.conceptcarz.com/vehicle/z13153/default.aspx


I don't know about the others though.

EDIT -- just found an '06 STI WRC car...
Steering Overall Ratio 15.2:1
Turns lock to lock 2.70
http://www.conceptcarz.com/vehicle/z...C/default.aspx


However, with as much as they change these cars according to the stages they run on, it wouldn't surprise me too much if they change the steering ratios as well.

[shockey`]

that cant be right, theres no way a stock sti has a quicker steering rack ratio than a wrc car(15:1 compared to 15.2:1) lol, but it got me thinking, i wonder if each driver has theirs customized how they like it? Ive never read anything about the wrc regulations regarding steering ratio.

[Rootus]

Originally Posted by shockey`

that cant be right, theres no way a stock sti has a quicker steering rack ratio than a wrc car(15:1 compared to 15.2:1) lol, but it got me thinking, i wonder if each driver has theirs customized how they like it? Ive never read anything about the wrc regulations regarding steering ratio.

I could believe it. At the speeds a WRC car moves, I'd not want a super quick rack.

[SWortham]

That's kinda what I was trying to say. It could be that they change the steering ratios for certain races. I mean, they go through the trouble of making huge changes to the setup depending on how much tarmac is on the stage vs gravel, and so on. It'd only make sense that changing steering ratios might be part of their tuning.