Steering rack location
Steering rack location
(OP)
Friends,
I was recently reminded of a discussion where a fellow went on at great lengths about all he had to do to put his steering rack behind the front axle centerline rather than in front as delivered. Now as I read and ponder the mysteries of suspension and handling I keep coming back to the WHY of the above.
Other than packaging, is there any intrinsic advantage to a rear steer rack over front steer? Is gyroscopic precession a factor? I don't see any geometrical difference between the two.
Thanx in advance, Steve
I was recently reminded of a discussion where a fellow went on at great lengths about all he had to do to put his steering rack behind the front axle centerline rather than in front as delivered. Now as I read and ponder the mysteries of suspension and handling I keep coming back to the WHY of the above.
Other than packaging, is there any intrinsic advantage to a rear steer rack over front steer? Is gyroscopic precession a factor? I don't see any geometrical difference between the two.
Thanx in advance, Steve





RE: Steering rack location
The need or desire to have partial or full Ackerman is a whole different discusion!
Tom Higgins
RE: Steering rack location
The big argument in favour of a forward rack is that any compliance in the lateral arms in line with the wheel will contribute understeer rather than oversteer.
I agree with the OP, I can't see a gyroscopic advantage
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Steering rack location
aday
RE: Steering rack location
But another big reason I like it has nothing to do with dynamics. I like the fredom of routing the exhaust in a more free flowing manor. When the rack is behind the wheel center, you always have to find a way to route the exhaust around it and make sure it doesn't get to close to the inner tierod boots(heat damage). This usually results in a comprimised series of odd angles and massive head losses due to the amount of bends needed to position the exhaust in such a confined space. It can also limit your front legroom by a bit.