greymouser7
Well-Known Member
Fast ratio is a C-body arm?
Does a manual vehicle have different arms?
Does a manual vehicle have different arms?
Pitman & idler arms part or the suspension
- Thread starter greymouser7
- Start date
kkritsilas
Well-Known Member
I think the fast ratio arms came from the AAR 'Cudas/Challenger T/As.
Kostas
Kostas
greymouser7
Well-Known Member
So the idler arms are the same?
kkritsilas
Well-Known Member
Firm Feel has an article on the fast ratio pitman and idler arms here:
http://www.firmfeel.com/ackerman_fmj.html
The short story is that you can use a long pitman arm with a short (stock) idler arm, but at extreme steering angles, there is an Ackerman steering issue. According to them, this should only be noticeable for things like parking maneuvers, but read the article to be sure that this is what you want out of your car.
Kostas
http://www.firmfeel.com/ackerman_fmj.html
The short story is that you can use a long pitman arm with a short (stock) idler arm, but at extreme steering angles, there is an Ackerman steering issue. According to them, this should only be noticeable for things like parking maneuvers, but read the article to be sure that this is what you want out of your car.
Kostas
greymouser7
Well-Known Member
Kostas link:
The Ackerman Story
"Ackerman steering", and "the long idler arm"
The long, (FAST RATIO) pitman arm we offer is basically the same arm used on the AAR's and T/A's. The stock T/A set-up = long (FAST RATIO) pitman arm and a short (stock length) idler arm. We heard that screws up the Ackerman steering. So we put a car on turning plates to test that, and find out. Turning plates or toe plates lay underneath the front tires and read turning angle for each tire independently as you turn the steering wheel. Ackerman steering, means that as you turn the steering wheel, the inside tire turns about 3 or 4 degrees more than the outside tire so both tires are arching equally giving you ~ "zero scrub". We tested this in 3 different modes: First, short pitman and short idler (ie. Your car, stock), Second, long pitman and short idler (ie. T/A, AAR stock), Third, long pitman and long idler (recommended).
RESULTS: 1) short/short = OK ackerman throughout sweep. Result: 2)long/long = OK Ackerman thru out sweep. Result: 3)long/short = OK ackerman thru right hand sweep and OK ackerman up to about 20 degrees left. From ~20 degrees on out , the Ackerman gets exaggerated to ~10-12 degrees. We do not think this really adds up to very much in your overall performance driving picture, because 20 degrees is a pretty tight turn , more like a parking maneuver than anything else. But, why not get it as good as you can get it? Conclusion, If you can, use the long idler.
thanks brother
The Ackerman Story
"Ackerman steering", and "the long idler arm"
The long, (FAST RATIO) pitman arm we offer is basically the same arm used on the AAR's and T/A's. The stock T/A set-up = long (FAST RATIO) pitman arm and a short (stock length) idler arm. We heard that screws up the Ackerman steering. So we put a car on turning plates to test that, and find out. Turning plates or toe plates lay underneath the front tires and read turning angle for each tire independently as you turn the steering wheel. Ackerman steering, means that as you turn the steering wheel, the inside tire turns about 3 or 4 degrees more than the outside tire so both tires are arching equally giving you ~ "zero scrub". We tested this in 3 different modes: First, short pitman and short idler (ie. Your car, stock), Second, long pitman and short idler (ie. T/A, AAR stock), Third, long pitman and long idler (recommended).
RESULTS: 1) short/short = OK ackerman throughout sweep. Result: 2)long/long = OK Ackerman thru out sweep. Result: 3)long/short = OK ackerman thru right hand sweep and OK ackerman up to about 20 degrees left. From ~20 degrees on out , the Ackerman gets exaggerated to ~10-12 degrees. We do not think this really adds up to very much in your overall performance driving picture, because 20 degrees is a pretty tight turn , more like a parking maneuver than anything else. But, why not get it as good as you can get it? Conclusion, If you can, use the long idler.
thanks brother
