J's Racing or Spoon Roll Center Adjuster
#1
03-31-2009, 02:04 PM
J's Racing or Spoon Roll Center Adjuster
J's Racing Roll Center Adjuster - Honda Fit/Jazz 06-08 (GD3/GD4)
WHAT IS ROLL CENTER ?
While a vehicle corners, the movement of suspension is focused on the intersection (instant center) of the lines extended from the upper and lower suspension arms.
The intersection between the line from where the wheel contacts the road to the instant center (Point P) and the vehicle Body centerline is the roll center (Point B).
With the stock suspension, the appropriate roll center has already been set from the factory. (Fig. 1)
ROLL INCREASES AFTER LOWERING?
Simply lowering the car results in an increase in the distance between the center of mass (Point A) and roll center (Point B) of the vehicle, even though the center of mass has dropped.
When the distance between Point A and B increases, roll stiffness decreases, causing an increase in the amount of roll. The amount of roll can be controlled with the use of stiffer springs, but ride quality etc. suffers as a result. Cornering speed does not increase like originally thought. (Fig. 2)
ROLL CENTER ADJUSTED !
With the Roll Center Adjuster in place, the angle of the lower are is revised. Roll center (Point B) is once again close to the center of mass (Point A) of the vehicle.
With the lowered center of mass and increased roll stiffness, the limit of cornering speed increases.
ROLL CENTER ADJUSTER FF
When a FF vehicle is lowered, the angle of the lower arm becomes poor, resulting in a significantly lowered roll center.
Consequently, the amount of roll in corners increase and the cornering force is sacrificed.
By extending the ball joint of the front knuckle, the position of the roll center is altered. Replacing the stock ball joint with this product will result in reduced roll, and cornering force as a result is increased. Steering response is alsoimproved. This product is the long-awaited part for FF vehicles.
Details
SKU SKU1270 Weight 2.00 lbs Price: CAD $308.00 (Approx. USD $ 236.85)
WHAT IS ROLL CENTER ?While a vehicle corners, the movement of suspension is focused on the intersection (instant center) of the lines extended from the upper and lower suspension arms.
The intersection between the line from where the wheel contacts the road to the instant center (Point P) and the vehicle Body centerline is the roll center (Point B).
With the stock suspension, the appropriate roll center has already been set from the factory. (Fig. 1)
ROLL INCREASES AFTER LOWERING?
Simply lowering the car results in an increase in the distance between the center of mass (Point A) and roll center (Point B) of the vehicle, even though the center of mass has dropped.
When the distance between Point A and B increases, roll stiffness decreases, causing an increase in the amount of roll. The amount of roll can be controlled with the use of stiffer springs, but ride quality etc. suffers as a result. Cornering speed does not increase like originally thought. (Fig. 2)
ROLL CENTER ADJUSTED !
With the Roll Center Adjuster in place, the angle of the lower are is revised. Roll center (Point B) is once again close to the center of mass (Point A) of the vehicle.
With the lowered center of mass and increased roll stiffness, the limit of cornering speed increases.
ROLL CENTER ADJUSTER FF
When a FF vehicle is lowered, the angle of the lower arm becomes poor, resulting in a significantly lowered roll center.
Consequently, the amount of roll in corners increase and the cornering force is sacrificed.
By extending the ball joint of the front knuckle, the position of the roll center is altered. Replacing the stock ball joint with this product will result in reduced roll, and cornering force as a result is increased. Steering response is alsoimproved. This product is the long-awaited part for FF vehicles.
Details
SKU SKU1270 Weight 2.00 lbs Price: CAD $308.00 (Approx. USD $ 236.85)
#4
03-31-2009, 02:13 PM
how much are the spoon RCA? is there any difference between the too? if not then just get the cheaper ones. I didnt even know spoon made those.. I know a few people have the J's
#9
03-31-2009, 08:42 PM
do a search i already made a thread about this in the suspension thread.
kelso has these and from personal experience on his car he said your best bet would be to buy the LCA with roll center adj. on it.
http://www.n1concepts.com/J_s_Racing...-fcja-f1-l.htm
kelso has these and from personal experience on his car he said your best bet would be to buy the LCA with roll center adj. on it.
http://www.n1concepts.com/J_s_Racing...-fcja-f1-l.htm
#11
04-01-2009, 02:49 AM
they are a pain in the ass to install, and they are expensive but it makes your car feel more like it was supposed to be lowered from the factory. the drawbacks of them are, if you get a flat in the front, you cant use the spare tire. you will ruin your spare tire and the ball joints if you put the spare on. they are a PAIN IN THE ASS to install, and i mean shitty. i had one set but the anodized ring came loose and binded the ball joint in my control arm. i had to buy a new control arm and new roll center adjusters. just when you put them in, put some of the strongest loctite around the ribs that contact with the control arm and you will be good. ive never had problems with my sway bar end links being too short or too long because of them too. its a good investment but have a pro put them in and check them after a couple 100 miles to make sure they are sitting okay.
yea but its almost worth it just to buy the control arm with the ball joint already in it. like this.
thats what i would do if i had to buy a third set. the control arm from honda isnt the strongest of metal and if you dont use the proper press fitting, it WILL bend the shit out of your control arm.
thats what i would do if i had to buy a third set. the control arm from honda isnt the strongest of metal and if you dont use the proper press fitting, it WILL bend the shit out of your control arm.
#13
04-01-2009, 05:47 PM
good deal. probably going to wait awhile till you get them since there not instock
#19
04-01-2009, 10:40 PM
im pretty sure thats the case. but im also pretty sure that it varies wheel to wheel. all i know is that my spare tire was ruined and my rca was ruined too. they do sit lower in the wheel than the stock ball joints.
#20
04-02-2009, 12:55 AM
do a search i already made a thread about this in the suspension thread.
kelso has these and from personal experience on his car he said your best bet would be to buy the LCA with roll center adj. on it.
J'S RACING FIT FF roll center adjuster arm ASSY The left
kelso has these and from personal experience on his car he said your best bet would be to buy the LCA with roll center adj. on it.
J'S RACING FIT FF roll center adjuster arm ASSY The left
However the RCA will fit on the USDM no problem...just annoying hard to install from what I heard.
EDIT: If wish I have my lower control out so I can take photos of it....