Roll center adjuster

[d1nzfe]

Anyone on these? They are very pricey though.
Supposed to lower the roll center after u lowered your car. Reduce roll during cornering.

[Bluevitz-rs]

Perhaps you could put a link up to what they are and what they do. I've never heard of them.

[d1nzfe]

http://www.technotoytuning.com/media/rca_diagram.gif

[Bluevitz-rs]

At stock ride hight the arm is pointing slightly downward, not straight out. So unless you're more than 2" lowered, you shouldn't need something like that.

[d1nzfe]

definitely more than 2". Any trackies comments?

[djct_watt]

Based on the picture, wouldn't that piece just raise right back up to stock height?

[lilredrocket]

They are not needed the Yaris has a feature likes this built in. Here is a whole thread on it: http://www.yarisworld.com/forums/showthread.php?t=23911 also here too http://www.microimageonline.com/forums/showthread.php/703-Free-Rear-Suspension-Mod!!!!

[d1nzfe]

They are not needed the Yaris has a feature likes this built in. Here is a whole thread on it: http://www.yarisworld.com/forums/showthread.php?t=23911 also here too http://www.microimageonline.com/forums/showthread.php/703-Free-Rear-Suspension-Mod!!!!


I got it, BUT I am now talking about the front.

[djct_watt]

Yes, and the built in feature moves the appropriate pivot point. This mod only adds more length to the strut, which defeats the (cosmetic) point of lowering a car. This would be great if all you wanted was to stiffen the suspension, without lowering the ride height. . . which is actually something I am interested in (ground clearance is an issue here in Thailand), but I'd probably rather go with coilovers instead.

[markitect]

I think the main purpose of these is probably to correct alignment. I think some adjustable camber bolts, and you will be fine

[Bluevitz-rs]

The purpose is to adjust the angle of the lower FRONT control arm.

At stock ride hight, the arm is angled down slightly. When the suspension compresses in a corner the arm pushes out the bottom of the tire creating negative camber. If the arm is already straight out, it can only create positive camber as the suspension compresses.

The diagrams in the 3rd post illustrates what happens pretty well. Remember that the strut will only allow up and down movement, but the control arm moves in a circular sweep.

[djct_watt]

^ and to properly adjust the geometry, you would need to move the pivot point on the control arm, not adjust the length of the strut (which is what the blue piece does).

On a geometry standpoint, the picture is all wrong. . . but it's probably because a 3rd grader drew it on MS-Paint. There's really no point in me arguing about it. It's impossible to say what the heck it even does without a proper picture.

[d1nzfe]

now, we need somebody who actually know the picture here.

[Bluevitz-rs]

^ and to properly adjust the geometry, you would need to move the pivot point on the control arm, not adjust the length of the strut (which is what the blue piece does).

On a geometry standpoint, the picture is all wrong. . . but it's probably because a 3rd grader drew it on MS-Paint. There's really no point in me arguing about it. It's impossible to say what the heck it even does without a proper picture.


Roll center adjuster for honda (http://www.nengun.com/js-racing/roll-center-adjuster)

[djct_watt]

No need to be rude. Thanks for the pic. Is that the same exact piece?

[kngrsll]

they even make them for the vitz! http://www.nengun.com/moonface/front-rollcenter-adjuster-pro

[Bluevitz-rs]

Same idea. If you could get the stock ball joint out and replace it with a longer one, you regain the slight downward angle of the control arm. You technically should have one for the tie rod too to prevent bump-steer.

[d1nzfe]

its is available for vitz thats y i asked..

[kngrsll]

i see the logic behind them, but i still havent heard of anyone using them.

[britishbikes]

It seems like the thing would correct bump steer related to lowering, as the relationship between the lower control arm and tie rods is retuned to normal, as well as improving camber durning cornering. I don't think it would affect the spindle to strut distance and thus not affect the ride height. The kit is basically an extended ball joint to get the correct control arm droop.