I have heard of a Whiteline adjustable front bar, but I think it was discontinued a couple years ago.

 

the torsional rigidity of a hollow pipe is much more than a solid pipe. image how much strength it take to twist a straw. therefore it can be smaller in diameter than a solid anti sway bar, yet have the same solid structure.

 

interesting. I think physics disagrees with you though.

 

Yeah....no.

 

^ not following the straw logic...I'm not an ME but I cant even begin to comprehend how that could be possible. I dont think I need a physics or engineering degree but rather common sense to call BS

 

I = pi/4 * ( Do^4 - Di^4 )

Its as simple as the Inertia of the solid part minus the area that's missing.

 

A thought on adjustable sway bars. Front bar specific.

A local Autox'er to me experimented with drilling the stock front bar (while still in the car) to make moderately adjustable. I haven't spoken to him since, but I will try and contact him about it.

 

^There is a how to on here about drilling the front bar; I will try and find it and post the link. I drilled mine but I cant comment on a difference in feel since I changed other things at the same time. I wanted a stiffer bar in front to match my 25mm Perrin in the back so I figured I would give it a shot.

I think drilling the stock mount and utilizing the Cusco adjustable mount, may be a good alternative to gain some stiffness and adjustability in the front without going through the hassle of putting in a larger front bar. I have no idea how much of an affect it will have nor do I know if the stock endlinks can handle that much abuse but it would be an interesting alternative.

EDIT: Here is the link https://www.evolutionm.net/forums/ev...djustable.html

 

I think it was Dallas that did the math on the drilled stock bar, yeah? reports range from 8% to 20% stiffer than the stock hole, it's gotta depend on where exactly you drill that second hole though, lol...

and yes, I've contacted a handful of the different manufacturers and only heard back from one, Perrin. So props to Perrin ...not so much the others. I'll get on the phone at lunch and see what else I can come up with.

 

Thanks for going out of your way to gather this info and compile the list

With respect to the front bar, in terms of the math would modding the front bar and using the Cusco mount equate to (8%-20%) + 16% or would it be more than that? I'm thinking the latter but my math skills are quite rusty...

To explain what I mean lets use a simple example:

Factory sway bar is 100 (totally arbitrary number)

Lets say modding it makes it effectively 10% stiffer so that 100 is now 110

Now the Cusco mount adds 16% stiffness but is that to the original or to our new figure of 110? AKA is it (100 * 1.16) +10 or 110 * 1.16

 

..new figure, 110 * 16%

lol, I just got off the phone with H&R, "we do not release our bar rates to the public" ....err, so then how do I know if it's a product that will work for me... I said thank you and good bye before they could answer...

 

https://www.evolutionm.net/forums/ev...ybar-rate.html

Leg length change (If my math is correct): 1 - Anew^2/Aold^2

 

Its relatively cumulative. The cusco mount changes the bar motion ratio and redrilling changes the bars effective rate. So is the second value, 110* 1.16

 

You can add Cusco Rear sway bar to your list.

Mitsubishi - Evo VII/VIII - CT9A - Rear 23mm - 103/115/125%

 

so, from picking up on this thread where you measured "A"as 9" and the new hole is 3/4" inboard of that....

1-((8.25^2)/(9^2))=0.15872

???