[Fot] Mods for camber

[Larry Young]

Ah, so you have Karon's Ambro.  Your laser setup is trick.  I did this 
back in 2003 and did everything with a homemade bumpsteer gauge and shop 
tools.  I was able to measure a camber curve that matched the Triumph 
specs and get good agreement between the calculations and measurements.  
I spent a lot of time going back and forth between the shop and the 
computer. My report gives all the numbers I got, including when I 
compared moving the inner pivot versus shortening the A arms.

Bill Babcock wrote:
> I also used FSGP but I prefer SusProg3D, it's how I set Peyote up. I don't have my notebook here (in Hood River) but from memory, the amount of camber gain with the upper arm shortened increases substantially from an already too high value. I also directly measure camber gain and bump steer using a laser reflected off a very flat mirror onto graph paper stuck on the wall. The results are pretty shocking for stock TRs and most racing set ups. I'll take a look at the Ambro today (I'm on my way to Portland) --current owner is well known to me--it's me. I don't think the shock tower was modified. The Ambro has many handling problems and the suspension is more than a bit of a bodge. I'm in the process of peyotifying it. 
>
> I ran hundreds of roll/bumps with suspension tweaks with FSGP and had a very hard time getting them to fit directly measured results. The biggest challenge seems to be that the trunnion cannot be properly represented in FSGP so you have to run two runs of every tweak and approximate. If the trunnion were a heim or ball joint the lateral pivot plane would be the same as the vertical plane--but it is offset by about 3/4". That's a big issue. Beven Young, who wrote SusProg3d added trunnion suspension options at my request, though looking at the marketing info for current version it seems to have slipped away--but I bet it's still really there. It's a lot better software, but it's expensive: A$335 though updates are always free and the support is terrific. I've had it since it first came available and Beven has never charged for anything since--even adding trunnions. 
>
> As you say, the biggest challenge is getting the measurements. I had to build all kinds of tools to get them accurately. You also need a very flat floor.