Does anyone know, from tech specs or your own measurements perhaps, the stock front and rear center-of-gravity heights and/or roll-axis heights? JZR maybe? Saini? Anyone?

 

Front and rear CG heights, you mean the mass centroid axis? Sounds like you've been reading too much Carrol Smith!

Your car, with its lowered springs, will be a bit different than stock. I myself haven't taken the time to measure this stuff, though cg location can be determined easily enough with some scales and a big jack. Roll centers take a bit more work in that you have to measure in 3D space the location of each suspension pivot point, and then you have to accept that 1) your measurements won't be perfect, and 2) with sloppy rubber bushings even if they were they still wouldn't be indicative of things under cornering load.

The only english-speaking people that I imagine have taken the time do something like this would work at Tri-Point or King Motorsports. There's also a chance the King folks have access to this information through the Mugen<->Honda R&D connection.

If you do find this info somewhere, please feel free to share! There are a number of free suspension analyzing packages out there, and the S2000's race-car standard SLA setup should be compatible with any of them.

Good luck on a worthy endeavor!

 

Milliken & Milliken actually. Thanks for the reply. Yes, I'm working on a spreadsheet to do some rough calculations of LLTD, but these two parameters, as you know, are key.

For the visualization-challenged, could you describe your CG-measurement technique with the scales and jacks?

 

Milliken, good stuff...

With a standard 4-scale setup you can determine the fore/aft location of the CG. The height is a bit trickier - check out this pdf file; the procedure I referenced they call the "lifting method". Oh, and don't freak out when you see what vehicle they use in their example; it's all the same.

 

How about the motion ratios?

 

It's my plan to use the cold Winter months trapped here in the North to measure this stuff and plot it on a suspension analysis software. But I might have to charge for the results! It's gonna be hours laying on a freezing cold slab of asphalt and then hours in front of a laptop analyzing the data.

So would anyone be interested in buying the file if I get off my duff and create this? And how much would you be willing to pay? I need some motivation to get into the garage!

-Jason Saini
www.over6racing.com

 

[QUOTE]Originally posted by Jason Saini
It's my plan to use the cold Winter months trapped here in the North to measure this stuff and plot it on a suspension analysis software.

 

I've had a copy of the Motor Vehicle Manufacturers Specifications (MVM Specs) for a while, and it just dawned on me that it lists both the front & rear spring rates & wheel rates. So, using these Honda supplied values, the front motion ratio should be 0.8160 and the rear 0.7721. I'll probably measure it myself anyway sometime this winter...see how close I can get measuring a shock travel directly with no spring or dust boot on it.

HTH,
Steve

 

[QUOTE]Originally posted by Gregg Lee
You might measure bump steer directly while you are at it.

 

talk about bringing a thread back from the dead, but i was wondering if you guys have any new findings, and possibly a modification for the rear toe control link to change the rear roll steer