Suspension Geometry Calculator
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This utility can be used freely by any individual. Commercial use of this utility is strictly forbidden without the owners written consent. Email me at huwcdavies@hotmail.com for more information.
  Links: Below is the url to link to this page retaining the current data. Feel free to add this link to your site.
Hints: From the Competition Car Suspension book.
Short SAL (500 - 1000mm) gives very good roll centre location, keeps the outer wheel vertical in corners, but going badly to positive camber in droop and negative in bump (accelaration squat and braking).
Long SAL (1800 - 4500mm) provides lower roll centres but less control over their sideways movement, minimal scrub (track variation), poor outer wheel control going into positive camber, but only small camber change in bump/droop.
Medium SAL (1000 - 1800mm) is the transition area between long and short with, as you might expect, a bit of this and a bit of that.
Ultra-long SAL (near parallel) provides excellent vertical control of very low roll centres but possible enormous sideways movement, wheel angles virtually unaltered in bump/droop but very poor control of wheels in roll, with near equivalency to body roll angle.
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does anyone know of a site that could help me with set ups, what will effect certain problems i already have. such as bump steer, very twitchy at high speed, and so on. any help or direction would helpful
Good job!
Could you post the old mcpherson calculator please?
Thanks!
Great calculator. Thanks for adding “Scale”. MBN sends member this way to learn about suspension modeling and it is tremendously helpful.
Great calculator!
Would it be possible to add the ability to add tie rods to the calculator so bump steer can be observed and corrected?
Thanks
Very helpfull. can u make it so we can fill in the fields above with our own numbers, That way its more accurate to what pwople are fabricating. Thanks
Mr. Huw, can u include caster change,toe angle,tire scrub,rear swing arm length too..that will be very usefull..
Thnaks for the fascinating calculator though :).
Hi, Great calculator. I also suggest larger input perameters be allowed as my lower wishbone is 540mm and will not fit on the screen.
cheers
Peter
Thank you! Thank you! Thank you!…The trig was giving me a headache….On question; I am going to widen my wheel track by 4″ then run 5″ back space on a 8″ wheel, which will give me a positive scrub of 2 5/8′…My current scrub is 3 5/8 and a gain of Cam per 1″ of up travel is 1 degree, my wider track will limit this to .8 gain for the same travel…Would you do it, it will never see slicks- just street fun, and will probably have a .8 to .9 static negative camber to start with…thanks for your insight
Thanks for the constructive comments Ian. I will have a look when I next have a chance. It may not be for a couple of weeks though. Huw
Huw,
This is a great suspension calculator.
I have 2 small problems when using it:
1. My lower wishbone length is 470. The animation screen is too small to show it. Can you make the animation screen a bit bigger to allow for longer wishbone lengths?
2. I’m constantly having to scroll up and down during my setup to the numbers and to the animation.
Can you try to fit it all to one page size to make it easier to use?
Thanks and good luck with your racing season
Ian
Hi Huw
can’t seem to get it working.
figures are locked
and all I have is 3 colour bars and 4 4 point icons
any ideas or do you have a copy you could email me
regards
tony
running firefox
Okay, problem noted. It did work in Firefox. I’ll have a look.
It’s isn’t working in Firefox and Safary in Mac OS X
Hi Jon, I do have a mcpherson calculator as well but, I haven’t added it to the new layout yet. Huw
Works great, would also be nice to have one in standard, but thats me being lazy, so this works fine