I've been meaning to get back here for a while & comment on something but I've yet to find the time to dig very deep into why so I can explain it effectively... but the upshot of it is...

Regarding my earlier post about how to "correct" the anti-dive results.... ignore it... it's wrong.

But, it's wrong not because that method wouldn't work.... it would....

IF the program was calculating anti-dive the proper way to begin with... it's not... the method used by the program to generate the anti-dive number is being done in a way that I've never heard of, and to what I've been able to calculate, isn't even close.

My 1st clue was when I changed the tire size for the suspension I've been looking at in the program... I adjusted the outer ball joint/rod end "Y" locations & changed the tire diameter... I left all the chassis location points the same... effectively, I put on a different tire & then "reset" the chassis height.

Why then did I get a different result for the anti dive?

Where the outer ball joint is located shouldn't matter... at least not the way I've understood anti-dive to be calculated for the last 20+ years.

As they say, a picture is worth 1000 words....

So, then I went out to the shop & drew a "mental picture" of the side-view instant center of the car... sure enough, it should have been somewhere close to ground level.

Armed with that knowledge, I looked at the chassis measurements, pulled up a trangle calculator, & went to work... a few minutes worth of calculations set the SVIC at 129" foreward & 1/2" above ground... that being the case, for the anti-dive to be -30% would mean that my car's CoG would need to be barely an inch off the ground... which it's not.

By the "correct" calculations, my anti-dive is about -1.5%.... a HUGE difference.

Bottom line... if you're using this program for a front suspension, ignore the anti-dive calculation... it's not even close.

The formula in the above image will give you the correct figure... of course, you first need to locate your side-view IC... which you can do with any triangle calculator you can pull up via Google search & your A-arm chassis mount locations... it takes a few minutes to plug in the numbers & solve the various triangles.. but much quicker than drawing it out on paper (for me anyway)... Once you do that you can either plug the result into the formula above, or (what I find easier) skip the trig problem & just do another triangle calculation to find the angle of the 100% line... then divide that into the SVIC-to-front tire contact point line angle(the angle noted as 5.4deg in the above image)

(SVIC line angle / 100% line angle) * 100 = Anti-Dive%