Anti-Squat 118 %
Roll Center Height 29 in
Roll Axis Angle 7 degrees (Roll Oversteer)
Instant Center X-Axis 78 in
Instant Center Z-Axis 24 in

This is on the rear and the weight s of the vehicle are just guestaments ast this point

Wheelbase 104.0 in
Tire Diameter 38.50 in
Tire Rolling Radius 19.25 in
Vehicle CG Height 25.94 in
Vehicle Mass 3,540 lb
Front Unsprung Mass 800 lb
Rear Unsprung Mass 700 lb

these are the link calcs

Upper Links x y z
Frame End 43.50 12.75 25.50 in
Axle End -2.00 3.00 27.00 in
Lower Links x y z
Frame End 51.00 21.00 21.00 in
Axle End 3.00 21.25 15.00 in

what would you change and why. I can change the anti-squat by raising the upper frame mounts to get a lower percentage,, would it be necessary though, this calc stuff is totally new to me

I would lower the AS to around 70 if it was my setup. It would seem that with a high AS the rear could bounce(similar to wheel hopping behavior with leaf springs) under load.

If I raise the mount for the uppers on the frame end 4.5", I can get it way down to this

Anti-Squat 73 %
Roll Center Height 28 in
Roll Axis Angle 7 degrees (Roll Oversteer)
Instant Center X-Axis 212 in
Instant Center Z-Axis 21 in

that is with the links at this

Upper Links x y z
Frame End 43.50 12.75 30.00 in
Axle End -2.00 3.00 27.00 in
Lower Links x y z
Frame End 51.00 21.00 21.00 in
Axle End 3.00 21.25 15.00 in

I think that's pretty good AS. Are you ok with the Roll Axis?

I have been playing with it some more, with some combinations I can get the oversteer down down to 3 and the AS down into 65 , I can do this by lowering the front lower frame mount down and raising the rear lower axle mount up and forward and only raising the front upper frame mount up an inch, I am gonna keep playing wit it and see what I can get

I would think an AS from 75ish to 60ish would be fine. I would minimize the roll axis down as much as you can. Maybe vetteboy or others will chime in.

what would you change and why. I can change the anti-squat by raising the upper frame mounts to get a lower percentage,, would it be necessary though, this calc stuff is totally new to me

Do you have a side view of the excel file so we dont have to plug the numbers in:D

What kinda sping are you going to use?

Anti squat with air shocks will have alot more movement then if you do some rear TJ coil spring fixed at each end...

You can learn to compensate and drive knowing how your design will react.

Can you move the axle end lower links up above the axle center and move the upper links at the axle end up too keep good seperation? That in combinaiton with moving the upper links higher at the frame end will give you a better AS number a more stable roll axis.

How do you do a screen capture, I could not remember how to do it, I have the 2.5 x 16 fox airshocks on it, I am out of town till next Week so when I get back I can post it since it is on my computer

Press the print screen button. Open paint, click edit and paste. Then File, save as, etc

Press the print screen button. Open paint, click edit and paste. Then File, save as, etc
ctrl+Alt+prt sc and you dont get the bottom tool bar and stuff..:flipoff2:

:flipoff2:

First pic is your dimensions. I think yours weighs more then you had it and your tires would be at 75 PSI to be that round... :flipoff2:

Second Picture I moved your lower links higer at the axle end and wider (same as mine), the upper links higher at both ends. The frame end lower links I triangulated and raised them inboard of the frame... this idea my not actually fit what you have but it would be very stable and lower AS... see if will fit. thats what id try for.

Mine is closer to 60% AS but it depends on how High I set my rear air suspension and how high my COG actually is.

I think your COG is way too low... that would be about your rocker pannel height...

On mine I only have 7in of vertical seperation at the axle. It was 8.5in ish but when I added the doubler My drive shaft got alot shoter and I had to point the pinnion up and lengthen my upper links.

I am worried about my seperation and ripping an attachment point. If It fails Ill make a new bridge for more seperation. Other then that I really like my setup.

I need to finish my front upper shock hoops and then get actual weights so that I can get my real center of gravity figured out. I was just playing with it mostly to get a feel for the calculater. I will play with it some more when I get back next week. I figure the practice will help when I get all my proper info in and then I will have ideas for what to try in different combinations. The main reason I started this thread was to get an idea of what type of numbers I need to be shooting for since I am just learning this program and had no idea whatsoever what I should be trying for. So far I really like the calculater and it is really easy to use once Triad explained to me what the Y,X,Z numbers are and how to get them.