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Topic Review (Newest First)
02-13-2020 10:00 PM
VHD44 http://bushie39.com.au/wp-content/up...V4.0-Beta.xlsx


https://www.pirate4x4.com/forum/gene...st-help-9.html
02-13-2020 09:15 PM
yota-tota
Quote:
Originally Posted by Provience View Post
as an example, the post #6 picture has a flat to the earth upper link and a lower link with about 2" higher on the frame side and Anti-squat of ~129%

if we raise the upper link frame side to be 1" higher than the upper link axle side and leave the lower link the same, anti-squat goes to ~77%

if we were to leave the upper link flat to the earth and reduce the frame side lower link mount 1", so that it is now 1" higher than axle side, anti-squat goes to ~65%

if they are both near parrallel to the ground, A/S goes to near zero.

hence why upper link brackets very commonly have adjustments on the frame side
Perfect! Those numbers seem to be in the ball park for what i want, will raise the upper an 1 and with the wider lower axle end will make it a little more stable in higher speeds.
02-13-2020 09:05 PM
Provience as an example, the post #6 picture has a flat to the earth upper link and a lower link with about 2" higher on the frame side and Anti-squat of ~129%

if we raise the upper link frame side to be 1" higher than the upper link axle side and leave the lower link the same, anti-squat goes to ~77%

if we were to leave the upper link flat to the earth and reduce the frame side lower link mount 1", so that it is now 1" higher than axle side, anti-squat goes to ~65%

if they are both near parrallel to the ground, A/S goes to near zero.

hence why upper link brackets very commonly have adjustments on the frame side
02-13-2020 08:59 PM
Provience
Quote:
Originally Posted by yota-tota View Post
If i go wider on the lower link axle separation to 17 ( Y value ) will it lower the anti squat?
No, it will change your roll center and under/over steer (it would net you a less oversteer). as wide on the axles as you can get your lower links, the better it will handle and the more stable. obviously you'll run in to your knuckles at some point, so don't go that wide.

if you want to lower your anti squat, you would need to change your slope of your upper link. that is really the easiest way. it needs to change relative to the lower link, but typically you don't get as much room to play with the lower link.

the more flat to the earth at ride height you can get your lower link, the happier it will be (smoother, less changes, etc.). once you know how close to flat you can get your lower link without hanging down too far under your frame, then it is easier to play with the upper link slope.
02-13-2020 08:52 PM
yota-tota
Quote:
Originally Posted by Provience View Post
alright, well if i'm still guessing things wrong, then you'll need to go put a tape measure where you want to put your holes, then post them up in the relative to axle C/L, relative to chassis C/L and relative to ground format

Attachment 2964064

Attachment 2964066

If i go wider on the lower link axle separation to 17 ( Y value ) will it lower the anti squat? Also raise the upper link height Z at the axle to 25.
02-13-2020 07:49 PM
Provience alright, well if i'm still guessing things wrong, then you'll need to go put a tape measure where you want to put your holes, then post them up in the relative to axle C/L, relative to chassis C/L and relative to ground format

Attachment 2964064

Attachment 2964066
02-13-2020 07:36 PM
yota-tota Ok the lengths are eye to eye for the links with a 2” tab from axle to centre of the bolt, and my vertical at the axle would be more like 6.5. That should look a bit better on the anti squat lol roll axis seems decent. Its been a while since i used one of those calculators, wheel base is 109 on 36’s like 22” frame hight hopefully.

Sorry for the hackness dude. Checked out Billavista and seen lots on building links just nothing for the calculator.
02-13-2020 07:27 PM
Provience
Quote:
Originally Posted by yota-tota View Post
Thanks man!

Heres some numbers i got for the front

Lowers - 30 long, ~ 2 below the frame, maybe 30 horizontal at the axle and 28 at the frame....might need to go a little more on the frame end.
Uppers - 31 long, ~ 2 above the frame so 4 of vertical and 4 of horizontal between upper and lower at the frame and 11 horizontal at the axle maybe 9-9.5 of vertical at the axle.
Panhard - 32 long not sure if u need numbers on axle end hight or frame end. Would be parallel with draglink.

Gonna run 12 2.5 sway away air shocks i already have with as little lift as i can get away with. Got the link numbers from a linked Ftoy.
alright, so the numbers for the program are based on their location relative to the axle | (x) and the frame center line -- (y) and from the ground _ (z)

so I made my best guess as to what you meant also, center of gravity, weight and wheel base all play a role as well.

When you say "link is 31" long" are you talking about the physical length of the link eye to eye (which is the hypotenuse of the triangle) or "the axle eye mount will be 31" forward of the frame eye mount" ?

Attachment 2964060

Attachment 2964062
02-13-2020 06:58 PM
yota-tota
Quote:
Originally Posted by Provience View Post
huh, I thought for sure it was on patparts.com and billavista.com

what's yer numbers? I've got a copy of the 3 link calc and can plug them in and screen shot it onto here for you
Thanks man!

Heres some numbers i got for the front

Lowers - 30” long, ~ 2” below the frame, maybe 30” horizontal at the axle and 28 at the frame....might need to go a little more on the frame end.
Uppers - 31” long, ~ 2” above the frame so 4” of vertical and 4” of horizontal between upper and lower at the frame and 11” horizontal at the axle maybe 9-9.5” of vertical at the axle.
Panhard - 32” long not sure if u need numbers on axle end hight or frame end. Would be parallel with draglink.

Gonna run 12” 2.5 sway away air shocks i already have with as little lift as i can get away with. Got the link numbers from a linked Ftoy.
02-13-2020 05:47 PM
Provience huh, I thought for sure it was on patparts.com and billavista.com

what's yer numbers? I've got a copy of the 3 link calc and can plug them in and screen shot it onto here for you
02-13-2020 05:20 PM
yota-tota
3 link calculator download?

Been trying to find the 3 link calculator but the one in the faq didnt work for me. Can someone run some numbers for me or post up a working link?

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