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PostPosted: January 4, 2013, 3:30 pm 
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Joined: May 15, 2007, 1:08 am
Posts: 60
Location: VA
Cool tool! I've now spent too many hours on it. Any comment on the following:

MG Rear Suspension

It's for an MG midget independent rear. Rear weight is roughly 800lb. Powered by 4age 20v. Using Miata parts.

Edit: The link doesn't go to my design, rather something that is remarkably different!!

Here are the particulars if anyone feels like putting them in manually:

Wheels/Tires:
offset: 1.77"
Tire OD: 21.75"
Width: 7.00"
Wheel Diam: 14.00"

Hubs/Uprights:
Hub to UBJ X: 5.90"
Hub to UBJ Y: 5.00"
Hub to LBJ X: 4.515"
Hub to LBJ Y: 3.70"

Control Arms:
Upper: 10.00"
Lower: 15.00"

Frame Settings:
Ride Height: 7.00"
Frame Center to lower mount X: 5.50"
Frame Center to lower mount Y: 1.00"
Frame Center to upper mount X: 9.00"
Frame Center to upper mount Y: 8.00"

Output:
R.C.: 3.80"
Static Camber: -.84 deg
Camber @ 3" bump: -4.19
Camber @ 1" droop: -.033
Camber @ 2.25 deg roll: +.58 deg
FVSA Length at static: 65.41"

I'm planning on 3" compression travel and 1" droop for 4" total. Next phase is packaging underneath the car. This should be fun- wish in a way that I was starting from scratch, but I like the way the Midget looks and have owned it forever, so....

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PostPosted: January 4, 2013, 5:51 pm 
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Joined: August 11, 2012, 10:56 pm
Posts: 187
Location: Arizona
I'll check this out now - post links really should be working properly at this point

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PostPosted: January 4, 2013, 6:43 pm 
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Joined: August 11, 2012, 10:56 pm
Posts: 187
Location: Arizona
Looks like the version number in your link didn't get updated automatically like it should have. I updated it and now your link looks like this:
MG Rear Suspension

Does that work better? If so, I can explain what happened. If not, I'll keep checking ---

-------------------------------
update: the more I look at your link and compare to the settings you gave, the more I think it got clobbered between version numbers. I'll check this out a little more tonight and probably tomorrow morning and get you a working link

Everyone, could you please keep some old versions of your links in case of this kind of problem, and I'll get this fixed soon. Apologies for the hassle. Ideally, this should just work transparently to the user.

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PostPosted: January 4, 2013, 8:50 pm 
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Joined: May 15, 2007, 1:08 am
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Location: VA
Beauty! Thank you! Now I wonder if it's a decent design, but the link works like a champ now.
test:

MG Rear Suspension

Edit: hey-oh! it works!

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PostPosted: January 7, 2013, 1:50 pm 
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Joined: August 11, 2012, 10:56 pm
Posts: 187
Location: Arizona
Vsusp update
- fixed old version number bug (wasn't updating version number on load)
- tool now loads in IE8/9. Not supporting IE7. IE9 works pretty well actually
- fixed noscript message styling in ie8/9
- fixed ie warning styling
- no longer disable "redraw on drag" for IE (IE9 runs the tool fast enough to use redraw-during-drag)

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PostPosted: January 7, 2013, 1:51 pm 
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Location: Arizona
Brust wrote:
Beauty! Thank you! Now I wonder if it's a decent design, but the link works like a champ now.
test:

MG Rear Suspension

Edit: hey-oh! it works!

Nice! I'm glad it's working ok now. Turns out the problem was just the version number not getting updated after the project was loaded, and it wasn't that your data got clobbered. :twisted:

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PostPosted: August 28, 2013, 1:19 pm 
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Location: Arizona
Vsusp update
    - added Macpherson strut: example project
    - mac strut dimension highlighters (in progress)
    - updated header nav
    - updated help page
    - added mouse position indicator
    - various calculation robustness fixes
    - fixed: kpi lines not disappearing on reset trim
    - fixed: wheels-below-ground bug
    - update some mouseover in template
    - adjusted IE warning test at startup (IE9+ ok)

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PostPosted: September 2, 2013, 12:11 pm 
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Location: Arizona
Vsusp update
    - added type-in support for roll and bump controls (thanks Cheapracer)
    - added sliding control for adjusting roll and bump together (thanks Cheapracer)

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PostPosted: September 16, 2013, 9:58 am 
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Location: Arizona
Vsusp update
    - fixed contact-patch-below-ground bug (thanks Cheapracer)
    - added mac strut dimension highlighers: left/right spindle length
    - moved to jquery 2.0, vsusp no longer supports IE8 and earlier
    - made close window message simpler
    - significant cleanup of code in draw functions
    - updated mouseover text for strut axis inclination
    - fixed handling of bad input values (eg. text in float field)
    - improved noscript message alert box

More details about the update

Up next:
    Next I'll take a look at the 'lock wheels' feature which will adjust the control arms length in order to retain a certain camber and track width. Probably will take a little while, though

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PostPosted: October 1, 2013, 3:12 pm 
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Vsusp update
    - just fixed a bug which was not allowing users to change string fields

More details

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PostPosted: November 17, 2013, 3:26 pm 
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Joined: November 1, 2007, 10:29 am
Posts: 143
Location: Central Coast Cal.
Rob7, thank you for all your work on this program. After reading many of the posts on front suspension design this is the one I got working. I don't understand what it is telling me yet but perhaps someone else could give me some hints.
Background- I bought this car (mostly apart) 3 years ago and built/rebuilt things numerous times, car is used on the track and now is only on the road for testing. This apparently is the first of the CMC cars and due to a driver error on the track I ripped off the drivers side front suspension. so good time to update, improve what exists.
I took the dimension of the spindles off and then checked with the dimensions from spindle posts by chetcpo ( I've read many of his posts - he knows much more than I) but my dimensions are giving me a closer picture to what I have seen on my car. All comments appreciated, thanks again Rob7 tremendous work.


Attachments:
suspension existing.PNG
suspension existing.PNG [ 69.27 KiB | Viewed 2440 times ]

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PostPosted: November 17, 2013, 3:48 pm 
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Location: Central Coast Cal.
Forgot - miata spindles. steering arm has modified from original position, I was working on zeroing out the bump steer using a laser.


Attachments:
IMG_0499e (640x480).jpg
IMG_0499e (640x480).jpg [ 204.02 KiB | Viewed 2440 times ]

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PostPosted: November 23, 2013, 7:16 pm 
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Joined: August 11, 2012, 10:56 pm
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Location: Arizona
Sorry all for being out-of-touch. I've been so busy for the last few months. :( I'm making some progress on my build, but unfortunately, Vsusp had to take a back seat for a while.

Thanks Twnpipe for the nice words! Regarding what Vsusp is telling you once the project is loaded in, this question has come up a few times before, so I think it could be helpful to have a link to a summary of that kind of info somewhere. It could be in the forum in an easy-to-find place or maybe in the tool's help page.

I believe some of the build logs have this kind of "now what?" info you're looking for. What I've seen was mainly discussing about roll center height. Sorry, I can't find example links right now

Time permitting, I can try to consolidate what the experienced builders/racers on the forum have said, but I am reluctant, personally, to say "do this" or "do that", because I'm relatively new to building.

I was thinking of something like a checklist of suggestions for what a builder can look at after the project is loaded in:
- RC height relative to estimated CG in different bump/droop/roll trims
- RC movement as vehicle moves
- how much camber correction to aim for at max estimated roll
.. etc

Of course the checklist shouldn't imply that that's all that's needed to make the car handle well and be safe. Hmm, must think about this

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PostPosted: November 25, 2013, 9:03 pm 
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Joined: December 22, 2006, 2:05 pm
Posts: 6122
Finally got around to trying vsusp. Anybody elses look like this?

Opinions?

Chet's spindle dims, stock miata rims and tires, 5.5" gc, so not a clean sheet effort.


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vsusp1.JPG
vsusp1.JPG [ 19.75 KiB | Viewed 2381 times ]
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PostPosted: November 26, 2013, 8:46 am 
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MV8 you're probably only interested in the center part of that graph, -2 to +2 degrees. You can adjust that stuff. It looks pretty normal to me. It is just a little aggressive on camber correction. You can reduce the angle of the upper arm a bit and maybe lower the roll center a bit and reduce the camber correction…

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