I will update the IRS single trailing arm thread soon. I have completed one arm and now building some pedestals to weld to a table to verify the thinking. I probably won't go back and change anything that is already done but at least I will know what is up and make the best of what I have with...
I thought the whole thread was great. Thanks to all for participating and I have changed some mounting thinking on a current IRS build.
I believe we are waiting for some follow-up GoPro. Cheers to Ron for hanging in there.
A rookie.
LOL ... Well they are pretty tough even for the above average driver on fairly tough terrain. Not your Sunday Golf Cart. The guys I key off of are the top 5 guys winning the brutal races. Not track. They are usually problem solvers first with help from small shops and then Racers, then...
I didn't realize that the toe plate and toe link on the CanAm X3 above took much of the wheel torque. They are running tires up to 33" with the extra weight of tire balls. They can instantly stop and recede when hitting any rock, etc. As a result, the aftermarket is making sturdier hubs and toe...
"Shortening of the outside wheel track." Thanks for bring this up.
New, very expensive center sections ($20-30k), place series 30 and 934 size CV's back to back. A bull or ring gear rotate around those. Most common is about a 5-7" CV separation for Arm-to-frame strength, camber geometry, and...
"Surely it would be preferable to keep the tyre upright and somehow reduce the massive migration of the outside wheel contact patch towards the front view CG? Can't help thinking a lightweight beam axle would do a better job."
Not in the OP's question, but a beam axle does do a better job...
Thanks. Great post for me.
The practical Camber/Caster bandwagon. Any ideas to make us think and measure is helpful. In my world with no testing facilities, it is real world of pictures and video.
This last weekend I showed a picture similar to the one above... to about 20 offroad racers...
Cibachrome: Apologies. Driven IFS is relatively new to offroad racing. There are a lot of builds with geometry that seem "too simple" with no camber or even caster gain. We are all learning, but I don't want to encourage the home builder to start just a $30-50k offroad IFS clip without...
I am not a student of suspension. I have browsed it to at least know what I don't know, and to try and understand what most are talking about. But, I see a ton of things in Video. Especially slow motion. It is then important to talk to the drivers, and show the video to get their feel. It seems...
Good example of both conditions. This is pretty common in the offroad community where fabrication may be more revered than geometry. 39"tire, 25 psi, 17" rim. This allows lots of tire to soak up rocks, etc at speed. Yes he went for a ride...
Here is a picture of one front IFS upright. Our first pass was a 1/4 scale printed part. That allowed me to re-design a little and to figure out how to hold the part for machining. Then I made a full size pressed wood part. We again made changes as I could break some areas. Then I got the 150lb...
The Can Am X3 has a solution to the Toe issue.
http://files.engineering.com/getfile.aspx?folder=f70723bc-a886-4bc7-aa7f-11959b6bd367&file=CanAmIRSToebar.jpg
Toeing the arm in definitely "fixes" the toe out issue through travel. The exact answer will probably have to happen in live testing. In a similar build in the 70's I did make the front adjustable by moving spacers but basically used that for initial alignment and have never moved them since...
Yes. I am pretty sure all you guys are generally right about toe out and darting. Thanks for the comments.
If you go by the links, they move inboard about 1" at full range. This would relate to a little over 1* toe out. But if you look at the tire contact patch, it intentionally stays along the...
Attached is the articulation drawing to find the virtual points inline with the half shaft and a very recent build by JIMCO Racing Inc. You can see where the lateral links are canted forward. Some UTV's have the links behind the rear end located very near the car centerline. Maybe missed, but to...
Reference Thread: thread800-419247
The referenced thread is fairly new and I have been working on an off-road IRS design that might bring some light to moving the Lotus lateral links.
It really helps to have a fresh paper design as you usually see more in the development of the geometry. To...
