LEGENDS > Drivetrain & Gearing
What Pinion Angle are you running?
DARK AGE 53:
--- Quote from: admin on May 22, 2007, 06:49:42 pm ---Al, it is important that you check the squareness of rear end when you change the third link length. You have to get the angle right AND get the axle square. That is often a tricky thing .
--- End quote ---
Tom, Why would adjusting the upper rear link affect the axle squareness , I could see if you adjusted one of the trailing arms it could affect the squareness of the axle. Thanks.
justfreaky:
Hi Tom,
The front mounting bracket has several different holes, so can be adjusted up or down. This is on a Dwarf, with a solid top link. I wasn't sure if the Legends ran the same set up. I was looking at the pic on www.littleracecars.com. Looked like similar set up as mine.
Sounds like your set up works slightly different. I would think that the principle is the same, moving the pinion angle either up or down.
I'd like to get a better look at the Legends Car suspention, both front and rear. Unfortunately, up here in Montana, I don't get to see many Dwarfs or Legends Cars. The few Dwarf Cars I've seen here use very crude leaf springs in the rear. Probably not legal anywhere. I heard that they race Legends Cars in Kalispell, but that's a 4 hour drive from where I live. I started building my car when I lived in Nebraska. What I'll most likely do is run SCCA autocross. Not too many options for me right now, unless I can get the local track interested.
I do appreciate this forum; as I get some great ideas, as I continue my build. I try to share what I can. If it helps Great! If not, Sorry! Don't want to upset anyone.
Best of luck to all this season.
Steve
DARK AGE 53:
Hey Steve,
I'll take a bunch of pics today of the front and rear suspentions and e-mail them to you later.
Al
justfreaky:
Al,
Thanks for the pics. !!!
I'm guessing Tom is using a rubber torque link. My set up is similar to yours except for the front mount has multiple mounting holes. Either way, as you shorten the link, the pinion angle moves downward and the rear of the link move upward. The rubber doughnut would allow the angle to change slightly during acceleration and brakeing.
I do have one of those rubber torque links also. Do you think it is the better compromise between acceleration and brakeing? Sounds reasonable.
Curious,
Steve
Tom Cole:
I'm not exactly sure why, but I measured it, so I know it is happens.
Here is my explanation. May be right, may be wrong.
As you alter the third link length, it twists the axle housing, which changes the angle of the radius rod bracket on the bottom of the axle to lean toward, or away from the radius rod lollypop on the chassis. That changes the distance between the centerline of the axle and the lollypop. If you have different radius rod lengths or angles to begin with, it will effect each side a little differently. It is the same as changing radius rod lengths. When you change them, you are changing the arc of travel and effecting the rear steer of the car. I am VERY particular about knowing the squareness of my car's rear end.
How much or how little these things will change and the magnitude of their effect is something that I do not know how to calculate. I probably could if I really wanted to, but I'm still dealing with bigger fish with respect to setup. I do know, however, that my son can tell when I change the RR radius rod length by as little as 1/2 of a turn. You can see it on the clock and you hear about it when he comes off.
Thanks for the explanation Steve. Your info and insight has me questioning things, and that is what I need. I'm not going to learn a darn thing doing everything the same way over and over.
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