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Author Topic:   RR Zlink or 4 Bar???
#13 mod
Dirt Full Roller

Total posts: 72
posted February 22, 2005 04:28 PM  
I'm thinking of switch the RR from swing arm Zlink to 4Bar. What would be the pro's and con's involved in doing this? Also what would be the basic setup for the RR 4Bar?

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted February 22, 2005 05:27 PM  
Pro's: with the 4-bar you'll get more roll steer.

Con's: with the 4-bar you'll get more roll steer.

LOL! I couldn't help it, I had to!

You can tune the chassis with the roll steer. It adds another adjustment. Myself, I have a 4-bar but I like it better with the RR on a 3-link type and the LR 4-bar. Its pretty much a driver preference deal. Its all about what feels comfortable to you. If you put the RR on a 4-bar then I would start with about 5 degrees uphill angle on the lower bar and on the top I never have checked the degrees, mine is in the center hole. 1 Hole lower than the LR upper link. My springs are 200LR 175RR and 94 shocks across the back.

Hope that helps some. Maybe someone has a degree for the top link.

#13 mod
Dirt Full Roller

Total posts: 72
posted February 22, 2005 06:33 PM  
Thanks, I just can't get it out of my head that there has to be something more to a modified these days that 4bar/Zlink. If you look at late models in the last year or so they've gone away from the 4bar/Zlink setup and gone back to swing arms or a 4 link. Also the left front tires are on the ground and not a foot or two off the track. Just something that I've been thinking about for awhile.

Any comments??????

zeroracing
Dirt Forum Champ
Total posts: 1875
posted February 22, 2005 06:41 PM  
the late models also run giant tires, and torque arms all thetime. but a 4 link will work great on the rr.
go like 12 lower 15 upper
15 deg in upper and lower level to start
spring in front on bc like 200 rate to start.

#13 mod
Dirt Full Roller

Total posts: 72
posted February 22, 2005 06:50 PM  
Will the left rear spring rate need to be changed much to start? We have LR275 behind BC and RR225 on the swing arm. I guess what I'm asking is a 275 to much for the LR on a 4link?

donslink1
Dirt Freak

Total posts: 318
posted February 22, 2005 07:00 PM  
We ran our car as a 4-bar on the right side,
yes you get more steer.
It works real good on a real dry smooth track. As the car rolls, a z-link gains axle thrust, which will free the car up.
now a 4-link will lose axle thrust and tighten the car up.
If you are going to run a 4-link on the right side, i would run the spring on top of the rear end not clamped in front or behind on the birdcage you get to much indexing and it gets a lot more complex.
A lot harder to figure out.

sdracer12
Dirt Maniac

Total posts: 180
posted February 22, 2005 10:47 PM  
I've run 250# LR, 200# RR springs with the 4-bar. I also have run 200# LR with a 175# RR spring. Both have worked fine. My 4-bar car is spring behind on the LR, spring in front on the RR. Both springs on sliders, on the birdcages.

A 275# spring sounds a little heavy for your LR, but if it works for you, great, lol.

What rate are your front springs?

#13 mod
Dirt Full Roller

Total posts: 72
posted February 23, 2005 04:25 AM  
700 LF 750 RF. Like I said it seems to work ok for us, just looking for something better....
Thanks for the info.

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