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Author Topic:   How many deg in your 4 bar?
dirtracer14
Member
posted January 11, 2004 01:25 PM
What kind of angle are you guys using on a short arm 4 bar.. 15" center hiem to center hiem. what is the most you would go and the least? Thanks, Craig Moore


zeroracing
Member
posted January 11, 2004 06:45 PM
Just looking to see what is out there so i dont limit myself...anyone?


Mod57
Member
posted January 14, 2004 12:30 AM
I agree with Mod57. You may want to run your right upper bar up one hole from your left, but that's a driver's feel thing. Believe it or not, once you get the bars where you feel comfortable, you won't adjust them. You can make most adjustments with the pull bar, j-bar, and wheel offsets to get the desired results. That's just my experience.


dirtracer14
Member
posted January 14, 2004 08:22 PM
Well i made up a bracket but i set it up with the axle center on the top and bottom holes with both bars level then went up from there with a max of 20 deg uphill....is that enough or should i try for more? The rr is a long wishbone that im leaving...kinda like the rr was just looking for a bit diff on the lr...it has z link mounts and wish bone mounts right now on the lr but i want to add the 4bar....


dirtracer14
Member
posted January 17, 2004 10:02 PM
Should you keep the lower and upper bar at the same angle on the lr?


zeroracing
Member
posted January 17, 2004 10:17 PM
4 bar/z link chassis I finished up for customer is a 14" lower and a 16" upper and on the bottom with a 5 hole bracket we can go from -5 to almost + 15 deg and a 5 hole bracket on the upper and we can get almost 25-30 deg angle out of it.


ford5
Member
posted January 18, 2004 06:12 AM
14, whatever you do, make sure your birdcage is perpendicular to the world, before you set any angles. this is with your chassis fully loaded and frame heights set where you are going to run them. otherwise everything is changed when you actually go racing. always keep your birdcages indexed correctly. hope this helps ya...ford5


dirtracer14
Member
posted January 18, 2004 07:14 PM
Yes it is helping a ton...the first mount i made it parallel with the birdcage...without looking at the car...when i checked the cage is about a 20 deg lay back so my straight up bracket wont work. I was going to make both bar the same lengh but it sounds like the upper will be longer than the bottom? I am also helping a buddy setup a 4bar on the lr and he built the chassis for 18" bars but after setting the rear in today it looks like the upper will be shorter? Is there a rule of thumb for one being longer than others or is it what will fit? thanks guys for the help here i kinda know what i want just looking for info on places were i could mess it up!

Ford5 I will make sure the cage is indexed I found out it wont take much to get it all out of wack....the other car is still on the jig with the rear set at what will be ride height....i should get my car in the shop this week.....then the questions will really be coming lol

[This message has been edited by dirtracer14 (edited January 18, 2004).]

zeroracing
Member
posted January 18, 2004 07:23 PM
The rule of thumb is the lower bar is 2" shorter than the upper bar.
My bars on my old car used a 13 and 15" trailing arms. New car uses 9 and 11" trailing arms.
If you need to push the lower mounting bracket closer to the rear end build a extention or plug.
Word of caution, if you put to much angle in the upper and lower bar, you can run the driveline into the back of the tranny.


dirtracer14
Member
posted January 21, 2004 05:42 PM
Ok how long are your bars on the 4 bar side? What do you do with your spring? I can only get a 12" for a upper so i will have to put a 10" lower.....that brings it pretty far out there? thanks,


dqr-7
Member
posted January 21, 2004 09:45 PM
I run the spring on a slider mounted to the rear of the birdcage. Some run the spring in the front of the axle mounted to a clamp bracket. This is on the LR suspension.
On the z-link side I plan to run it on top of the axle or on the front of the birdcage.


nolimit92
Member
posted January 27, 2004 06:51 PM
Ok with all that said does anyone have a good basic scale sheet for the 4 bar Z link they wouldnt mind sharing? We are going to be racing a 4 link, Z link car for the first time, and would appreciate any help we can get. Our car will be around 2525 race ready (with driver).

Thanks In Advance!!!

Mike

CUSTOMPERFORMANCE
Member
posted January 27, 2004 10:43 PM
Hi Mike glad to see you here. Good luck with the new Black Diamond Chassis.


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