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Author Topic:   4-bar questions???
FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted September 23, 2004 06:29 PM  
I have a 4 bar LR 3 bar RR. What I'm wondering is this, I have heard of putting a 90-10 shock on the LR to help it stay up on the bars. Has anyone here actually run this, and if so what did it make the car do on entry middle and exit?? I was thinking about trying it but I figured I get some input first. My car is close on handling just looking for that never ending edge on the competition LOL!!!

2nd2none
Dirt Forum Champ
Total posts: 755
posted September 24, 2004 12:08 AM  
just for clarification, you know to not use a 90/10 off the top of the rearend?

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted September 24, 2004 12:10 AM  
yeah of course, I mean replacing the LR shock with a 90-10.

dirtracr
Dirt Maniac

Total posts: 199
posted September 24, 2004 07:01 AM  
we used an 8-1 earlier this year..i took it off though...i used it in conjunction with a softer rf than lf spring..can't really say it helped but i may have had to do some adjusting with it to make it work..our track is so competitive(about 10 different winners this year) that i only messed with it for one night...go ahead and try it, it won't put you out in left field, see what you think, if you get it to make you a rocketship, post what you did for us dummies..good luck..

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted September 24, 2004 05:52 PM  
I belive I will try it but the bad thing as far as sharing my info with you guys is that I'm done for the year so it will be next year before I know something but I will definitley tell you all about it. My track is racing this weekend for the last time but I will not be able to make it, last weekend I had to shut it down because I lost oil pressure so its time for a rebuild anyway. I have some friends that race but none on 4-bars that would try it LOL. I'll let you guys know what I find.

Later,
Dale

norightturn
Dirt Maniac

Total posts: 159
posted September 25, 2004 06:39 AM  
It helped me with the 4 bar early
in the season. Car was easier to keep up on the bars. After I got better in the car I quit using it. Seemed like it hurt more then helped. It was a 7/3.

Xtrem4U
Dirt Maniac

Total posts: 144
posted September 26, 2004 10:05 AM  
I'm using a 90/10, on my 4 bar? What's it suppose to have? Please explain in detail?

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted September 27, 2004 05:43 PM  
xtrem, I think the 90-10 you are talking about is the one over the top of the rear end. Thats the brake dampener.I'm talking about the LR shock. The shock over the rear end should be a 90-10, yes. It helps reduce wheel hop under braking conditions and helps tighten the chassis on corner entry. What I was asking about was the LR wheel shock. Hope your not confused??????

WPP
Dirt Freak

Total posts: 451
posted October 10, 2004 07:15 AM  
FLYN do you mind shareing your 4-bar 2-link setup i would like to try it how much angle do you run on the two link side is your spring on top of the rear how is it on dryslick spring rates pullbar thanks

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted October 11, 2004 08:10 AM  
I dont knwo if I would use a 90/10. That might be a little severe. Try a 96-3 or 97-3 first or maybe even a 96-2.

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted October 11, 2004 05:02 PM  
WPP I have been running this setup for about 10 or so races, I don't have it perfected (I don't think we ever do!!)But heres what I've got. My car is a "metric" frame, springs: RF-800 LF-750 LR-200 RR-175. My car has 4 bar birdcages on both sides still, I just bought the lock out bracket for it and locked out the RR cage. The RR spring is on a coil-over eliminator on the birdcage in front of the rearend. I have a AFCO progressive spring pull bar, 20 degrees of angle offset 1" to LR. I'm not sure about the RR bar angle I'll check it for you. But I know its not got enough adjustment. This winter I will be building a plug for both the LR and RR lower bars. I also run a 14" straight bar in front of the rearend.(shorty bar).

Dman
Dirt Freak

Total posts: 270
posted October 12, 2004 07:44 AM  
The idea behind the 8/3 shock on the LR is to keep the car from dropping quickly and un-loading the car when you get off the throttle which can cause a loose entry problem. I would not use a 9010 because it will allow the left rear to lift to quickly and do the slide hammer deal to the left rear.The 4-bar latemodels "in the know" have been doing this for a while especially if they are doing the three legged dog deal.
Un-fortunately no one is making an in-expensive 9 in. 8/3 shock that I am aware of.
You have to have it built. Dman

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted October 12, 2004 08:15 AM  
Dman is right. WE started playing with LR shocks to help keep the car from crashing down. You can get a 95-3 shock pretty easily off the shelf. Beyond that you prob have to have them custom built. WE ran a straight 94, then a 95-3, for a long time. Last race of the year we tried a AFCO 8-3 and felt like the 8 was too much so we went to a 6-2, and it worked pretty well. Would like to try a 6-3 or 7-3 if we had time but it is the end of the season now and will prob have to wait til next year.

GRTWallbanger
Dirt Maniac

Total posts: 196
posted October 12, 2004 08:51 AM  
FLYN???????????????
Is your LR spring behind the rear-end?Or clamped in front ?
We run a 4 bar and I am thinking of clamping the RR and taking the upper bar off to make it a 2-link,(the car gets no shock travel on the RR) but I am not sure what to do with the LR?Either leave it behind on the birdcage or clamp it up in front ?
Also thinking about using a pull bar instead of lift bar, esp/ if I go LR clamped in front.
What ya all think???

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted October 12, 2004 04:12 PM  
My LR spring is behind the axle. Haven't tried the clamped spring up front yet. Don't know if I will. Try yours on the cage in behind first. This setup will definetly give you some shock travel on the RR, it sure did mine. As far as a pull bar or lift arm......I've ran both and I HATE the lift arm(maybe because at the time I was using it I wasn't very educated in dirt racing, not that I am now LOL!!!) I run the pull bar and have pretty good luck with it. I guess its just driver preference.

GRTWallbanger
Dirt Maniac

Total posts: 196
posted October 12, 2004 06:13 PM  
Do you run the right lower arm level?Mine was up hill 5* with the 4 bar?Also my lowers are 15inchs.Are you going shorter?

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted October 12, 2004 07:53 PM  
My RR lower arm is at 5 degrees uphill and its 15" center to center. Over the winter I'm going to build plugs for both lower links and shorten them. Also I only have 2 adjusting holes on the lower links right now, level and 5 deg. up. So the plugs will give me more adjustment.

topnotch
Dirt Full Roller

Total posts: 30
posted October 21, 2004 05:55 PM  
hey 2ndtonone,
early in the post you said to not run a 90/10 on top of the rear end with this setup. It sounds like you are referring to the damper shock. i guess i don't understand that. now i run a 6/2. with a three link. does the 2link RR, 4link LR require no brake damper shock?

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