Visit The Dirt Forum for More Information

Author Topic:   4 link push
owk
Dirt Newbie

Total posts: 2
posted April 30, 2005 09:08 AM  
I have a floated 4 link that has a bad push
in the middle of the turn under acceleration. The left rear is clamped in front of the rearend the right rear floated. Spring rates LF 650 RF750 LR225 RR175. I had a 200# spring in the right rear and changed it to a 175# to soften up the right rear but still just getting about 1" of right rear shock travel nothing seems to be bound up running a 30/30 right rear shock and a j-bar with about 2" higher on the frame than the center on the pinion.Any suggestions would be appericiated. Thanks

Ego Racing
Dirt Forum Champ
Total posts: 724
posted April 30, 2005 10:10 AM  
Drop your top left bar one hole on the frame and try it. If you raise the J bar on the frame and pinion it will lower the roll center and make it easyer for the car to roll over on the right rear.

nvracer
Dirt Maniac

Total posts: 127
posted April 30, 2005 12:36 PM  
Like EGO said, Lower the LR Upper line will remove bite on the LR reducing the push.
Some of the things that can cause this,
Not enough stagger, roller center to low(J-bar to low), To much LR bite, not enough rollsteer.
How is the car on entry and though the corner, before you pickup the trottle.
About the RR shock travel, If the shock is mounted on the birdcage in the front. It isn't a true reading of total travel because of the birdcage indexing as is rolls over.
My thought is if the car doesn't want to spinout then it is rolling over enough.

GRTWallbanger
Dirt Maniac

Total posts: 196
posted April 30, 2005 01:01 PM  
I think by changing the RR from a 200 to 175 you are making the throttle push worse?

owk
Dirt Newbie

Total posts: 2
posted April 30, 2005 02:05 PM  
I was running about 1/2" rear staggar and about 11/2" staggar in the front. The RR shock is on the rear of the birdcage.The push was actually worse this week after lowering the RR spring rate.I just can't figure out why there is no body roll. The bars on the left side are bottom bar is level the upper bar is 12 degrees.The LR bite is 35# and the car is pretty good going in until you pick up the throttle. Thanks

showtime13
Dirt Full Roller

Total posts: 60
posted May 01, 2005 07:20 AM  
quote:
Originally posted by owk:
I have a floated 4 link that has a bad push
in the middle of the turn under acceleration. The left rear is clamped in front of the rearend the right rear floated. Spring rates LF 650 RF750 LR225 RR175. I had a 200# spring in the right rear and changed it to a 175# to soften up the right rear but still just getting about 1" of right rear shock travel nothing seems to be bound up running a 30/30 right rear shock and a j-bar with about 2" higher on the frame than the center on the pinion.Any suggestions would be appericiated. Thanks

My car was like that a couple of years ago and found out that the front clip was bent. We reclipped it and had no problem since.

flyin353
Dirt Full Roller

Total posts: 49
posted May 01, 2005 07:36 AM  
I agree with a couple guys on here about your spring rates. Too high on LR, too soft on RR. The heavier spring gets the weight transfer. You could also try a softer RF. I run 225's across the back but I'm also on the bird cages, both sides. Sound like you have a ton of LR bite, you sure you only have 35# LR? Also, check your wheelbase. If you are just right or a little tight going in, you could adjust your rightside WB. This would also help turn in the center as the car rocks up on the LS and rolls over to the right, pushing the RR back creating roll steer.

Your in a good spot though, it's much easier to free the car rather than chase a bad loose condition.

rpm20
Dirt Freak

Total posts: 338
posted May 02, 2005 05:45 AM  
most of us have been told to run rear percentages at about 58 and if you go less rear percent then under throttle it will be looser, also sometimes i induce this myself by trying to power through the corner and picking up the loud pedal too soon.
maybe your picking it up too soon ???

in the heat of battle its easier said...than done.

jdj9410
Dirt Full Roller

Total posts: 65
posted May 03, 2005 07:02 AM  
When I had this problem it was a combination of things. One was my weight. At 350 pds ended up having to put lead at the right front to get some weight there so it could grip. The RF was 280 pds lighter than left even after shifting everything in car to the left (Dieting and an 80 pd loss has helped that a lot). Also ended up dropping the left upper bar a hole and raised the bottom bar up to 7 degrees to take some LR out on throttle and increase roll steer. Before that had the right upper bar close to 25 degrees to get the car to turn. It worked, but getting one to turn up on the bars like that was precarious and inconsistent. After getting the weight where it needed to be, it was loose from the center off. Lowered the top right back to 17 degrees and now can hammer it from middle off. A concept that helped me on a 4 bar was breaking it into 2 different setups. One going in, off the gas (springs etc.) and one getting through and out, on the gas (bars). That creates two static setups that work together to create a dynamic setup. Thinking of it that way has made it much easier.

Back to the Archives