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Author Topic:   How to stop a 4 bar DirtWorks from carrying the left front.
jkittleson
Dirt Roller

Total posts: 5
posted March 25, 2002 12:21 AM
Guys I need some help. I have a DW8 4-bar DirtWorks that carries the left front 1 foot off the ground. My springs are 750 LF, 700 RF, 250 LR, and 200 RR. I run a J-bar 2nd hole from bottom on the pinion and about 2 inches total rake. The car has 180 pounds LR. The left bottom arm is in the middle hole, left top bar in 3rd from bottom. The right bottom bar is in the bottom hole and the right top bar is in the 3rd from bottom hole. The track champion here has the same car and barely carries his left front. I have tried to reduce the LR weight in the car to calm it down, but the car is loose. What spring and/or arm changes should I make. Would a stiffer RR spring and more LR weight help? Should I swap my front springs or go to a stiffer RF? Any ideas would be great before I go back to my Z-link! =-)

[This message has been edited by jkittleson (edited March 25, 2002).]

Robcat
Dirt Roller

Total posts: 22
posted March 25, 2002 10:32 AM
I think I would start by switching the front springs. I have DW8 4-link LR, z-link right rear. I ran a all 4 link but found to much rear stear for my style. At the Super National last year we had the same problem. Andy "Great Guy" from Dirt Works had us soften the LR, that did the trick!

I think the left top bar should go up one hole! About 20 to 25 degrees at ride height!

DannyO
Dirt Roller

Total posts: 6
posted March 25, 2002 08:42 PM
Sounds like your rear rollcenter is way to low, its carring to much weight over to the right of the car. Increasing rollcenter or increasing the jbar angle will help to keep lf tire down. I bet your problem is worse on a tacky track. As the track dries out, I assume your problem isnt quite as bad

dluna
Dirt Full Roller

Total posts: 42
posted March 25, 2002 08:57 PM
DannyO,

I always thought that the less angle in the j-bar, the less weight transfer you would have from the left to the right. Possibly we are measuring our angles differently. From what I have heard, the more parallel you run the j-bar with the whole rear-end housing, the less transfer. Is this correct or am I thinking wrong. I am here to LEARN so please correct me. Thanks!!!

REARSTEER
Dirt Newbie

Total posts: 2
posted March 26, 2002 09:28 AM
I thought the more angle the easier it was to get the car to roll over.

dluna
Dirt Full Roller

Total posts: 42
posted March 26, 2002 10:19 AM
Yep,
That is what I was trying to say (I think). The less angle, the less weight transfer, giving you less roll. The greater the angle, the more weight transfer, giving you more roll.

~DON~

DannyO
Dirt Roller

Total posts: 6
posted March 31, 2002 06:44 PM
L

DannyO
Dirt Roller

Total posts: 6
posted March 31, 2002 06:57 PM
Lowering the roll center, creates more transfer of weight to the right
Raising panhard,j-bar angle= less rollcenter
Roll center is an imaganary line running from front to back of car. If you take a pig on a rotiserie, with a stick right thru the center of it to rotate it around a fire.the center of the stick can be a roll center. If roll center of pig is in center, pig will rotate around in a circle evenly. Now take that stick and lower it on the pig in the same way, just lower. Now when the pig starts to rotate this way, it wont be even anymore, more weight on the top. rotating downward, now it will go faster because more weight has been added to top area of roll center.It will go faster now and takes more energy to get it bak to a center area. I hope this can explain a little, but I was just at a cookout, thinking of this as I watched a pig roast.....lol I can give you what chassis setups say in this area if you like Easy way to ..................Only my opinion

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