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Author Topic:   General Setup Info for 4 Bar / Z-Link
rickbraley
Dirt Full Roller

Total posts: 58
posted July 26, 2004 04:11 PM  
What are the normal changes you all make to your setup to account for the track progressing from the start of the evening (moist & tacky) to the conditions normally seen later in the evening (dry & slick)??

Just trying to get a feel for what adjustments are most common, in what combinations they are made, etc...

This would be for a 4 bar / z-link car.

Thanks!

zeroracing
Dirt Forum Champ
Total posts: 1875
posted July 26, 2004 05:24 PM  
4 link z link car adjustment.
on tacky you may take some upper bar anlge out of the lr, and add some to the upper bar on the rr, this would be downward toward rear angle.
for dryslick, add lr upper bar angle, take angle out of the rr, increase lr spring.
thats what most cars adjust on them.


thesmoothshoe
Dirt Roller

Total posts: 15
posted July 26, 2004 05:44 PM  
I always hit a dry slick track with full fuel load and extra lead bolted on to get my rear% to 59-60%. I usually **** my right rear wheel in tighter. Maybe a little less stagger in back. You'll not want to have any kind of glaze on your tires. I am on a 4/z setup and i love a slick track. The biggest adjustment to make is in the driver-gotta be smooth-you can't muscle the car. hope it helps

thesmoothshoe
Dirt Roller

Total posts: 15
posted July 26, 2004 05:51 PM  
Not sure why the censoring for the word s-u-c-k, but i meant move the rr in an inch, sometimes 2.

hamer36
Dirt Maniac

Total posts: 196
posted July 26, 2004 08:11 PM  
What is wrong if the car goes into a 4 wheel slide when entering the corner? Does a guy need more RR spring to plant that tire or less RR spring to roll the weight off of the LR? THX for any ideas.

thesmoothshoe
Dirt Roller

Total posts: 15
posted July 26, 2004 09:01 PM  
hamer36-what exactly is your car doing? how big is the track? not sure about that yet, but how old are your tires? what kind of car\setup?

oh yeah rick, another thing to try might be to move your panhard down at the pinion or move it up at the frame a little at a time. be sure you adjust the bar length so you leave the rear end where it is. i don't do this often, but i have mine set where i like it for now. radical panhard changes can get you into trouble real quick, but that doesn't mean to be afraid to try things.

hamer36
Dirt Maniac

Total posts: 196
posted July 27, 2004 03:41 PM  
shoe
its a pierce. was real good last yr on the dry but we're missing something this year and can't find it. 750LF 600RF 200LR + 200RR 45# bite. 1/3 mile track

rickbraley
Dirt Full Roller

Total posts: 58
posted July 28, 2004 09:06 AM  
zeroracing, so basically you are just adding rear steer as the night progresses, right? What is the increase in the LR spring going to give you?

thesmoothshoe, where do you put the extra lead (right, center, left). On the panhard bar, I run a long one mounted behind the rear end. Would there be any advantage to running a J-Bar mounted on the pinion? I have heard different opinions on this. I know where it mounts to the rear end determines where the downforce is applied, correct? If this is true then wouldn't everyone want it mounted to the pinion where the force would be on both rear wheels? What angle to you get up to for dry/slick? Last of all, since the videos available elsewhere on this site clearly show the LR spring does nothing when the car is on the bars, how do you factor in cross% in the setup? Seems like the whole concept of cross gets pretty distorted in this scenario?? Wouldn't the cross only apply once the car comes off the bars for corner entry?

And thanks for the input; I might just learn something if I keep driving it in!!

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted July 28, 2004 09:24 AM  
even though you are on the bars and not the spring on the LR cross still comes into play because you are jacking the car between the LR and RF. More static cross on the scales will still give you more cross on the bars because you are wedging on the bars and the RF spring. Hope that made sense....

zeroracing
Dirt Forum Champ
Total posts: 1875
posted July 28, 2004 11:16 AM  
the bar angel changes are not for rear steer purposes, it is for thrust angle increase or decease. as the track drys out more lr thrust and less rr thrust.
as far as lr spring, when the wieght goes to the back of the car, transfers, the heavier lr spring will accept mroe than the softer one, so that means that if the lr is getting more the rr must be getting less, so that means long story short, more lr bite.
more lr drive tigthens car on the gas.

zeroracing
Dirt Forum Champ
Total posts: 1875
posted July 28, 2004 11:17 AM  
also as far as being on the bars, some of my 4 link set ups keeps the spring loaded all the time, even with the car hiked up till it goes over center. still loaded the spring.
but others just have the car on the bars.

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