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Author Topic:   Rear end Drift
driver27
Dirt Full Roller

Total posts: 40
posted May 20, 2002 08:53 AM
Does anyone have some suggestions on stopping rear end drift or skate on a swingarm z-link car? Ive been all over the place on rear springs and wedge, but the car does not respond to any adjustments. There are no binds in the rear suspension. Someone recently suggested that too much angle on a long pull bar would cause the rear end to unload during braking and deceleration, and this is what feels like is happening. Has anyone else had this kind of thing happen? I got to get the rear end planted during braking and corner entry before I can chase all the other handling problems. Any suggestions welcome.

Van

driver27
Dirt Full Roller

Total posts: 40
posted May 20, 2002 02:53 PM
Ok, this is sort of a followup on my own question. How many of you have found the need to run 2 dampener shocks on the rear end to control the rearend? What are the signs of a weakening dampener shock, other than obvious ease of movement in the compression direction? Lots of questions and very few answers on my part, thanks guys.

Van

CUSTOMPERFORMANCE
Dirt Freak

Total posts: 464
posted May 20, 2002 05:30 PM
i would take some angle out of the pullbar . try this first.

dirtracer14
Dirt Freak

Total posts: 333
posted May 20, 2002 08:34 PM UIN: 23443678
I have kinda the same rear setup. I can tell ya that i did away with the spring pullbar and went with a rubber bar to keep some of the travel down on the rearend, and run the 90/10 as straight as possible. the other thing that i have been working with is the panhard bar. Now again this is my car at a tacky track and may not work for ya. What is the track like when the car is skating?

driver27
Dirt Full Roller

Total posts: 40
posted May 21, 2002 06:57 AM
The track we race on is very hard and slick, always takes rubber (usually mostly from my right rear,,,haha). I checked the square on the rear end last week, and it was OK. I checked and it has 21 degrees of down angle on my pull bar, which is a long rubber bisquit type pull bar. I checked the dampener shock last night and it was stiff, but im thinking when those things are new you can barely push them in. This one was very stiff, but you could push it in with some effort. Anyways took about 3 - 4 degrees of pull bar angle out of it and added a mount for a second dampener shock. If in the heat it skates the rear, i'll hook the second shock up for the main. Still open for suggestions however, thanks guys.

Greggie
Dirt Full Roller

Total posts: 66
posted May 21, 2002 04:52 PM
I agree with CUSTOMPERF., I had the same deal and flattened the pull-bar and VOILA! No more squealing tire going into the corner. You could also increase the 90/10 angle and it would help, but not as much as changing the pull-bar.

Greggie

mod7
Dirt Roller

Total posts: 21
posted May 21, 2002 08:48 PM
I agree with Jammin. I had the same setup on my modified last two years and chased the same problem. Did exactly what Jammin said and it fixed it. With a z-link, you have to keep a check on stuff like that, because there are more things that can go wrong with suspensions like this and they affect handling a great deal. In my opinion the z-link and four bar are one of the best suspension set ups, but you just have to keep on top of the set up with good maintenance.

driver27
Dirt Full Roller

Total posts: 40
posted May 22, 2002 07:46 AM
Ok, looks like Jammin may win the prize. After further investigation, looks like the rear end may not be square. I dropped a plumb bob off of the front lower ball joint fittings and one off of the rear frame rails and the rear end housing and the right rear appears to be farther back (trailing?) by a good bit. Is this an accurate way of squaring the car? Can some one tell me a better way to square the rear end, im wanting to be sure this time, as Ive chased this car way too much the last year and a half. I really appreaciate everyone who has taken time to offer me advice, Thanks alot.

Van

devil wrench
Dirt Full Roller

Total posts: 51
posted May 22, 2002 06:05 PM
The RR trailing won't cause a car to skate at all. In fact, it will tend to keep the tires hooked by steering the car instead of sliding the rear tires. It will drive like a forklift though. We run as much as an inch of trail on the RR to free the car around the corner and still have a pile of forward bite.

The alignment of the rear axle won't make the car break loose and skate into the corner.

Try taking the 90/10 off. You might be amazed. On a slick track, you've got to let the car be free, not really bind it up like you would with a second 90/10.

[This message has been edited by devil wrench (edited May 22, 2002).]

jammin
Dirt Administrator

Total posts: 5060
posted May 22, 2002 09:59 PM UIN: 16262997
Sorry man, I can't read. Your angle on your pull bar like Custom said or the 90/10, you can put more angle in it or double it up and it should help the unloading issue. Sorry about that.


The skating I was referring to was off the turns. The rearend trailing will affect your exit.


jammin

[This message has been edited by jammin (edited May 22, 2002).]

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