Body roll on shut down..
#1528921
11/05/13 01:13 PM
11/05/13 01:13 PM
|
Joined: Nov 2006
Posts: 1,086 Baton Rouge, La.
StandOnIt
OP
super stock
|
OP
super stock
Joined: Nov 2006
Posts: 1,086
Baton Rouge, La.
|
I'm having a serious problem here. My son has been driving the car this season and has told me the car is "loose" in the shut down. I told him, "race cars are loose up there because of the slicks". I drove it this weekend and it liked to scared me to death. The rear of the car is rocking back and forth like the rear is trying to come around. Kinda like a dog wagging its tail. Its a 76 Volare w/ sb motor. Ladder bar coilover rear, hoosier light weight radial slicks with hoosier front runners. I did move the front toe "in" a little and my son said it helped a little but when I made a hit in it, I almost started screaming cause it got so loose with me. Is it the light weight radials? Rear coilovers going bad? I did just put a set of Calvert front shocks on it. Could the front be too soft? Somebody help me before me someone else gets hurt..lol
76' Volare, 5.9 magnum w/Iron heads. New best 10.68 at 123 mph 1/4 mile.
|
|
|
Re: Body roll on shut down..
[Re: StandOnIt]
#1528922
11/05/13 01:18 PM
11/05/13 01:18 PM
|
Joined: Aug 2007
Posts: 2,224 Arlington, Tx.
BJS racing
top fuel
|
top fuel
Joined: Aug 2007
Posts: 2,224
Arlington, Tx.
|
How much tire pressure are you running? You likely have the tire pressure to low.
Back in the swing of things at Painless again! Great to be back!
|
|
|
Re: Body roll on shut down..
[Re: StandOnIt]
#1528924
11/05/13 01:47 PM
11/05/13 01:47 PM
|
Joined: Aug 2007
Posts: 2,224 Arlington, Tx.
BJS racing
top fuel
|
top fuel
Joined: Aug 2007
Posts: 2,224
Arlington, Tx.
|
What tires are you running? What kind of track locator are you using on the car? diagnal or wish bone and does it have rod ends, urethane bushings, solid rod ends?
Last edited by BJS racing; 11/05/13 01:49 PM.
Back in the swing of things at Painless again! Great to be back!
|
|
|
Re: Body roll on shut down..
[Re: BJS racing]
#1528925
11/05/13 01:52 PM
11/05/13 01:52 PM
|
Joined: Aug 2007
Posts: 2,224 Arlington, Tx.
BJS racing
top fuel
|
top fuel
Joined: Aug 2007
Posts: 2,224
Arlington, Tx.
|
do you by chance have a picture of the ladder bar set up on your car? Sounds kinda like the rear suspension may be moving side to side like the locating device is loose or something may be failing. Has it done this all year or been getting worse?
Back in the swing of things at Painless again! Great to be back!
|
|
|
Re: Body roll on shut down..
[Re: BJS racing]
#1528926
11/05/13 02:06 PM
11/05/13 02:06 PM
|
Joined: Nov 2006
Posts: 1,086 Baton Rouge, La.
StandOnIt
OP
super stock
|
OP
super stock
Joined: Nov 2006
Posts: 1,086
Baton Rouge, La.
|
Quote:
do you by chance have a picture of the ladder bar set up on your car? Sounds kinda like the rear suspension may be moving side to side like the locating device is loose or something may be failing. Has it done this all year or been getting worse?
I drove it early this season and it didn't do all that. It had the regular radial slicks on it tho. It also didn't have the calverts on the front end either. I checked the locater bar and the ladder bars, rocked the car side to side and watched the rear susp for movement, nothing...
I should really park it for the rest of the season and completely rebuild the front susp and go thru it with a fine tooth comb but we have 2 races left and my son is sitting close to the top in points and could actually take track champion on his rookie year. I hate to have to take that from him because of a simple adjustment to the car...
Last edited by StandOnIt; 11/05/13 02:09 PM.
76' Volare, 5.9 magnum w/Iron heads. New best 10.68 at 123 mph 1/4 mile.
|
|
|
Re: Body roll on shut down..
[Re: StandOnIt]
#1528927
11/05/13 02:12 PM
11/05/13 02:12 PM
|
Joined: Feb 2003
Posts: 12,675 Columbia, CT
moper
I Live Here
|
I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
|
Does he need to counter-steer or does the back just wiggle? What sort of ET/MPH we talking here? What size wheel and tire package in the back?
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
|
|
|
Re: Body roll on shut down..
[Re: moper]
#1528930
11/05/13 02:20 PM
11/05/13 02:20 PM
|
Joined: Aug 2007
Posts: 2,224 Arlington, Tx.
BJS racing
top fuel
|
top fuel
Joined: Aug 2007
Posts: 2,224
Arlington, Tx.
|
Are you sure it is in the back of the car you are actually feeling it? Not control arm bushings or alignment that is bad. If it wasn't doing it at the begining of the year and it is now then something is wearing down or broken. I would jack the car up and unload the rear suspension and recheck the diagonal and rod ends on the ladder bars. Also is the diagonal held on by bolt in mounts that attach to the brackets or are they weld on mounts? If they are the bent bolt on type they may be shifting down track creating this problem.
Back in the swing of things at Painless again! Great to be back!
|
|
|
Re: Body roll on shut down..
[Re: StandOnIt]
#1528932
11/05/13 02:31 PM
11/05/13 02:31 PM
|
Joined: Aug 2007
Posts: 2,224 Arlington, Tx.
BJS racing
top fuel
|
top fuel
Joined: Aug 2007
Posts: 2,224
Arlington, Tx.
|
A radial willy typically have a stiffer sidewall than a bias drag slick so you should have less rock from the sidewalls with the tire you are running. you should also pull the bolts out on the locator and the front mounts to make sure that the bolt has been eating away at the brackets because the bolt is to short. If the hole is oblonged then that will cause exactly what you have going on. The "kit" ladder bar and 4 link systems typically have too short of bolts in them. The shoulder of the bolt should go all the way through both sides of the bracket and use washers to keep the nut from bottoming out on the bolt before everything is tight.
Back in the swing of things at Painless again! Great to be back!
|
|
|
Re: Body roll on shut down..
[Re: 540DUSTER]
#1528942
11/05/13 09:42 PM
11/05/13 09:42 PM
|
Joined: Feb 2011
Posts: 1,454 Glendora Ca.
Just-a-dart
pro stock
|
pro stock
Joined: Feb 2011
Posts: 1,454
Glendora Ca.
|
Quote:
measure the toe pattern of each wheel,sounds like a bump steer problem to me.
This could be it, and the stiffer (pre Calvert)front shocks were not letting the front dip down as fast when on the brakes.
Last edited by Just-a-dart; 11/06/13 02:13 AM.
"Just a Bracket car dressed up like a streetcar"
|
|
|
Re: Body roll on shut down..
[Re: dvw]
#1528944
11/06/13 06:33 PM
11/06/13 06:33 PM
|
Joined: Dec 2005
Posts: 293 Kansas City Metro
mbogina
enthusiast
|
enthusiast
Joined: Dec 2005
Posts: 293
Kansas City Metro
|
Many times a rear end "sashay" similar to this is actually a harmonic problem in the frequency of the suspension front to rear, often cured by stiffening the damping of the front shocks to kill or reduce the harmonic.
Be a Rebel- Break the Laws of Physics!
|
|
|
Re: Body roll on shut down..
[Re: mbogina]
#1528945
11/06/13 07:59 PM
11/06/13 07:59 PM
|
Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
master
|
master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
|
Is this happening only on decel? If so, what is the method of slowing the car? Does it happen without the brakes being applied? Does the engine induce significant engine braking? Do you have a spool or a locking style diff? Does the car still have a front stabilizer bar?
"use it 'till it breaks, replace as needed"
|
|
|
Re: Body roll on shut down..
[Re: plycuda]
#1528947
11/06/13 11:08 PM
11/06/13 11:08 PM
|
Joined: Jan 2003
Posts: 17,918 Akron, Ohio
ProSport
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 17,918
Akron, Ohio
|
I was watching the 8 second Hemi Cuda's at the finish line at Norwalk a few years ago and some of them were scary to watch as they would rock/roll side to side at speed and even more when they got on the brakes. And one of the Dart's looked like it was gonna roll over on it's roof when he slowly turned into his pit spot. Not sure why.
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
|
|
|
Re: Body roll on shut down..
[Re: ProSport]
#1528948
11/08/13 10:04 AM
11/08/13 10:04 AM
|
Joined: Nov 2006
Posts: 1,086 Baton Rouge, La.
StandOnIt
OP
super stock
|
OP
super stock
Joined: Nov 2006
Posts: 1,086
Baton Rouge, La.
|
Thanks for all the replies guys. The K member is solid mounted to body. The front wheels have no "slop" in them due to all new parts at the wheels, no front or rear sway bars. Steering box it tight to K member. It starts as soon as you lift off the gas and gets worse as the brakes are applied. I got it out of the trailer and inside in our warehouse on flat concrete. The diag link for the ladder bars have slop in it. The brackets ARE wore out. I am going to pull them and replace with longer bolts, recheck the rear susp then get out on the 4 lane hwy and make a little hit with it to see. I will post findings. Thanks everyone again.. You guys are the best!
76' Volare, 5.9 magnum w/Iron heads. New best 10.68 at 123 mph 1/4 mile.
|
|
|
|
|