Re: Wheels up launch, adjustment question
[Re: WheelsUp73]
#2040006
03/27/16 09:21 PM
03/27/16 09:21 PM
|
Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
|
I Win
Joined: Jan 2003
Posts: 32,394
|
Try a quarter turn of pre-load, right side Don. First off get a set of scales and scale the car before you touch anything. More than likely you are light on the right rear side of the car causing the slight body roll and driving right.Once the rear is set properly it will leave straight and pick up both wheels evenly. You Dont need an anti rollbar. just about everyone would benefit from an anti-roll
|
|
|
Re: Wheels up launch, adjustment question
[Re: Quicktree]
#2040022
03/27/16 09:42 PM
03/27/16 09:42 PM
|
Joined: Sep 2011
Posts: 369 California, USA!!!
WheelsUp73
enthusiast
|
enthusiast
Joined: Sep 2011
Posts: 369
California, USA!!!
|
Try a quarter turn of pre-load, right side Don. First off get a set of scales and scale the car before you touch anything. More than likely you are light on the right rear side of the car causing the slight body roll and driving right.Once the rear is set properly it will leave straight and pick up both wheels evenly. You Dont need an anti rollbar. just about everyone would benefit from an anti-roll I dont agree. Set up the chassis right and it will not be needed.
|
|
|
Re: Wheels up launch, adjustment question
[Re: WheelsUp73]
#2040023
03/27/16 09:46 PM
03/27/16 09:46 PM
|
Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Try a quarter turn of pre-load, right side Don. First off get a set of scales and scale the car before you touch anything. More than likely you are light on the right rear side of the car causing the slight body roll and driving right.Once the rear is set properly it will leave straight and pick up both wheels evenly. You Dont need an anti rollbar. just about everyone would benefit from an anti-roll I dont agree. Set up the chassis right and it will not be needed. I assume you dont put them on 4 links either
|
|
|
Re: Wheels up launch, adjustment question
[Re: Jeepmon]
#2040035
03/27/16 10:07 PM
03/27/16 10:07 PM
|
Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Go ahead and add some pre load.. thats a quick and easy try.. it will help it from turning right.. but IMO it wont correct the roll onto the RR tire.. but try the pre load and get back later
|
|
|
Re: Wheels up launch, adjustment question
[Re: WheelsUp73]
#2040102
03/27/16 11:23 PM
03/27/16 11:23 PM
|
Joined: Dec 2005
Posts: 11,570 Fulton County, PA
CMcAllister
Mr. Helpful
|
Mr. Helpful
Joined: Dec 2005
Posts: 11,570
Fulton County, PA
|
Try a quarter turn of pre-load, right side Don. First off get a set of scales and scale the car before you touch anything. More than likely you are light on the right rear side of the car causing the slight body roll and driving right.Once the rear is set properly it will leave straight and pick up both wheels evenly. You Dont need an anti rollbar. just about everyone would benefit from an anti-roll I dont agree. Set up the chassis right and it will not be needed. I used to think that when they were first starting to show up and were considered exotic. Now, I wouldn't put one together without it. Another tuning tool in the toolbox. And I agree on the scales. If you don't know where the weight is, you're guessing with your eyes closed. Bad springs and broken parts will show up on the scales. At a minimum, use the scales to verify that stuff is OK and baseline the car. Then go to the track and it will tell you what it wants.
Last edited by CMcAllister; 03/27/16 11:34 PM.
If the results don't match the theory, change the theory.
|
|
|
Re: Wheels up launch, adjustment question
[Re: Jeepmon]
#2040138
03/28/16 12:10 AM
03/28/16 12:10 AM
|
Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
This is recordings of the car before I did the coil over strut conversion.. Havent had the opportunity to scale it afterwards, but here is what I got..
LF 773 RF 843 LR 687 RR 683 TOTAL 2986
With Driver and fuel LF 853 RF 883 LR 814 RR 684 TOTAL 3234
Did you change the back at at.. did you measure the front(from the fender opening before and after) you changed things
|
|
|
Re: Wheels up launch, adjustment question
[Re: WheelsUp73]
#2040157
03/28/16 12:25 AM
03/28/16 12:25 AM
|
Joined: Jan 2003
Posts: 2,946 Windsor ,Ca.
Keith Richards
master
|
master
Joined: Jan 2003
Posts: 2,946
Windsor ,Ca.
|
Try a quarter turn of pre-load, right side Don. First off get a set of scales and scale the car before you touch anything. More than likely you are light on the right rear side of the car causing the slight body roll and driving right.Once the rear is set properly it will leave straight and pick up both wheels evenly. You don't need an anti rollbar. just about everyone would benefit from an anti-roll I dont agree. Set up the chassis right and it will not be needed. I agree with Steve, my Challenger is ladder as well and when scaled and set up correctly leaves even, shouldn't need a anti-roll bar Don. One other thing is verify all the lock nuts on your ladders are tight and not allowing any twisting movement within themselves.
Last edited by Keith Richards; 03/28/16 12:42 AM.
|
|
|
Re: Wheels up launch, adjustment question
[Re: Jeepmon]
#2040163
03/28/16 12:31 AM
03/28/16 12:31 AM
|
Joined: Mar 2006
Posts: 9,836 MI, usa
dvw
master
|
master
Joined: Mar 2006
Posts: 9,836
MI, usa
|
This is recordings of the car before I did the coil over strut conversion.. Havent had the opportunity to scale it afterwards, but here is what I got..
LF 773 RF 843 LR 687 RR 683 TOTAL 2986
With Driver and fuel LF 853 RF 883 LR 814 RR 684 TOTAL 3234
I've tuned by adding preload/shock changes and using a scale. The final test may always need adjustment from the scale readings. If the weight is still in the range shown no wonder it goes right. The left rear is 130 lbs heavier than the right. It would benefit moving weight to the right. If that's not possible in my opinion it needs more than a 1/4 turn. I usually count the flats on the adjuster. My bet is it'll take 3-5. Start at 2 and work your way up. The ladder bar in itself works as an anti-roll bar unlike a 4 link. If there is very little flex it won't need one. All depends on how stiff the chassis, housing, and bars are. Mine is stock frame rail with no ARB with 3-4 flats of preload (every car is different). Dead level,1.25-1.27 foot brake. This picture tire is 13.5 psi Doug
|
|
|
Re: Wheels up launch, adjustment question
[Re: Keith Richards]
#2040183
03/28/16 12:55 AM
03/28/16 12:55 AM
|
Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Guys I KNOW a ladder bar acts like a anti roll and IF things flex the bar helps it.. my car was a ladder bar before I changed it.. my Rampage is a ladder bar... and Doug is right.. those weights are way off... the RR should show close to the other side and then add a bit off preload.. if you have a LOT of preload for the launch it does the exact opposite on the shut down.. thats why you dont want to add a lot... there are others on here that have added a bar and it helped big time... and I fought that idea.. but if you cant move weight.. then there is a problem EDIT JMO but I would see if I can move 150# to the RR and with that 20# you might not need any preload or you would be adding a small amount
Last edited by MR_P_BODY; 03/28/16 01:48 AM.
|
|
|
Re: Wheels up launch, adjustment question
[Re: Jeepmon]
#2040289
03/28/16 08:55 AM
03/28/16 08:55 AM
|
Joined: Jan 2005
Posts: 4,243 Charlotte, North Carolina
sgcuda
master
|
master
Joined: Jan 2005
Posts: 4,243
Charlotte, North Carolina
|
Anyone who runs roundy round could see that the cross weight is light. If this is a coil over suspension, just increase pressure L/F and R/R . That will decrease pressures on opposite cross weights at the same time.
[image][/image]
|
|
|
Re: Wheels up launch, adjustment question
[Re: sgcuda]
#2040377
03/28/16 01:00 PM
03/28/16 01:00 PM
|
Joined: Jan 2004
Posts: 8,270 fredericksburg,va
cudaman1969
master
|
master
Joined: Jan 2004
Posts: 8,270
fredericksburg,va
|
Anyone who runs roundy round could see that the cross weight is light. If this is a coil over suspension, just increase pressure L/F and R/R . That will decrease pressures on opposite cross weights at the same time. Just a reminder, when jacking weight around, especially on a ladder bar car, don't forget to remove one of the bar bolts at the housing, CANT JACK WEIGHT IF YOU DONT. Put something that is your weight in the seat (I used feed bags) then adjust weight. What the weights are before you're in the car means nothing. Driver side front should have more, back equal. When car launches that left front weight goes to right rear.
Last edited by cudaman1969; 03/28/16 02:52 PM.
|
|
|
Re: Wheels up launch, adjustment question
[Re: MR_P_BODY]
#2040400
03/28/16 01:52 PM
03/28/16 01:52 PM
|
Joined: Apr 2005
Posts: 1,505 TN
SCATPACK 1
pro stock
|
pro stock
Joined: Apr 2005
Posts: 1,505
TN
|
[/quote] He needs to put the anti roll on first then see about air.. its loading the RR harder due to twisting.. if it applies equal load to both tires it might be fine [/quote] So what size anti roll bar? Is it one size fits all for the diameter?
Old Geezer Racing
|
|
|
Re: Wheels up launch, adjustment question
[Re: Jeepmon]
#2040428
03/28/16 02:34 PM
03/28/16 02:34 PM
|
Joined: Dec 2005
Posts: 1,495 Shelby mi.
JAKE68
pro stock
|
pro stock
Joined: Dec 2005
Posts: 1,495
Shelby mi.
|
Would a anti roll bar be good to have ???Yes but it is not the end of the world. A ladder bar car could be set up to go straight without one. It really needs to be put on scales with driver weight in seat and set up with about 20-30 lbs heavier on right rear than lt. he is 130 lbs light on the rt rear that is why it is going rt. left tire is working harder and driving the car rt.
Last edited by JAKE68; 03/28/16 02:37 PM.
JAKES AUTOMOTIVE
|
|
|
Re: Wheels up launch, adjustment question
[Re: Jeepmon]
#2040446
03/28/16 02:56 PM
03/28/16 02:56 PM
|
Joined: Feb 2005
Posts: 20,174 PA.
pittsburghracer
"Little"John
|
"Little"John
Joined: Feb 2005
Posts: 20,174
PA.
|
Thanks everyone for your advice and suggestions..
I really didnt want to spend the money.. specially with TAXES due next month and all the other projects we have going on.. but I ordered a set of scales today and will re-weigh the car..
Thanks again all
Hey BUDDY. Can I borrow them. LOL
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
|
|
|
Re: Wheels up launch, adjustment question
[Re: Jeepmon]
#2040459
03/28/16 03:15 PM
03/28/16 03:15 PM
|
Joined: Jul 2010
Posts: 2,422 Pittsburgh PA
Eric
top fuel
|
top fuel
Joined: Jul 2010
Posts: 2,422
Pittsburgh PA
|
I put an anti-roll in the Arrow and it was well worth the expense. It's a 4-link car and extremely narrow. To much pre-load and you can risk the car wanting to drive left or right down track.
5.53 @ 125 1/8th on the launch control..more left in her!
|
|
|
|
|