Darting only on right sweeper turns - Team Camaro Tech
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Brakes, Suspension & Steering Conversion questions, Steering & Handling

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  #1  
Old Apr 24th, 12, 05:41 PM
Fathom Green Fathom Green is offline

Eric
 
Join Date: Apr 2012
Location: Orange County
Posts: 8
Default Darting only on right sweeper turns

Hello,
I have 69 Camaro with that I have done much work to:
CPP front control arms
CPP front lowering springs
Bilstien shocks
Bump steer tie rod ends
Hotchkis rear lowering leaf springs
Welded custom made subframe connectors
350 engine with thumper cam, edelbrock performer heads, roller rockers, intake, headers, holley. Sounds like Nascar.
New power steering to replace old manuel box
New True track diff with 4:10 gears
New Tremec 5 speed.
17" wheels from PS Engineering.

The issue with the car is that after multiple alignments it still darts on right sweeper turns. It always retirns to center but it darts and feels like the up and down motion of the road is transferred to a side to side motion in the seat of my pants and the passenger. Left turns are beautiful with no abnormal motion. It almost feels like it tracks every groove or undulation on the road only on right turns that are sweepers.

Any ideas for a cure would be appreciated.

Thanks, Eric
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  #2  
Old Apr 24th, 12, 05:59 PM
allanjs allanjs is offline
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Al
 
Join Date: Jun 2007
Location: Iowa
Posts: 1,373
Default Re: Darting only on right sweeper turns

Eric, My first guess would be a problem with a belt or belts in the left front tire.
Switch the left with the right and try it. Second guess is possibly a bad spot in
the steering gear. That is assuming all other front suspension parts are tight.
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  #3  
Old Apr 24th, 12, 08:19 PM
Fathom Green Fathom Green is offline

Eric
 
Join Date: Apr 2012
Location: Orange County
Posts: 8
Default Re: Darting only on right sweeper turns

Hi Al,

Thanks for the info. The suspension is tight and new and I have switched tires.

You may be on to something with the steering.

Will check..
Thank You,

Eric
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  #4  
Old Apr 25th, 12, 07:37 PM
ern ern is offline
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ern
 
Join Date: Jan 2010
Location: nova scotia canada
Posts: 164
Default Re: Darting only on right sweeper turns

hi eric it is called tramlining, i have the same issue only mine does it both ways.i assume you have wide front tires,they say n camber makes it worse,i am off to the alignment store but would like to know your specs. they some more toe-in helps,abd some say a different type of tire and lower air pressure helps. if you fix it please let me know ,
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  #5  
Old Apr 25th, 12, 08:47 PM
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ROBS6T8 ROBS6T8 is offline
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Robert
 
Join Date: Mar 2005
Location: Templeton, Ca USA
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Default Re: Darting only on right sweeper turns

Ern, what LCA's are you running? I'm assumming the pic you have of the suspension is not complete. The adjusters are not tightened and the sway bar is just hanging there!
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  #6  
Old Apr 26th, 12, 08:05 AM
bills69 bills69 is offline
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Join Date: May 2004
Location: connecticut
Posts: 428
Default Re: Darting only on right sweeper turns

going through the same problem
rebuilt front end still the same
the posi rear is the next culprit
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  #7  
Old Apr 26th, 12, 05:23 PM
ern ern is offline
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ern
 
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Default Re: Darting only on right sweeper turns

eric do you have the alignment specs ,mine does the same only both ways
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  #8  
Old Apr 26th, 12, 05:29 PM
ern ern is offline
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ern
 
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Default Re: Darting only on right sweeper turns

robert they are right stuff control arms, nice piece fit very well had them painted, and yes the pictures were from a month ago all is together but i did find that the idler arm was new but so tight the it would not let the steering work so i replaced it works better but still strange feelin. any thoughts on specs would be great
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  #9  
Old Apr 26th, 12, 08:37 PM
Fathom Green Fathom Green is offline

Eric
 
Join Date: Apr 2012
Location: Orange County
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Default Re: Darting only on right sweeper turns

Men,

I will get specs and post.
My rear diff is out right now.
Maybe rear is stepping out due to diff.
Thank You, Eric
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  #10  
Old Apr 26th, 12, 08:39 PM
Fathom Green Fathom Green is offline

Eric
 
Join Date: Apr 2012
Location: Orange County
Posts: 8
Default Re: Darting only on right sweeper turns

Hi Ern,

Maybe you are on to something with the negative camber.
Thanks .
Again I will advise specs.
Eric
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  #11  
Old Apr 26th, 12, 08:47 PM
Steiner Steiner is offline
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Steiner
 
Join Date: Mar 2009
Location: Lyman, SC
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Default Re: Darting only on right sweeper turns

Ern, it's probably just my eyeballs but from that angle your pitman arm looks like a truck model. Does it have a bend in it so the center link end drops about an inch or so lower than the steering box output end? Also with your tires straight forward is the center link perfectly level and parallel with the crossmember?
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Dart 400 - AFR-195's - 224/224 HR - Powerjection III
TKO-600 - Moser 3.42 - Detroit Truetrac
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  #12  
Old Apr 26th, 12, 09:11 PM
Fathom Green Fathom Green is offline

Eric
 
Join Date: Apr 2012
Location: Orange County
Posts: 8
Lightbulb Re: Darting only on right sweeper turns

Ern,

The alignment specs are:
LEFT RIGHT
camber -1.2 - 1
caster 3.7 4.7
toe .18 .18
s.a.i. 10.2 9.8
incld angle 9.1 8.8

Any help regarding the tramlining would be appreciated.
problem is only on right turns. Crown in road moves and darts the car.
front wheels ar 8 x 17 with 245x45x17 rears are 9 x 17 with 275x 40x17.
Tires are Kuhmo Ectsa. Had same issue with the 15" Goodrich TA Radials.
Thank You
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  #13  
Old Apr 26th, 12, 09:16 PM
Steiner Steiner is offline
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Steiner
 
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Location: Lyman, SC
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Default Re: Darting only on right sweeper turns

I run these specs on my car with great results:
Camber: -0.5 L/R
Caster: 5.0 L, 5.5 R
Toe: 1/16"

They came both from Mark at SC&C (author of "How to Make Your Muscle Car Handle") and David Pozzi.
http://www.pozziracing.com/first_gen...lignment specs
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'69 Camaro X11 Street Car
Dart 400 - AFR-195's - 224/224 HR - Powerjection III
TKO-600 - Moser 3.42 - Detroit Truetrac
538 lb-ft - 500 hp
www.cmengines.com
'69 Camaro X44 Beater - SFT 327 - M20 - Moser 4.10
'02 Z/28 vert - stock
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  #14  
Old Apr 26th, 12, 09:19 PM
Fathom Green Fathom Green is offline

Eric
 
Join Date: Apr 2012
Location: Orange County
Posts: 8
Default Re: Darting only on right sweeper turns

Thank you Steiner.

I will re align and advise.

Much Appreciated!

Eric
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  #15  
Old Apr 27th, 12, 09:06 AM
yellow69RS's Avatar
yellow69RS yellow69RS is offline
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Jeff
 
Join Date: Jul 2007
Location: Aurora, IL
Posts: 4,090
Default Re: Darting only on right sweeper turns

I like Stiener's spec alot better than Eric's. I'm really not a fan of a difference between the sides in the camber. Camber is a tire wear angle and shouldn't be used to compensate for road crown IMHO. I'm not a fan of large amounts of camber either negative or positive. That 1.5 negative might be the ticket for autocross when every last bit helps but unnecessary on the street IMHO.

Jeff
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