After lowering car, rear end comes out when spinning tires - Ford Mustang Forum
 
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post #1 of 10 (permalink) Old 10-19-2013 Thread Starter
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After lowering car, rear end comes out when spinning tires

After lowering my car I noticed now when going WOT in 1st + 2nd the rear end likes to swing around the right... before the rear end would break loose but generally stay behind , but now it seems to favor swinging to the right. Eibach Sportlines, Whiteline LCA brackets, adjustable panhard bar.

Is this just a characteristic of the car or is something up? No wheel hop, no clunking noises, no funny suspension noises... just when the wheels light up the rear end comes swinging around.

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post #2 of 10 (permalink) Old 10-19-2013
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Have you checked your alignment? Make sure to have that checked/corrected after lowering your car.

Do you actually have Lower control arms? or Relocation brackets for the lower control arms. For instance if you lower your car you can get relocation brackets for your LCA's that will adjust the squat and help with traction .

Another option that would help with traction is a stronger adjustable Upper control arm.


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post #3 of 10 (permalink) Old 10-19-2013
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I lowered with Eibach pro springs and mine also goes to the right when getting silly. No other suspension work other then adjustable Panhard bar. Just keeps you on your toes when rearend kicks sideways lol

2011 Performance White 5.0 Premium 6spd MT, 3.73's, 401A
Mods: Staggered 18" FR500 wheels with 255 45 18, & 295 45 18 tires, Air Lift Drag Bags, Roush axle backs, Eibach Pro springs, BMR Adjustable Panhard bar, Center Fog grille, MMD Hood Struts,BAMA Tuned, JPC Line Lock, Blowfish Racing Bracket
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post #4 of 10 (permalink) Old 10-19-2013 Thread Starter
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I found my answer, thrust angle is off.
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post #5 of 10 (permalink) Old 10-20-2013
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Quote:
Originally Posted by twistid View Post
I found my answer, thrust angle is off.
^^I've seen this before with certain LCA brackets.


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post #6 of 10 (permalink) Old 10-20-2013
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thrust angle is wrong

Edit: treed by a longshot

2002 C5 Z51. MCS 2WNR TT2 coilovers, 18x11 Forgestars, 315's, yada yada. Built Z06 T56. Bolt ons. Coming soon to a CAM event near you.

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post #7 of 10 (permalink) Old 10-20-2013 Thread Starter
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I have Whiteline LCA brackets
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post #8 of 10 (permalink) Old 10-20-2013 Thread Starter
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Just got an alignment

before

LF: RF
-1.2 camber -1.3 camber
9 caster 9.4 caster
-.22 toe -.36 toe
total toe -.57
steer ahead .07
Thrust angle .15

After

same camber
0.00 toe for both
total toe -.02
steer ahead 0.01
thrust angle .16

My rear end kind of worried me though as it has different toe angles... is it off from the factory?
.14 left and -.18 right
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post #9 of 10 (permalink) Old 10-20-2013
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Your rear LCA's effectively have different lengths, and your axle is not perpendicular to the longitudinal centreline of the car. Do you have adjustable rear LCA's? Notice how all the rear angles are pretty close? .14, .18, .15, looks like the error is being carried through the whole rear suspension.

2002 C5 Z51. MCS 2WNR TT2 coilovers, 18x11 Forgestars, 315's, yada yada. Built Z06 T56. Bolt ons. Coming soon to a CAM event near you.

2013 F150 6.2L. 9mpg.

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post #10 of 10 (permalink) Old 10-20-2013 Thread Starter
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Normal Brembo LCAs (gt500's I think) and whiteline LCA relocation brackets. Also after the alignment my rear end stays behind now... no more sideways when spinning the tires
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