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  #1  
Old 05-28-2016, 10:15 AM
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Alignment...

We recently installed a new set of Pirelli Scorpion Verde A/S plus on our JGC at 28k miles. I noticed some inside shoulder wear on the old Michelins, so took it into a good local shop (LeMeilleurs) that has a new Hunter alignment rack. They discovered the front toe was out of spec (both toed out) and, thusly, steer ahead was out. They also recalibrated the steering angle sensor. They also discovered that only my right rear toe was out of spec and, after adjustment to within spec, they said the rear trailing arm was tweaked and they could not do any more adjustment. They said this might be an issue the next time we install tires.

It actually feels much better upon turn in now. They also did our Kia Optima at 35k, which was way out spec both front and rear and the tires reflected that. After the alignment and with the new Pirelli P7's, the Kia handles wonderfully well.

My recommendation : Find a good alignment shop (with a Hunter Rack) and have them check it out after you get new tires fitted. Or even if you've noticed unusual tire wear.

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2014 GC Overland 4x4, 3.0CRD, ATG, ORAII ("Smiffy")
2015 Lance 1685 Travel Trailer "#4"
2011 Kia Optima EX-L ("MC"
2003 BMW R1150RT "Darth"
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  #2  
Old 05-28-2016, 02:44 PM
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Re: Alignment...

Quote:
Originally Posted by philbytx View Post
We recently installed a new set of Pirelli Scorpion Verde A/S plus on our JGC at 28k miles. I noticed some inside shoulder wear on the old Michelins, so took it into a good local shop (LeMeilleurs) that has a new Hunter alignment rack. They discovered the front toe was out of spec (both toed out) and, thusly, steer ahead was out. They also recalibrated the steering angle sensor. They also discovered that only my right rear toe was out of spec and, after adjustment to within spec, the upper control arm had no more adjustment left in it. This might be an issue the next time we install tires.

It actually feels much better upon turn in now. They also did our Kia Optima at 35k, which was way out spec both front and rear and the tires reflected that. After the alignment and with the new Pirelli P7's, the Kia handles wonderfully well.

My recommendation : Find a good alignment shop (with a Hunter Rack) and have them check it out after you get new tires fitted. Or even if you've noticed unusual tire wear.

The control arms, both front and rear, have very LITTLE, if any, impact on toe in/out. The control arms are adjusted to dial in camber/caster in the front, and camber in the rear. Toe is set by the tie rods ends.

Just for clarification, adjusting caster and camber CAN have an effect on toe, but you don't adjust toe with the control arms.....
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  #3  
Old 05-28-2016, 10:36 PM
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Re: Alignment...

Hey Leadfoot,

Thanks for pointing that out. My bad, it should have been they discovered the RR trailing arm was tweaked and they could not adjust the RR toe any more.
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2014 GC Overland 4x4, 3.0CRD, ATG, ORAII ("Smiffy")
2015 Lance 1685 Travel Trailer "#4"
2011 Kia Optima EX-L ("MC"
2003 BMW R1150RT "Darth"
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  #4  
Old 05-29-2016, 10:05 AM
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Re: Alignment...

Quote:
Originally Posted by philbytx View Post
Hey Leadfoot,

Thanks for pointing that out. My bad, it should have been they discovered the RR trailing arm was tweaked and they could not adjust the RR toe any more.
If that's what they told you, something still isn't quite right. Even in the rear, where there is not a caster setting, there is a camber spec, which is set by adjusting the lower a-arm. The rear toe is set by adjusting a tie rod, somewhat similar to the front.....
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  #5  
Old 05-29-2016, 11:30 AM
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Re: Alignment...

Thanks. They also mentioned the next time, consider installing aftermarket arms that allow for more adjustment than the stock Jeep arms.

FYI -

The Front Camber and Caster were within spec but the Toe was definitely out.
LH front : -0.02 RH Front: -0.16 Total Toe -0.18
Steer ahead was 0.07.

After adjustment : LH Front: 0.08 RH Front 0.09 Total Toe: 0.17
Steer ahead : -0.01


My rear before and after figures on the Hunter rack were as follows :
LR Camber: before -1.5 after -1.6 RR Camber: before - 1.0 after - 0.7
LR Toe: before 0.21 after 0.22 RR Toe: before 0.43 after 0.33
He said the RR toe adjustment was pretty much maxed at 0.33.

Total Toe : before 0.64 after 0.55
Thrust Angle: before -0.11 after -0.05

Also, here is a linky to a primer on alignment, should anyone be interested :

http://www.anewtoronto.com/wheel%20alignment.html
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Phil C.
2014 GC Overland 4x4, 3.0CRD, ATG, ORAII ("Smiffy")
2015 Lance 1685 Travel Trailer "#4"
2011 Kia Optima EX-L ("MC"
2003 BMW R1150RT "Darth"
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  #6  
Old 05-29-2016, 12:40 PM
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Re: Alignment...

I'm not 100% positive about these numbers, as I got them off an internet site, but nonetheless, these are the settings that are supposed to be used, for a WK2 Jeep's alignment:

FRONT

Camber LF....-0.64* RF....-1.14*
Caster LF.......5.5* RF....5.5*
Toe.... 0.20* total


REAR

Camber LF....-1.14* RR....-1.14*
Toe.... 0.40* total



Not to be a jackass, and take "cheap shots" at the people you're taking your Jeep to, but let me say this....Just because a shop has spent the money for a Hunter machine, doesn't mean their guys know how to use it.


Just out of curiosity, does your GC have the Quadra-Lift? If so, do the people that are doing your alignments know that the vehicle has to be set in "alignment mode", and allowed to settle, before attempting an alignment?
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  #7  
Old 05-29-2016, 04:00 PM
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Re: Alignment...

Yes, it was in alignment mode (Aero) and the Hunter Computer specs were correctly set for 2014 JGC, 4WD and Quadralift. Like Ronnie Reagan, I trust but verify so I had a copy of the Jeep alignment spec from FCA.

FYI - The Hunter system has the spec "spread" on the printout, so you can compare to the actual before and measurements. And this was not the 1st QL Jeep they had done.

I could feel the difference driving it away from the shop. The steering felt much more centered and turn in was a little more precise/crisper.
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2014 GC Overland 4x4, 3.0CRD, ATG, ORAII ("Smiffy")
2015 Lance 1685 Travel Trailer "#4"
2011 Kia Optima EX-L ("MC"
2003 BMW R1150RT "Darth"
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