07-27-2020, 05:05 PM | #29 |
Drives: 1LEs Join Date: May 2009
Location: DFW - Texas
Posts: 1,319
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The holes through the rear cradle for the alignment pins are just behind the rear bushings. You'll see a hold through both lower and top side of the cradle and a mating hole in the body for the cradle alignment pins to go through. Mine cradle has not been out yet or moved. One day, I'll finally install my solid bushings I've had up on the shelf (forever).
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07-27-2020, 06:16 PM | #30 | ||
Drives: Chevrolet SS 1LE Join Date: Oct 2019
Location: St. Charles, MO
Posts: 1,446
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Quote:
That pic has all of rear suspension still attached to the cradle. The only things that touch the unibody besides the four cradle mounts are the tops of the shocks and coil springs, but those don't do anything to locate the wheel and therefore have no say in alignment. The front suspension is different, because it has struts that attach to the unibody at the strut towers. So if you shift the front subframe right or left you affect camber on each side. But the rear isn't like that. Quote:
Here, the center black square is the cradle and the outer black rectangles are the tires or hubs. The red links are lateral suspension links, and the yellow links are the toe links. When the cradle is nice and square with the thrust centerline of the car, the tires aim straight ahead and the toe link lengths are equal to each other. When it's skewed off of the thrust line (second example), the tires can still be aimed exactly straight ahead (zero total toe relative to each other) but the left toe link has to be a lot longer than the right one to achieve that. Our cars effectively run out of toe link length when we dial in lots of negative camber, so this could explain why the right side can easily be at zero toe but the left side cannot. I hope this makes sense.
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Matt Miller
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07-27-2020, 07:14 PM | #31 |
Drives: Chevy Camaro Join Date: Nov 2019
Location: TBD
Posts: 276
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Sorry to hear you are having issues and hopefully it is an easy fix. Not implying this is the issue but I believe Chevy had a problem with toe links cracking back in 2016. Any idea if the Techs actually inspected the toe links? Or did they just focus on the job at hand? It's very easy to miss these small details. Also once you sort this out have them do a dynamic alingment with you in the car and a 1/2 tank of petrol.
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07-27-2020, 08:42 PM | #32 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
Location: Canada, eh!
Posts: 5,091
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Quote:
The tech surely runs out of the toe link length on the RL, so a crabbed cradle could indeed be an issue. But: Given he can only dial in about 1.4 camber to start with, any idea what condition could cause THAT issue? Is there a related test that could be done on the RR to help with that determination, perhaps? Or some other checks, or measurements that could possibly help in finding a root cause? Unless GM decides to send their top suspension corporate tech to check my car, i am afraid i may have to provide as many possible suggestions and tests for the dealer techs as possible. As much as they may be good techs per se, it is clear, that they have never run into such an issue before. And i am unsure to what extent they understand inter relationships of different parts et al. I really need to get them to the root cause, as if this is overly complex (as in faulty assembly of sorts), i dont want to end up with half a solution and an ill handling car "by design". Again, much appreciate all the details, explanations and the illustration. Simply brilliant! Cheers! |
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07-27-2020, 08:58 PM | #33 | |
Drives: Chevrolet SS 1LE Join Date: Oct 2019
Location: St. Charles, MO
Posts: 1,446
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Quote:
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Matt Miller
2020 SS 1LE |
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07-27-2020, 08:58 PM | #34 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
Location: Canada, eh!
Posts: 5,091
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Quote:
The last tech spent a good hr or so, just trying to dial the LR (i told him up front it was an issue, based on the first alignment). While RR took a few mins. He was extremely apologetic and i think he did his best, considering the circumstances. He backed out the camber to ensure i had even toe in, even if i ended up with 1.1 and 1.6 (L/R). But he alerted me to the fact he could not fix it. The first tech (different shop) sent me home with 1.4 and 0.3 toe *out*, which was completely unacceptable. |
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07-27-2020, 09:08 PM | #35 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
Location: Canada, eh!
Posts: 5,091
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07-27-2020, 09:52 PM | #36 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
Location: Canada, eh!
Posts: 5,091
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Quote:
In other words, could the subframe in any way play a role? Or, is that out of the question? Thanks! |
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07-27-2020, 10:39 PM | #37 |
Drives: 2022 1SS 1LE A10 BCD WCT+PDR Join Date: Mar 2008
Location: Johnstown, PA
Posts: 3,206
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2 different shops and 2 different techs performing them, correct?
At the rear, adjusting the camber will change the toe. But, and I am not certain, but on a Gen6, adjusting the toe may not have as large of an affect on the camber as the Gen5 Camaros do. If it does, then giving it more toe in will change the camber to more negative. OP, can you take a current picture of the LR rear adjustment eccentrics? Like this:
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Last edited by cdb95z28; 07-27-2020 at 10:52 PM. |
07-28-2020, 05:09 AM | #38 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
Location: Canada, eh!
Posts: 5,091
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Quote:
The second shop/tech (both GM dealers btw) has a Vette friendly rack and is much closer to me. Unfortunately, the dealer i bought the car from is equally close, but they dont have a proper rack. However, the co owner whom i know, has promised to escalate this to GM corporate. I will snap a pic a bit later this am. Cheers! |
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07-28-2020, 07:48 AM | #39 | |
Drives: Chevrolet SS 1LE Join Date: Oct 2019
Location: St. Charles, MO
Posts: 1,446
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Quote:
You can pick it out in the picture of the "fully loaded" cradle I posted a few posts back. So the cradle and unibody is all there is back there. I don't see any way that a misalignment between the cradle and unibody could cause a loss of camber range.
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Matt Miller
2020 SS 1LE |
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07-28-2020, 08:08 PM | #40 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
Location: Canada, eh!
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Quote:
PS Sorry no pix today as i had to be away all day. Will post some tomorrow. Cheers! |
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07-28-2020, 09:02 PM | #41 | |
Drives: Chevrolet SS 1LE Join Date: Oct 2019
Location: St. Charles, MO
Posts: 1,446
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Quote:
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Matt Miller
2020 SS 1LE |
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07-29-2020, 07:26 AM | #42 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
Location: Canada, eh!
Posts: 5,091
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