Urgent alignment/ELC/geometry help needed - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-17-2004, 01:43 PM   #1
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Default Urgent alignment/ELC/geometry help needed

My Factory Service Manuals are still out on loan.

How much of an effect does ELC ADJUSTMENT have on Camber? Should I get this set perfectly before a rear wheel alignment?

How much of an effect does ELC have on rear camber?



I'm getting an alignment done tomorrow (Monday) at 11am. Keep in mind I recently replaced my rear struts, and just yesterday put new tires on the car.
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Old 10-17-2004, 02:56 PM   #2
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Looking it up.
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Old 10-17-2004, 03:05 PM   #3
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As long as the rocker panel 23.5" infront if the center of the rear tire is 9 9/32" to 10 1/16" from the ground and does not differ by more the 3/4" between the two sides, you're cool.
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Old 10-17-2004, 03:34 PM   #4
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Ok, that'* cool. A real reference. So what'* the overall camber angle range the ELC can affect? From bottom travel to top travel?
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Old 10-17-2004, 05:29 PM   #5
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I've read through 2 service manuals and the only reference is to have the elc adjusted to ride height before doing the alignment. As Damem said the front and rear should be within 3/4". There is no mention of how the elc affects camber either positive or negative?
Looking at the mechanics though I would expect the camber to go positive on compresion and negative in extension? But by how much would only be a guess, say 1.5-2* over the whole travel?
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Old 10-17-2004, 05:50 PM   #6
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1.5 to 2 would be acceptable in my mind. So I need to set my ELC where I want it (high end of the rear range) and then align. The weather is a problem, so I'm going to try to work the ELC fine adjustment (which is high with the replacement struts I just installed) at the same time as the alignment while it'* on the rack in the morning.

With new tires and rear struts on the car, I want things right (especially since the tire shop went through all the extra effort of road course balancing all 4 of my tires, which included de-mounting and re-mounting 2 of them).
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Old 10-18-2004, 01:41 PM   #7
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Here you can see the height my new rear struts left the car at (requiring an ELC adjusment), and if you look closely, you can actually see the camber from the strut change. I'm going to drop the rear about 1/4 to 1/2" in an hour on the alignment rack before they do any adjusting:







This thing should be riding NICE very soon. Front struts are 6 months old, rear are brand new, all Poly endlink bushings front and rear, new tires, new alignment, tires are road course-balanced and siped.
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Old 10-18-2004, 02:36 PM   #8
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Damemorder, your dimensions must be for the SE without the 'fat' lower rocker trim. Mine obviously sits high, yet I have only 9" of clearance at that 23.5" point forward of the rear wheel centerline.

I'm just going to have to eyeball this one. Alignment in 30 minutes.
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Old 10-18-2004, 03:56 PM   #9
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Nope, it'* measured basically under the rocker, right next to where the tack weld turns down. They're the same on all cars it says...

There'* a way to measure the control arms...From the centerline of the control arm bolt, measured straight down to the lowest point on the ball joint housing (except grease fitting) should be 2 11/16" to 3 7/16"

(3-27 and 3-2
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Old 10-18-2004, 05:51 PM   #10
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Heh, just jacking the car up will give you mad camber...



(shudders at old bumper)



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