How do my align specs look? ST 2" drop springs - Chevy Impala SS Forum
 
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post #1 of 8 (permalink) Old 03-26-2004, 03:58 PM
Cory_SS
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CAMBER left = -.3 Right = -.1
CASTER left = 5.4 Right = 5.3
TOE = 1/8" toe in

They said it looked perfect and did nothing to it. I just can't believe it didn't need some kind of adjustment. They said it should be fine as long as I rotate my tires every 9k miles.

So if anyone can chime in that knows align specs please tell me this is ok. I just paid over five bills for these tires and I don't want them getting chewed up. Thanks, Cory
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post #2 of 8 (permalink) Old 03-26-2004, 04:03 PM
AutocroSSer
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Assuming those specs are with weight in the driver's seat, they are good. Tire life should be fine with them.
post #3 of 8 (permalink) Old 03-26-2004, 04:05 PM
Cory_SS
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No that was empty weight. I weigh around 165...you think that would matter?
 
post #4 of 8 (permalink) Old 03-26-2004, 04:24 PM
AutocroSSer
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Your weight in the car will change the specs SLIGHTLY, but should still be fine in this case.
post #5 of 8 (permalink) Old 03-26-2004, 04:46 PM
GM Tech
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Hello Cory_SS,

I can shed some light on this...
First what are we working on? Different vehicles are affected differently by different alignments.(ok, I just beat that word to death)

The numbers are ok. I personally don't like to run more than -.2 degrees due to tire wear-especially with that kinda outlay of funds! As far as rotating the tires... learn to read the treads. You may need to do it more or less depending on your habits. ie.-wearing the rears out before the fronts have a chance to feather-edge.

Does your car drift slightly to the right?
By the numbers, you have -.2 total to the right in camber and -.1 total to the right in caster. Giving you accumulated -.3 degrees influence to the right. What I mean by this is... If the tire was straight up at 0 degrees it would roll straight down a flat surface. Lean it in or out and the tire will roll in the direction of the lean. Now see the tires on the car one leaning -.3 the other -.1, the math says -.2 influence to the weak side- on your car it happens to be the right(camber) same concept applies to caster it pulls/drifts to the weaker side.
The easiest way to explain caster is... the angles on a "chopper" mc and a kids tricycle. Choppers have ghigh speed stability but dont turn in a parking lot worth a darn. Tricycles on the other hand can literally turn on a dime but will crash and burn at high speeds. Somewhere in the middle is a hapy medium. Corvettes run about 6-7 degrees and my Toyota 4X4 specs .25 degrees. With yours at 5.1 and 5.3 your should be in good shape. I would prefer the smaller value to be on the left though.
I prefer about .3 degrees to the left total accumulated influence to compensate for road crown. If it is dead-nuts the car will track straight for about 1/8th mile.
Under NO circumstances would you want to have a left drift- (not even a little)!! It would only be a distraction away from a head on collision!!
As far as the toe... I'm not sure what the inches convert to. I have only worked with degrees.
If someone reading this knows please chime in.

Let me ask you this... Are you going to be chasing cones(autocrossing) or hard cornering?
If you are, Set the camber equal side to side and go with about -.1 to -.2 on each side and make up the .3 to left in caster.

Let me know if this helps
post #6 of 8 (permalink) Old 03-26-2004, 06:32 PM
Amelia
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hi guys i am wondering if i need to get a wheel alignment after lowering my car with the ST springs? I was riding around on my 17 inch stockers and after i lowered the car today i put on my 255/35/20's. So do i need to get a wheel alignment or should i just leave it? thanks in advance for any replys. [img]smile.gif[/img]
post #7 of 8 (permalink) Old 03-26-2004, 09:56 PM
Mike454SS
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Quote:
Originally posted by DeSSmond:
hi guys i am wondering if i need to get a wheel alignment after lowering my car with the ST springs? I was riding around on my 17 inch stockers and after i lowered the car today i put on my 255/35/20's. So do i need to get a wheel alignment or should i just leave it? thanks in advance for any replys. [img]smile.gif[/img]
At the very least put it up on a rack and have the allignment checked. Changing ride height can have a drastic change in allignment. I'm going to bet that the allignment on Cory_SS's car wasn't so great before he lowered it...probably had too much negative camber (from a tire wear point of view). 20 inch tires are expensive...I wouldn't want to be wearing the outsides of them down in 10K miles because I didn't spend $60 to put the car up on a quality allignment rack, check the specs and go from there...I don't see a car with 20's getting a very performance oriented allignment, but I do see it getting a tire wear oriented allignment.
post #8 of 8 (permalink) Old 03-26-2004, 10:41 PM
Cory_SS
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GM Tech...and your right on the money. It does pull to the right a little and the guy said it was probably my wide 275 tires wandering. I didn’t buy that explanation and what you said makes perfect sense. Thank you for the insight!

Dessmond...yes I would recommend at least getting it checked. I think Mike454SS was right. My alignment was off before I dropped it. The old tires did show signs of wear on the outsides. So I'm guessing the drop fixed the problem. I've only had the car for about a year and it has only been driven 8k miles since then. When I got the car I knew it needed tires so I waited until the tires were about to fall off and replaced them. So I never bothered to get an alignment since the tires were shot anyway. I would say if your car was aligned correctly before the drop it would more then likely need an alignment now.

BTW this was done to my SS not my bird...
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