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Old 03-13-2003, 07:59 PM   #1
hokiewrx
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Default Alignment specs and corner weight specs

I get my coilovers next week and I need to get the stock alignment specs as well as the corner weight numbers so when I take it in they can get this all straight.

Also, if there's something I should change let me know!

TIA
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Old 03-13-2003, 10:03 PM   #2
jeffg
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Default

corner weight is not a spec like camber or caster. You will need to weigh you car and then decide what kind of weight distrobution you want. The knee jerk reaction is 25% of the weight on each corner. Not sure if that is ideal, or possible though.

J
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Old 03-13-2003, 10:37 PM   #3
OnTheGas
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Default Re: Corner Weights

Quote:
Originally posted by jeffg
The knee jerk reaction is 25% of the weight on each corner. Not sure if that is ideal, or possible though.
If you get 25% on each corner with your wrx, let us all know how you did it... wrx's are nose-heavy. jk!

Seriously, the goal is to weigh each corner, then calculate your cross weights... For instance,
LF + RR = X
RF + LR = Y
You will want to adjust so that X = Y.

Also, you should consider passenger weight. You may be wise to have your driver weight in the front seat (either your body, or replace your body w/something of similar weight in the front seat). Then consider if you want to add the weight of a passenger... Do you carry a front seat passenger often? Then it may be wise to approximate their weight. Or if you only drive hard when you have no passenger, then don't worry about. You can compromise and put half the weight of your average passenger in the front passenger seat... whatever lights your candle.

I hope the shop you are taking your car to can handle corner weighting. They will need to have the four scales, leveled out, etc.

Regarding your alignment specs, what size tires are you running?
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Old 03-13-2003, 11:17 PM   #4
froggert
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if you're running coilovers, why are you going to align to stock specs?
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Old 03-13-2003, 11:19 PM   #5
hokiewrx
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Default Re: Re: Corner Weights

Well, they told me they have the scales, etc. So I hope so too!
Thanks for all your advice. If I'm not going to be able to get 25% all the way around is there something I should shoot for?

I will be running 225/40/18.



Quote:
Originally posted by OnTheGas
If you get 25% on each corner with your wrx, let us all know how you did it... wrx's are nose-heavy. jk!

Seriously, the goal is to weigh each corner, then calculate your cross weights... For instance,
LF + RR = X
RF + LR = Y
You will want to adjust so that X = Y.

Also, you should consider passenger weight. You may be wise to have your driver weight in the front seat (either your body, or replace your body w/something of similar weight in the front seat). Then consider if you want to add the weight of a passenger... Do you carry a front seat passenger often? Then it may be wise to approximate their weight. Or if you only drive hard when you have no passenger, then don't worry about. You can compromise and put half the weight of your average passenger in the front passenger seat... whatever lights your candle.

I hope the shop you are taking your car to can handle corner weighting. They will need to have the four scales, leveled out, etc.

Regarding your alignment specs, what size tires are you running?
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Old 03-13-2003, 11:21 PM   #6
hokiewrx
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PSM

Default

Quote:
Originally posted by froggert
if you're running coilovers, why are you going to align to stock specs?
Well that is something I need to understand... I'm in a *little* over my head because I've never had coilovers before. I'm not interested in eating my tires alive, that's why I mentioned stock. Any insight would be very helpful!
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Old 03-13-2003, 11:43 PM   #7
OnTheGas
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Default Re: Corner Weights

Quote:
Originally posted by hokiewrx
If I'm not going to be able to get 25% all the way around is there something I should shoot for?
I guess I didn't explain it very well before...

Don't worry about the corner weights... If the shop has the scales, they'll explain it to you. What they are going to do is equalize your cross weights, which is:
Left Front + Right Rear weight
and
Right Front + Left Rear weight

All you need to worry about is how you want to weigh the car... either w/driver alone, or w/driver + 1/2 passenger, or driver w/1 passenger, etc.

Regarding your nice 18" wheels, you can live with a little less neg camber than you could if you had 16" tires. You're lower profile 18" tires will have less sidewall rollover. Hence the question.

However, I'll let someone else advise on coil-over alignment specs for 18' tires, since I have no experience on that, and someone else does...

Have fun!
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Old 03-13-2003, 11:52 PM   #8
froggert
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ram 1500, 1098s, m620

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tire wear depends on a few factors. my car is similar to yours, but different. i'm running -1.6 degrees of camber up front and zero toe and still wear the outsides of the tires faster than the insides. who knows that they'd look like if i ran stock specs (-.8? -1?).

cornerweighting explained by grm: http://www.grassrootsmotorsports.com/cornerweight.html
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Old 03-14-2003, 07:29 AM   #9
hokiewrx
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PSM

Default Re: Re: Corner Weights

Actually you did explain it well... what I'm trying to get an idea is what other peoples distribution have been and the reason they chose to go that way, I was the one who was unclear :-)

Quote:
Originally posted by OnTheGas
I guess I didn't explain it very well before...

Don't worry about the corner weights... If the shop has the scales, they'll explain it to you. What they are going to do is equalize your cross weights, which is:
Left Front + Right Rear weight
and
Right Front + Left Rear weight

All you need to worry about is how you want to weigh the car... either w/driver alone, or w/driver + 1/2 passenger, or driver w/1 passenger, etc.

Regarding your nice 18" wheels, you can live with a little less neg camber than you could if you had 16" tires. You're lower profile 18" tires will have less sidewall rollover. Hence the question.

However, I'll let someone else advise on coil-over alignment specs for 18' tires, since I have no experience on that, and someone else does...

Have fun!
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