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Brakes & Suspension Forum sponsored by The Tire Rack |
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03-13-2003, 07:59 PM | #1 |
Scooby Newbie
Member#: 18505
Join Date: May 2002
Chapter/Region:
MAIC
Vehicle:2004 STi PSM |
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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03-13-2003, 10:03 PM | #2 |
Scooby Guru
Member#: 2958
Join Date: Nov 2000
Chapter/Region:
NWIC
Vehicle:2001 2.3RS? |
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 |
03-13-2003, 10:37 PM | #3 | |
Scooby Specialist
Member#: 3807
Join Date: Jan 2001
Chapter/Region:
SCIC
Location: Orange, CA, USA
Vehicle:2002 WRX Sedan Silver, tinted |
Re: Corner Weights
Quote:
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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03-13-2003, 11:17 PM | #4 |
Scooby Specialist
Member#: 768
Join Date: Jan 2000
Chapter/Region:
Tri-State
Location: nj
Vehicle:OB, volt, 911, ram 1500, 1098s, m620 |
if you're running coilovers, why are you going to align to stock specs?
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03-13-2003, 11:19 PM | #5 | |
Scooby Newbie
Member#: 18505
Join Date: May 2002
Chapter/Region:
MAIC
Vehicle:2004 STi PSM |
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:
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03-13-2003, 11:21 PM | #6 | |
Scooby Newbie
Member#: 18505
Join Date: May 2002
Chapter/Region:
MAIC
Vehicle:2004 STi PSM |
Quote:
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03-13-2003, 11:43 PM | #7 | |
Scooby Specialist
Member#: 3807
Join Date: Jan 2001
Chapter/Region:
SCIC
Location: Orange, CA, USA
Vehicle:2002 WRX Sedan Silver, tinted |
Re: Corner Weights
Quote:
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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03-13-2003, 11:52 PM | #8 |
Scooby Specialist
Member#: 768
Join Date: Jan 2000
Chapter/Region:
Tri-State
Location: nj
Vehicle:OB, volt, 911, ram 1500, 1098s, m620 |
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 |
03-14-2003, 07:29 AM | #9 | |
Scooby Newbie
Member#: 18505
Join Date: May 2002
Chapter/Region:
MAIC
Vehicle:2004 STi PSM |
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:
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