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-   -   2002 M3 Stock weights and corner percentages (http://forum.e46fanatics.com/showthread.php?t=970153)

lmcgrew79 02-08-2013 08:10 PM

2002 M3 Stock weights and corner percentages
 
After corner balancing the viper this evening i thought i would throw the m3 on the scales and see how its set up in factory form.

With me in the car seems and 3/4 tank of fuel
http://i119.photobucket.com/albums/o...ps4fb1791f.jpg

No Driver
http://i119.photobucket.com/albums/o...psfadbcc28.jpg

Viper Acr is about 100 pounds lighter.
http://i119.photobucket.com/albums/o...iperWeight.jpg

http://i119.photobucket.com/albums/o...ps154c029c.jpg

SocratesRising 02-09-2013 05:22 PM

230 lb driver and it was only off by 80 lbs. front right to front left...pretty good?

lmcgrew79 02-10-2013 03:10 PM

Balanced very well for factory.

peytonracer4 02-10-2013 03:26 PM

Omg that viper! :drool:

TerraPhantm 02-10-2013 03:55 PM

What options do you have on the M3?

mkodama 02-10-2013 04:01 PM

Quote:

Originally Posted by TerraPhantm (Post 15148424)
What options do you have on the M3?

I'm curious as well.

lmcgrew79 02-10-2013 04:38 PM

2002 smg car 18" factory wheels all factory components with sunroof and no nav. I think pretty much most options. Even has the floor and trunk mats in it.

lmcgrew79 02-10-2013 04:50 PM

http://i119.photobucket.com/albums/o...psd0703215.jpg

Seems to be a lil higher than factory curb weight rating of 3415, maybe the smg.

cyberkaa 02-10-2013 05:59 PM

Very interesting
Makes me wonder how much lighter my 6MT slicktop coupe is with no options except for heated seats.

Taunto 02-11-2013 05:23 PM

Hey there imcgrew. Would you be kind to explain what your changing when doing a corner balance on a vehicle. I'am a licensed tech just never seen or preformed a corner balance myself. Very interested in how it works and what changes will have effect on the car. I haven't been able to find much info on this myself. You could always pm me or post it here. Very interested. Thank you.

Sent from my SGH-I747M using Bimmer App

lmcgrew79 02-12-2013 10:05 PM

What your changing is the amount of weight applied to each wheel by adjusting the ride height. Ideally you want equal weights at all corners for a balanced car. Short of physically moving weight around which can be hard to do in a street car, you adjust the diagonal weights left rear and front right to be the same percentage as the right rear and front left. Think of it as a sitting in chair with springs as legs, if you shorten one corner there is gonna be less weight on that corner and cause the chair to rock. Total side weight and front or back weight will never change unless you move something in the car. What you can change is the weight diagonally though, raising one corner will put more weight on that corner and transfer weight from the other 3 corners. On a road track it balances the car and makes it react the same way turning left as turning right.

Also you cant do this unless you have an adjustable ride height suspension.

BWOODM3 02-12-2013 10:40 PM

Anymore pics of the viper?

lmcgrew79 02-12-2013 11:12 PM

Heres a handfull

http://i119.photobucket.com/albums/o...ViperNoble.jpg

http://i119.photobucket.com/albums/o...ngine-Shot.jpg

http://i119.photobucket.com/albums/o...4F65F87405.jpg

http://i119.photobucket.com/albums/o...3A33FCB377.jpg

http://i119.photobucket.com/albums/o...psbf64a519.jpg

http://i119.photobucket.com/albums/o...392B0AEEED.jpg

Ntrb8s4 02-13-2013 08:04 AM

Quote:

Originally Posted by lmcgrew79 (Post 15156910)
What your changing is the amount of weight applied to each wheel by adjusting the ride height. Ideally you want equal weights at all corners for a balanced car. Short of physically moving weight around which can be hard to do in a street car, you adjust the diagonal weights left rear and front right to be the same percentage as the right rear and front left. Think of it as a sitting in chair with springs as legs, if you shorten one corner there is gonna be less weight on that corner and cause the chair to rock. Total side weight and front or back weight will never change unless you move something in the car. What you can change is the weight diagonally though, raising one corner will put more weight on that corner and transfer weight from the other 3 corners. On a road track it balances the car and makes it react the same way turning left as turning right.

Also you cant do this unless you have an adjustable ride height suspension.



I'm getting my coil overs installed today. The shop told me I should corner balance it. I told him I'd let him know. Is it nesscary for a street car?

DSilk56 02-13-2013 11:17 AM

Quote:

Originally Posted by lmcgrew79 (Post 15148532)
http://i119.photobucket.com/albums/o...psd0703215.jpg

Seems to be a lil higher than factory curb weight rating of 3415, maybe the smg.

More likely it's the 3/4 full gas tank. Factory listed weights are dry weights.

Taunto 02-13-2013 04:56 PM

Thank you for the insight lmcgrew79. I knew that it could only be done with adjustable suspension. Well when ever i get the suspension done on my M3 after buying my new house this summer I will look more into the equipment or allow a shop to take me through the process. Thank you very much

love the pics and Viper looks good. Are u planning on trading that Viper in for the new one due to the Independent rear suspension being installed on the new vipers?


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