THSCC Forums

Anyone have any ideas of what the proper corner weights should be
on my Subaru. The car is a sedan. I have coilovers and can adjust the weights to some degree. On a related note, a car that is prone to understeer normally, should or would you corner weight differently?
Thanks to all who reply. I hope to be back on track soon and pass on my burnt piston award to someone else.

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2008 Burnt Piston Award Winner!!!!

Great article:

http://grassrootsmotorsports.com/articl ... r-weights/

FYI no tuning for understeer/oversteer is going to happen with corner weighing. That's all springs and swaybars.

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Mike Whitney
whit32@gmail.com, 919-454-5445
V10, V8, V8t, I6, I6, V6, F4t, I4, I4, I4, I4, I2, 1, 1

If the under/over steer is worse in one direction than the other you might be able to use corner weighting to help equalize the diagonals . . . especially since the driver weight is mostly on the left front and will normally make that corner heavy and more understeery. If you add "height" to either the RF or LR coil over you put more of the front weight to the right and more of the rear weight to the left. Basically similar to what the roundy round guys do to change the balance. Think "weight jacking" but with the goal of making the car turn left or right the same.

You probably cannot make the front weights equal but you might be able to add enough weight to the left rear to take rear grip away in right turns to compensate for the heavy left front understeer. Hence, better balance.

If nothing else, you might make the car a little easier to rotate for right turns since, for me at least, it is easier to get rotation turning left than turning right, even with a symetrical car where I sit in the center.

Pay attention to anti-roll bar preload when you do this. You probably need adjustable end links.

Dick

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Dick Rasmussen

FS 50 2018 Mustang GT

Thanks guys. Not sure if I need to unhook my sway bars and do this again? Still unsure about sway bar preload and how it affects these measurements???

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2008 Burnt Piston Award Winner!!!!

When you set corner weights. You want to start with 0 preload. So disconnect 1 corner of the front and rear sway bars. That way the sway bar does not come into play.

If you have adjustable end links then once the car is balanced the way you want. Adjust the end links so they line up with the mounting hole and tighten them up. Now you have your balance and no preload. If you don't have adjustable end links. Reconnect them and then readjust coils/springs to get balance back.

You can affect corner weights on purpose by setting preload into a sway bar.

For a road course or autocross car I'm not sure you would want to add preload. Unless you have real problems balancing it. My car is set up almost 50/50 with no preload.

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http://www.greywinds.com