997.2 gt3 Corner Balance advice needed.
09-11-2017, 12:45 PM
#1
Instructor
Thread Starter
997.2 gt3 Corner Balance advice needed.
Vehicle: 2011 Porsche 997.2 GT3
I just had my car put on scales, the following figures represent no driver, half tank of gas and sway bars connected.
Left front 635lbs
right front 589lbs
left rear 989lbs
right rear 1001lbs
My questions:
1. Do the numbers look off? keep in mind no driver or weights were added.
2. Should I complete a corner balance with factory Non-adjustable drop links?
3. Is half tank of gas proper/sufficient for the corner balance?
I just had my car put on scales, the following figures represent no driver, half tank of gas and sway bars connected.
Left front 635lbs
right front 589lbs
left rear 989lbs
right rear 1001lbs
My questions:
1. Do the numbers look off? keep in mind no driver or weights were added.
2. Should I complete a corner balance with factory Non-adjustable drop links?
3. Is half tank of gas proper/sufficient for the corner balance?
09-11-2017, 02:29 PM
#2
Race Car
1) Not a bad starting point I guess. without a calculator cross weighs are like 48.5 and 51.5 or something close to that but could be better if you're going through all the effort.
2) Disconnect the sway bar for corner balance. You can just remove one side of the drop links to do this you don't have to fully disconnect both sides. Then re-connect the drop links after and use the spinning mounts to set preload on those drop links if necessary
3) I always do it with half tank. I think the porsche manual technically calls for doing it with a full tank of gas.
4) Add drive weight or this is all for not. I realize there will many times when you'll have a passenger but more often than not set it for when you're the only one in the car.
2) Disconnect the sway bar for corner balance. You can just remove one side of the drop links to do this you don't have to fully disconnect both sides. Then re-connect the drop links after and use the spinning mounts to set preload on those drop links if necessary
3) I always do it with half tank. I think the porsche manual technically calls for doing it with a full tank of gas.
4) Add drive weight or this is all for not. I realize there will many times when you'll have a passenger but more often than not set it for when you're the only one in the car.
09-11-2017, 05:54 PM
#3
Instructor
Thread Starter
Excuse my ignorance but by "use the spinning mounts" are you referring to adjustable drop links? I was not aware that stock drop links offered adjustability.
09-11-2017, 09:46 PM
#4
Rennlist Member
I've seen it where the wheel weights are almost exactly the same from right to left. However, if the sum of the right front and the left rear are the same as the left front and right rear, then it's considered properly corner balanced.
My car is just that. Not exact when you compare the right front with the left front but exact when you compare cross weights.
Your corner balance could have been slightly better. What did you pay for it and were you siting in the car when this was being done?
My car is just that. Not exact when you compare the right front with the left front but exact when you compare cross weights.
Your corner balance could have been slightly better. What did you pay for it and were you siting in the car when this was being done?
09-12-2017, 06:38 AM
#5
Rennlist Member
You need to get it on scales with driver weight and drop links disconnected.
09-12-2017, 10:06 AM
#6
Race Car
No, the mounts on the shock itself are on the threaded shock body and can be moved up and down to adjust preload if you don't have adjustable drop links. It's a real pain in the *** to do it as you have to almost completely remove the shock to do it, but it's possible.
09-12-2017, 10:09 AM
#7
Purpose of corner balancing is to get the cross weight as close as possible. Yours is 49% which isn't horrible. To fix this lengthen the front right and left rear spring adjusters 1/8 in. each then recheck. I would check it with sway bars disconnected before making any changes as this can affect cross weights. Contrary to popular belief the cross weight percentage doesn't change if driver added or 1/2 vs full tank of gas. The weight distribution will change but the cross weight percentages will not. Nobody believes me on this because it sounds counter intuitive but you can test this next time you put it on the scales by weighing with and without driver. The values will change but the percentages will not.
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09-13-2017, 12:21 PM
#8
Instructor
Thread Starter
No, the mounts on the shock itself are on the threaded shock body and can be moved up and down to adjust preload if you don't have adjustable drop links. It's a real pain in the *** to do it as you have to almost completely remove the shock to do it, but it's possible.
Purpose of corner balancing is to get the cross weight as close as possible. Yours is 49% which isn't horrible. To fix this lengthen the front right and left rear spring adjusters 1/8 in. each then recheck. I would check it with sway bars disconnected before making any changes as this can affect cross weights. Contrary to popular belief the cross weight percentage doesn't change if driver added or 1/2 vs full tank of gas. The weight distribution will change but the cross weight percentages will not. Nobody believes me on this because it sounds counter intuitive but you can test this next time you put it on the scales by weighing with and without driver. The values will change but the percentages will not.
