Corner Balance?

[ClickClickBoom]

Hey,
I just got my Intercomp SW650 scales, 6000lb capacity. I am in the process of getting my corner balance tightened up. My questions are what should the minimum difference Front L & R, Rear L & R?. Any tricks? Anybody interested in a weekend rental to help me offset the purchase of some spendy scales?
Thanks all,
eric
P.M. If interested

[javadog]

IF my memory is any good, Porsche specified that you should shoot for <20 lbs. on a 911 and <10 lbs, on a 930. Be advised that you need to level the scales for a truly accurate result. In other words, don't assume the surface you use is consistently level from the area under one tire to the next, without checking it first. When concrete is placed, it is seldom leveled very well. I use a long straight-edge, with a machinist's level, to figure out how much to shim the scales.

Have fun,
JR

[DW SD]

you also need to disconnect sway bars and eliminate pre-load after CB with the sway bar links and don't forget to adjust tire pressures, prior, as well.
Jae Lee who set up my suspension adds 190 lbs to the driver's seat, too. I think he shoots for 50 / 50 +/- 3 lbs when looking at sum of cross weights.

Doug

[Porsche84]

I have done corner balancing this way:

Driver wt in driver seat, after Camber and Caster , and ride height are correct put the car with 5 gallons of fuel on the scale. Write down the percent weight on the front (LF + RF), most 911's are near 40%. Then write done the rear %. Now write down the left side weight (LF + LR) and the same for the right side. I created a simple Excel spread sheet to do the calculations to show "optimum" weight to make the process easier as I made changes. The LF "optimum weight" is calculated by multiplying the front % (LF + Rf as a % of total wt) times the Left side weight. The Left Rear is calculated by multiplying the left side weight by the rear %. After you do this for all four corners you will see that none of the "optimums" are exactly the same. That is because the left w/ driver is heavier than the right side. This is one way to do corner weights. There are others. The real goal is to get the car somewhat "balanced" Don't get to anal about the measurements, remember there is probably no place on a race track (or street) that is as level as the scale pad set-up.

By the way, keep measuring the ride heights (I use the fender lip as an easy measurement) during weight adjustments. It is easy to get the car out of whack as you adjust weights. The goal is to keep the ride heights correct during the balance process.

Good luck

[ClickClickBoom]

Schweet!
Keep the info coming!
eric

[dad911]

corner balance 250# driver feasibilty