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Practical Corner Weighting: Left Weight Percentage Practical

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Left Weight Percentage Practical

03.05

00:00 - What we're going to do in this demonstration is check our corner weights and specifically our left percentage weight and then we're going to make a ride height change to the front left and the rear left of the car equally and we're then going to re corner weight the car and just see the effect that that ride height change has had on the left weight percentage.
00:23 So we start by getting the car onto our scales and we can check our existing ride height and to start with we've got a ride height of 88mm at the front and 84mm at the rear of the car.
00:35 With this particular car, given the location of the rim relative to the lip of the guard or fender, it's easiest just to use our steel rule and measure directly between the rim and the guard lip..
00:47 What we can now do is look at our corner weights as the car is currently sitting.
00:51 And what we've done is set up our corner weight scales so that they're displaying the left weight.
00:58 We can see here the left weight total is 631 kg, the total weight is sitting at about 1276 kg, giving us a left weight percentage moving between about 49.45 and 49.47%.
01:14 Now that we know what our starting point is, we can get the car back off our corner weight scales, we'll start by jacking the rear and lifting the rear ride height just on that left hand side.
01:25 When we're doing this, we need to take into account that because of the multi link suspension there is a motion ratio involved so to get our desired ride height change, we're not going to be making that exact change at the coilover suspension.
01:39 In order to give a significant change in our ride height to really see how this affects our left weight percentage, I'm going to make a ride height change front and rear of 10mm and that's reasonably significant.
01:51 Once we've made our change at the rear, we can get the wheel back on, lower the car back onto the ground and of course we're going to make the same change at the front.
01:59 With the MacPherson strut, our motion ratio is generally pretty close to 1:1 so for our 10mm ride height change we're going to start by making exactly that change at the coilover.
02:10 Once we've got our car back on the ground and we've settled the suspension we can get it back up onto the scales and it's always a good. idea to check once the car has settled the suspension, that the ride height change we were aiming for is what we've got.
02:24 In this case, we're on our target ride height so we can again check our corner weights.
02:30 Again with our corner weight scales set up to measure the left hand side of the car, we can see our left hand side weight hasn't changed, it's 631 kg.
02:39 Our overall weight of course hasn't changed either, still sitting at 1276 kg and understandably this means that our left weight percentage is exactly what it was before we made this change.