Blog

4 December 2014

Torsion Bar Tuning

The owner of this Porsche came to us, because after getting his vehicle fully restored it was driving worse than before!

 

Porsche 911 2

The steering felt terrible, the car felt very unstable and it was pulling to the left quite dramatically. We looked at the alignment, and while it wasn’t perfect, it certainly wasn’t the reason the car was behaving the way it was. So the next thing we looked into was the torsion bar set up on this car, as both front and rear are sprung by torsion bars. We got the Porsche up onto our corner weighting scales to see where the weight was.

 

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 Picture 1 shows what we saw. There was a lot more weight over the front right and rear left. But the ride heights were very similar. This happens when you use opposing corners of the car to bring the ride heights up, although the heights are correct, the car is drastically un balanced. These weights show NO driver in the vehicle as it would have only resulted in an even worse scenario .

 

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Picture 2 shows the result after we spent considerable time re setting all the torsion bars to a spot where we were happy and the weight was more evenly distributed. Again there is no driver weights shown in the vehicle.

 

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Picture 3 shows the vehicle with the driver in the seat. The weight balance is now as close to perfect as you can expect from a road going production car, and it drives better than ever.

Corner weighting is not only useful for motorsport, but as you can see by this example, it can be vital in getting your car feeling “right”.

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