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the biggest contributor to transmission loss is usually tyres and pressures, the tyres absorb more energy as their road speed increases, the gearbox, diff and driveshafts all cause loss owing, to oil drag and bearing friction

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the biggest contributor to transmission loss is usually tyres and pressures' date=' the tyres absorb more energy as their road speed increases, the gearbox, diff and driveshafts all cause loss owing, to oil drag and bearing friction[/quote']

correct-a-mongous.

Also, transmission loss is measured on the dyno by letting the wheels spin down of their own accord - the rate of deceleration giving the power loss. So, if for example your control arm bushes are shot, the wheels can be pointing in slightly different directions from being driven up to being spun down. Applying power to the front wheels make them try to toe in whilst letting them spin down makes them try to toe out.

Other things, like if your clutch is not disengaging fully will also cause drag on the transmission when its being spun down for the power loss figures (assuming the dyno operator simply dips the clutch in and doesn't take it out of gear).

But yes, I've heard theres about 2-3bhp to be had by using the right oil in the gearbox...

Jules

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