rolling rd, wheels or fly wheel????
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The wheels. The 'flywheel' figure is a best guess, at best. The 'wheels' figure isnt that reliable either, being massively affected by other factors: transmission temperature and tyre pressure to name but two...
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Also just to add - after measuring the power at the wheels some use the run down to estimate the transmission losses to arrive at the flywheel figure.
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Because the lower pressure they are, the more rolling resistance they have, soft tyres reduce the at the wheel numbers.
A rolling road can only measure at the wheels numbers, from that flywheel figures can be obtained my a number of methods...
1/ %age guess - pretty poor and out of date these days
2/ Prior experience, test a number of stock cars, assume they produce the stock power curve and create a loss V speed table.
3/ measuring loss by driving the car (in neutral) the problem is that friction in transmission changes with load due to the side loads on the bearings, shafts bending slightly etc.
Simon
A rolling road can only measure at the wheels numbers, from that flywheel figures can be obtained my a number of methods...
1/ %age guess - pretty poor and out of date these days
2/ Prior experience, test a number of stock cars, assume they produce the stock power curve and create a loss V speed table.
3/ measuring loss by driving the car (in neutral) the problem is that friction in transmission changes with load due to the side loads on the bearings, shafts bending slightly etc.
Simon
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