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Old 22nd December 2012, 11:17   #16
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Default Re: Is power/weight all that matters?

The power/weight ratio is just like the Ghz of a computer processor. Matters for performance, but it is not the only thing that matters.

In two words, it's marketing strategy that there is so much fuss about power/weight ratio.
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Old 23rd December 2012, 22:02   #17
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Default Re: Is power/weight all that matters?

@Accelerate, when you say feels quicker - as in the Verna feeling quicker than the Linea, did you do this comparison starting from rest, giving it all it can acceleration, or was it already on the move - then press pedal (or maybe downshift , then accelerate ) ?

P:W ratio only measures the peak - which you can avail of only at 5 speeds, the shape of the rest of the torque curve is important. A very peaky engine, with a high sudden peak with significant drop in torque above and below that RPM , will show a high power to weight ratio, but an engine with somewhat less peak power/torque but a wider useful RPM range over which it makes over 90% of max torque, will be quicker despite lower power:weight ratio. This is very rare of course, most engines have sufficiently wide band around the peak torque/power to have 1500-3000RPM bands that will make you smile , but I'm talking more out of observation with petrol engines. Diesels tend to have more narrower rev ranges.

So, it would be great to get the power/torque curves of the said cars, the gear ratios and know the effective output (after transmission losses) to get a better understanding of why the Linea was slower even with similar P:W ratio. I might be simply down to turbo-lag, since most engines for general consumer use are not tuned for high performance over narrow powerbands.
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