Really? So... They use noise to measure RPM and from that, they measure Horsepower? Lolerikejw wrote:My assumption is that they use much more data than noise. The noise will measure the exact rpm(with FFT, math) during acceleration at every moment in time. Knowing the exact change in rpm and gearing(or measured speed with laser) gives speed differentials at different moments and knowing the weight gives a very good kw value. Throw in estimated or real drag levels and your calculations will be close to reality. This is a simplistic view, more data will give even better figures.

FIA probably use it mostly to detect engine anomalys, weird speeds(excess acceleration), so they can look into why.

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