Free turbo rpm gauge.

Leiffi

Leiffi

New member
In Firepunks Youtube video about nitrous they said no one monitors turbo shaft speed because it is too complicated and expensive. Actually it is free if you already own a smartphone. Use Spectrogram or other similar FFT analyzer app to measure sound. Calculate full blades of compressor inducer , measure Hz , divide by full blade count and multiply by 60 to get your turbo rpm. From the screenshot attached, 8 blade HX60: 13000Hz / 8 x 60 = 97500 rpm.
 

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So, how do we select the lucky bastard that holds the phone near the turbo for data collection ? I guess a remote microphone would work.
 
Snedge said:
So, how do we select the lucky bastard that holds the phone near the turbo for data collection ? I guess a remote microphone would work.
Click to expand...

It usually works inside car/truck. That example in the pic was taken inside my truck when driving. I have also used it at pulling track spying other competitors turbo rpms.
 
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