Allautos wrote:I have struggled at times like you but you do start to see things as your experience grows, I biggest aid to verifying problems was the use of some very handy soft ware that has been written by Rod Maher you can watch it it on this link https://www.youtube.com/watch?v=7LFwm_4 ... e=youtu.be
You can contact Rd through his web site http://www.scandata.com.au
I have attached my interpretation of the events within the exhaust system of a straight 4 cylinder engine which is far easier than looking at a "V" configuration. There appears to be characteristic troughs in the waveform that I hope I can attribute to valve overlap, but I need more experience and time to confirm these events.
I have attached a comparison made whilst testing the Mazda above using both WPS and First Look in the exhaust system.
Whilst there is a timing offset, they match pulse for pulse.
Looking at the image in my previous post above, if the exhaust valve opening times are correctly marked, then the First Look Sensor would appear to respond with a positive pulse for a positive pressure wave.
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