I thought the knowledgeable would know all of this especially when pipes are being designed... even a skilled operator can't compensate for some of the failings of dynojet's stuff because it simply isn't able to perform in this way.
Inertia dynos are good for peak power testing - but even then it is based on a few 'estimated' perameters set by the machine. It doesn't measure but gives you a reading based on calculations of 'rough figures'
For me it is too inaccurate and frankly - if you are developing something or setting up something that needs a lot of attention then you need a braked dyno.
I found this when I started seriously developing the YPVS engine - after spending over £3k on the engine alone you need accurate measurements to see what each subtle change has on the engine. You can't do this with an inertia dyno - by design it can not accurately give you the information because of the way it delivers the information to you.
So, christ only knows what Andy's bike is actually producing or responding to the pipe development.
I came to these conclusions over a year ago and have only recently understood why I was getting odd readings from dynos thanks to some helpful people.
Again, if you are happy with how you are doing your development then carry on but if you want to do it accurately and realistically, dynojet ain't the kit
Whoops - the important techie stuff..
http://www.factorypro.com/dyno/true1.html
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