ORIGINAL: grbaker
I had a bellmouth from another pipe that worked for one of them and I modified the carbon fiber tailpipe inlet from a Eurosport for the other.
You will need to experiment with your pipe to turbine spacing to get the most gain. It will probably be more like 30 to 40 mm.
Any close-up pics of that bellmouth available?
I'm trying to get my head around how to design/build one.
I guess it's not much more than turning up a wood/aluminium blank on a lathe, then panel-beating some stainless shim material into shape using the blank, and finally spot-welding that 'trumpet' onto the front of the tailpipe.
Again - thanks for your input. It is priceless and much appreciated...
BJ