Quote:
Originally Posted by Madact
but I'm thinking A-B-A testing at cruise won't really show up header differences very well w.r.t. torque curves etc.
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I managed to draw this graph showing %torque increase of my tri-Y header over the standard header with pre-cat in the manifold just by timing the cars acceleration to each 250rpm over a few runs before and after using a camera in video mode - the timing is accurate to the video frame rate of 1/30th second which is good enough:
I didn't have a way of measuring fuel flow so that was as far as I got but if you have a flat piece of road that you can play on then I think a DIY approach is likely to give a more satisfying result than a dyno. Obviously you can do more than one throttle position simply by putting a stop at half throttle or whatever and that probably tells you all you need to know. What you are really interested in is how much does it improve your MPG in normal driving conditions and that can't be measured on a dyno.