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Re: Latest dyno run results on the Dynojet system (archive)
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Posted by Todd Kenyon on February 08, 2002 at 16:55:31:

In Reply to: Latest dyno run results on the Dynojet system posted by Sheldon on February 08, 2002 at 15:20:34:

Sheldon - I would think that it could reflect the dithering of the ECU and O2 sensor in closed loop, but rpms range may be too high for that. First dip might also be the spot where the AFM flap hits wide open and the ECU starts ignoring it, supposed to be around 3500 rpm.



Here are the results of my latest run. Motor is stock except for the Jim C chip. Little disappointed with the HP. If you figure 15% drivetrain loss, I'm only at 260Hp at the crank. I'm also running premium fuel with probably 10% ethanol in it (mandated by state of MN). How much affect do you think the ethanol would have on power?
Any idea why my Air/Fuel Ratio is bouncing all over the place? Is this a characteristic of the flapper style AFM?




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