Quote:
Originally Posted by AmuroRay
I got the last run and my run files - Look at that B58 like powerband.
n55david - question is the conversion from wheel speed to RPM a 1:1? he didn't use a RPM hook up, just measured it based on wheel speed.
I checked my spedometer vs the rpm, and it's pretty close. IE 80mph is about 4000RPM (+/- 200rpm) in 4th
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Yeah its pretty close as long as there isn't any weird calibration issues on the dyno. So it should give you a rough idea on rpm like you're thinking.. tire diameter/gesring/trans etc all would need to be factored to get the actual rpm but yeah.. should be close if you just check mph vs rpm on the road.. don't forget your displayed mph is off on bmws, so 82mph displayed is roughly 80 or just over 80 actual.
The problem.with not using rpm is that the software has to figure out torque based on acceleration over time and that's backwards.. so yeah you can get goofy torque numbers again if the dyno isn't calibrated properly etc