Quote:
Originally Posted by JulianEdgar
How much for shipping what? Neither the stopwatch or accelerometer cost much, shipping included or not.
A stopwatch gives better info than a dyno because, unlike a dyno, it takes into account:
1. Real aerodynamic flows
2. Real rotating inertia within the driveline (ie unlike a dyno, ramp times precisely match gearing).
The only thing I find impossible to achieve on the road is ultra low-load tuning of ignition timing - whereas that is quite easy on the dyno.
You've repeatedly said that you can't get consistency in testing. I'd suggest that's because your testing techniques aren't very good - either in the way you do the tests or the tests you choose to do. For example, with accelerometer testing, I can easily get results that match within a few percent on consecutive runs. The tests that I suggest doing (that don't include trying to hold a constant MAP value) are highly consistent and repeatable - if they're done with care, anyway.
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Low load ignition timing was one of my main goals to test. No aero, all engine related tests. So maybe that was the problem.
I do find it hard to test around here because there are no flat roads. And straight stretches longer than half a mile are hard to find too.