Quote:
Originally Posted by Cd
What would be the proper way to test a car too old to use a ScanGuage and no cruise control ?
By the way, I use a SuperMID .
|
The SuperMID has a "resettable average" fuel consumption function, I assume. You need that.
Without cruise control, you're likely to suffer from more variability in your runs (both speed & fuel consumption), especially if your test route isn't flat & devoid of other traffic (aero effects). You'll see just how much variability there is after you do your first set of "A" runs. If your fuel consumption figures are grouped very tightly / consistently in the set of runs, it may suggest you've got a steady foot.
Does the SuperMID also have a resettable average speed display? You could monitor how accurate your foot is, if it does.
If you're only testing aero mods, you could get around this problem by just doing coastdown testing. It's perhaps not as satisfying as seeing actual MPG figures, but you'd still get a relative indication of whether a mod has any impact vs. coastdown runs in the "control" state.