P&G acceleration rate and top speed advice

[GasSavers_maximilian]

Came up with a better way to look at the data than just the raw numbers. This is a graph, by throttle, of the various min and max speed ranges. I had to hand edit in the horizontal axis labels, which was a pain. I haven't had time to interpret it yet. Should be easier to spot errors stemming from data collection inaccuracies.



Bigger version.

[GasSavers_maximilian]

Here's the same thing for my pulse and DFCO data. I considered trying to combine them, but I think it'd be too tangled. Definitely data problems at those discontinuous spikes.



Bigger version.

[GasSavers_maximilian]

Originally Posted by maximilian

Definitely data problems at those discontinuous spikes.

Or it's just where the speed ranges experience a discontinuity. Duh.

[GasSavers_maximilian]

Had a second to look at the graphs and realized I should really separate all the speed ranges for each throttle for clarity. Be a lot of work, so I probably won't bother since I've learned to deal with it.

Anyhow, the economy that can be obtained from pulse and DFCO in the 45-50 range seems to be greater than 50 mpg and since it'd work better than P&G in higher traffic situations I can see a real use for it. The TPS=70 curve is probably flawed at that point since it's so much higher, but economy isn't that sensitive to exact throttle, which would make it easy to do in practice. The peak at the 35-40 range will work well in town.

Still need to process the data from the hi-lo pulse system (need a good name for that).

[FrugalFloyd]

Very confusing graphs. I can't tell what gear you were in for which tests.

When you analyze your data, I'll bet you're going to find out your best P&G mileage will come from 1500-2000 rpm pulsing in each gear, at moderate throttle (about 75 LOD).

[GasSavers_maximilian]

Fifth gear for everything, only the throttle and speed range varies. It's really got four dimensions and graphing that would be tough. I could've produce a 3d map for each throttle, but I found excel's 3d graphing pretty wanting (at least on osx).

[FrugalFloyd]

Using fifth gear, you're testing both P&G, and air resistance. You'll find fourth gear testing to be purer, since air resistance largely disappears as a factor. The 4th gear 25-40 mph delta really works miracles with my two cars, bringing their mileage from the 40 mpg area to the 60 mpg area at the same average 28 mph speed. Low speed P&G fits most city and small town driving conditions best.

5th or 6th gear P&G only improves my mpg about 5 mpg on a long trip. I suspect I could do about the same with cruise control, if I had the nerve to cruise on highways at 45 mph.

[GasSavers_maximilian]

I can accelerate from 25 in fifth gear if on a level. I've been meaning to do level travel speed vs mpg for fourth gear at some point to see if I can explore the local minimum that occurs at 40 mph in fifth.