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Old 08-08-2017, 08:06 PM   #11 (permalink)
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Yeah can't blame you there. I don't know the last time I had my car past 4k rpm. My Jeep I redlined constantly because it liked it lol burnt less oil and idled better after being beat on.

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Old 08-09-2017, 08:20 AM   #12 (permalink)
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BSFC always happens below peak torque, so I don't think you should be revving past 2500ish.
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Old 08-09-2017, 08:55 AM   #13 (permalink)
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2500 is my normal driving change up point. Even before I tried driving for fuel efficiency changing there just felt right. Starting on a really steep hill I'll take it up to 3500 or thereabouts.
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Old 08-09-2017, 03:02 PM   #14 (permalink)
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I'd stay between 2000 and 3500 while accelerating.
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Old 08-09-2017, 06:44 PM   #15 (permalink)
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Well, if we truly want to save as much gasoline as is humanly possible, we should probably rpm match while upshifting. The below chart was made for this Honda Jazz 1.4L:

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Old 08-10-2017, 04:01 AM   #16 (permalink)
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Quote:
Originally Posted by JockoT View Post
I have the Power/Torque curve here.

That's just a software generated curve extrapolated from the car stats. Not entirely useful.

You want an actual dyno.

Have one here for the 1.3 iDSi... slightly bigger than your 1.2 (AFAIK, they sold the iDSi in sizes up to 1.5), but should be similar enough:

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Old 08-10-2017, 04:31 AM   #17 (permalink)
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Great curves. The 1.2 litre does develop its torque at lower revs than the 1.3 and above. Seemingly it was developed that way. It is a wonderfully smooth and flexible little engine.
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Old 08-10-2017, 04:34 AM   #18 (permalink)
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Well, if we truly want to save as much gasoline as is humanly possible, we should probably rpm match while upshifting.
As far as I can see, the 1.2 Jazz has the same gearing.
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Old 08-10-2017, 09:15 AM   #19 (permalink)
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Second gear can take me up to 50mph, good enough for everything but a highway. Yes, the upper end of the tach is less efficient, but I'm out of it and into fourth or fifth immediately.

There's a lot of overall efficiency to be gained from one hard pulse versus a few less hard pulses.
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Transmission type Efficiency
Manual neutral engine off.100% @MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%

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Old 08-10-2017, 12:43 PM   #20 (permalink)
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Gave rpm matching a try this afternoon, and it seemed to work well. I had a great Hypermiling run, along my favourite coasting road. It is like a roller coaster, for mile after mile, with some tight bends which need a bit DFCO. I was in the car myself, so I could throw it round the corners in a manner that would alarm my usual "navigator". The last section is brilliant. You crest a rise at about 20 mph, use a bit of DFCO into the first two bends then stick it in neutral. You are soon doing 60 and it carries you right into town. It finishes with an ascent to the 30 mph zone and the speed bleeds of perfectly. As you pass the signs the road resumes level, and it is just a case of 5th gear and that's you. I love that road. It is about 3 miles longer, but as well as the coasting it drops me almost at my flat, with virtually no town traffic.
A great day out!

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