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Old 05-22-2011, 10:45 AM   #1 (permalink)
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The really slow shift

I often find slow traffic ahead of me prevents me from accelarating anywhere near best BSFC. There are two usual ways of coping with this: less load and shifting at lower revs. Both of thease sacrifice efficiency.

Lately however, i have been using a third method: coast a bit between gears, this alows more efficient acceleration at the same average rate.

In reality, of course, it's a compromise - you can't be too jerky in dense traffic.


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Old 05-23-2011, 03:01 AM   #2 (permalink)
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I've been doing something similar since about a year ago: If I usually shift to 4th around 50km/h, but traffic ahead is accelerating so slowly that I'd have to stay in gear for a while, then I accelerate in third to ~60km/h, coast down to 50, and then put it in 4th.
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Old 05-27-2011, 12:34 PM   #3 (permalink)
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kinda like a pulse and glide acceleration
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Old 06-02-2011, 11:33 AM   #4 (permalink)
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I just got my Cruze Eco and have been shifting really slowly, never allowing it to go above 2000 RPM's. (Unless I am in the mood for speed, I know, not eco friendly, but I gots to scratch the itch sometimes.)

Anyway I was reading this thread and not quite sure how to do the calcualtion for best RPM range. I also have some questions, as this is my first manual.

The engine is a turbo, does that make a difference in what is the optimum RPM to shift?

Gear ratio is:
■First Gear Ratio - 4.27:1
■Second Gear Ratio - 2.16:1
■Third Gear Ratio - 1.30:1
■Fourth Gear Ratio - 0.96:1
■Fifth Gear Ratio - 0.74:1
■Sixth Gear Ratio - 0.61:1
■Reverse Ratio - 3.82:1
■Final Drive Axle Ratio - 3.83:1

Any suggestions on how to optimitly shift. I have driven a few manuals before, but never with this ratio and never with the intent to achive better MPG. Any advice would be welcome.

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