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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. :turtle: |
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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kinda like a pulse and glide acceleration
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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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