How Fast To Accelerate? - Fuelly Forums

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Old 09-07-2007, 06:55 AM   #1
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How Fast To Accelerate?

Hi Folks,

Is there a general consensus about whether to accelerate slower or faster? On the scanguage, should I keep flow rate below some arbitrary number, and accelerate more slowly, or should I kick it and just keep below the "Open Loop" threshold? Somewhere in between?

Thanks!

Joe
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Old 09-08-2007, 08:16 PM   #2
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I'm still hoping that someone will answer my question.

I've been experimenting with very gentle acceleration, and this seems to be fairly fuel efficient. however, other folks have mentioned stepping on it, and getting up to steady state as fast as possible without going into open loop. Any thoughts? In your experience, what works best?

Tomorrow I will do some measurements of time to go from 0 to 100 km/h at different fuel flow rates. This should give me the ability to calculate the actual amount of fuel used at different rates of acceleration. I'll post my results.

Thanks!
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Old 09-09-2007, 06:23 AM   #3
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auto or manual? If its a manual I would shift at 1500 rpms or below accellerating very lightly generally 10-12% throttle. Automatic takes more time to find a happy medium. You want the torque convertor locked as soon as possible. A general guestimation would be 30-50% throttle until 40mph then allow the convertor to lock, after that accel slowly.

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Old 09-09-2007, 02:57 PM   #4
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the second gen scangauge 2a is supposed to incorporate the speed of acceleration for best fe. I just cant remember where i heard the audio interview from the ceo of linear logic explaining all the new features of the scangauge 2a
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Old 09-09-2007, 03:20 PM   #5
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It's on Cleanmpg.
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Old 09-09-2007, 07:20 PM   #6
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Measured Results

Hi Folks,

Today I found a flat stretch of road, running east to west. I did two trials each (one eastbound, one westbound) at three different accelerations. I then punched the measurements into my trusty spreadsheet, and found my answer:

If I accelerate using 5 LPH then I'm using about 50% more fuel to get to 80 KM/H than if I accelerate at 7 LPH.

Thanks for your replies. I'm going to have to figure out how to use this scanguage if you're suggesting that I can do more than see what's happening at any given moment.

Joe.
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Old 09-09-2007, 07:37 PM   #7
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Quote:
Originally Posted by J. Hartley View Post

Thanks for your replies. I'm going to have to figure out how to use this scanguage if you're suggesting that I can do more than see what's happening at any given moment.

Joe.
Go into "Trip" mode --> Current --> Average mpg

When you're ready to start a test -- press "reset"
At the end of a test, note the avg. mpg readout
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Old 09-09-2007, 07:50 PM   #8
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Cool

thanks for the info!!
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Old 09-10-2007, 07:23 AM   #9
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Quote:
Originally Posted by trebuchet03 View Post
Go into "Trip" mode --> Current --> Average mpg

When you're ready to start a test -- press "reset"
At the end of a test, note the avg. mpg readout
Now why didn't I think of that!!!??? Would have saved me a bit of work, and gave better results to boot. Thanks!

Joe
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Old 09-10-2007, 08:34 AM   #10
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no SG

I have no scangauge (OBD1 car) so I have to go by tankful. But for what its worth, I drive like theres an egg between my foot and the gas pedal. It works not sure if this is the best for even my car, but its WAY better than before
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