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Old 03-01-2012, 08:49 AM   #1 (permalink)
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Lugging

I have a question regarding lugging while P&Ging.

Most of my commute is on roads with speed limits in the 30-40 mph range.

When there is no traffic behind me, I will generally glide down to close to 30 mph, which is about my minimum 5th gear speed (V-6 ranger, 5 speed stick).

If I extend my glide a little to long or have some sort of uphill, I sometimes get into the lug zone a bit. I can stay in 5th, with very light throttle and accelerate very slowly, smoothly, or I can momentarily drop to 4th or sometimes 3rd, accelerate hard and be back into 5th fairly quickly.

Which is better?

Do I burn more fuel putting up with a few seconds of very light throttle to nurse it out of the lug zone or should I go to a lower gear where I can go to a more efficient 80% throttle.

I do not have a scan guage, unfortunately.

Does anyone have a BSFC graph for the vulcan 3.slow V-6?

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Old 03-01-2012, 10:46 AM   #2 (permalink)
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I'd suggest downsifting anytime you're lugging. You don't have to keep the rpms THAT low.
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Old 03-01-2012, 11:08 AM   #3 (permalink)
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Also: get a scangauge! It'll pay for itself. (And you can always re-sell it later.)

Note there are less expensive options than the full SG 2, such as the ScanGauge E and the UltraGauge.
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Old 03-01-2012, 12:03 PM   #4 (permalink)
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Quote:
Originally Posted by Daox View Post
I'd suggest downsifting anytime you're lugging. You don't have to keep the rpms THAT low.
that's the thing. I'm at a point where I am not really lugging at low throttle inputs, but am if I step on it.

i am guessing that downshifting probably does make sense in this case, as fuel efficiency just above lugging, probably ain't anything to write home about.

i 'spose a little extra left leg exercise is good for me, anyway and doesn't really cause much extra wear.
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Old 03-01-2012, 12:25 PM   #5 (permalink)
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What rpm are we talking about? I like to run mine fairly low, pulsing from 1300 rpm on up. What's efficient is 80% LOAD, not throttle. At very low rpm, that load level comes with the throttle just above idle.
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Old 03-01-2012, 01:48 PM   #6 (permalink)
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Not really sure what the revs are, as I have no tach. Interesting point about the difference between load and throttle position. I wasn't aware of it.

I 'spose I will modify my p&G technique a bit and incorporate 3rd/4th gear a bit.
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Old 03-01-2012, 01:50 PM   #7 (permalink)
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Pete -

Quote:
Originally Posted by pete c View Post
that's the thing. I'm at a point where I am not really lugging at low throttle inputs, but am if I step on it.
Happens to me all the time. I downshift if I need to accelerate quickly. If I need to increase my speed and I can take my time then I am super-gentle on the throttle until I get out of the "lug zone".

Quote:
i am guessing that downshifting probably does make sense in this case, as fuel efficiency just above lugging, probably ain't anything to write home about.

i 'spose a little extra left leg exercise is good for me, anyway and doesn't really cause much extra wear.
Me too.

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Old 03-01-2012, 02:12 PM   #8 (permalink)
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I think the art of driving efficiently has more to do with how you decelerate and what you do with your velocity once you have it than how you accelerate. Use a gear that allows moderate acceleration and a throttle position that is just backed off of where adding more does not increase acceleration rate. That is about as good as you can do without instrumentation.

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