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Old 03-31-2017, 12:42 AM   #1 (permalink)
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Low RPM load limits? Lugging?

What load limits do you use when you are at low rpms? I find that below 1500 rpm, operating at too high a load makes the engine sound and feel rough, which I assume is nearing the lugging point.

idle-1300: 40% load(sometimes a little more)

1300-1400: 50% load

1500-infinity and beyond: No limits

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Old 03-31-2017, 01:03 AM   #2 (permalink)
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Below 1500 is probably always too low for flooring it for any purpose at all. But above that, in a naturally aspirated and relatively low-power engine that is also in good working order, there is not much chance of damage. ECUs will adjust timing and AFR as needed to avoid pre-detonation. Nonetheless, 1500 is my absolute bottom for relatively high load (75%, which is a long way from WOT). But generally I am at 1700 or higher as I accelerate. Been doing this for years all the time and have 248,000 miles on the original engine now.

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Old 03-31-2017, 02:08 PM   #3 (permalink)
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In my Insight, the engine feels fine wide open down to maybe 1200rpm. At those low revs, even barely touching the pedal is enough to give it 100% load, because it needs so little air.

Edit: Recently passed 220k and it still runs like a brand new engine.
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Old 03-31-2017, 07:56 PM   #4 (permalink)
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Drive by wire throttle won't let you do anything that's bad for the engine, IMO.
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Old 03-31-2017, 08:04 PM   #5 (permalink)
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For my 8L engine build I would like to cruse along at 70mph turning 1,400rpm. If the engine doesn't like that I will have to change rear end gears.
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Old 04-01-2017, 12:20 AM   #6 (permalink)
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Quote:
Originally Posted by Daschicken View Post
What load limits do you use when you are at low rpms? I find that below 1500 rpm, operating at too high a load makes the engine sound and feel rough, which I assume is nearing the lugging point.
Not nearing . It is the indicator of lugging. Roughness is lugging beyond what the computer is able to maintain smooth operation.
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Old 04-01-2017, 01:25 AM   #7 (permalink)
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Number of cylinders and/or displacement count, imo.

My 3 cylinder Geo isn't much good under 2000rpm at heavy load, whereas my wife's V6 happily chuggs down the the highway at 1500rpm. My Miata (read: DOHC/high-revving) is a turd below about 2500 rpm.
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Old 04-01-2017, 11:13 AM   #8 (permalink)
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That guy does such great tutorials. My head feels funny, did I just learned something?!!
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Old 04-01-2017, 02:01 PM   #9 (permalink)
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Have I missed something here? All the BSFC graphs I see seem to show that the engine is less efficient at low RPM & higher load.
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Old 04-01-2017, 02:24 PM   #10 (permalink)
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