03-29-2014, 11:30 AM
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#11 (permalink)
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It's really simple. Pick your target speed, downshift until you can maintain that target speed. Use the highest gear that you can to maintain that speed.
That's it.
regards
Mech
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03-29-2014, 11:56 AM
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#12 (permalink)
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well there IS such a thing as lugging, but it is down by idle speed. The journals need a certain rpm to distribute the oil all the way around them before it gets squished out. Also bsfc peak will fall either side from 2500 rpm, though most bsfc charts seem more sensitive to changes in load vs rpm. So too lightly loaded and too high rpm is a double efficiency whammy.
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03-29-2014, 01:20 PM
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#13 (permalink)
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I watch the engine load on my scangauge, and will downshift on long grades if it's over 75% or so. Obviously I don't have as much rev range in the diesel, so I'd probably want 3rd for a hill that steep.
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03-29-2014, 08:26 PM
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#14 (permalink)
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The original posted to this thread is doing 2500 rpms in 5th gear at 22 mph up a 7% grade?  Yeah, hes more problems than lugging, oil psi and water circulation.  |
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03-29-2014, 09:44 PM
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#15 (permalink)
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I missed that, He has to be doing a lot less than 2500rpm @ 22mph in 5th. folks report 65mph @3k(ish) in a civic, putting the rpm around 1015 with load
WARNING TOO LOW RPM FOR SUSTAINED LOAD!!!
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03-29-2014, 10:04 PM
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#16 (permalink)
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The OP also mentioned driving 22 MPH in a 50 MPH speed limit. That sort of speed differential is downright dangerous, in addition to being rude.
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03-29-2014, 11:13 PM
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#17 (permalink)
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In West Virginia is common to see a line of Cavilers in the far right lane going 20 mph on most climbs. The middle lane has the big trucks. The left lane has me pushing 15 psi of boost doing 75 mph and 16 mpg. Most speed limits are 70. Most people go 80.
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03-30-2014, 12:23 AM
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#18 (permalink)
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What brake pedal?
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Quote:
Originally Posted by Cobb
In West Virginia is common to see a line of Cavilers in the far right lane going 20 mph on most climbs.
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Ever driven Route 50 through WV?
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03-30-2014, 09:36 AM
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#19 (permalink)
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Quote:
Originally Posted by digital rules
Ever driven Route 50 through WV?
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Many times. That route was the source of legislation that made it illegal to coast in neutral in Virginia, enacted in the 1930s when Plymouth came out with "freewheeling". Problem was you could not engage-disengage it unless you were stopped, which combined with the brakes of that era meant melted brakes and a trip over a cliff.
Ever seen the freeway to nowhere in West Va?
regards
Mech |
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03-30-2014, 01:56 PM
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#20 (permalink)
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I just follow my gps. If this is the road with a toll booth every few miles, then yes. Its well worth the toll for a nice stretch of road to travel and plenty of spots to do a 0-70 run.
Quote:
Originally Posted by digital rules
Ever driven Route 50 through WV?
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