NissanDiesel

philip1 · Posted: Tue Aug 11, 2009 9:33 am Post subject: what's the best RPM to cruise

I'm looking at this from a fuel milage standpoint so heres the question. Is it better to cruise at the torque peak or stay below it?

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Phil
1981 HL510 (in WA)
I will be installing a diesel in this thing

Bob Drucker · Joined: 14 Jun 2009 Posts: 6 Location: lake co california

I have been told that the lowest rpm that a internal combustion engine can pull and still keep the vehicle moving at the wanted speed with out surging or shuttering will give the best mpg. The less you use- the better the mileage. comments?

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roverdiesel

kassim503 · Posted: Wed Aug 12, 2009 5:09 pm Post subject:

i would say the best mileage achieved would in a diesel is whatever rpm results in the least amount of pedal down. Will say nearly the same for a gasser as well

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'83 maxima sedan, l24e, a/t, black

227K

asavage · Posted: Thu Aug 13, 2009 8:33 pm Post subject:

ocd · Joined: 10 Jun 2006 Posts: 69 Location: Portland, OR

do we have brake specific fuel consumption data on the sd22?

IIRC many diesels use the least amount of fuel when producing the most amount of torgue. so some would say that cruising speed should be just above peak torgue so when a climb begins rpm's drop and torque increases therefore ascentablility is maintained. on a 6.2/6.5l gm/detroit diesel brake specific fuel consumption is least at peak torque at 1850rpms

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-Noah

i deliver blends of biodiesel -no more!.

82 datsun 720 KC w/sd22
85 volvo 760gle sedan turbo diesel
85 peugeot 505s wagon turbo diesel & parts car
83 chevy k20 suburban silverado 6.2 n/a diesel

kassim503 · Posted: Thu Oct 29, 2009 6:17 pm Post subject:

Thanks for clarifying that idea Al, I wasnt really thinking of rpm's which is a major factor in fuel consumption

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'83 maxima sedan, l24e, a/t, black

227K