Post by flatlander07 on Apr 15, 2008 1:49:31 GMT 11
On the grandpa mode it was me that asked that originally. That does sound a little low on mpg. Those overseas guys are getting 28 US mpg with racks and jacks and semi-off road set-ups.
How much does the Pup weigh? I want 40 to 50 US mpg with a streamlined Dakota, and it all looks plausible, but I'm slightly puzzled/worried with these mileage numbers.
However, drag coefficient is way parimount. Lifting, etc. makes mileage go down fast. I don't think your tires or ratios are bad at all. I'm going to run 3.55 ratio with 28 inch tires, and a 20% overdrive. My numbers come out to 2557 rpm at 75 mph, 2727 rpm at 80 and 2386 rpm at 70.
I'm glad to have that other guy say high speed animal over 2000 rpm, cause that's what I inferred by all my research. The brake specific fuel consumption of the 4jb1tc is among the highest available. I was at Con Expo and talked to most diesel mfg. booths, collected literature, and had some really good conversations with the top knowledgeable people from, say 2/3 of the booths. What I found out is that the 4jb1tc has better bsfc than "anything" out there. Deutz, Haatz, Cummins, Cat, Deere, Detroit, etc., etc. The only thing it gives up in BSFC is to a brand new Isuzu 4 valve dual ohc, super combustion chambers, etc. They are about 10% better...that's all. And they are bigger, and not appropriate for the vehicle size we are talking about here, and probabally have electronic everything, and not so readily burn wvo.
The bsfc of the 4jb1 is broad in the rpm from 2-3000, and very best at 2500 rpm.
How much does the Pup weigh? I want 40 to 50 US mpg with a streamlined Dakota, and it all looks plausible, but I'm slightly puzzled/worried with these mileage numbers.
However, drag coefficient is way parimount. Lifting, etc. makes mileage go down fast. I don't think your tires or ratios are bad at all. I'm going to run 3.55 ratio with 28 inch tires, and a 20% overdrive. My numbers come out to 2557 rpm at 75 mph, 2727 rpm at 80 and 2386 rpm at 70.
I'm glad to have that other guy say high speed animal over 2000 rpm, cause that's what I inferred by all my research. The brake specific fuel consumption of the 4jb1tc is among the highest available. I was at Con Expo and talked to most diesel mfg. booths, collected literature, and had some really good conversations with the top knowledgeable people from, say 2/3 of the booths. What I found out is that the 4jb1tc has better bsfc than "anything" out there. Deutz, Haatz, Cummins, Cat, Deere, Detroit, etc., etc. The only thing it gives up in BSFC is to a brand new Isuzu 4 valve dual ohc, super combustion chambers, etc. They are about 10% better...that's all. And they are bigger, and not appropriate for the vehicle size we are talking about here, and probabally have electronic everything, and not so readily burn wvo.
The bsfc of the 4jb1 is broad in the rpm from 2-3000, and very best at 2500 rpm.
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