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Old 12-08-2011, 11:06 AM   #10 (permalink)
oil pan 4
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Join Date: Jul 2011
Location: NewMexico (USA)
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Sub - '84 Chevy Diesel Suburban C10
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90 day: 19.5 mpg (US)

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90 day: 26.43 mpg (US)

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90 day: 11.95 mpg (US)

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Quote:
Originally Posted by pounsfos View Post
and oil pan 4,
any increase in f/e or are you still in the testing a tuning stage
The engine has less than 2000 miles on it so its not even broken in, I have some tuning to do and more parts to put on.
My next major MPG effecting part will be installing a turbo "F-code" intake manifold. I will be replacing my prized "J-code" intake which as proven its self to be a good set up for fuel economy. The F-code intake will be put on so I can play with water injection and so I can install a turbocharger later on.

EGT readings tell me more heat is going out the exhaust compared to the old engine so I need to advance the timing a little bit. I had to track down a special tool to properly check the timing.

So far my highway milage was looking good at 21mpg considering I had the truck loaded up with tools and parts, had a 24 foot aluminum lader strapped to the roof and was pulling my trailer.
Being down 4 to 5 mpg compared to being empty with nothing on top or being pulled behind is looking pretty good. I also had brandnew 31'' yokohama AT-S tires installed right before my trip.
I expected my fuel milage to be in the high teens for that trip.

An aluminum lader has to be the worst thing you can put on a truck for aerodynamics, I could hear nothing but wind noise coming off that lader any time I got above 50mph.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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