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Old 02-19-2013, 03:57 PM   #11 (permalink)
Do more with less
Join Date: Jul 2010
Location: North Eastern Missouri
Posts: 913

OD - '05 Ford Econoline
90 day: 18.64 mpg (US)

Joetta - '86 Volkswagen Jetta Turbo Oil Burner
90 day: 49.71 mpg (US)

Benzilla - '85 Mercedes Benz 300D
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I have to agree, I clock about 5 psi at 60 and 9-10 at 70. I have the waste gate set a bit high at 14 and drive it at a max of 12 psi. It will pull 14 psi at half throttle. I need to get an EGT.

By contrast my vw TD gets 2-3 psi at 60.

Originally Posted by oil pan 4 View Post
When I put a turbo on my diesel I picked up at least 2 to 3 mpg on the highway. And that's comparing driving 55-60 when N/A to +65MPH w/turbo.

Diesel engines are nice because the more air you can cram into the cylinders the better the fuel economy and power out put will be.
If you had a boost gauge you may see why there is a fuel economy jump at the higher speeds. At 60 the turbo maybe under such light load it may not be kicking out any boost, at 65 you could be developing 1 or 3 PSI and that small change can make a lot of difference.

Water injection
Water injection can raise the boost? I thought it was to lower the combustion temp.

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