MPG vs Boost - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 01-11-2008, 08:38 AM Thread Starter
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MPG vs Boost

I am still new to the turbo diesel world and want to ask a stupid question.

Do lower boost levels increase MPG?

The primary function of the turbo is to increase displacement and to my mind it thereby increases fuel consumption at the same time. However, what I don't know (I don't have gauges) is whether the turbo creates boost at cruise or only under acceleration. If the turbo boosts at cruise would the loss of power resulting from lower boost levels result in higher MPG or would it just make the engine work harder and thereby consume the same or more fuel?

If the two are related then could a boost controller could be used to lower boost during unloaded cruising and raise MPG then raise boost when needed for power?

I'm getting 15mpg average right now and have ordered a FBD exhaust to help open it up.


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post #2 of 4 Old 01-14-2008, 06:14 AM Thread Starter
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Well since that question didn't go anywhere; I got the FBD exhaust and put it on Sat. I had a few problems (none of which were related to the kit) because my factory hangers were removed by whoever put the last set of pipes on the truck. All in all, it took about three hours and some head scraching.

It is sic. I wasn't really expecting much of a difference because I was already straight piped with duals. If I would have realized how much breathing room it needed I would have done this a month ago. It isn't much louder than before. But, the sound itself is quite different. Also I left the 3" section long and let it extend into the 4" by about a foot. I did this to allow it to act as something of a resonator and settle the exhaust pulses and tone somewhat. I'm not sure what it would have sounded like otherwise. But, the tone is pretty smooth. The turbo is a bit louder and either it is coming in sooner or I just couldn't hear it that early before. We'll see on the MPG improvement.

Great system - Thanks Gus


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post #3 of 4 Old 01-14-2008, 06:38 AM
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I am ignorant as to what an FBD exhaust is, could you clue me in?

1996 F-250--Stock (at least for know
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post #4 of 4 Old 01-14-2008, 06:45 AM Thread Starter
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