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Old 08-17-2008, 07:50 PM   #9 (permalink)
AXMonster
British Ecomod Hypermiler
 
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Join Date: Mar 2008
Location: South Coast, England
Posts: 101

The AXe - SOLD - '97 Citroen Citroen AX 1.1i 5 Door
90 day: 46.78 mpg (US)

Foci - '03 Ford Ford Focus Tdci Ghia Estate
90 day: 64.37 mpg (US)
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Quote:
Originally Posted by MechEngVT View Post
In a diesel engine a constant throttle position means a constant volume of fuel is consumed per revolution. Only an engine RPM change will change your fuel used in GPH.
Not in my diesel!
My focus is fly by wire throttle. The fuelling is determined by throttle %, engine speed and vehicle speed. The fuelling is further limited by the air density limit map, which is relative to boost so smoke is reduced to reasonable levels.

There are 4 throttle position and engine speed maps, with vehicle speed interpolating between these maps.

Oh, and there's a temperature dependant map too plus lots more

So, no. There is not much correlation between throttle position and fuelling unless the conditions are exactly the same.
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1997 Citroen AX 1.1i SPI
2003 Ford Focus 1.8 Tdci estate
Ecomods: See my garage



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