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Old 05-04-2009, 06:46 AM   #6 (permalink)
EcoModding Apprentice
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Join Date: Apr 2009
Location: Sheffield, England
Posts: 142

Eddles's Astra - '01 Vauxhall Astra ECO4
90 day: 61.03 mpg (US)
Thanks: 41
Thanked 3 Times in 2 Posts
I see what you mean, but reading the Haynes manual for my car (found here) and when explaining how the fuel injection system work, one section says:

"A turbocharger is fitted to increase engine efficiency by raising the pressure in the inlet manifold above atmospheric pressure. Instead of the air simply being sucked into the cylinders, it is forced in. Additional fuel is supplied by the injection pump in proportion to the increased air intake".

Note "Additional fuel". That's not quite what we want? BTW the Haynes manual mentions the compression ratio for this engine is 18.4:1 even though it is direct injection.

Thanks for your help, much appreciated!

My aim: to achieve 3L/100km.
Best tank @ 65mph: 864.2 miles 69.36MPGus 3.4l/100km
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