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***HDi fun*** · 11-07-2008, 07:46 PM

I think you're slightly amiss on the turbo behaviour, it should be providing boost almost from idle in a modern diesel. By 3000rpm you're on the way to changing up really.

A remapped car generally has better economy under gentle driving because part of the remap process is to optimise everything across the whole range, not just foot to the floor driving.

Basically they can ensure that there's enough air available to burn the fuel that's injected. Bear in mind that diesel engines are regulated by FUEL ONLY. So on light loads they run on excess air anyway.

A remapped diesel feels better under all driving conditions than a standard car in my opinion. Before mapping mine it averaged 36mpg over 20,000 miles. Over the last 50,000 miles with the custom map it's averaging 40.3mpg.

You really don't need a switch.

11-07-2008, 07:46 PM	#12 (permalink)
*HDi fun* Moderator Torque Junkie Car: Peugeot 406 Join Date: Apr 2006 Location: SOUTH EAST Posts: 2,475	Re: ecu remap I think you're slightly amiss on the turbo behaviour, it should be providing boost almost from idle in a modern diesel. By 3000rpm you're on the way to changing up really. A remapped car generally has better economy under gentle driving because part of the remap process is to optimise everything across the whole range, not just foot to the floor driving. Basically they can ensure that there's enough air available to burn the fuel that's injected. Bear in mind that diesel engines are regulated by FUEL ONLY. So on light loads they run on excess air anyway. A remapped diesel feels better under all driving conditions than a standard car in my opinion. Before mapping mine it averaged 36mpg over 20,000 miles. Over the last 50,000 miles with the custom map it's averaging 40.3mpg. You really don't need a switch.