Vehicle & Technical > Defender

Standard 300tdi intercooler

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Magnum335:
I speak form experience when i say intercoolers and pump tweaking DO increase fuel economy, although all of what ian has said is correct, what about the ability to shift up earlier?
Why have i experienced nearly a 5mpg increase in fuel economy? Bearing in mind i drive very gently, and tootle along at 50-55.

mmgemini:

--- Quote from: "barnyfarmer" ---I speak form experience when i say intercoolers and pump tweaking DO increase fuel economy, although all of what ian has said is correct, what about the ability to shift up earlier?
Why have i experienced nearly a 5mpg increase in fuel economy? Bearing in mind i drive very gently, and tootle along at 50-55.
--- End quote ---


That's what I have found as well.

Magnum335:
I dont think its a direct corelation of less throttle but more diesel...
Glad i'm not the only one mike!!!

Guardian.:
must be just me then!
if your not going to use the extra power, why tune it?
i know the engines are factory set to give best emision figures etc, so tweaking can improve mpg to a small degree, but when people go on about tuning, they generaly mean 'go faster'.

Porny:

--- Quote from: "barnyfarmer" ---I dont think its a direct corelation of less throttle but more diesel...
Glad i'm not the only one mike!!!
--- End quote ---


Why not??

On a mechanical pump you tweak the settings so you get more fuel at lower boost presure settings/throttle positions..

Hence why you rotate the diapraghm, adjust the starwheel etc etc... so that you get more fuel at lower boost, or more fuel at less throttle.
Ultimately with a tweaked pump the overall amount of fuel injected is increased/altered thorughout the full range of throttle openings.

Which means for a set speed, the amount of throttle needed will be less... as you will be putting in more fuel than before.  And more fuel on a diesel equals more power.
 


Ian

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