11-04-2014, 07:41 PM
Yeah, echoing mostly from what others have said... The way I've found to get good efficiency out diesels is to allow them to rev slightly, but don't labour the engine... Sitting with the engine going into antistall to tug you along is still increasing the injection quantity.
Remember *power* is made of two components, RPMs and Torque - if that confuses you, then think about smashing a nail with a small hammer, lots of times a second, or twatting it with a massive sledgehammer once or twice - that's the difference between torque and RPM..
You use fuel to make torque, and technically injecting more frequently (i.e. more RPMs) will use less fuel than injecting lots, less frequently... These engines were designed to be at their most effective at using the least amount of fuel to generate the most power at around 2000rpm... Sitting at 1000rpm asking the engine to tug round the car isn't an efficient way of doing it.
From my experience, let the engine just spin slightly faster, don't press your foot any harder, if anything almost release your foot as revs increase... Don't let the engine "chug" at low RPMs, that's the ECU correcting thinking you're about to stall, uses loads of fuel...
EDIT: Say you use 10 units of fuel at 1200rpm to make 30hp, but you use 4 units of fuel at 2400rpm to make 30hp... You can see that although, yes, you're spinning the engine twice as fast, you're using under half the amount of fuel...
Remember *power* is made of two components, RPMs and Torque - if that confuses you, then think about smashing a nail with a small hammer, lots of times a second, or twatting it with a massive sledgehammer once or twice - that's the difference between torque and RPM..
You use fuel to make torque, and technically injecting more frequently (i.e. more RPMs) will use less fuel than injecting lots, less frequently... These engines were designed to be at their most effective at using the least amount of fuel to generate the most power at around 2000rpm... Sitting at 1000rpm asking the engine to tug round the car isn't an efficient way of doing it.
From my experience, let the engine just spin slightly faster, don't press your foot any harder, if anything almost release your foot as revs increase... Don't let the engine "chug" at low RPMs, that's the ECU correcting thinking you're about to stall, uses loads of fuel...
EDIT: Say you use 10 units of fuel at 1200rpm to make 30hp, but you use 4 units of fuel at 2400rpm to make 30hp... You can see that although, yes, you're spinning the engine twice as fast, you're using under half the amount of fuel...
