Quote:
Originally Posted by cleanspeed1
Got to get the engine to run hotter. Evans Coolant ( biodegradeable, 375 F boiling point ) and raising the operating temp will help you gain mpg. Turn the engine fuel delivery down with smaller injectors ( I saw the hitch in the back, do you tow with it? ).
Heat the fuel up so that it reacts better inside the engine ( diesel needs all the help it can get to go from ambient to auto ignition point ), add propane or cng assist as a range extender. If you are feeling real frisky, get a cam ground or find a factory camshaft that brings the torque peak in at 1600 or lower rpm, and modify the fuel delivery so that the powercurve peaks quickly and falls off ( like a semi truck engine, car diesels keep the powerband flat and long so that it accelerates well ); see if your engine is used in commercial apps that require that type of powercurve and use it.
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Fuel is heated to coolant temp before injecting into motor, filter is in same housing as thermostat is, so when cylinder head warms, also fuel warms, it is great in our winters, where temperature can drom to -40C.
To heat air, that is easy as it requires only limiting air flow to intercooler, however it is very easy to to loose power and get excessive diesel consumption with that.
I don't tow too much, once in two years, but most of time I have 200-300kg of load in trunk, so I'm pretty much always driving near gross weight limit, this means that climbing those long hills means lot of load to engine and this means again lot of heat. Current grille block is about maximum I can have and still be able to climb hills without crawling, but when coasting temps tennd to get bit lower, that engine is producing quite a bit of heat for a diesel, also headgasket is common failing point so I'm bit afraid to get too much of heat there.
There was one valve for turbo cars, which lets pressure to wastegate actuator only after set pressure is reached, this causes turbo to spool up earlier as wastegate is not open at all until pressure is reached and such would bring more torque to lower rpm if I'm not horrible mistaken.
I'm running at 1850rpm @50mph which is what I can drive with that car, maximum torque comes at 2250rpm from my memory, however at least before mods putting bigger tires under the car caused rpm to be too low for car to run well, diesel consumption did increase dramatically, even with hypermiling I had hard time to meet rated consumption levels, surely car did have power in reserve, but I had to push pedal down more so that turbo came into play, but if turbo would come in with less throttle, then I think that I could save a bit with bigger tyres.