This would make sense on a gasoline engine, but there is no throttle in a Diesel engine. There are no pumping losses.
Diesel engines do still have throttles. How else would you control speed and engine rpm? It is true that diesel engines don't have throttle bodies, but ANY engine of any kind has to have some kind of throttle/control device to keep it from destroying itself and to make it useful.
This is why my truck with the 5.9L Diesel gets 17 MPG while the same Dodge 2500 with a 5.9L Gasoline engine will get significantly less...
Diesel fuel has a higher energy content per gallon than gasoline does, and the fact that diesels are compression ignition motors means that the reaction is going create a greater amount of energy. The reason diesel engines generally have higher fuel efficiency than a gasoline engine is because diesel engines themselves are far more thermally efficient than a gas engine of any kind.
However, if I have a stock truck and I add the injectors ONLY. I haven't really removed any restrictions... Same HY35 turbo. Same air horn. Same intercooler and charge pipes. Same air box...
The ONLY thing I've added is more fuel.
Now this makes sense... Bigger injectors = shorter duration for the same volume of fuel.
correct. An injector would be considered a restriction in a stock truck, especially a diesel, as the throttling on these trucks is done through the fuel system.
Now, how does this affect other things like towing? When I got my Smarty tuner, it has a setting that allows for higher fuel economy, but warns not to tow with it because timing is far advanced.
From my understanding, advancing the timing allows the motor to run a little hotter, increasing the efficiency of the combustion. If you place the extra strain of towing at increased rpm on top of the advanced timing, that may put too much strain on the stock head gaskets and/or stock head bolts and be likely to cause a blown gasket or damage internal components. I'm sure someone with more experience with programmers will chime in sooner or later, that's just a guess based on what I've read and my own experience.
Also, RV275, I assume are 275 HP injectors out of an RV engine?
That'd make them 50 HP injectors over the stock 235?
Am I right?
40hp over stock.
I've got to say I do enjoy discussions like this. Right or wrong, I always come away having learned something new.