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4k springs. I understand that the pump on our trucks does not respond exactly like the pump on the 5.9 for which these spring kits were designed. Our pumps getting less rpm than advertised on the kit.
If I understand it correctly, we have limited options on how high the engines will rev. Governor springs and valve spring float. So yes we all have Defueling, that is what the governor springs do. Without defueling (properly working Governor springs) the engines would rev until something broke, the fuel pump could not keep up with fuel supply, or the max amount of air is pulled through the turbo. All would be a bad thing.
Awesome
The RV guys show that a less restrictive muffler helps greatly in lowering EGT's. They seem to be the largest group of personally owned 8.3 engines, and they are always seeking more hp and mpg, so I study there. A lot of them use the Aeroturbine 4040XL muffler. Advancing injection timing is also supposed to lower EGT's, but I have yet to do that, since it is 11F outside right now. Your thermocouple or gauge may not be accurate (possibility). 1200F seems high for an otherwise stock engine. Increasing the low fuel rate should not play much part in 60mph fueling. Most guys can't get their EGT past 900F on a stock engine from what I am seeing. You do seem to have a knarly box on the back, but I doubt it adds that much loading. If changing turbos increased EGT, the one you installed likely has more backpressure on the turbine (exhaust) side. Our engines come with a Holset HX40/H1E. Next sizes up are HX50 and then HX55 if staying with Holset. Do you know the model of the turbo you installed? You would have to compare compressor maps if it is not a Holset to know which way you went.
Actually, you do. You have "de-fueling" every time you take off from a light. The governor controls the engine speed. The throttle is nothing more than simply a request signal for desired engine speed/power. There is a spring loaded air pressure diaphragm on the back of the injection pump that has an air line going to it, which limits fuel rack travel on take off until turbo pressure is up, this limits excessive exhaust smoke. This mechanism is called "AFC", or air-fuel control.Not that anybody is wrong, but I would call de-fueling as any action of (user) unintended fuel rack reduction. The 3 things that can reduce the fuel flow to the engine beyond what the accelerator pedal is asking for would be:1. Engine RPM (governor spring)2. Boost controlled fuel addition (take off), aka AFC. 3. Running out of fuel (ummm, I have done this more than I care to mention). Note: SS site not allowing paragraph spacing right now.
Look forward to hearing what you think of that turbo. Where did you get it from? Just ordered the GSK, and a 5'' donaldson silent partner muffler so I'm thinking of the next few logical steps.
Mine idles lower than 400F and I've adjusted mine some
