Originally Posted by theSLEEPER (Post 15413)

Just wondering.

Without CP testing equiptment, how would you know when it was too much fuel? By ear. Seriously. The way the truck sounds and feels is a very good indication of what is going on. Is it perfect? Hardly. The problem with actual combustion pressure (CP) equipment is that it is a pain to install....especially on a 7.3L. Besides, without knowing what to look for (not to mention what else to hook up), most folks out there would have a worthless piece of expensive equipment sitting on the shelf. The amount of fuel isn't nearly as detrimental as WHEN the fuel gets there.

Let's say, Stg. 2's, with known good injectors and nozzles, and something like a 38R. It seems to me that "Stage 2" injectors are usually a recipe for broken engines. Why? My guess is that a lot of folks view them as glorified stockers when they are hardly that at all. "St. 2" injectors are capable of moving a lot of fuel due to the nozzle size but lack the injection volume (CC) to do much good for a long injection event. They empty quickly.

Wouldn't the sound be enough to tell you something is wrong? I know that I can hear the difference in SOI or "timing" when switching tunes. Sometimes. Without placing myself in a hairy situation, I have seen differences in various peoples' tuning. Is there a difference, you bet...and usually it's quite different between different tuners. Going by sound alone can be revealing.

Would severely advanced "timing" create a better running motor? Or would it just cause excessive heat? Believe it or not, diesels are similar to gassers in this respect. A lot of SOI advance is a good thing....to a point. Once the piston starts it's huge push before the crankshaft throw has passed TDC, it becomes bad. Same as a gasser. However, the hotter combustion temperatures aren't Mother Nature's best friend (according to the EPA nazi brigade).

What about excessive ICP along with excessive "timing"?

Does increased ICP create advanced timing? All else equal.I'll attempt these two at once. It gets hairy here since increased ICP DOES create a pseudo-advancing effect by injecting more fuel in a shorter amount of time. More fuel, shorter amount of time, and all occuring earlier in the pre-power stroke cycle.

What about IDM mods? Same thing...injector opens sooner by a few microseconds.

I'm sorry, the title may not be fitting for my questions, but I'm trying to gather all I can as soon as I can.

Could you create a more quiet and less smokey running motor by delaying SOI and calling for less fuel? Would that cause excessive lag?

I guess this is all more "theory" and not pertaining to Minotaur, so if it needs to be moved...

Thank ya'll in advance!!!
Jeret

Originally Posted by theSLEEPER (Post 15426)

Does Blowby do all of his own tuning?

Originally Posted by cleatus12r (Post 15441)

At some times I do as well. It stays pretty tame around here though with just a few folks....it's not always a giant argument (think PSN).

Originally Posted by theSLEEPER (Post 15502)

Does anyone know about what a stocker puts out in CC's per each shot at it's max?

What do ya'll feel like a good ICP max is at WOT on a stock injectored motor with stock oil? 2800-3000 PSI max.

I've put a 10K mod on top of my chip once before when I was running an extremely laggy BBW turbo, and it seemed to help the spooling a good bit. Yep. That's about normal. The higher injection pressure at low RPM will help spool the turbocharger by increasing EGT from a more complete burn.

Does anyone know how to wire up a potentiometer into the ICP and which one to use? I'd like to wire it with a switch so that I don't have to run it all of the time, but I feel like there's a little bit to be gained with a slightly increased ICP over what I have now... Yes. I will attach two pictures that I drew up for a guy over at the Nation who had some ICP Mod concerns.

A scanner will not read ICP correctly if I have a 10K in there. Correct? I'd have to check it with a mech. gauge right? The scanner WILL show the desired pressure (and what it thinks is correct), but it will actually be higher than what is shown on the scan tool. You will need a gauge to see what is actually happening. The only differences you'll notice on the scanner is the IPR duty cycle will be higher when the ICP Mod is active.

Originally Posted by theSLEEPER (Post 15530)

Sorry to be a pain. But which color is to the PCM? And just for my own mental library, what do the other two wires go to?

Originally Posted by cleatus12r (Post 15542)

Just for shiggles, there is another ICP Mod that uses a resistor in parallel with the ICP sensor that went between the blue wire and the gray wire. However, the LOWER the resistance in that setup, the HIGHER the ICP would actually be.