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Message: [QUOTE="Hotrodtractor, post: 1145460, member: 25"] I don't even know where to begin with this thread..... 1) The problem is not necessarily in the electronics, but it is a control problem none the less. 2) Just because someone advertises a 600cc or 750cc injector does not mean that all of that volume is being used. Sometimes it is the nature of how production things are modified into performance things that gives you certain values that you just have to roll with. 3) Injection ratio and moving mass amounts of fluid are all VERY critical to a HEUI setup. There are lots of scenarios to consider and lots of compromises to be made. A numerically lower injection ratio can actually deliver a higher injection pressure to a tip at HIGH demand - this is due to pressure loss of fluid through is travel to the intensifier piston. With a higher injection ratio the flow rate demand to keep up is so high that the amount of pressure that is lost is great enough that it is a detriment to injection pressure. A lower injection ratio means that at LOW demands you don't have as high of an injection pressure as you would with a higher injection ratio (all things being equal). 4) Others have tired lower ratio plungers and barrels - they didn't work due to machining tolerances - these things HAVE to be VERY tight. They also chose poorly on their injection ratio (I'll just say that is my opinion as I don't want to go down the path of how to choose an optimum ratio number based upon actual data points and extrapolating operating ranges for certain tasks). The plungers and barrels that I have were machined in a temperature controlled environment, then heat treated, then ground in a very tightly controlled temperature controlled environment, then shipped to Europe for a proprietary coating that you will find used on a good number of the aftermarket plungers and barrels being used for mechanical pumps, then they were all measured used custom made air gauges and hand fit and matched to provide the desired fit tolerance. If I take the plunger out of the barrel and hold it in my hand for a minute and try and reassemble it, it won't fit. There is a 50 millionths of an inch slip fit when all is said and done (that's 0.00005" and also very comparable to the high performance plungers and barrels found in the high end mechanical pumps). 5) I have designed and prototyped new solenoids - utilizing the same power requirements as the current solenoids I have quadrupled the strength at the same distance. Yay science! It remains to be seen if these cause other electrical interference issues in operation.... It takes over 100 components and nearly 30 hours to build one precisely by hand once the components themselves are manufactured from raw stock. 6) Refilling the injector is not a concern for me. I have yet to see any issues using standard fuel pressure setups. On my pulling truck I tested up to 300psi using a mechanical lift pump.... so options are already out there if it does become an issue. (DON'T go out and put 300psi to your injectors.... you won't like it!!) 7) I laugh at the old 4kpsi "extreme ICP" - that is far from extreme. 8) Most people base the capabilities of the 7.3 bottom end on how it has handled an injection system that is slow and requires LONG PW events to inject a volume of fuel worthy of power. That LONG PW directly translates into low RPM. Low RPM, "high" power means high torque. Torque makes **** go boom. 9) This stuff is expensive and time consuming. I'm doing it on my own dime and it will be ready when its ready and I have no expectations of ever getting close to breaking even - no one can afford to buy parts for what they actually cost to make in such small quantities. [/QUOTE]