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Message: [QUOTE="V-Ref, post: 982418, member: 660"] Billy I respect the opinions of folks like Gearhead, Nate, Golfer, Blowby, 907Dave, Charles, there's this guy that builds Hot Rod Lawn Tractors and such... and other 50 lb brain types....and I hope they post up answers that are better then my .5 lb brain ones... But....here's a go at it... The mechanical injection window from Start of Injection (SOI), to the end of the injection event in terms of mechanical crank angle in relation to TDC is a static "mechanical" window. As RPM increases, so does piston speed. The mechanical window stays the same, however the "time" associated for the injection event decreases with engine rpm. The hydraulic limitations of the HPO side of the injector to recover between injection events for an individual injector, as well as the IDM/solenoid side of the injector sytem start to create some fuel delivery limitations at higher rpm. If you increase "timing" or when the SOI starts too far, in order to create more "time" for the injection event, you increase cylinder pressure, and therefore torque....to the point of internal engine component failure. Modifications to increase the "speed" and "quality" of the injection event, and decrease the time necessary for the injector to "recover" between those events, are what injector builders have worked very hard at developing, and are very close hold about. I believe Unlimited Diesel injectors have actual alien technology they are so fast, and Gearhead tuning has used this in his ability to put a customers cell phone up to the PCM on a 7.3 and decide what tuning (if any) changes need to be made. Here's some video of Matt wrecking cars using an Alien Tractor Beam system disguised as crash barrier testing. [url]http://powerstrokearmy.com/forums/showthread.php?t=46311[/url] [/QUOTE]