The C15 is a Electronic controlled motor. The programing in the ECU (engine control unit) monitors multiple engine sensors including air temp and fuel temp. Unlike earlier 3406 engines with a mechanical injection pump the C-15 uses an EPU (electronic pump unit) which is an injector with an electrical seleniod which controls the duration of fuel delivery to the injector.
To be able to increase the horse power of the engine, depending on what level it started it life it can simply be reprogramed at a deal. if it started at the low end of the horse power range you might have to change the injectors and turbo to get it to the HP range that you want.
there are multiple variations of the motor ranging from 435 to 600 HP. What type of truck is it in? whats the purpose of the truck? what is the desired mpg?
here is a link from CAT giving a brief over view of the C-15 family.
http://ohe.cat.com/cda/files/448363/7/LE鈥?/a>
i hope this helps
Chris|||did you try looking into industrial injectors or bigger injectors period. remember though you need to increase air flow when increasing fuel pressure. i haven't worked on any newer trucks yet but with the older ones with mechanical pumps you can take it apart and the main fuel port can be sized up to increase fuel flow and the older cats 425, also give the small shaft 1/4 turn for a pressure increase. Other than that i would try to find an old school cat mechanic my friend who is currently in iraq right now had a 99 kw with 3.5 million miles his 550 was pushing 780 hp to the rear wheels and getting 6.6 mpg with 90,000+. I wish i could get ahold of the guy who built his motor like that but i dunno where he is at any more so there is alot you can do even with the computered trucks you just gotta find the right person. Good luck and thanks for ridin the right kind!!!!!
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