To get 800RWHP out of a Cummins takes a little more than that. You said "ecu" so you're talking about a 24V or common rail, since a 12V doesn't have an ECU. But it's not common to swap valve springs on a 24V. Actually, there really aren't many 24V's out there making much more than 600RWHP. They exist, it just isn't as common as seeing a 12V do it. A 12V typically takes a large set of twins, O-ringed head/block, valve springs, big injectors, reworked P7100 including lazer cut delivery valves and some sort of drug. I have a buddy with a 900RWHP twinned Cummins that runs mid 10's @ over 130mph drug free. He recently went back to a large single and multiple stages of nitrous. He's still trying to get it dialed in. Last weekend he was third in qualifying with a 10.67 @ 126mph taking it easy and not using all the nitrous systems. It's a blast cruising that truck around Houston.
Here's a pic of it.
http://www.krylonracing.com/dhra/DSCN0761.JPG
This is Maddog's truck.
http://www.krylonracing.com/dhra/DSCN0749.JPG
You've probably seen a video of a Ford with a Cummins that runs mid 10's. Well that's it with me and a few friends standing around it. That truck drives like stock and makes over 1,000RWHP. Richard is also the guy operating the dyno while I make a pull in the video below. He's a super nice guy.
Well, here's the link to the second pass I made. I left the line with a few pounds of boost and still pulled a 1.87 60'. I haven't seen the video yet, so tell me what you think. Dialup owns me!
http://www.krylonracing.com/dhra/DSCN0746.MOV
Here's a video of third dyno pull. 440RWHP @ ~3,000RPMS. Can you say Torque?
http://www.krylonracing.com/dhra/DSCN0759.MOV
I bet a couple of 150 shots of nitrous will clear up that smoke nicely.
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