New owner of KW T660 ISX15 CM2250

[Rawze]

(09-12-2017 )Squish099 Wrote:  Trust me, I'm paranoid about it.. It's getting rebuilt @ bearing roll time.. Also, I don't believe that the 2250 is capable of the fuel economy that the 871 is.

Comparing them against each other after proper de-mandates and good custom tuning - I have seen some CM2250's get really close to the same fuel mileage as the CM871 but not really beat it. The 2350 can be programmed to get really close to the CM871 in efficiency as well,.. but it becomes risky to do. When you get it there,... You are getting outside of its safe operating zones of that HCCI injection process. Not worth the risk to the engine/head gasket at higher power levels. Better to program it conservatively and more on the "protection" side of things on that one for sure.