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Ai 300-400 question


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11 hours ago, Mackpro said:

All AI engines internals are the same except the for turbo and injectors and download that determine horsepower ratings.  I will have to find my AI horsepower charts to see the difference between 300 and 400 , sometimes the turbo has to be changed along with the injectiors  . 

And Some times the cam key

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For CCRS and ASET style engines the fuel pressure regulator starts opening at 59 psi. Early ETECH engines had an 59 psi and later a 100 psi valve . The 100 psi valve caused some fuel in the oil issues on some trucks . If the valve sticks it causes low power and in most cases hard starting as the fuel in the injection galley flows bank to the tank 

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