I'm about half-way through the process of rebuilding an 05 Cummins 5.9L HO engine capable of producing approx. 600HP. My question is this:
Cummins states that their stock CP3 will be more than capable of handling 600HP, and they are NOT recommending a CP3 modification/upgrade; however, I have read on this blog and other diesel blogs that the CP3 needs to be modified anywhere from 17% to 85%, increasing the fueling capabilities. So which one is it? Stock? 17% increase? 85% increase? Those are huge disparities! Opinions are nice and certainly welcome, but I'd like to hear from the guys running at or near 600HP. Please and thank you.

 

YES! Marginal fix bag of parts. Real fix call Todd at T&C Diesel! Tell him what you need he won't over sell you! Great customer service and has the RIGHT answers! Tell him Andy CA said hey!

 

I appreciate you chiming in, since you obviously lay down the "ponies", and I'll call Todd @ T&C tomorrow and let him know you sent me his way. When you say marginal, would that be 17% or 33% or 45%? I'm thinking 85% is overkill. I've found "bag o' parts" that are 17% and 33%.

 

Todd will point you in the right direction! I was thinking 17%

 

Thank you again. I spoke with Todd, and he told me 17% would be all I needed for what I am wanting to do. He also told me to tell you thanks for sending me his way. Great guy--very knowledgable. I appreciate your help. I hope to return the favor sometime.