Thank you for the additional info. I do agree with the fact that a higher horsepower idi does change what it is meant for. I guess I should have clarified when I said that. Even in newer rigs, I don't think its smart to go much past a tow tune. It just depends what you use the vehicle for. A regular DD and weekend warrior would be feasible though.
I discussed this quite a bit with Justin before ordering my pump. I told him I wanted a DB4 and he asked me 150cc or 180cc? I told him I wanted the all-out 180cc because my long block will be capable of supporting it so why not? Right? Well, a couple sacrifices had to be made to get that much out of the pump. One is locked out timing and cold advance mechanism delete. I already have concerns about cold starts with lowered compression. I don't need HPCA delete making this worse. His website also says "due to the nature of the governor resolution, this pump is not recommended for daily drivers". I asked him how much of a problem this is, and he said the 180cc for the guy who wants to just run it and does not care how it acts. Like I said, the 180cc is on the fringe edge of what is possible with a rotary pump. If I were building a truck for sled pulls or dirt drags, then I'd want the 180cc. Since I still want to be able to back my travel trailer into a camp spot and gently maneuver 4x4 roads I went with the 150cc. That's why he offers it. It's the "street" DB4, it says it right in his website. Before somebody calls me on it... I know. It's a limitation of the DB pump, not the horsepower level per se. But we are talking about IDI builds and that's where we are at when it comes to bolt on fuel.