I have a question for those experienced with SD tuning. If you don't change the intake/throttle body, do you tune need to tune in the cells with vacuum (MAP <100)?

I'm thinking that only when vacuum is zero would actual airflow be different when engine breathing has been improved due to mods. When you're in vacuum, I'm thinking that the mods that improve airflow would just put you in another cell (more airflow against the same throttle/angle equals more vacuum).

I'm doing heads (vortec), converting to a mild roller cam (ram jet cam), and intake on a TBI boat and will be getting into the joys of tuning without an O2 sensor, but that will be for a different post...

 

Is the ECU .bin factory tuned for automobile? If so the tune may be way off. I would think a linear load or water resistence would be easier to tune. I have an efi boat. Not sure if it has a NB02.

 

No, I'll be starting with the factory tune for the boat. The thing I've heard about tuning boats is that you have to be real careful not to be lean. The boat's under high load all the time, while in a car, you accelerate and then cruise under low load. Lean under high load for a long period of time can equal detonation and/or burned valves.

 

Here is what I would worry about.

 

Ouch - what was the cause of that? Looks like a melted hyper piston.

 

Ouch indeed. That looks a bit more like a detenation problem.

 

A little JB Weld will fix that right up!