What are the steps needed to go from my current 2 bar to a 3 bar setup? Obviously buying a new 3 bar sensor and retuning, but what are the steps for the changing the tune from a 2 bar to a 3 bar?

Thanks

 

That depends on what tuning software and operating system you are using.

 

411 and HP tuners

 

I hope you still have your stock file, because any HPT COS requires applying the OS to a file that does not yet have another COS applied to it. After modifying a stock OS to the 3bar HPT OS, just do a compare and take all your current relevant info into the new file. Change your MAP sensor linear and offset, and repopulate your new VE table just like when you first changed to a 2bar COS. Be aware that if you are logging a wideband through the EGR input, some of the HPT 3bar systems break that functionality.