#Yamaha sho ecu flash series

#Yamaha sho ecu flash series

Back to the point, my props are salt water series II 16.25 x 17. Lucky me, got to purchase a new LH lower unit during covid. I cannot explain the degradation as hull is clean, engines sound/check good and only 500hrs on powerhead. I too only got 5400 rpm at survey, and now 5200. Gives the owners a 50/75/100 hp dial on the dash board. Additionally, I have a good friend that runs V10 Mercs on his Yellowfin, but for many years he as done this on Duramax diesels. I have raised the question do they consider local operating conditions and regionally they have different maps? S.Fl is completely different than Boston. Like others have stated simple fuel/air modification. The download can be done DIY, I think but don't trust me. My neighbor turned me onto Nixpro as his friends did the flash on their 300s (engine details I do not know) they were happy. Don't forget the tune will require higher octane over 87.Ĭhrisk, I am new to the forum and investigating Nizpro. A tuner can play with those maps to get more power at the expense of what typically is more NOx emissions, especially if you are tuning a 4.2 to out muscle an f300. Keep in mind the factory ECU mapping is engineered for performance, but also emissions.

Just because the rev limit is raised doesn't mean you need to run your engine that high. Will it hurt the engine if you did? Probably not if the engine is well maintained. The f300 will gain some power in the midrange, but the peak numbers are only achieved near the higher rev limiter.Īs for the risk, I wouldn't want to run any large outboard for long periods of time at WOT, let alone at a higher rev limit than what the factory did. As stated by another member, the 4.2 225 and 250 will benefit the most. With Nizpro they raise the rev limiter several hundred rpm's while also tuning for more power across the entire rev range. ECU fuel and ignition mapping are the only differences.

The 4.2 f250 is the same engine as the f300.