O2 sensors and salt air is definitely a concern. If your tail pipes are going out the transom, and your boating in salt water, your o2 sensors will not last forever and it will end your day if they go bad. That salt air and moisture will work it's way back through the dry portion of your exhaust. Boating in fresh water much less of a concern, but I personally think moisture does work it's way back into the dry portion of the exhaust, and after time, will kill an o2, and potentially your motor. I would tune it on the safe side, and then pull those o2 sensors out and plug the holes. If some day your feeling like some more power, plug them back in and start playing with it.

Ryan,

This is exactly where we are. Tune is conservative and safe. WBO2 is out, the ports plugged and the cable coiled and buttoned up. I have the sensor, sensor socket and 3/8 breaker bar, and an old 10mm Allen wrench for the O2 port plugs in a ziplock on the boat. I’ll have the laptop charged and with me for the first several trips, and the tuner on speed dial.

This boat will never see salt water as long as we own it. Just…. No. But I hear ya loud and clear on the water/WBO2 thing.

Thanks. Brad.

The Eddie marine engines I`m getting are open loop.

So your saying closed loop is the best and everyone should be running it, but your engines run open loop?

*you`re

I guess I wasn't fully awake yet

02 is not the most accurate way. It is super easy, yes. Must accurate way is the read the plugs, more work by far.

100% incorrect. EFI will make fueling adjustments by using the sensors and what is programmed in the ecu/tune. Not even close to a carburetor. It won't make addition adjustments on top of the sensors if the 02's are turned off. I personally limit my 02 correction to 4% for idle / p/t and have 02 correction turned off at higher loads. If you 02's are correcting 10% or more, your tune is way off IMO.

UnderPSI,

Plus, as I’m told, the HP has a barometer, so it will, in fact, compensate for changes in weather and elevation.

Thanks. Brad.

You were told wrong.
You're MAP and closed loop compensation accounts for that.

Rookie,

https://cimg6.ibsrv.net/gimg/www.off...78b31cced3.png

It might be a matter of semantics, but, it does, in fact, account for air density changes, like a barometer.

Thanks. Brad.