Anybody have any inside knowledge how the pro engine builders are doing it? I can't imagine they are replacing O2 sensors on a regular basis?

What is Mercury racing doing?

What about Teague or Eddie from young performance?


I am thinking seriously about converting my NA 502's to the Holley system this winter but don't like all this trouble with O2 sensors. As much as carb tuning is a PITA and not my strong suit it might be better than dealing with stuff like this!

There has got to be a fix for this!

I was wondering the same thing...I'm thinking they may dyno a engine, get it dialed in, then just burn the program for that run of engines...and not use the 02 on the engines when in use, but love to know for sure...

X100 guys

who ???

I thought that too but that seems a bit short sighted. Atmospheric conditions are always changing so if you have a system that is constantly learning then this is a must. I am pretty sure the auto manufacturers don't run O2 sensors all the time just for emissions but instead to fine tune engine configuration on the fly?

Seems like we would want to do the same in our boats?

Maybe one of those guys will stumble upon this thread?

Thats one reason the merc EFI is always rich...just making them safe as they can for somebody that would run WOT for 30 mins...

wonder if they do one for use with headers and a std 02 bung ?

Not sure could call them

I think this may be the ticket for us using these headers.

Im thinking about taking that anti fouler and JB welding for steel wool inside (so it wont get blown/sucked out) and then putting the O2 on top of that. That way the water should not be able to wash back up and through the steel wool.

Thoughts/suggestions/criticism is welcome