Had my builder weld in a nub so I could insatll his oxi sensor in the headers. Quite a difference from a dyno with dyno headers to the boat ! In this pic he is holding the AF ratio meter. We took the boat out for a couple of good runs and made some final adjustments. I'm sure its running stronger. The water conditions kept my from getting a top speed.
Manowar and CJ, do you just drill a whole and weld the 02 bung on there?
And maybe this is a dumb question but isn't it double walled to seperate the water where you put the bung? So do you have to also weld between the walls where you drilled the hole to seal the hole to keep water from entering the system too soon? Or is it welded on both the oustide and inside? Does that make sense? :confused1
My engine guy did mine, so I can't say for sure. But I asked him the same question. He told me the oxi unit has to go into the header before water is introduced. So it requires it at the double wall section. He welded both inside and out for mine.
It feels like it would be quicker to tell you what I haven't done.
We are in process of putting a f.a.s.t system on so we can program right here and not send away for any re-programming. I'm also putting a bung in for a wide ban O2 sensor and just did a motor refresh. New fuel pump and larger injectors. It's going to the dyno end of the week so it can be tunned and then double checked in the boat next week. It all has been a huge learning experience. :banghead:
I don't know about the piggy backing, but I am using the stock Merc computer. Things got real difficult when we changed to aluminum heads. I had to buy a computer system from MEFI.com so we could axcess the computer and adjust it ourselfs. Took 88 uploads with engine on the dyno to get her right. Then another 10 or so in the boat ! I didn't think it was that difficult. But I understand why now.
My engine guy didn't likt the F.A.S.T. system, not really sure why.
But you have a different computer than I so maybe the F.A.S.T. system will be good for you.