O2 sensor in my CMIs
 

Im looking to get an O2 sensor bung installed in my CMI headers on my 525sc. Does anyone know of someone reputable in Socal that can do this for me? And fairly quickly as well?

Go to any muffler shop, they can pop em in. Just wondering your motor is the SCI version not the SC correct? Otherwise, why are you needing the 02 Sensors.

I have a custom 540 Fuel Injected ASM kit with a FAST ECU and the initial programming is all ready built in for the 02 correction due to the wet exhaust.

I have the bung in my riser but we only use it temporarily to get the readings and final tune the boat on the water after the initial dyno programming.

If you were to run the O2 sensor full time it would hammer the sensor and it would not last. Which, is why the correction is built into the initial ECU.

At least that is what i was told from Westec Performance in Ontario CA, who dynoed the motor.

Just a thought.

I don't know about a muffler shop worrking on my expensive cmi's. You might check with Teague custom marine, GT marine, or Pfaff in socal. Where do you live? It's important to get the water jacket sealed and keep the stainless polished.. Mine was removed to do the welding and then reinstalled. I totally agree that trying to run them full time will be a problem. I only use it for ecu programing. Even then we have had issues with water damaging the sensor.

no this is a carbed 525sc motor. I would be doing this for tuning purposes only and they would be pulled after i get the motor where i want it to be.

I just dont trust any of the muffler shops ive used around me to do a clean enough job to do work on these expensive headers, and i want someone that understands that there is water in there as well and that they have to seal it up.

I am correct on this right? There is water running all around the riser correct? there isnt a spot where this could be done without worrying about water right?

The boat is at the chino airport and I am in orange county. So someone that is near either one of those areas would be great. I am actually going to Teague tomorrow but I wont have my headers with me as I am coming from SLO and stopping by on my way down to OC.

Thats what i thought you were doing, just wanted to make sure you knew. They are water jacketed pipes so you have to worry about water.

Can you UPS a tailpipe to CMI?

I sent mine to CMI. They got them back to me quickly. I wouldnt trust anyone else with them.

I could send a tailpipe in to them maybe. Anyone done this? I know reversion is a problem for nearly everyone so I wonder how bad it would be for my setup by putting the sensor out in the tailpipe. The farther out the worse it will be . . .

checkmate454mag, what did they charge you to do this? and did you do it on the riser or the tailpipe?

I run full dry tails, so reversion is not an issue for me. The O2 sensor bung is welded in the tail pipe, maybe 1" or so in from the header. I think they charged me $125 or so. I remember, it wasnt much.

1 engine. Kind of steep...:eek: :(

I must be lucky. I have now run my o2 in my cmi for the last 3 years. I do check & make sure the O2 passes the fast test from time to time.
I had a local guy do mine who welds on custom motorcycles. He did a good job. If you have time I would send back to CMI. That way you will know for sure it was done correctly.

pics of mine, pipes are dry

I'll bring this thread back up because I just had a stainless bung welded into my imco risers for the 21SB. Only costs $32- thanks IMCO!:kiss:

I searched around for others that have had it done to wet exhaust... I have some very minor reversion at idle it appears. I ran it on the hose and got a tiny drip out of the bung after idling a long time (it was finger tight) I pulled it out and sure enough tiny bit of water at idle is getting back to it. I pulled everything back apart and double checked... looks good/no leaks. I'm sure its due to the cam and feel more confident about it now after reading this. I have some slip in mufflers that might help get the velocity up at idle and external flaps I can install, maybe all that will help some to keep water flowing to the rear? Either way, I was suprised to have the minor amount of reversion- I've never messed around with o2 sensors in marine applications till now (I was an outboard guy)

Oh yea, I'm just running the o2 to get fuel mapping checked out, not perm.

Just spoke to IMCO... they quoted $132 per tailpipe plus shipping... not $32...special discount?

I don't remenber for sure, but I might have run it thru one of the guys I buy parts from out west....he is right down the street from imco... I don't have the reciept, but I do have a charge on my credit card where I bought parts at that same time from him and the times all match up for when I got the bung welded in.