Just a quick question, I did some searching but couldn't find an answer. I will be running MSnS with my new turbo setup, and I already have a 02 bung for the stock sensor in my DP but I dont really want to get another one welded in as its difficult to find a place around here that can weld stainless-steel. So I was thinking, the stock ECU isnt controlling the fuel anymore, so can I remove the stock sensor entirely and just use the one already in for my wideband? Just curious as to how other MS users do this. TIA

95 GS-turbo: SOLD
92 Laser AWD- has a lot done, needs a lot more...
88 Suzuki Samurai- Daily beater/mudder

since ur not using the stock ecu . i dont see a reason ehy u would need the stock 02 sensor

LED tails : Done for now!
99 eclipse rst
cobalt blue met. paint,star stage 2 upgraded t3/t460trim turbo ceramic coated , polished compressor housing, ,optima yellow top, chrome i/c piping ,front mount ntercooler ,apexi turbo timer . zeitronix wb02 ,faze oil ,boost gauge,egt ,bosch 4x plugs,kyb agx struts, pro kit springs.17''adr venomous rims,Falken azenis ,brembo dilled/slotted rotors ,turbo xs bov ,oil catch can,manual shiftknob,autometer pyrometer egt , vortech sfmu,b&m fuel pressure gauge ,accel 310cc injectors ,gasketmatched and polished intake manifold ,58mm throttle body ,no egr,polished turbonetics wastegate,fuel pump rewire,homade fcd and a lot more .LED reverse lights ,sidemarkers and tails .atx to mtx swap . South bend tz clutch . Tons more
http://imageshack.us>


http://www.2gnt.com/index.php?d=boosted60trimrst
My contribution to the wiki
http://www.2gnt.com/index.php?d=crank%20arm%20spindle%20mod%20to%20fit%20power%20panels

If you install the megasquirt while leaving the stock ECU in to control idle, I don't think it will be a problem. As far as I can recall the ECU only needs a couple temperatures to determine idle, so it shouldn't be a problem.

But it sounds like you are running your wideband in the rear O2 sensor spot? You should have it as close to your turbine discharge as you can, heats up quicker and maintains that heat better to ensure you are getting an accurate reading from it.

1995 Eagle Talon ESi

No, running the wideband from the front 02 sensor is what I want to do. Thus removing the front one entirely.

This is what I'm planning on doing when I actually get around to completing both installs...

I think I asked Terry about this once, he said to have another bung welded in for my wideband I think. I'm gonna be at this decision this week sometime most likely, so I would love to see if this is possible. I'm gonna check my pm's now to clarify.

-Xavier-
95 Eclipse RS-T...lost in the frozen tundra

I recommend adding a bung. Any shop with a mig welder can weld stainless steel. If they have steel wire in the Mig, you will need to coat the weld with high temp paint so it wont rust.


Terry

I've got a second bung too... it's worth it unless you are going to be removing the stock ECU entirely, one less CEL.

2016 WRX STi Limited (current)
2001 A4 1.8tqms (donated)
1991 GVR4 #1933 (sold)
old.dsmregistry.com/detail.php?carid=218 (dismantled)

Does your wideband have a output for a narrowband o2 sensor? I used that and removed the stock o2. So my wadeband sent a signal to the msns and to the stock ecu. Make sense?

The narrowband output is still useless for preventing the CEL because the heater circuit will not be hooked up, and the stock ECU will pick right up on it.

Unfortunately, you cannot just put a certian resistor across the heater circuit, the resistance of the heater on a heated oxygen sensor changes depending on the tempature of the sensor - high tempature, high resistance, pulls less current, less heating. Low tempature, low resistance, pulls more current, more heating.

2016 WRX STi Limited (current)
2001 A4 1.8tqms (donated)
1991 GVR4 #1933 (sold)
old.dsmregistry.com/detail.php?carid=218 (dismantled)

With MS though, you already have a CEL, so its not like adding one more would make that much of a difference. Couldn't you just do Corbins vfaq writeup to the front O2 and just ignore the heating element all together? Sure you would get another CEL code, but the stock ECU would still be reading stoich. right? I know I can just get another bung welded and it wouldn't be that big of a deal, but I was just curious.

95 GS-turbo: SOLD
92 Laser AWD- has a lot done, needs a lot more...
88 Suzuki Samurai- Daily beater/mudder