E36 M3 lambda sensors needed?

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  1. E36 M3 lambda sensors needed? 
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    Fitting an M3 into my Compact this week As it is a competition car I'm considering:

    a. Using no cats
    b. Using a single sport cat (instead of twin cat OE system)

    Which of the above would you recommend? Or do I need to stick to original? If I can do above, what do I do with lambda sensors in each case? Thanks.
     
     

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    Excellent to hear of the conversion. I hope there will be lot's of before and after photo's

    Can the ECU be mapped to compensate for not using the lambda sensors? If so then I would go to an exhaust supplier and purchase the threaded metal bungs that they use to protect the inners of the cats whilst in storage or just have the holes welded up
     
     

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    No idea about remapping the ECU - can someone advise?
     
     

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    It will need the pre cat lambda sensor without a doubt, that's the one that tells the DME how the engine is burning and the DME adjusts suit, if you were trying to rid completely then it would get technical and I would say don't know

    The car can be made to run without the o2 sensors but it's not something I'd know how to do, after all at WOT(Wide Open Throttle) the lambda sensors aren't used
     
     

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    Thanks - as standard does each Cat have 2 lambda sensors then? I think the engine kit I've got only has two How do I know which I've got? Can anyone else add any more?
     
     

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    What year m3 engine? 3.0l or 3.2l?
     
     

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    Good point - 3.0l 1995
     
     

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    You should only have 2 pre cat sensors then IIRC
     
     

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    Can I stick them both in the same pipe before the cat as intending to use a single pipe system?
     
     

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    Quote Originally Posted by Notax View Post
    Can I stick them both in the same pipe before the cat as intending to use a single pipe system?

    Ronnie is right.............u only have 2 pre cat sensors.

    we would personally use 2 different pipes from the manifold (one pipe from each Bank) so the o2 sensors pick-up and adjust fuleing according to each bank- u could then join the pipes after the O2 sensors into one.

    And as for the car running without O2 sensors.............we would personally not do it----------the O2 sensors adjust and help with the fueling while the car is on idle and on part throttle i.e around town but soon as you hit full throttle, the sensors are over-ridden and the Map in the ECU takes care of the fueling and timing.

    I've seen track cars that have come in 2 us over the years where the customers wanted them road legal aswell- but have cars running with no O2 sensors and nothing to compensate for them while the cars are on part throttle- as a result the cars would idle a bit rich and obviously woud not pass emisions.

    We run our VW and Porsche conversions with the O2 sensors which keep the fueling and emisions in check at idle and around town but ECU and/or custom map would take care of the fueling and timing when the car would be at full load.

    Also mate, the O2 sensors are a great tune up tool with the right software and hardware- will give u a clear indiaction whether your car would be running dangerously lean or overfueling at any rev range and load
     
     

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    Notax (16-12-2008)

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