Engine Drivetrain 1st Gen Cooper S ECU adaptations?

Discussion in 'Tuning and Performance' started by jiminni, Aug 18, 2010.

  1. jiminni

    jiminni Well-Known Member

    May 7, 2009
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    Just wondering if my ECU could be adapting to my SES codes? I get the PO420 code quite often as my cat is going out. I reset with my mounted SCll, so it's just a nuisance, but am wondering if the ECU could be seeing this and adapting? BTW I have a Mynes tune.
     
  2. Dr Obnxs

    Dr Obnxs New Member

    Jun 11, 2009
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    Nope...

    the adaptation values are the long and short fuel trim. If you have bad 02 sensors, then the car will start to loose gas mileage and a bunch of other stuff under closed loop operation.

    Matt
     
  3. btwdriver

    btwdriver New Member

    May 4, 2009
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    My understanding is that the ECU only uses the first O2 sensor to determine fuel mixtures in closed loop mode. I thought the second O2 sensor, the one that trips the P0420 code, is only used for emissions purposes.
     
  4. Thumper460

    Thumper460 Active Member

    May 26, 2009
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    My 02 is a dead puppy.. fuel mileage sux and the tail pipes are black... codes are P0130 / P0030 . and the P0420. I clear the codes and the same come back.. this is cool, I still run 135 mph, spank Mustangs and a lot of Rice. The light is on... however all I need to do is fix the O2. SOOoooo... soon , I will.

    Seems IF you know the issue ( bad Cat) then fix it... no more lites.. yes??

    Just me..................................

    Thumper
     
  5. btwdriver

    btwdriver New Member

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    With those codes it is your first O2 sensor that is bad correct? Could you not just swap the O2 sensors, that would at least allow your car to run in closed loop mode at low RPM's.
     
  6. Thumper460

    Thumper460 Active Member

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    Good thought! I'll just change out the bad one ( front) when the money comes in... Like I said it isnt running correct... but it still is a fun ride. Thanks.

    Just me.............................

    Thumper

    PS: the occasional Nitrous Hits keeps the chambers and plugs clean..lol
     
  7. jiminni

    jiminni Well-Known Member

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    Ok, so in reading the posts following my original post, it looks like with my code, P0420, it is the post cat sensor and should not effect the ECU or performance, as it does not. I am sure my cat is failing, it moves in the can. BTW, it is an aftermarket header.
     
  8. Dr Obnxs

    Dr Obnxs New Member

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    Our cars...

    cook the crap out of cats. If you're gonna go aftermarket, get a good one. I cooked a cheapie in less than a month of driving. I just put the one from the stock header back in....

    Matt
     
  9. CarlB

    CarlB Active Member

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    Who makes a good aftermarket Cat?
     
  10. Dr Obnxs

    Dr Obnxs New Member

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  11. Nathan

    Nathan Founder

    Mar 30, 2009
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    I have about 50k miles on a Random Tech cat and it's on it's way out. This is one of the better ones too, we kill these things with modded MINIs.
     
  12. jiminni

    jiminni Well-Known Member

    May 7, 2009
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    So as we know are talking cats, I have been told that there is no legal way, at least in California, to replace the OEM cat on a Mini. If the cat goes bad you need to buy a new complete OEM header. Not to mention a aftermarket header :crazy: Anyone have a good idea?

    Also my car seems to eat resonators. My first Alta resonator blew all the fiberglass out, had access to a new Alta resonator, installed it and with in a week I am seeing fiberglass on my back window :( Steve at CMS bought a muffler and resonator from Coast muffler and they use, "scrubble", as the filler. Scrubble looks like SS shavings off of a lathe that has been softened somehow? You can buy scrubble buy the pound, not cheap at I think $40. per :eek6: But it works. Wonder if you can just go to the local machine shop and buy their shavings :idea:
     
  13. Dr Obnxs

    Dr Obnxs New Member

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    In Ca

    after some year, 98 or something , I don't remember what, it is illegal to use any but the stock cat on the car. That said, what you will find is that some muffler shops won't weld up the aftermarket cat onto the car because they can get in a lot of trouble. Some places don't care as long as you cash is green. Anyway, either you find a shop that doesn't care, or you take the plates off, and take it in as a "track only" car, or you take in the part off the car.

    Now, as far as getting caught, where I live I have never, ever seen a place do anything other than confirm that a cat is in place, and most don't even do that. If it's not there the sniff test will tell.

    Matt
     
  14. Jan

    Jan Well-Known Member
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    May 16, 2010
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    It's the M45 that destroys these resonators. Have you ever stood 90deg from 50cal machine gun? It's the pulse wave that acts like a hammer that just beats the exhaust into dust. We don't have any of these issues when running the Rotrex on the car.
     
  15. Metalman

    Metalman Well-Known Member
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    From time to time, the local metal re-cycler has lathe shavings in large containers. The going rate varies based on the metals market, but you can buy this stuff for under $1.00 per pound. And now that you've brought this up, I've seen titanium shavings there as well. That would be the ticket. Higher temp resistance and much lighter weight.:Thumbsup:
     
  16. Metalman

    Metalman Well-Known Member
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    I was at the local metal recycler yesterday and snapped a iPhone pic of their SS lathe shavings (Scrubble). Selling for 1.50 a pound.
    Soooo........ Anyone want to make a muffler?
     

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  17. jiminni

    jiminni Well-Known Member

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    I'm going to have to do something soon, more and more fiberglass showing up. Wish I would have kept my old Alta resonator, would have cut it open and re-stuffed it.
     

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