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A couple of questions after a local ASN meet yesterday ...

Discussion in 'A3/S3 Forum (8L Chassis)' started by S3 Paul, Feb 4, 2013.

  1. S3 Paul
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    S3 Paul Well-Known Member Regional Rep

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    I took my son to the local meet yesterday ( nice to meet a few of you)
    after talking to Dan I was left with a couple of questions in my head...
    1. When doing the N249 bypass I was told it needed to be left electrically connected but not piped up?
    my car is face lift and dans is not if this makes a difference. He didn't have it fitted and the plug was just sat there?
    Do I need the valve in place? I thought I did? He reports no loss in performance,
    2. Regarding catch can location...
    Mine is located on the Side of the battery box, his slightly higher, but he was told by another member on here that the can needs to be as high as the rocker cover breather outlet?
    is this true? Why?
    the pipe back into the tip ( before fitting a catch can ) is lower that the rocker cover .
    i have no problems that I know of with my set up...
    #1
  2. superkarl
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    superkarl MAN OF STEEL

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    1. It will throw codes and lights if not connected. Leave it connected imo.

    2. Dunno what all those ideas are about. The breathers just need somewhere to go, doesnt really matter imo
    #2
  3. S3 Paul
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    S3 Paul Well-Known Member Regional Rep

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    These are the same replays I gave on the day... But I'm not always right...
    I'm sure tuffty said leave it connected, so I did,
    breather wise... I said venting directly to air would be ideal but messy. So why does it matter where the can goes?
    #3
  4. Prawn
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    Prawn My other car is a MINI!!!!

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    Is Dans me7 and yours ME7.5? if ME7 is half as dumb as me3.8 it'll never throw a light for anything where me7.5 throws a fit if you wear the wrong colour socks....

    I was always led to believe that removing an N249 or N112 without leaving the valve plugged in would stop fuelling adaptations from taking place.

    Not sure if this is the case with a resistor in place or not, but I'd like to find out for a mate also.
    #4
  5. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    This

    But correctly resistored will also work fine.
    #5
  6. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    If the catch can is lower than the cam cover it will fill very quickly
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  7. Prawn
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    Prawn My other car is a MINI!!!!

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    mine doesn't fill quickly at all, on the side of the battery tray.
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  8. turnstyle
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    turnstyle Member

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    mine doesnt fill fast either - and as with prawn, its on bolted to the battery cover.

    havent drained mine in couple of weeks, and a check over the weekend shows its only about 1cm full
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  9. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    Thats fine at battery tray level but never go lower
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  10. Gops
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    Gops 6th gear @7000rpm

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    Just bought the same catch can as prawn :) hope it works!
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  11. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    Just to add, i have left the n112 valve connected as when welly disconnected this, it messed fuelling up big time, the n249 on the other hand is totally removed and fine.

    Yes Nick mine is the APY s3 so has the ME7.

    Also pauls catch can is lower than mine but mine fills up on a regular basis, and its not a cheap one, its the expensive one we all got in the group buy.
    #11
  12. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    ...whilst pulling more current than ecu would drive into a solenoid
    #12
  13. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    Surely that so long as the correct value resistor is selected, it will be fine?

    The solenoid afterall just presents a resistance to the ECU...
    #13
  14. S3 Paul
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    S3 Paul Well-Known Member Regional Rep

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    Rather than mess about with resistors i will leave well alone.
    My catch can has been on a good couple of months now and i havent had to empty it yet. I will check at dinner time but ...it was clear after a month.
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  15. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    If you have the valve why buy a resistor? extend the wires to the valve and hide it out the way if going for a tidy bay... I put mine in the plastic housing where most people fit catch cans but have also secured N249's under the inlet manifold as there is a handy bracket on the oil filter housing

    Resistive loads present differently to inductive loads is my understanding... current draw can be different... I would rather just use the valve than a resistor having the choice...

    <tuffty/>
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  16. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    inductive load
    resistive load

    do the n112/n249 solenoids ever feel "warm" to touch? = No
    do the n112/n249 resistors ever feel "warm" to touch? = Yes

    now ask yourself why?
    #16
  17. Prawn
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    Prawn My other car is a MINI!!!!

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    Glad the topic has gone this way.

    My mates Ibiza has resistors in place of the N112 and N249 valves, and also has all sorts of crazy manner of fuelling issues (fuel pump most likely)

    I suggested he refit the valves electrically but leave the plumbing as is.
    #17
  18. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    The oft touted resistor value is 330ohm, which will sink about 36mA, and dissipate about half a watt at 12v.

    One would imagine that even if the stock resistance of the coil was 330ohm, the much larger N112/N249 valve would take a LOT longer to heat up, due to its much larger thermal mass, and would also dissipate heat more readily, given its much larger surface area. Surface temperature alone therefore is no indication that its somehow drawing more current.

    Theres also not much in the way of inductance in a steady state DC load, inductors essentially appear as shorts when supplied with DC...
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  19. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    you presume they are steady state and not pwm switched to activate

    Reality is many "resistored" sensors I see come thru here are hot as hell... some melted into adjacent wires they got so hot..
    Never see the original solenoids get warm..

    and.... in ibiza's, I dont believe its a coincidence I see many with lambda b1s1 malfunction in circuit errors on cars with resistored out solenoids. When/If I get a mo one day I will just stick the DVM on amps and do such a test to confirm actual current draw the ecu is having to switch out. (switches to ground to turn things on generally)
    #19
  20. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    I think his issue is pump.. ibiza pumps suk
    unless he has b1s1 malfunction in circuit error, in which case it may fuel adjust +25% randomly.. Not found the cause or solution for this either.. and tried many many things..
    #20

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