air flow meter
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Thread: air flow meter

  1. #1
    Fellow Frogger! amcc's Avatar
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    Icon5 air flow meter

    got 2 205's one on road one not. and i also have 2 air flow meters. but one dont work... any ideas on what i can try to get it going before i give it to a pro?

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    i have heard that you can tune for a voltage b/n the afm housing and wire #22 which is white and comes off the longest part of the engine loomb. think it was 9.25 volts. however i checked the one that works and it was 5.__ has anyone heard of this? is it worth just having a play with the screw on the outside and even opening the lid to c what can be done with what lies beneath?

    for any help

    Andrew
    French - 92 205mi16, 87 205gti and spares
    Other - Amarok V6, Iveco Daily 50C17, Isuzu 600

  2. #2
    Fellow Frogger! bazgti's Avatar
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    open it up to have a look.
    usually the metal track on the curcuit board wears away and they dont work properly.
    im not sure that you can fix that problem
    just remember to mark it before you take it apart.
    ive heard of getting them recalibrated for about $350 but i think the track has to be in good nick or it wont work properly.
    ive seen them on uk ebay go for about $200 aussie bucks.
    ive even seen a brand new one go for $350 aus.
    the problem is they dont come up often for earlier series gti"s
    and also there is a different one if you have cat convert.
    but if you have a later series gti,youll get one no probs.
    the later series dont have the allen key fuel mix adjustment like the early ones have
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  3. #3
    1000+ Posts Luca's Avatar
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    Mate spend the money and get it done by a pro and they end up working really well.... I've had mine done and it's the ducks nuts.

  4. #4
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    Quote Originally Posted by Luca
    Mate spend the money and get it done by a pro and they end up working really well.... I've had mine done and it's the ducks nuts.
    Or you could buy a Megasquirt for the same money and just do away with it.
    A bit of work though.
    I have a 130hp (Euro Spec) AFM if you want to give it a try. I think I'll hang on to it though just in case I want to reinstall it for originalities sake later on.
    I also have a BX TRi AFM which is available for sale, should be the same as for 75Kw 205 engine and was working fine.
    Graham

  5. #5
    1000+ Posts Luca's Avatar
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    If a fully mappable injection system was an option I'd get a Motec put in and get a truck load of improvement in performance, drivability and economy.

  6. #6
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    Quote Originally Posted by Luca
    If a fully mappable injection system was an option I'd get a Motec put in and get a truck load of improvement in performance, drivability and economy.
    The Megasquirt is fully mappable and if you get the Megasquirtn'spark upgrade (software only as it uses the existing cold start solenoid output) it will do spark as well and give you a 12 by 12 fuel VE map.
    Graham

  7. #7
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    ok new bosch AFM's can be purchase in Germany, 0 280 202 202(jaz), ...202 097(j1), the 2 i asked about. this was about 2 mths ago tho. price incl. post wasnt too bad for a new item.
    Puggy.

  8. #8
    1000+ Posts Luca's Avatar
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    Quote Originally Posted by GRAHAM WALLIS
    The Megasquirt is fully mappable and if you get the Megasquirtn'spark upgrade (software only as it uses the existing cold start solenoid output) it will do spark as well and give you a 12 by 12 fuel VE map.
    Graham
    How much?

  9. #9
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    Quote Originally Posted by Luca
    How much?
    It costs $200 landed for a kit of parts.
    You need to add TPS, manifold temp and O2 sensors.
    This is assuming you already have EFI.
    If not you need to add the fuel system including EFI injectors. And of course manifold and throttle body if modifying a carby car.
    I haven't looked into the spark side fully but the Megasquirt'nSpark appears to be just a software update available free. There are a few different spark systems all designed by Megasquirt users themselves.
    The official updated Megasquirt will be available in the near future I believe.
    Have a wade through the Megasquirt web site.
    Graham

  10. #10
    1000+ Posts Luca's Avatar
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    And the difference between that and a Motec?

  11. #11
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    Quote Originally Posted by Luca
    And the difference between that and a Motec?
    The Motec would have available a more precise adjustment of mixture and timing due to larger VE and advance tables. There is likely to be more special features, such as staged injectors etc.
    For a simple conversion of a carby or pre Motronic engine the Megasquirt does the job perfectly well.
    The new Megasquirt may well be just as good as the Motec.
    You will need to have a look at the Motec features then go to the Megasquirt website and compare.
    Graham

  12. #12
    Real cars have hydraulics DoubleChevron's Avatar
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    Quote Originally Posted by Luca
    And the difference between that and a Motec?
    I'd say the difference is several thousand myself
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  13. #13
    1000+ Posts Luca's Avatar
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    Motec ultimately has better circuitry and race engine experience...

  14. #14
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    Quote Originally Posted by Luca
    Motec ultimately has better circuitry and race engine experience...
    You would only need this for the high spec engines where very precise control is needed.
    For an 8 valve engine to fast road or rally specs the original Megasquirt is more than adequate. I will be trying out the Megasquirt'nSpark upgrade on my Series 1 205 (Series 3 engine), but in stages, get it going with original Jetronic, progress to Megasquirt with original distributor then to Megasquirt'nSpark.
    I don't think this engine would warrant any further improvement in engine
    management.

    I have converted two engines to Megasquirt and both went very well (a huge improvement with the 505 GTi engine) and no tuning hassles.
    Graham

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