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Thread: same old issue keeps on coming up NEED advice

  1. #21
    Guest BLAKTOOTH's Avatar
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    Quote Originally Posted by Hugh Janus View Post
    The car feels sluggish and laggy, given it should be circa 350 ish my mates 300bhp BMW literally out runs me.
    I think that's just your driving grandad

  2. #22
    Guest Hugh Janus's Avatar
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    Hahaha, cnut X

  3. #23
    Guest Hugh Janus's Avatar
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    Quote Originally Posted by autosri View Post
    If you google it there is a chart for z32 voltage vs approx hp if you plug in the consult and get someone to watch the screen while you give it some you will see if the voltage is close to your expectations
    don't suppose you have a link for the chart, ive spent evening looking for it but cannot find it

  4. #24
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    I can’t find it either there was a nice chart showing numbers

    Best I can find is this the numbers seem to look familiar

    http://sxoc.com/vbb/archive/index.php/t-238450.html

  5. #25
    Engine Builder Mark's Avatar
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    Who mapped it?
    Quote Originally Posted by silverzx View Post
    I like Mark, he seems fair.
    Quote Originally Posted by Slip_n_slide View Post
    Mark is right.

  6. #26
    Guest Hugh Janus's Avatar
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    Quote Originally Posted by Mark View Post
    Who mapped it?
    It’s on an HDev 3a (which as we all know is very rich anyway) when it was tweaked this was also done at HDev but they couldn’t offer any reason to why it was running lean..

  7. #27
    Guest Hugh Janus's Avatar
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    Worth noting;

    I can bypass the SAFC which it still runs lean, runs literally 10x better doesn’t bog down, overfueling is reduced to a more normal level

    With the SAFC connected it’s overfuels massively (eye stingingly so) bogs down feels shit and idles badly and still runs lean

  8. #28
    Guest Hugh Janus's Avatar
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    i don't think its fueling, the tweak was masking an underlying problem, disconnecting the SAFC is revealing it, i can't help but feel given that i simply moved the wiring out of the way when i changed the filter made it run from its usual 12.AFR to 14AFR

  9. #29
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    I wonder if the afm wire is picking up some interference, im sure as standard it has like a wire over braid to protect it.

    have you tried rewiring it?

    your turbo hasn't melted the wires has it?

  10. #30
    Guest Hugh Janus's Avatar
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    I’ve only rewired the earth which I did a few weeks back, as for melting the wires I would say no but I will look

  11. #31
    Guest immy21's Avatar
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    Tested for 5v at the maf?
    Continuity tested earth's?
    Bare in mind 1 of them is sensor ground, test with another sensor ground, tps etc think the other ground is chassis ground, can't remember.

  12. #32
    Guest BLAKTOOTH's Avatar
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    What do your spark plugs look like and what one's are you running?

  13. #33
    Guest Hugh Janus's Avatar
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    The plugs are 8’s and the tips look very light grey whilst the ceramic is pure white and the shoulder of the thread is sooty.

  14. #34
    Guest Hugh Janus's Avatar
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    here are a couple of pics of one of them, when i first put the plugs in in May after hundred miles or so:



    then when i inspected in August:


  15. #35
    Engine Builder Mark's Avatar
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    Why are you running a 3a chip and a SAFC? If it runs better with the SAFC disconnected then surely thats the issue?
    Quote Originally Posted by silverzx View Post
    I like Mark, he seems fair.
    Quote Originally Posted by Slip_n_slide View Post
    Mark is right.

  16. #36
    Guest BLAKTOOTH's Avatar
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    Quote Originally Posted by Mark View Post
    Why are you running a 3a chip and a SAFC? If it runs better with the SAFC disconnected then surely thats the issue?
    I concur. Bin off the SAFC...and take your car to Martin

  17. #37
    Guest Hugh Janus's Avatar
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    Ok....

    the SAFC was hardwired years ago before I went 3a.

    Once 3a was installed the SAFC was wiped and purely used as a knock meter, it wasn’t used to adjust fueling or anything just knock as it was easier to leave it in situ rather than removing the wiring.

    So when I had my 14a loom spliced with an S15 loom as the SAFC wasn’t really doing that much was decided to just leave it in situ again but crucially a bypass wire was put in so I can if needed totally and utterly turn the SAFC off and the car would still run (ordinarily turning off an SAFC would mean the AFM is effectively turned off/disconnected, meaning car won’t run properly)

    Now, when it went to HDev initially they found it was running lean without the SAFC turned on so they suggested turning It on and tweaking the fuel to make it safe again which I agreed to.

    So basically on 3a (no SAFC) it was found that the engine was running lean, oh and was found actuator was weak and made a total of 311 at 1.1bar but it felt dog slow

    Engine went bang a few days later.

    New engine put in, disconnected SAFC it runs lean (12sAFR) change and check loads of things still the same.

    Turn on SAFC overfuels like an absolutely mofo but still running lean on boost.

    This is when I tried somebody’s Z32 AFM (without SAFC on btw) and it went straight to 11.5 as it should which prompted me to buy a new Z32 put that on and AFR’s still at 12s last weekend changed the airfilter moved only the z32 plug and wiring (didn’t even unplug the AFM) out of the way whilst fitting on way home AFR s at 14+

    So whilst the SAFC isn’t doing much and in most cases it’s turned off but it runs lean regardless and moving the wiring affected the AFR’s massively
    Last edited by Hugh Janus; 27-11-2017 at 09:28.

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