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Fluctuating power delivery in the 3000 to 4000 rpm range

AGB-S3 Oct 6, 2018

  1. AGB-S3

    AGB-S3 Active Member

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    Fluctuating power delivery in the 3000 to 4000 rpm range

    Set throttle opening , small say 1/4 max , pulls cleanly , but sometimes in the 3/4k range , there is a fluctuation in the power delivery , either a sudden soft increase , or as to day on the shopping run , a waver in the power delivery , Then pulls fine , no error codes , idle fine ,

    Occasionally , smooth acceleration , to round 4k , then as if the boost had been dumped , looses power..been like this for a while now , nothing ever shows during service etc ,

    Any thoughts ?
     
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  3. Stuart B

    Stuart B Well-Known Member

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    can't you log it on a hard pull? It seems like you are testing slow acceleration, with no load the turbo wont be interested in giving you any power will it..?
     
  4. AGB-S3

    AGB-S3 Active Member

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    The last episode was under load, accelerating round a left hand corner , off a r-a-b , decided to have about of wavering power delivery ...sometimes there's very little , then 'cuts in ,

    assume , by logging, you mean get a copy of vag-com , ive a blue tooth dongle , links to the phone, but , guess , need the hard wired version ??
     
  5. Stuart B

    Stuart B Well-Known Member

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    Android torque can do some logging.

    If you have a blue kkl then me7logger may work, that's got to be the best logging tool for these ecu, didn't work on my AMK S3, worked great on my BAM TT
     
  6. Stuart B

    Stuart B Well-Known Member

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    Is your traction control light flashing at the same time add the power loss?
     
  7. AGB-S3

    AGB-S3 Active Member

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    lol funny you should mention that , well had that a couple of times over the years , bit of a spoiler , but that was only during the 'odd extreme event , I thought that , but when that fires its a full drop in power ..

    I think the plug in dongle is green , only use it with the torque app , its bam engine , face lift , believe serial cable is needed for the proper vag-com ?
     
  8. Stuart B

    Stuart B Well-Known Member

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    You don't need vag-com to log the car.

    Me7logger is much better.

    But android torque pro version can log the car too, but only really a couple of samples per second.

    A kkl lead only works work vcds lite and vcds register, a real vag com cable has a chip built in. But a blue kkl also works with me7logger.

    I have some examples of files to show later. I cant remember where i uploaded them too.
     
  9. AGB-S3

    AGB-S3 Active Member

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    Clean run today,

    The ME7logger , is that windows only or will it run on android , what about the blue-tooth link is that suitable
    can upgrade to torque pro , but , is that going to do the job with the blue-T dongle as the link ?

    spent so long undoing the previous owners doing's , this has sort of been side lined , is it possible to tell if the car has been mapped before ?
     
  10. Stuart B

    Stuart B Well-Known Member

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    me7logger is a windows program and it only works with a real cable - a blue-tooth adapter simply cannot pass enough information.

    android torque pro is only a couple of quid and you can create CSV files with a handful of sensors may every 500ms (1/2 a second)

    me7 logger can go up to about 20 sensor readings every second. (50ms / 0.05 a second) <-- I think it is capable of going down to 20ms with the right cable.

    example of me7logger content - this is 1.5 seconds of me7logger content

    upload_2018-10-8_21-15-29.png
     
  11. AGB-S3

    AGB-S3 Active Member

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    50 mS , 20 reads a second , thats a lot of reads ..

    What cable is needed ???
     
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  13. Stuart B

    Stuart B Well-Known Member

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    I use a cheap blue kkl £5 from eBay, the same cable can be used with vcdslite .

    If you use a can/hex lead it apparently can go to 50 reads a second ( 20ms ).

    But remember the warning that some cars just doing work, my S3 didn't work even though the same ecu worked perfectly on a bench, the developer nyNet @ nefmoto said that some Audis do not have the k-line wire directly to the ecu causing the issue. Its definitely worth a try though. There's then a graphing tool that uses these files to create bhp torque graphs.

    NefariousMotosport forum has all the details on setup.
     
  14. badger5

    badger5 www.badger5.co.uk Site Sponsor

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    to me logged is'nt better for majority of folks..
    you need to know what parameters to look for, and then know what does this all mean.. Copious amount of data... to get confused by for the majority.
    Its also logging, non graphical, so "after the event"... which as an example of excessive timing pull, you would only know after the run when reviewing the data to realise oh sh1t, it was pinking its brains out... or running crazy lean etc... Both of which are potential engine damaging scenarios. VCDS is at least simple, and real time visible with logging.. so you can catch the moment as its beginning and take appropriate action.. (lift off/abort the run)

    my 2p
     
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  15. hydro s3

    hydro s3 S3 amk Team Ming Blue Audi S3

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    I got a cheap cable of eBay a while back and had vcd lite but it will not work on my car but works ok on a mates.
    If funds are there is say get the proper cable and full version of vcd.
     
  16. AGB-S3

    AGB-S3 Active Member

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    VCDS is at least simple, and real time visible with logging.. so you can catch the moment as its beginning and take appropriate action.. (lift off/abort the run)

    Im seeing this at £225 and USB cables vcds lite at £67 , on ebay etc, these are BLUE in colour , but , am I looking at the right things ? what constitutes a 'real vag come cable' ?
     
  17. Stuart B

    Stuart B Well-Known Member

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    Visual Me7Logger shows the current readings of all the sensors you have selected - but to be fair I am looking down the road - so it's only helpful on a dyno (I am pretty sure they have their own super-dooper kit) or with a passenger.

    If you are going to get a fake VAG-COM installation dont be spending £67 they are £14 on eBay. otherwise full kit is $225 or I think you can do logging with a registered version of VCDSLite


    the same me7log put into ECUxplot (you cannot necessarily trust the power data as the gap between wheel and crank is a constant and the bhp/ft_lb is also manipulated by other constants)

    upload_2018-10-10_22-46-1.png
     
    Last edited: Oct 10, 2018
  18. rob1981s3

    rob1981s3 New Member

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    Sorry to get in on this old post chaps, did you ever resolve your problems AGB-S3?
    I have had similar problems, and think i have logged my amk s3 going lean about 3-4k rpm tonight.
    possible fuel delivery from pump as not long put a new fuel filter on :culpability:
     
  19. AGB-S3

    AGB-S3 Active Member

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    Good question , was it the lateral acceleration sensor ? , causing the traction control to reduce the power , after a series of sensor changes , which eventually eliminated all the error codes , the last was the lateral sensor, which, was causing the system to do 'funny things ' like dropping power , when negotiating a roundabout* , or applying the rear inside brake* when taking a sweeping right hand bend at 20 mph ..then * bringing on the orange triangle , left side display .....no longer any fault codes , no longer any odd behavior .....
     
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  20. rob1981s3

    rob1981s3 New Member

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    Glad to here its sorted! Mine seems to lose power after the ECU has learnt long term trim.
    If I disconnect then reconnect the battery, it resets and goes like stink for a few days.
    I have no codes, so I am trying to learn to log (effectivly anyway)

    Last night around 2-3000rpm my lambda logs show it going really lean, I'm expecting it to be the fuel pum! but need to make sure it's not exhaust gas temp, shedding fuel, as this is something I have recently read on here!

    I'm learning a lot, thanks for the reply


    Sent from my SM-G950F using Tapatalk
     
  21. AGB-S3

    AGB-S3 Active Member

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    The lateral sensor was also linked to brake pedal sensing switch as well , most of the fault codes , where only accessible with full vag set up, the car needed to be re-set on level ground once the sensor was fitted as well , there where also flags from ex gas temp , need new item , and solenoid vac valve , cleared with new parts, fitted new cam positions sensor , as ' the voices told me to replace it' that's when the 3 year old damaged, loose , cam belt and weeping water pump was spotted .. new belt kit and pump + tensioner fitted

    Morel of the story , allays do what the 'voices ' tell you , oh , and keep £1,000 in the fix it , Easter egg account ... probably the first time its run properly since picking the car up ....
     
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