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Spark plug temperature comparisons (6's/7's/8's) - S3 2.0T (8P2)

Discussion in 'A3/S3/Sportback (8P Chassis)' started by warren_S5, May 15, 2010.

  1. warren_S5

    warren_S5 Moderator
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    Those plugs are way too cold, at this time of year in UK climate I would only run 7's

    The ones I recommend in that link are 7's. If you read the detail in the thread you'll see why I gave up on oridiums and have never gone back (and never suffered since)
     
  2. Poma7

    Poma7 New Member

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    Right just refitting my 100 mile old PFR7S8EG see how we go thanks warren appreciate it
     
  3. Poma7

    Poma7 New Member

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    Still got flutter at 5k with those plugs in. I've just ordered a set if denso ik24s to try I live in hope! Really doing my nut I'm now!
     
  4. warren_S5

    warren_S5 Moderator
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    Also check:

    Coil packs
    HPFP cam follower
    Fuel rail pressure readings
    Diverter valve
     
  5. Poma7

    Poma7 New Member

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    fitted ik24s and all was fine at first, also changed cam follower as precaution although old unit looked fine. ran ok for couple of months, (i dont do many miles) now fault back again. I just know when i remove plugs they will be black again! can you tell me how i go about checking diverter valve? and how to take fuel pressure readings via vagcom. thanks
     
  6. warren_S5

    warren_S5 Moderator
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    Fit the right plugs and you won't need to check anything else.
     
  7. s3_trev

    s3_trev 3 door or no door!

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    Hi Warren, sorry if I am being thick here. Ive just read through this thread and I cannot see where you have recommended a non-iridium plug? I see you have listed the BKR7EIX and BKR8EIX which are both Iridium, so I can only assume that when you changed from Iridiums and have had no problems since, you were talking about the R7434-8? Which you say are not recommended for fast road use. So I admit I am confused.
     
  8. Poma7

    Poma7 New Member

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    Same trev, I have tried all iridium and the Recommended PFR7S8EG plugs and still have the stutter at 5k granted I've not run the PFR7S8EG long enough to see if they foul up but the point is it's still hesitates at 5k with those in. I will refit these now and try them which I'm sure will eliminate my low end misses but will still hesitate at 5k ill also scan the car on vagcom for codes and report back findings thanks
     
  9. Poma7

    Poma7 New Member

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    image.jpg done some fuel rail pressure readings on vagcom yesterday after refitting PFR7S8EG plugs and getting rid of the crazy low end misfires. the graph below shows RPM V Fuel pressure readings. taken from 2k rpm to 6ishk rpm there seems to be abit of a dip around 5k where my hesitation is anyone have any more knowledge on this? thanks
     
  10. s3_trev

    s3_trev 3 door or no door!

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    Id think about upgrading your fuel pump if you haven't already.
     
  11. Poma7

    Poma7 New Member

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    trev, im running a ttrs yellow top, intank low pressure fuel pump, and hpfp is autotech internals.car is stage 2+ roughly running approx 400bhp so should be suffiecient and has run fine with this setup previously.
     
  12. nluk100

    nluk100 Active Member

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    I've been running BOSCH F5DPOR (aka Audi RS2 plugs) in both the modified ed30 and S3 and never had a single mis-fire / issue.
     
  13. Poma7

    Poma7 New Member

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    what other mods do you have on s3 nluk? thnks
     
  14. Poma7

    Poma7 New Member

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    anyone tell me if my fuel pressure log looks ok? looks to be dropping off at 5krpm to me is this normal?? thanks
     
  15. RedDejavu

    RedDejavu Well-Known Member

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    fuel pressure is all over the place, what mods do you have? May need to fit uprated fuel pump
     
  16. nluk100

    nluk100 Active Member

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    Both cars were/are stage 2+
     
  17. nluk100

    nluk100 Active Member

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    Can you log requested vs actual fuel rail pressures and graph them? This might highlight your problem better.
     
  18. Poma7

    Poma7 New Member

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    already running two uprated fuel pumps low pressure(in tank) and hpfp internals (autotech) yes i can do that log nluk do you know what measuring block requested fuel rail pressure is?? and ill log it and graph it thanks
     
  19. nluk100

    nluk100 Active Member

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    Engine module, group 230 IIRC.
     
  20. warren_S5

    warren_S5 Moderator
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  21. Poma7

    Poma7 New Member

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    rs4 fuel valve is already fitted to my car, tried gapping other iridium plugs down to 0.7mm changed cam follower to rule out about 6 weeks ago, for genuine item from tps. even though original looked fine. ill do some logging on fuel req v actual when i get a spare minute. thanks
     
  22. s3_trev

    s3_trev 3 door or no door!

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    Did you do the conversion yourself?
     
  23. Poma7

    Poma7 New Member

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    No Trev this was carried out before I bought the car by storm developments I have the receipt I'm happy to check hpfp if you have any advice of things to look for thanks
     
  24. s3_trev

    s3_trev 3 door or no door!

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    Ah ok its probably fine then mate. I have always read that you need to be very clean when doing the autotech internals but I would say they were.
     
  25. Poma7

    Poma7 New Member

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    I'd like to think so! There supposed to be really good and know what there on about but never dealt with them myself
     

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