Looking for a great tuner desperately...
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This is a discussion on Looking for a great tuner desperately... within the Tuning: Electronic Engine Management forums, part of the Tech & Modifying & General Repairs category; Hi, I have a 2007 WRX STI tuned for ~300whp. Engine is forged, using CP pistons, rebuild because of a ...

  1. #1
    Registered User
    Join Date
    Apr 2008

    Unhappy Looking for a great tuner desperately...


    I have a 2007 WRX STI tuned for ~300whp.

    Engine is forged, using CP pistons, rebuild because of a crack in 4th. Have CAI, 20g turbo and 750cc's with a custom remap and varex muffler. Stock TMIC.
    I also have a AEM wideband next to defi EGT, boost and fuel press.

    When remapped, or battery disconnected for a reset, the car is almost perfect for a 100 km or so, then a slight hesitation starts building around ~2500 rpm before AFR goes crazy and car feels jumpy, sluggish, meaty, unresponsive and under powered after about another 100 km. I've been reading and reading and reading and trying to learn from forums, my tuner and my mechanic and I'm about to go crazy.
    At WOT no hesitation but under powered

    We've changed MAF, both o2's, checked for pressure lost for both intake and fuel.

    People all around forums seems to be frustrated about the same problem.
    08+'s are changing their fuel system with '07 ones trying to get rid of the hesitation, putting o rings or adding capacitors to dumb down the knocking sensors, playing with AVCS settings and so on.
    The most two common reason seems to be the remap or knocking sensor picking false knocks because of the extra vibration brought by different parts like a loud exhaust system.

    I'm almost at the verge of selling my car.
    I need a REALLY good tuner to help me out, if he can, remotely.
    I'm willing to cooperate for any data requested.

    Can you help me?

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  3. #2
    Registered User
    Join Date
    Mar 2013
    I use Eric from Torqued Performance. VERY happy with his tunes and customer service.

  4. #3
    Master Baiter EJ257's Avatar
    Join Date
    Aug 2007
    On a stream bank somewhere
    I Support ClubWRX
    Who is your tuner? What do they say about the hesitation?
    2016 Toyota Tacoma TRD Off-Road - Daily
    2005 WRX STi (Mods | Virtual Dyno) - Toy

    Resident Tuner @ WTF Tuning

    "Never trust anything that bleeds for a week and lives ..."


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  6. #4
    Registered User
    Join Date
    Jan 2014
    Portland, Oregon, United States
    This is kind of on topic tho its not giving you any answers.. Do you need to retune your car if the battery disconnects?

  7. #5
    Registered User
    Join Date
    Apr 2008
    @georgia-wrx Thank you, I'll try and contact him.

    @EJ257 my tuner is local, I'm located at Turkiye. He says everything looks fine with about max %1 knocking under continuous acceleration which he also says is negligible. AFR is perfect at all throttle positions after the reflash. TBH he does not have a clue after what happens.

    @hawkeye26 I don't need a retune after battery disconnection. I just disconnect the battery, pump the brakes a couple of times, reconnect, and BAM!, its working like its brand new. Only for a while though...

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