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Optical

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Posts posted by Optical

  1. Hey all

    Im trying to trouble shoot an EJ20G setup in my v2 wrx ****box runabout

    Current behaviour is it severely lacks torque. From the sound of the engine and turbo behaviour it appears the ECU is pulling all the timing out of the engine. Revs slowly, makes lots of wooshing and hissing noises but goes nowhere.

    Engine will also not rev past 4000rpm

    Typical limp mode behaviour?

    Funny thing is, it will behave like this straight after an ECU reset. I'd expect things to work properly if no fault code is bought up.

    Maybe the cam belt has jumped a tooth or something? Although I didnt think this would cause a 4000rpm limiter of sorts.

    Any ideas?

  2. I dont have anything particularly constructive to add other than I stripped a v7 engine once that had white and partially melted exhaust valves from running very lean due to a valve seat leak. Best to do a leakdown test or similar if you suspect they could have been bent

  3.  loner said:
    My clearances are small but I've measured them with the heads off

    and I'm wondering if the clearances will increase when the head in

    torqued down to the block?

    I have only measured one side so far, but I've got .005" to .006"

    for the intake and .007" to .008" for the exhaust. Standard is supposedly

    .008" for the intake and .010" for the exhaust. I read somewhere the

    clearances could be reduced by by .001 to .0015 for an aluminium block

    and head... also that smaller clearances was a trick to have bigger looking

    cams.

    Thoughts?

    Mine changed a little when i torqued down my last head, the deck isnt perfectly flat (but still in spec) anymore though which may have contributed. Depending on what buckets you have it's not too big a deal to sort out clearances once the heads are torqued up

  4. Once you fabricate a setup to fit the gt35r and find it to be too laggy, it's easy enough to switch to a smaller t3 flanged turbo that will be great...

    I can sell you a real gt35r 63 that's in good condition for a reasonable price.

  5. i havent got my bits back from a friend who borrowed them.. over a year ago

    that log was messing about on the motorway iirc, i should fins a log from the track, wasnt that laggy but the 63 is def much quicker to get going...

  6. The dccdpro g sensor is 2-axis which means it cant tell the difference between lateral G force, road camber and bumps. Also the response is not really tuneable. To make the thing work properly is a perilous exercise. Good marketing on his part but it's smoke and mirrors.

    MapDCCD has a 3-axis accelerometer, it can distinguish lateral g from everything else happening to the car, doesnt need to be mounted flat and of course the response can be tuned so you can mount it wherever you like. We also do a dash cluster driver...

  7. The static torque split is made by a planetary gear system - this works independently of speed and diff ratio and also allows the dynamic torque split to vary depending on f/r wheel traction. The centre diff operates to mitigate the dynamic torque split.

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