Single plug lowboost vts

  1. Newbie Joined: Jan 2017 Portugal Posts: 4 Saxo vts
    #1
    Sorry for the question but i did search and didnt got un anser lol i plan to lowboost a saxo vts at 8 psi, my mechanic told me he can map original single plug with that boost, its a budjet built for now and later i wantto upgrade ecu and pistons.
    Could it be mapped to work with boost? What have to be modified? Map with more kpa ??
  2. Saxperience Forum Bum Joined: Oct 2004 South Posts: 3638
    #2
    A standard ECU can be remapped. Message the user - Chipwizards
  3. Frequent Poster Joined: Nov 2009 Posts: 576
    #3
    Yes, that guy^ :-)

    The tricky bit with the single plug is that it uses the MAP sensor as a barometric sensor until it is in 'run' mode. This means it will consider the sensor to be 'faulty' when you fit a 2.5 bar sensor because the reading it sees is implausible.
    You have to work out how to get around that before you can map them to take boost.
    That asside, and with the injector scaling corrected for bigger injectors, they map much like a normally aspirated job.

    Renault R26R injectors work perfectly fine in them.
  4. Newbie Joined: Jan 2017 Portugal Posts: 4 Saxo vts
    #4
    So i cant have boost readings for the single plug ecu wright? But can map fuel and ignition and it will work with low boost??
    Thaks for the help ��
    The opel calibra turbo injectors dont work? A friend has a set of them that e told he could give me if this work. That way i could save some monney for the other parts
  5. Frequent Poster Joined: Nov 2009 Posts: 576
    #5
    Think more like 'Do it properly' than 'save money', that way you save money by only doing it once.

    Calibra injectors are EV1 style and probably would be physically too big anyway.

    The MAP sensor isn't calibrated like that in the single plug (it's just a voltage, not converted to a pressure). There will be an output constant for the live data if you feel you NEED the live data for boost to be accurate but I spent a very long time looking for it and didn't find it. There are over half a million bits of data, 64,000 bytes, and it could be anywhere in that lot. Very few scan tools give live data beyond rpm anyway on these cars, unless you get a PSA-specific coding.

    Three Plug ECUs do have MAP sensor calibration into actual pressure values, so you can have actual pressure on the live data stream. There are other things to trip you up in a three-plug though. Enjoy. :-)
  6. Newbie Joined: Jan 2017 Portugal Posts: 4 Saxo vts
    #6
    So your sugestion is to use a 3 plug ecu �� how about using a megasquirt, saw some on ebay i just have to built them, was thinking on that as a upgrade after the car runs on low boost :-)
    so in injectors shoul focus on 300cc+ at 3 bar, would it be suficiente? Using the original ecu i want to run a afr value like 10, downt wanna brake it on first ride �� i saw some formulas when i was searching information on forum i do the math for 240hp it show me 400cc+- on 80% duty is it correct? My friend have a calibra turbo motor on a tigra with some upgrades, he sais its too mutch in his opinion but could be diferent becouse they arent same engines ��
    When the turbo comes i will open a post of my project, if you guys can help me a bit on the built i would be very thankfull ��
  7. Frequent Poster Joined: Nov 2009 Posts: 576
    #7
    Single plugs work perfectly well, and much better than any unreliable MS.
    You just don't get correct live data for boost.
    If your mapping man knows what he is doing he should work it out.
  8. Newbie Joined: Jan 2017 Portugal Posts: 4 Saxo vts
    #8
    Ok :-) tks for all the help, i will open a project post soon hope you pass there and comment ��