cut out at high boost

Posted by gohanmoka, Dec 6, 2009
Newbie Forum - Beginner DSM modification questions and discussions. Common, repetitive, and general discussions will get dumped here from other tech forums. Unless you're a Probationary member you shouldn't post threads here.

  1. gohanmoka

    gohanmoka Proven Member

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    cranberry, Pennsylvania
    hello i have looked. but my tsi cuts out when my turbo boost to max. what would cause that?
    #1
  2. misphit

    misphit Proven Member

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    Peterborough, ON_Canada
    Please update your profile. What mods does your car have? What turbo? Injectors? Boost level? Fuel support? Tuning device? Etc...
    #2
  3. LiquidX

    LiquidX DSM Wiseman

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    New Cumberland, Pennsylvania
    Yes, we need your mod list to narrow down the reasons. It's most likely fuel cut caused by too much air and not enough fuel. BUT it could be something else like a clogged fuel filter as well. That's why we need your mod list unless you are stock.
    #3
  4. georgiaboy

    georgiaboy Proven Member

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    Covington, Georgia
    Did this happen all at once or did it get progressively worse over a period of time?
    How do your spark plugs look? Usually, when I get a cut-out on the top end (or when the boost comes on), the plugs are the first thing that I suspect. When large amounts of air (boost) and fuel occupy the cylinder, it is harder for the spark to jump the spark plug gap. The air/fuel charge act as resistance against the spark, so you MAY need to lessen the gap on your spark plugs.
    Bad spark plug wires will cause this problem, too. Check the spark plug gaps. I usually start at about .028 on the gap and decrease from there. You should not have to go below ~.025. If you go down to .025 and the problem still exists you may have another problem. Check the resistance on your spark plug wires (ohm them out).
    Also, if your battery or charging system is weak similar symptoms may surface. Make sure the alternator is putting out the proper amount of amps. Test your battery.
    Test your fuel pressure as well. You won't be able to effectively test your pressure looking at idle only. Pay attention to your fuel pressure guage when you are in boost and make sure the fuel pressure isn't dropping out intermittenly. Also, make sure the FPR is increasing (and increasing the proper amount) when in boost. Mine (I *think* most) FPR are 1:1 as far as the boost goes, so your fuel pressure in boost should be static fuel pressure (fuel pressure at idle with no vacuum/boost reference) + boost reference ratio (mine is 1 psi fuel pressure for 1 psi of boost). Stock fuel pressure is (IIRC) 43.5 psi, so at 10 psi you should see 53.5 psi of fuel pressure. If you don't see the proper increase, you may need to investigate further.
    I hope this helps. I am a newb myself to this forum, but like to help. Look at the basic stuff first, then build from there.

    -Les
    #4
  5. skatershawn

    skatershawn Proven Member

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    Austin, Texas
    im betting his all stock trying to run full boost and maxing about his maf and hitting fuel cut... more than positive!!
    #5
  6. LiquidX

    LiquidX DSM Wiseman

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    New Cumberland, Pennsylvania
    I'm guessing that too, but without his mod list then can't guarentee that.
    #6
  7. georgiaboy

    georgiaboy Proven Member

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    Covington, Georgia
    Absolutely could be hitting fuel cut, but until he updates his mods the world may never know........

    -Les
    #7
  8. skatershawn

    skatershawn Proven Member

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    Austin, Texas
    ya i didn't want to jump to conclusion, but he has 4 tech post... and the lack of knowledge by the way he asked!!

    But to the OP... Get your profile updated if you have anything to update and we can help you from there man!

    goodluck
    #8
  9. gohanmoka

    gohanmoka Proven Member

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    cranberry, Pennsylvania
    LOL i donno much about the car just got it. it has a rebuilt hed port and polished and a BOV and the stock turbo
    #9
  10. skatershawn

    skatershawn Proven Member

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    Austin, Texas
    ok... so why did you turn up the boost??
    if you dont have anything to support the amount of boost and air flow, like a safc or some kind of fuel upgrade you will out flow your MAF and then you ecu cuts the delivery of fuel.. its to help from blowing your engine and whatnot!

    so how do you even know you hitting full boost and what did you do to turn you boost up??

    id suggest you turn it back down... i wouldn't go over 14psi unless you have some type of fuel upgrade!!
    On a stock car you can probably get away with 15-16psi but i wouldnt go over 14psi like stated before!!
    #10
  11. LiquidX

    LiquidX DSM Wiseman

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    New Cumberland, Pennsylvania
    I just tell people that don't have fuel mods to not even run a boost controller and just run stock BCS or directly off the wastegate. Can't go wrong with that unless you have boost creep.

    So that's my answer for you, take off your MBC and run stock pressure since you don't know what's done on the car. With that said, you should take pictures and try to contact the previous owner for any paperwork and info on the mods.
    #11
  12. gohanmoka

    gohanmoka Proven Member

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    cranberry, Pennsylvania
    i dont have a boost controller on my car. is there a good car to get injectors out
    #12
  13. wowzers

    wowzers Probationary Member

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    Acme, Pennsylvania
    Sir you have alot of research to be doing...Please dont waste peoples time

    Your asking questions but not giving anyone any info to help you...People asked how you raised your boost level but you did not give a response so this thread is FAIL
    #13
  14. 2GaDSM

    2GaDSM Probationary Member

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    Barrington, Rhode_Island
    If your car is basically stock, I would start by getting rid of that stock 2G BOV. They are garbage even if your running stock boost. If you are not running a boost controller and still surging or hitting fuel cut when you are at full boost , I would recommend doing a boost leak test. Just a couple things to start out with. GL! :thumb:
    #14
  15. moddedgst

    moddedgst Probationary Member

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    Newaygo, Michigan
    So i have a 95 gst with a 6 bolt swap and every time i start to push boost my car bucks and I have no idea what it is? And I cannot seem to get rid of a Multiple Cylinder Misfire either and it is really starting to get annoying does anyone have an answer for me.
    #15
  16. crusindregs

    crusindregs Proven Member

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    south river, New_Jersey
    Agreed, i dealt with this bullcrap too.
    #16
  17. gpopppa

    gpopppa Proven Member

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    burnsville, Minnesota
    Do you have an aftermarket boost gauge? Or are you going from your stock gauge? and with No boost controller, Id definitely check for leaks, search how to make a boost leak tester,and go from there. Check your plugs for correct gap, and wires. But yes,the search does wonders.

    And when you say "A bov" does that mean aftermarket or stock plastic? Details please?:hellyeah:
    #17
  18. 2gdsm_nc

    2gdsm_nc Proven Member

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    Elkin, North_Carolina
    Posted in the newbie forum, he is correct in asking Here, Not everyone starts of knowing everything!!! No need to be a dick because he has a low post count, ahhummm. Not everyone posts every free chance they get.

    Now on to your problem.

    Go into the marketplace and look in the parts catalog See if you recognize any parts such as your bov and such. Next go to the Frequently Answered DSM Questions section and read as much or all you can. Get a haynes or chilton manual and read it. Every bit of info you have will help you with this car, And get used to having some sort of problem or maintenance you have to do to it.:banghead: There is alot of reasons that can cause your problem, Spark/Air/Fuel
    Some real good reading can be found here.
    1000 Already Answered Questions - Index page
    Visual Frequently Answered Questions - Home Page
    Prefered upgrade path,
    Tech Guide - DSMtuners
    #18
  19. STORTZ77

    STORTZ77 Proven Member

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    Sullivan, Illinois
    i have a similiar problem, but only in a high rpm third gear pull
    stock boost, no injectors, just intake exhaust greedy bov 16g turbo, auto meter boost gauge, fmic, and maybe some other minor thngs but nothing major
    #19
  20. j5jeffw

    j5jeffw Probationary Member

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    longwood, Florida
    Ahhh... The joys of owning a DSM, today I have 1 and by tomorrow night I will have 3. WTF am I thinking?? Anyway I had the same thing happen to me, almost felt like the TPS sensor was doing what a bad or broken TPS sensor does but I am sure it was fuel cut. I did a no no hit 18psi on a stock 14b with only a 255 Walbro an no FPR and stock injectors and MAF, which after I get off this computer I am going to install the FPR in the 93 GS with the 90 GST MotorFWD I am getting tomorrow is loaded with goodies and the 93 AWD Talon Auto is bone stock and will go to the scrap yard once I get the goods off of it unless I can sell the roller, hey for $200 bucks it is a deal I can't turn down.

    Good luck with the car and be patient, I killed my first DSM by getting crazy with it before it had any supporting mods. You will be happier in the end and have fun building it in the process.
    #20
  21. e85_4g63

    e85_4g63 Proven Member

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    Manheim, Pennsylvania
    Considering this thread is 2-3 years old, hopefully he figured out the issue... :toobad:
    #21

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