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  1. #1
    Active Member One Ring
    Join Date
    Aug 09 2018
    AZ Member #
    423973
    Location
    New Zealand

    Stage 3 S4 Boost Issue

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    Hey Guys, iím having some problems with my s4. itís stage 3 and has the following upgrades


    Stage 3
    23psi low tune on 98
    Forged rods, pistons, arp bolts
    Crank, conrods and thrust bearings upgraded
    JHM Motorsport RS6 RS Turbos billet wheels
    JHM R series Lightweight flywheel and clutch
    SRM intercoolers
    3Ē down pipes to full 3.5Ē exhaust system
    034 motorsport 2.0t coil conversion with plugs
    hpx maf sensor with 3.5Ē induction pipe
    3 bar map sensor
    750cc injectors
    700hp fuel pump
    gates racing timing belt

    I purchased a ECS boost guage for it and itís only boosting 15psi. the guage will sometimes vacuum on idle at 0vac, then if I turn it off and on it will idle at 18-20vac. but only boosts 15. If anyone could help that would be awesome .

    cheers

  2. #2
    Veteran Member Four Rings f4m0u5's Avatar
    Join Date
    Aug 04 2014
    AZ Member #
    270797
    Location
    gloucester

    do you have vag com? id run some logs/ xheck for codes. sounds like a boost leak at the gaugeif it gets to 0 vac sometimes while running

  3. #3
    Established Member Three Rings Teck09's Avatar
    Join Date
    May 11 2017
    AZ Member #
    399307
    Location
    WA

    Is this a new problem or something that just started happening? Take a log or two and compare that to your gauge. If they differ I would suspect the gauge/install but if they are reading the same I'd look for a leak as mentioned above.

  4. #4
    Active Member One Ring
    Join Date
    Aug 09 2018
    AZ Member #
    423973
    Location
    New Zealand

    Quote Originally Posted by Teck09 View Post
    Is this a new problem or something that just started happening? Take a log or two and compare that to your gauge. If they differ I would suspect the gauge/install but if they are reading the same I'd look for a leak as mentioned above.
    Hey, just made a diy leak tester for $30nzd goes well! put 20psi through and there is a rip in the right y pipe hose and a small leak in the guage hose. Will get these fixed and see then !

    cheers

  5. #5
    Established Member Three Rings Teck09's Avatar
    Join Date
    May 11 2017
    AZ Member #
    399307
    Location
    WA

    Quote Originally Posted by cwfao View Post
    Hey, just made a diy leak tester for $30nzd goes well! put 20psi through and there is a rip in the right y pipe hose and a small leak in the guage hose. Will get these fixed and see then !

    cheers
    Nice, sounds like you've found the issue. That will def do it.



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