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ko4 upgrade now no boost???

Discussion in 'A3/S3/Sportback (8P Chassis)' started by s3 ginga, Dec 8, 2008.

  1. s3 ginga
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    s3 ginga New Member

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    [Dec 8, 2008]
    i have fitted the ko4 turbo but have not yet had the s3 intercooler fitted running it with the standerd intercooler plus standerd injectors i had ccm come out and remap the car but the car is is not boosting i can heer the waste gate going off but still very little boost what should i do next??
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  3. Boydie
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    Boydie Guest

    [Dec 8, 2008]
    Is your car an 8L or an 8P S3??
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  4. KRL
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    KRL Member

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    [Dec 8, 2008]
    I am assuming you have an 8P A3 2.0t and have upgraded it to a K04 turbo?

    If the above is true the first place I would be looking if your car is not boosting is the diverter valve.
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  5. s3 ginga
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    s3 ginga New Member

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    [Dec 8, 2008]
    yes mine is the 8p 2.0t i have checked the diverter valva all pipe work is tight no rips in the rubber but how would i be able to check if it is working as i do not have vag com?
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  6. hatmeow
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    hatmeow Turbo is the only way....

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    [Dec 8, 2008]
    What map are you running?
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  7. VRStu
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    VRStu Just Looking VCDS Map User

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    [Dec 8, 2008]
    Without wishing to be rude, embraking on these kind of projects is more than a little risky without a diagnostic tool of some description.

    You will need to have a look at a few things which you really are going to need VAG-COM or similar for.

    Perhaps update your profile with location and see if you can't find somone local to you with the tool.
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  8. KRL
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    KRL Member

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    [Dec 8, 2008]
    I think you would need to remove the diverter valve and have a good look at it.

    If the diaphragm has split it leads to a reduction in turbo boost pressure.
    The diaphragm / piston sometimes break away from the solenoid shaft itself. This renders the valve inoperable.

    As Stu has already wisely said, you really need to have access to VAG-COM when doing this kind of stuff.
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  9. s3 ginga
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    s3 ginga New Member

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    [Dec 9, 2008]
    il take the diverter valve apart again if i remember im sure the rubber does come apart from the shaft there is a spring inside il look into getting vag com
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  10. s3 ginga
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    s3 ginga New Member

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    [Dec 12, 2008]
    just a little update on symptoms.
    i have checked the dv that is fine no rips in the rubber i have driven the car again and to me this is what happens. if i put my foot down in 1st gear it will boost up change into second it will kick in but not much then will completely die off through 3rd 4th 5th and 6th. i have also noticed if i wind the car up slow it will boost better in 2nd gear then i will take my foot off the pedal and the car will jolt forward then the revs will drop could it just need a custom remap on a rolling road or do i hae to fit the s3 injectors and so on will this sort the problem???
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  11. NHN
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    NHN Retrofitter - Audi - VW - Skoda - Seat Site Sponsor VCDS Map User

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    [Dec 12, 2008]
    Are you sure it doesnt have any leaks anywhere cause if you whack it down & it dies then you do progressively it seems to be ok initially maybe split pipe which opens up only on the higher pressures, thinking aloud here of course as to me its not an impossible thing to happen, shouldnt need injectors changing or custom map until you know for sure whats causing these issues 1st, get vagcom on it & see whats it throwing or diagnostics, Stu is fairly wise on vagcom, I'm sure he'll be able to advise more (hope he doesnt mind me saying anyway)
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  12. s3 ginga
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    s3 ginga New Member

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    [Dec 12, 2008]
    im gonna go tommorow to get the car on a vagcom place was closed today. is there any kit i could buy to check for leaks? and how would i go about checking for leaks??? any help would be great cheers...
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  13. RobinA3
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    RobinA3 Well-Known Member

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    [Dec 12, 2008]
    when you say you had someone come out to remap the car did they not notice that it wasn't boosting?

    you need to get vagcom hooked up and monitor the wategate duty cycle and see if the engine management is opening the wastegate to dump the boost as its not liking something its not seeing.

    When you say you have fitted a new turbo who did it for you? or did you do it yourself?
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  14. VRStu
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    VRStu Just Looking VCDS Map User

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    [Dec 13, 2008]
    As above, the first thing you want to be looking at is the wastegate duty cycle and this will give you an indication of how much boost is being produced.
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  15. s3 ginga
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    s3 ginga New Member

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    [Dec 13, 2008]
    il have to find someone with vag com in birmingham and get it hooked up:banghead:
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  16. VRStu
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    VRStu Just Looking VCDS Map User

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    [Dec 13, 2008]
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