Monster MotorsportAH Fabrications
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  1. #1
    Ardz83's Avatar
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    Not enough boost!!

    Hi guys
    I have put a boost gauge in my A4 and noticed im only boosting to 4psi max. I have checked for boost leaks and cant find anything. I unplugged the N75 valve and it actually seems faster.

    Any advice would be great as to what else this could be???

    Many thanks in advance
    Dan

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  3. #2
    Bradderz_1988's Avatar
    Dont replace it, Upgrade it !!

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    Is it a 1.8t? If so 4 psi is actuator pressure ie the n75 unplugged. What psi are you charging the system to when checking for boost leaks?
    1999 Audi A4 1.8T Quattro Sport - Volcano Black

    Mods - Frankenturbo F4 Kit - THS Decat - Milltek - ECS Crank Pulley - 034 Snub + Bracket/Gbox Mounts - 1Z/S2 Clutch + Flywheel - 007p - ICM + EVAP Delete - S4 B6 345mm Brakes - 300mm Rear Brakes - Goodridge Hoses - LCR Splitter -S4 Bumbers + Skirts/Mouldings - OEM Xenons - Apikol Diff mounts - Polytek'd Rear Diff Mount
    To do - F21 Upgrade - 3" Maf/Saab red Injectors
    WANTED : Cheap 02/52 Passat 1.8T AWT Manual

  4. #3
    Ardz83's Avatar
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    Yeah as said 4psi is all im getting with the N75 plugged in and unplugged so does that kinda say the N75 is knackered?

  5. #4
    Bradderz_1988's Avatar
    Dont replace it, Upgrade it !!

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    Yes I'd go with the n75 as it your first point of action as your symptoms are bang on for a faulty n75
    1999 Audi A4 1.8T Quattro Sport - Volcano Black

    Mods - Frankenturbo F4 Kit - THS Decat - Milltek - ECS Crank Pulley - 034 Snub + Bracket/Gbox Mounts - 1Z/S2 Clutch + Flywheel - 007p - ICM + EVAP Delete - S4 B6 345mm Brakes - 300mm Rear Brakes - Goodridge Hoses - LCR Splitter -S4 Bumbers + Skirts/Mouldings - OEM Xenons - Apikol Diff mounts - Polytek'd Rear Diff Mount
    To do - F21 Upgrade - 3" Maf/Saab red Injectors
    WANTED : Cheap 02/52 Passat 1.8T AWT Manual

  6. #5
    Ardz83's Avatar
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    Nice one pal. Which is the standard letter? is it C valve?

  7. #6
    Bradderz_1988's Avatar
    Dont replace it, Upgrade it !!

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    Think F is the standard there's one on eBay - 260840680580
    1999 Audi A4 1.8T Quattro Sport - Volcano Black

    Mods - Frankenturbo F4 Kit - THS Decat - Milltek - ECS Crank Pulley - 034 Snub + Bracket/Gbox Mounts - 1Z/S2 Clutch + Flywheel - 007p - ICM + EVAP Delete - S4 B6 345mm Brakes - 300mm Rear Brakes - Goodridge Hoses - LCR Splitter -S4 Bumbers + Skirts/Mouldings - OEM Xenons - Apikol Diff mounts - Polytek'd Rear Diff Mount
    To do - F21 Upgrade - 3" Maf/Saab red Injectors
    WANTED : Cheap 02/52 Passat 1.8T AWT Manual

  8. #7
    "Stick a V8 in it!"

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    Fault codes first!

    It might be intentional, certain faults will cause the ECU to cut boost.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  9. #8
    Ardz83's Avatar
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    I have not got a vag com thing.

  10. #9
    "Stick a V8 in it!"

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    Get one then, spending £10 on that is much more sensible than throwing money randomly at various parts that may or may not be faulty.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  11. #10
    Ardz83's Avatar
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    Replaced n75 and no joy still 4 psi!

  12. #11
    Bradderz_1988's Avatar
    Dont replace it, Upgrade it !!

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    You need to have it scanned before anything else or check where you've plumed your gauge in.
    1999 Audi A4 1.8T Quattro Sport - Volcano Black

    Mods - Frankenturbo F4 Kit - THS Decat - Milltek - ECS Crank Pulley - 034 Snub + Bracket/Gbox Mounts - 1Z/S2 Clutch + Flywheel - 007p - ICM + EVAP Delete - S4 B6 345mm Brakes - 300mm Rear Brakes - Goodridge Hoses - LCR Splitter -S4 Bumbers + Skirts/Mouldings - OEM Xenons - Apikol Diff mounts - Polytek'd Rear Diff Mount
    To do - F21 Upgrade - 3" Maf/Saab red Injectors
    WANTED : Cheap 02/52 Passat 1.8T AWT Manual

  13. #12
    Ardz83's Avatar
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    Could it be the wastegate stuck? It did look abit rusty down there.

  14. #13
    Bradderz_1988's Avatar
    Dont replace it, Upgrade it !!

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    I'd get it scanned before you even try the wastgegate as Aragon said previous certain faults will cause limp mode also get that pipework checked out as I was trying to chase what I thought was a boost leak on mine with no fault codes stored and even pressurised the system to find a small leak that only gave me 4psi at times from the vac line for the dv but sorted that and I saw 6psi after that (should off been 12-14psi and it was the wastegate plate it was just letting gases past it as it was wedge to the housing any way it landed it had worn that much I'm just surprised it lasted that long well it got 125k if it was the one from new.


    here's the little fecker -
    1999 Audi A4 1.8T Quattro Sport - Volcano Black

    Mods - Frankenturbo F4 Kit - THS Decat - Milltek - ECS Crank Pulley - 034 Snub + Bracket/Gbox Mounts - 1Z/S2 Clutch + Flywheel - 007p - ICM + EVAP Delete - S4 B6 345mm Brakes - 300mm Rear Brakes - Goodridge Hoses - LCR Splitter -S4 Bumbers + Skirts/Mouldings - OEM Xenons - Apikol Diff mounts - Polytek'd Rear Diff Mount
    To do - F21 Upgrade - 3" Maf/Saab red Injectors
    WANTED : Cheap 02/52 Passat 1.8T AWT Manual

  15. #14
    "Stick a V8 in it!"

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    Ardz: I've been telling you for weeks, you NEED to scan the car and find out whats actually wrong with it. Simply replacing random parts will get you nowhere and just waste your money.

    If your still driving around with the MAF unplugged, then you'll certainly not get any more than 4psi.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  16. #15
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    what is standard boost for an aeb?

  17. #16
    Bradderz_1988's Avatar
    Dont replace it, Upgrade it !!

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    6-7psi iirc
    1999 Audi A4 1.8T Quattro Sport - Volcano Black

    Mods - Frankenturbo F4 Kit - THS Decat - Milltek - ECS Crank Pulley - 034 Snub + Bracket/Gbox Mounts - 1Z/S2 Clutch + Flywheel - 007p - ICM + EVAP Delete - S4 B6 345mm Brakes - 300mm Rear Brakes - Goodridge Hoses - LCR Splitter -S4 Bumbers + Skirts/Mouldings - OEM Xenons - Apikol Diff mounts - Polytek'd Rear Diff Mount
    To do - F21 Upgrade - 3" Maf/Saab red Injectors
    WANTED : Cheap 02/52 Passat 1.8T AWT Manual

 

 

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