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Thread: NO BOOST??

  1. #1
    Established Member Two Rings
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    NO BOOST??

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    I finally finished building my car, and now when you accelerate has very little boost mayeb 5si. The EGR is not working since the AEB head doesnt have the hole for it, but every vaccum line is connected to the TIP even the one from the EGR.
    Boost leak? where to find?
    bad turbo?
    oohhh and also you can not shift the clutch is new 1000miles on it. and feels like the pressure plate is not releasing the clutch.
    PLEAAAAASEE HELP!

  2. #2
    Veteran Member Four Rings old guy's Avatar
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    Re: NO BOOST??

    Not sure what you are referring to as an EGR. The 1.8T doesn't have an EGR system. Are you referring to the SAI port on the back of the head or the crankcase pressure regulating valve coming off the valve cover? As to the clutch, I experienced the same issue. I got around it by extending the slave cylinder rod by .250". As the clutch wore in I continually reduced the length to where after 15K miles it is back to the original stock length. Here is a DIY (Thanks Martini!!!) to show you how: Clicky click
    '03 A4 5-MT Motoza tuned Frankenturbo F21L With full supporting mods. Sold (and missed dearly).
    '13 A5 6-MT Needs more Fun Stuff: Neuspeed PM / 3.0 TDI Intercooler / H&R OE Sport Springs / Bilstein B8 Shocks / TyrolSport Brake Stiffeners / ECS Short Shifter / S5 Side Skirts / RS Grille

  3. #3
    Established Member Two Rings
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    Re: NO BOOST??

    Well as seen in the diagram here: http://www.audizine.com/forum/showthread.php?t=235116 Its the combi or EGR valve (as i understand in the posted thread) that is part of the SAI. That in the AEB head is blocked, no hole, so i just screwed it there and connected a line to the TIP.
    I think i will remove all of that and as i read on the posted thread, take everything, run the hose trhough crank to head with T and catch can. Leave all selenoids plugged in and then give it a try.

  4. #4
    Veteran Member Four Rings old guy's Avatar
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    Re: NO BOOST??

    Quote Originally Posted by msr1 View Post
    Well as seen in the diagram here: http://www.audizine.com/forum/showthread.php?t=235116 Its the combi or EGR valve (as i understand in the posted thread) that is part of the SAI. That in the AEB head is blocked, no hole, so i just screwed it there and connected a line to the TIP.
    I think i will remove all of that and as i read on the posted thread, take everything, run the hose trhough crank to head with T and catch can. Leave all selenoids plugged in and then give it a try.
    OK I know what you are talking about. That is the SAI (air injection) port used to add additional O2 to the exhaust prior to the cat on cold starts. It's not an EGR (exhaust gas recirculation) valve. I am not sure I understand what you mean by "I just screwed it there and connected a line to the TIP". What line? Did you connect the line from the SAI pump to the TIP? If so you will want to remove that connection to the TIP. If you aren't using the SAI port there is no need for any of the SAI system.

    Also, are you still running the N75? If so, check the connector and make sure it is plugged in all the way.
    '03 A4 5-MT Motoza tuned Frankenturbo F21L With full supporting mods. Sold (and missed dearly).
    '13 A5 6-MT Needs more Fun Stuff: Neuspeed PM / 3.0 TDI Intercooler / H&R OE Sport Springs / Bilstein B8 Shocks / TyrolSport Brake Stiffeners / ECS Short Shifter / S5 Side Skirts / RS Grille

  5. #5
    Established Member Two Rings
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    Re: NO BOOST??

    Me english sucks so im trying to be the most clear i can. I will remove it from the TIP. but thatts not cuasing the problem of boost i think, my n75 valve is connected and works fine. dont know where tje huge leak of boost went, i shopuld be boosting 20psi.

  6. #6
    Veteran Member Four Rings old guy's Avatar
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    Re: NO BOOST??

    For starters you could run a boost leak test to make sure there are no loose hoses anywhere. You mentioned that you just finished building your car. What set up are you running? Different turbo? What software?
    '03 A4 5-MT Motoza tuned Frankenturbo F21L With full supporting mods. Sold (and missed dearly).
    '13 A5 6-MT Needs more Fun Stuff: Neuspeed PM / 3.0 TDI Intercooler / H&R OE Sport Springs / Bilstein B8 Shocks / TyrolSport Brake Stiffeners / ECS Short Shifter / S5 Side Skirts / RS Grille

  7. #7
    Established Member Two Rings
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    Re: NO BOOST??

    installed awe kit gt28r, 440cc, GIAC the oil pump stucked and the head was damaged, then bought a new AEB head, and AMU block w/scat rods and mahle pistons. built it all up again and now im having this problems.. daaamn my car has never ranned good

  8. #8
    Veteran Member Four Rings old guy's Avatar
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    Re: NO BOOST??

    As previously mentioned you could run a boost leak test to check for any loose hoses. Also you may want to take another look at your N75 to make sure it is working. If it doesn't open and relieve the pressure to the waste gate activator you will not be able to build much boost at all. You should also check to see if you have any significant codes that may need clearing.

    Good luck!
    Last edited by old guy; 01-20-2009 at 07:22 PM.
    '03 A4 5-MT Motoza tuned Frankenturbo F21L With full supporting mods. Sold (and missed dearly).
    '13 A5 6-MT Needs more Fun Stuff: Neuspeed PM / 3.0 TDI Intercooler / H&R OE Sport Springs / Bilstein B8 Shocks / TyrolSport Brake Stiffeners / ECS Short Shifter / S5 Side Skirts / RS Grille

  9. #9
    Established Member Two Rings
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    Re: NO BOOST??

    I removed almost all the vaccum lines and check valves, tyhe car now has 20 psi but has trouble going farther than 6k feels like it has no power at high rpms, and is real slow even at 20psi, dont know what that could be.. ive checked timing and looks fine.. maybe error codes could do this?

  10. #10
    Veteran Member Four Rings old guy's Avatar
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    Re: NO BOOST??

    Sometimes error codes have to be cleared to get out of limp mode. That doesn't sound like the issue now since you can build boost. I am assuming you have the correct software (AWE flash) for your car?
    '03 A4 5-MT Motoza tuned Frankenturbo F21L With full supporting mods. Sold (and missed dearly).
    '13 A5 6-MT Needs more Fun Stuff: Neuspeed PM / 3.0 TDI Intercooler / H&R OE Sport Springs / Bilstein B8 Shocks / TyrolSport Brake Stiffeners / ECS Short Shifter / S5 Side Skirts / RS Grille

  11. #11
    Established Member Two Rings
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    Re: NO BOOST??

    Yes i do my friend, but since the first day i installed the kit the car has had problems to rev more than 5.8k it feels like the engine is out of power on that range, previously the car only ran good for 2-3miles and it felt slow (but way faster than now).
    Im facing a real hard time with this car, has never ran good, firts the oil pump problem, now a new engine and more problems.. i will like to think as you said the car has error codes that is making it go in some weird kind of limp mode even though it holds the 20psi (and feels like stock/no bs), and its not letting it ran as it should... but as well 1 teeth in retard in the timing belt could also do this... ... what Ive been told.
    I am waiting right now for a new slave cylinder since my mechanic had the marvelous idea of checking the pressure of it outside the tranny and broked the 4 clips that go inside.

  12. #12
    Established Member Two Rings
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    Re: NO BOOST??

    oohhh and other thing that i noticed as well on my car, was that when i tested it for maybe 500mts when i got back the intercooler was as hot as the engine.. and that is really weird

  13. #13
    Veteran Member Four Rings old guy's Avatar
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    Re: NO BOOST??

    Are you running the catalytic converter that comes with the AWE kit? Is the cat getting really hot as in glowing red? It sounds like you may have a restriction somewhere.

    Edit: And the more I think about it having the timing belt off one tooth could very well be part of your problem. Definately want to check that out ASAP. It could explain how you are getting plenty of boost but not making any power.

    Good luck!
    Last edited by old guy; 01-23-2009 at 05:21 AM.
    '03 A4 5-MT Motoza tuned Frankenturbo F21L With full supporting mods. Sold (and missed dearly).
    '13 A5 6-MT Needs more Fun Stuff: Neuspeed PM / 3.0 TDI Intercooler / H&R OE Sport Springs / Bilstein B8 Shocks / TyrolSport Brake Stiffeners / ECS Short Shifter / S5 Side Skirts / RS Grille

  14. #14
    Established Member Two Rings
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    Re: NO BOOST??

    I am using the high flow cat, today i will check the timing and will let you know whats with it.

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