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Old 08-02-2007, 07:09 AM
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Default what are the signs of a blown turbo?

so lately i have had some boost issues sometimes i get full 18psi and other time i only get 5psi, i was starting to hope that the turbo was fine and the turbo to manfold gasket had blown out or started to leak but to night on my way to work im on the highway in fouth gear and i get on it to pass someone and i hear a boom and then no boost so i coast then i try to get some boost out of it and my gauge will hit 5 then it surges then nothing. Can it be that maybe my map sensor has quit? i don't have a check engine light (yet) and my vag is at home which i will scan when i get home today to see if any codes have shown up, is there any other reason that this could happen? or is my turbo toast?
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01 Audi A4 Quattro, Franken Turbo, Motaza Tuned, Abd intake, Bilsten sports, H&R springs, Neuspeed front, rear sway bars and exhaust, Atp test pipe, JHM linkage, complete rs4 body kit, 18" Falkens, Nitto invo tires, Forge 007 DV and Unos Mbc, 034 street motor & trans mounts.
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Old 08-02-2007, 09:41 AM
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Default RE: what are the signs of a blown turbo?

if your turbo going bad you would hear grinding sound something like huge hummer drill. having leak like u have if your gasket blown out most likely you would see and hear the leak while inspecting it, even then don’t think you would loose all the pressure… first I would check for any leaks, not just inspecting vacuum hose, but check for leaks using compressor.
once again sound of dying turbo will scare the hell out of u.
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Old 08-02-2007, 09:52 AM
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Default RE: what are the signs of a blown turbo?

it will hit 5psi then it kinda feels like the rev limter kicks it. im running a vag on it right now. it has not made any fun denist drill noises
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01 Audi A4 Quattro, Franken Turbo, Motaza Tuned, Abd intake, Bilsten sports, H&R springs, Neuspeed front, rear sway bars and exhaust, Atp test pipe, JHM linkage, complete rs4 body kit, 18" Falkens, Nitto invo tires, Forge 007 DV and Unos Mbc, 034 street motor & trans mounts.
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Old 08-02-2007, 09:53 AM
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Default RE: what are the signs of a blown turbo?

p1555 charge pressure max limit exceeded

sounds like it went in to limp mode
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01 Audi A4 Quattro, Franken Turbo, Motaza Tuned, Abd intake, Bilsten sports, H&R springs, Neuspeed front, rear sway bars and exhaust, Atp test pipe, JHM linkage, complete rs4 body kit, 18" Falkens, Nitto invo tires, Forge 007 DV and Unos Mbc, 034 street motor & trans mounts.
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  #5  
Old 08-02-2007, 09:59 AM
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Default RE: what are the signs of a blown turbo?

that could be your problem, have u tried diode mode? mean if your turbo is fine and you have no vacuum leaks , try cleaning maf sensor and do diode mode... it should keep you out of limp mode
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Old 08-02-2007, 10:03 AM
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Default RE: what are the signs of a blown turbo?

what is diode mode

and how do i get it out of limp mode?
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01 Audi A4 Quattro, Franken Turbo, Motaza Tuned, Abd intake, Bilsten sports, H&R springs, Neuspeed front, rear sway bars and exhaust, Atp test pipe, JHM linkage, complete rs4 body kit, 18" Falkens, Nitto invo tires, Forge 007 DV and Unos Mbc, 034 street motor & trans mounts.
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Old 08-02-2007, 10:07 AM
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Default RE: what are the signs of a blown turbo?

oh and i have a manual boost controller (forge 3 prong) which i had moved last week is there a change that i but it in backwards? bottom prong goesto nothing leftgoes to waste gate and right goes to n75 valve. i would spike at 22psi hold at 18-15psi
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01 Audi A4 Quattro, Franken Turbo, Motaza Tuned, Abd intake, Bilsten sports, H&R springs, Neuspeed front, rear sway bars and exhaust, Atp test pipe, JHM linkage, complete rs4 body kit, 18" Falkens, Nitto invo tires, Forge 007 DV and Unos Mbc, 034 street motor & trans mounts.
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  #8  
Old 08-02-2007, 10:07 AM
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Default RE: what are the signs of a blown turbo?

to get it out of limp mode you have to clear the codes and to keep it out of limp see here.
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  #9  
Old 08-02-2007, 10:09 AM
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Default RE: what are the signs of a blown turbo?

but I would still check for blown gasket and for any leaks … do the simple stuff first…
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Old 08-02-2007, 10:13 AM
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Default RE: what are the signs of a blown turbo?

after the engine cools im going to check around the turbo and manifold for any leaks

and my car looks just like yours minis the bagesand taillights, mine is black with black 18" falkens
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01 Audi A4 Quattro, Franken Turbo, Motaza Tuned, Abd intake, Bilsten sports, H&R springs, Neuspeed front, rear sway bars and exhaust, Atp test pipe, JHM linkage, complete rs4 body kit, 18" Falkens, Nitto invo tires, Forge 007 DV and Unos Mbc, 034 street motor & trans mounts.
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