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Audi A4 The Audi A4 model offers nimble handling and performance that makes it one of the leading cars in its class. Read more about the Audi A4 in the Audi A4 review.



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  #1  
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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  #2  
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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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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  #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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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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  #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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Old 08-02-2007, 10:34 AM
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Default RE: what are the signs of a blown turbo?

so far it is back to normal im sooo glad it was just limp dick mode but im still going to check for leaks just to be on the safe side
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Old 08-02-2007, 12:55 PM
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Default RE: what are the signs of a blown turbo?

blown turbo=1000 screaming banchies
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Originally Posted by auditech79 View Post
Yeah you are a boost *****.
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Old 08-02-2007, 01:03 PM
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Default RE: what are the signs of a blown turbo?

I have the same car as you and i tried running a MBC but it kept going into limp. same symptoms as you and I just took the MBC out and put my race valve back in. are you sure your MBC is calibrated the right way?
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Old 08-02-2007, 01:06 PM
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Default RE: what are the signs of a blown turbo?

its because you where over boosting and the car went into limp mode. what did you have yoru psi set to?
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Yeah you are a boost *****.
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  #15  
Old 08-02-2007, 01:39 PM
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Default RE: what are the signs of a blown turbo?

Sounds like over boosting, might have turned the dial one half turn to many lol
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Old 08-02-2007, 03:29 PM
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Default RE: what are the signs of a blown turbo?

blown turbo = cloud of white smoke out the exhaust pipe.
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  #17  
Old 08-02-2007, 05:23 PM
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Default RE: what are the signs of a blown turbo?

Our turbos are coolant cooled?
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  #18  
Old 08-03-2007, 01:30 AM
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Default RE: what are the signs of a blown turbo?

i have a forge 3 prong mbc which i have never turned to dial up or down from the day i got the car with it on it i just moved where it was located last week i did like where it was but i was having boost issues before i moved it. it was set at 18psi which is what my car wants and sometime it would spike at 22psi then drop to 18psi right away. i check around the turbo and exhaust manifold to see if i could feel any leaks and didn't feel any. on my drive to work tonight i could hit 18psi but it is not smooth as it was before i had these issues so i think im going to order a forge unos mbc since right now i have one of the cheaper 3 prong forge valves, so maybe it will smooth it out alittle bit.
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Old 08-03-2007, 01:38 AM
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Default RE: what are the signs of a blown turbo?

Ball and spring mbc and stock turbos are not a great combo.
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  #20  
Old 08-03-2007, 01:42 AM
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Default RE: what are the signs of a blown turbo?

Quote:
Ball and spring mbc and stock turbos are not a great combo
i have this on right now http://www.forgemotorsport.com/conte...oduct=FMICB051

and i just ordered this one http://www.forgemotorsport.com/conte...product=FMUNOS

so which one is better with the stock turbo??
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