[Biturbos4] 0-280-142-116 (and turbo loss)

[j y]

if you are not chipped - they should be ok.
 
If chipped - I would replace them with Bosch 710N DVs (the ones from the Audi TT). That's what most S4 guys are doing - the 710Ns actually hold more boost than the standard S4 DVs - don't ask me why - they just do. Some S4 guys are using the Forge and Hyberboost DVs. I've used both 710Ns and Hyberboost DVs. They are about the same in ability to handle boost - but the BOSCH 710Ns are significantly cheaper (roughly $40 each) to purchase - Forge or Hyberboost are usually $150 each. 
 
If you are getting NO boost - I still think that you are in "limp mode". You don't have to get a CEL to be in "limp mode". If you have a boost gauge - u can definitely tell if your are in limp mode. If you have ANY tears in your vacuum hoses or TBB - my opinion - u definitely have a BOOST LEAK - which leads to "limp mode". "Limp mode" is one of the fail safes that's built into the S4 ECU to protect your turbos from overspin and basically blowing up.
  

Grant <gfl1 at optonline.net> wrote:
Thanks,

Yes I have a VAG-COM, and as to avoiding WOT, I am basically not 
driving the car ( I fortunately have another). BTW, it does not appear 
to be in limp mode - I certainly dont feel any boost at all, and I have 
no check engine light. Have nto pulled odes, but doubt I'll find any. 
Any advice on the main question - do they require service once they're 
out?

Grant
On May 21, 2005, at 2:50 AM, j y wrote:

> Yeah - sounds like you are describing the DVs (u call them by-pass 
> vlaves - same thing). You are probably operating in "limp mode" 
> because you have a BOOST leak (the loose/torn vacuum hose). Whenever 
> your S4 has a boost leak the ECU automatically puts the car into "limp 
> mode" (reduced boost - no more than 5-7 psi). If you have a boost 
> gauge and your PSI doesn't go beyond 7 psi - u r in "limp mode". I 
> would NOT recommend going WOT until u repair the torn hoses. Good 
> thing that you are not chipped - it would only put strain on that 
> boost leak. If you don't have VAG-COM - go and purchase it from 
> ROSS-TECH. VAG-COm would DEFEINITELY tell you if had a boost leak (and 
> most other internal problems). VAG-COM is the best purchase an S4 
> owner can make (especially if chipped).
>
> Grant wrote:Hi all,
>>
>> I recently lost boost in my 2000 S4. Stock, mostly. I remain
>> optimistic that my turbos are healthy since I don't beat on it, use
>> Mobil1, and cool it down religiously. Also heard no singing, and the
>> car ran almost OK even without boost. Just lethargic.
>>
>> I began investigating, suspicious of the TBB, when I found (wish I
>> could post a pic, but I cant - if you want to see, I can send them
>> direct) that the 1/4 vacuum hose between a mysterious black cylinder
>> and another was frayed and torn. A bit more digging revealed that it
>> has also pulled out of its hose (loose clamp I guess?) which connects,
>> with ~1" hoses, from just pre the TB to the intake to the turbos (the
>> pipes leading down from the air intake). Each is marked BOSCH
>> 0-280-142-116. Topologically, they could be bypass valves. Are they?
>>
>> Now, this could just be a loose clamp and if I put it all back 
>> together
>> with new hoses, all might be well. But while its apart, what's the
>> advice on testing or replacing these devils?
>>
>> Any and all educated advice welcome!
>>
>> Thanks much in advance,
>>
>> Grant
>>
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