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Does anyone have some diagrams showing where all the vacuum/pressure hoses go to. My engine was removed for me without anyone noting where all these small bores hoses go to , so as much info as possible would help get me out this balls up?! Thanks.
1986 Coupe q - 2281cc 3B, chargecooler, 2.75" exh & downpipe, ported head, water injection, CGR box, modified MD357 turbo, 440cc injectors, high power coil.
2004 A4 2.5TDi convertible, re-mapped to 180bhp
2011 A5 sportback 3TDi-Backbox delete, remap
Normaly... all off them are going behind the intake manifold were are 3 small outputs and 1 bigger.
In the 3 small ones are the ECU boost hose, fuel pressure regulator and through 1 way valve the clima control. Normaly at old 3B engines, the vacuum/boost for the bypass valve comes also from 1 off those small tubes through an T connection. The new 3B engines from S2 have that conection in front off the intake manifold.
Hope this helps!
All the best!
Eugen
Oh but those digs are old - there is a vacuum reservoir at the front of the S2 on aircon equipped cars which I omitted to show. Its T'd into the same line that goes to the recirc valve.
There is no sticker as this is a series 2 Cq it is going in and the base car has long gone to the crusher. The attached is one of the mystery hoses, not sure where it fits in relation to Paul's diagram?! There are also three hoses to the N75 valve where do these all go? Thanks
N75 is easy... But a photo simplifies things - I can describe the ABY setup from memory, but the N75 on 3B is slightly different with regards connector location / orientation.
Let me think. There are three connections on N75 - lets call them Boost, Vacuum & Wastegate.
I'm pretty sure that the bottom hose on N75 connects to the boost line on the compressor side of turbo. When N75 is OFF, you can blow air thru that turbo hose to the wastegate connection.
The last connection on N75 goes to the MAF hose where it always sees vacuum... When you put 12V onto N75 you make a connection from vacuum to wastegate.
Its the N75 duty cycle that jiggles the presentation of boost and vacuum to the wastegate so as to control boost pressure.
I'll try and annotate your photo against my 3B vacuum tree later on - its not as hard as it looks (said the actress to the bishop).
Something just occured to me, I do not remember picking up or seeing any reservoirs in the box of bits. What should it/ they look like. I do not have aircon so this should simplyfy things I hope?!
1986 Coupe q - 2281cc 3B, chargecooler, 2.75" exh & downpipe, ported head, water injection, CGR box, modified MD357 turbo, 440cc injectors, high power coil.
2004 A4 2.5TDi convertible, re-mapped to 180bhp
2011 A5 sportback 3TDi-Backbox delete, remap
In which case you can ignore that check valve and its connection to the recirc valve and front reservoir. BUT you must keep the check valve and rear vac reservoir which is used for rear diff-lock actuation. You cannot present boost pressure to that system.
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, so as much info as possible would help get me out this balls up?! Thanks.
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