Loose Pipe

[MT01631]

OK, had a rattle from the engine bay for a while and looks like it was the air filter housing, all the scews that held it in place were missing, whilst about there noticed this hose not connected, can anyone tell me where it should go to and probs from not having it plugged in (if it should be), I put the tape on the end just in case.

Thanks

Mark

[Martynf]

Where exactly do the other two hoses go to? looks like you have a T piece there, so where do the other two hoses go to? I'll have a look on mine a little later for you.

[MT01631]

Thanks, hose running right from the taped piece goes into the side of the engine block, I think, cant really see and old uncle audi didn't exactly leave much room for getting my muckle paw in!!

You can see where the other runs to in the picture, he says not knowing if its the turbo or wastgate

Mark

[Greg_S]

from looks of it may have had a T Piece fitted for a boost gauge.

but the pipe coming for the wastegate should connect into your WGFV.

the WGFV has 3 connections. one into the accorion hose one with positive boost to it and the 3rd goes to the wastegate.

the WGFV is the ECU's way for controlling the overboost.

Greg

[MT01631]

Any reason why it should be disconnected from wastegate, the piece with the tape on it had been folded over and sealed with a cable tie.

I'll reconnect it and see if there is any difference, should I see any?

Thanks

Mark

[MT01631]

nuts :confused: right connected the vac hose that was taped up to the WGFV valve, the other one runs off from the t piece to the intake manifold.

Car runs fine but when the boost comes in the car judders like hell and wont play ball, dont get me wrong the car ran great before but just wondering if it would run better if connected up properly.

[Dr H]

I don't have any pipe coming off the Waste Gate

See pic below from when I replaced the turbo. Should there be a pipe?

Leigh

[Mark Halligan]

Leigh,

No, there should be no pipe attached to the top of the wastegate it is left open to atmosphere, I know it looks wrong but it's not.

Cheers, Mark.

[s2avant]

The S2 doesn't use the connection at the top of the wastegate as far as I remember. I know for sure ABY's don't and I think it's the same for 3Bs. That connection is a throw back to the old turbo engines.

Ben

Guess you submitted just before me Mark

[Dr H]

Cheers Mark

One less thing to worry about now I have to work out if my wastegate sprimg has been set back to a proper setting (after having a superchip fitted and removed by the last owner).

I'm wondering if that is why is see very short periods (1 sec) of boost up to 1.5 bar on a standard ABY

Leigh

[S2central.net]

Someone has been tampering with that wastegate

The vent cap on top of the WG should be open to atmosphere. There are some earlier UR variants which I *think* connected boost pressure to the wastegate cap in an effort to keep it closed longer but this is NOT the way of things on an S2.

Disconnect that tube on the WG cap and all attached tubing.

Mark's right - it looks wrong having the cap connected to nothing but it absolutely IS correct for an S2.


Paul

[MT01631]

Shall remove the pipe from the wastegate tomorrow but what about the rest of the pipe and what it was connected to?

[Mark Halligan]

Mark,

That small bore fabric covered vacuum hose ( there is only one on that side of the engine) should go to the bypass valve or dump valve, whatever you wish to call it. However looking at your photo it seems that some bright spark has disconnected it and in a fit of 'creative engineering' done god knows what to it, (I might be wrong) .
The hose 'should' connect to the BPV/DV, and to that only, this is just behind the headlight and is connected to the large hose in your photo. By the way it is important that this valve operates correctly as this recirculates boost pressure when lifting off of the throttle i.e. gear changes, and stops the compressor stalling.

Best regards, Mark.

[MT01631]

Thanks Mark, please check my photo at top of thread, can you confirm the text boxes I've added in are what you are referring to.

Scuse the ignorance!

Mark

[Mark Halligan]

Yep,
thats right, although it would probably be better to replace the whole hose for a new length, 4mm internal diameter, however thats assuming that I am right about your DV being disconnected.

Looking at you airbox I think you have an ABY?

If so, the hose connects to a piece of pipe at the front of the engine that goes behind the timing belt and connects via another short length of the same hose to the inlet manifold.

Mark.