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Only through N75.
ECU modulates N75, reducing pressure applied to the bottom chamber of the wastegate.
In limp mode the N75 is left open to the wastegate which will open at spring pressure.
If you were to disconnect the hose from the WG (and plug it). The WG would stay closed and the car would overboost till the fuel is cut.
Have you checked that your ECU is seeing boost pressure? It’s been known for the boost/vac line from the inlet manifold to leak or be disconnected at the moisture trap under the carpet on the uk passenger side.
The small cotton covered vac lines at the back of the inlet manifold are usually leaky if still original.
I did some maf testing today following UrS4boy’s helpful guide. All the numbers are good and everything seems ok. I cleaned the connectors again for good measure.
I also replaced the last bits of old vac pipe left. These were the short lengths next to the ecu.
I will do another boost leak test again tomorrow.
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Nothelle S2 Avant
Black Ur project
Ocianic Ur project gone
S2 Coupe project gone
Urs6 plus project gone
Took the S2 for a little spin to visit Newsh today.
We did some tests (two heads is better than one) and after a bit of head scratching and a small sprinkle of Newsh fairy dust, I think we are on to it. It looks like my nice new Bosch fuel pump might be a fake.
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Nothelle S2 Avant
Black Ur project
Ocianic Ur project gone
S2 Coupe project gone
Urs6 plus project gone
My (long!) process of elimination included power and continuity checks to N75 and MFTS (connected or disconnected), Swapped N75 and ECU (to an N300 vice MTM) put standard spring back in wastegate and vacuum checked for leaks, temporary replaced N75 with a turbosmart boost control (eventually ending up with it wound all the way out), removed air con belt. Car has full set of Roose boost hoses and a rebuilt turbo (last year). Throughout all of this it resolutely won’t go above 0.7 bar of boost in any combination.
Wastegate sticking
Panthero Coupé quattro 20vt
Indigo ABY coupé
Imola B6 S4 Avant
Thanks to Cardcrash I now have a RS2 pump and basket.
I drained the tank completely and some yuk came out.
The RS2 basket is almost identical to the S2. Just different neck.
Everything was given a good clean and put back together.
And, best of all
Boost is back! Hurray
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Nothelle S2 Avant
Black Ur project
Ocianic Ur project gone
S2 Coupe project gone
Urs6 plus project gone
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