![]() ![]() The N275 valve is a bit of a pain, and should be removed or bypassed on a tuned car. You can fit a new N75 and things won’t be right because it has adapted to the characteristic of the old N75! To complicate things, ME7 adapts it’s boost control to compensate for things like wear. They can work at one moment, and then not the next. ![]() If yours is a few years old, or you are having a remap or any change of tune then I strongly suggest you fit a new one, they aren’t expensive. The N75 valves used to control boost aren’t the best, they wear, stick and fail, and often won’t give any fault codes. This can be both hardware and software based. The problems being described seem to be in two different issues – Surging and holding back, which are slightly different to each other.įirstly, surging is where the car is pulling hard but the boost isn’t holding steady. In my spare time i build and map engines on different ECU’s including motronic. I am an instrumentation engineer for large company, have a degree in Physics and in Electronic & Electrical engineering. I stumbled on this topic through Google and thought I would add my input. ![]()
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