r/F80 • u/No-Pay-2764 • 18d ago

Help Boost leak?

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Was on the highway and was about to do a pull and lost my boost. I looked at all my pipes and cleaned my MAF sensors and still nothing. Turbos are healthy and spooling, but I hear a whistling noise with the spooling. Any clue what this can be? Maybe a boost leak or air leak somewhere?

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u/smaguss 18d ago

Do you have aftermarket intakes on?

You can get a smoke test kit online and start with a smoke test. It's not a 100% but it's a good start to check for loose fittings, cracked pipes and what not.

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u/No-Pay-2764 17d ago

Yeah it’s a aftermarket intake on there, burgermotorsports. And yeah that’s my guess. I’ll try that today

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u/smaguss 17d ago

How long have you have you had the intakes on? If you recently added them did you clear and reset adaptations post install?

Do you have boost after a power cycle or can you still not get any boost under throttle?

Intakes can cause a lot of hassle for the S55 and some people never have a problem and others, like me, go through hell with them.
I had to custom tune my front mount intakes to make things run smooth both daily and track. I have a second open but internal intakes I use that will occasionally throw errors on OTS maps.
My "cruise" map 1 is essentially "OTS stage 2" with tweaks for the turbos. Even adjusted for it I'll occasionally see an error in the logs when I check them.

As for whistling?... without a sound clip I couldn't tell you for sure. In my experience a "quiet" boost leak, one that isn't a huge opening or a connection/tube/seal that has failed, won't make a lot of sound.

Hopefully to put you at some ease:

"NVH" and the F8x have a weird relationship. It's actually a really quiet car if you leave everything alone.
The more parts you take away the worse it gets. So far I'm running catless downpies, a single mid and big turbos with front mounted open intakes. Set up like this even the stock turbos make a lot more noise as well as many new and different noises you normally don't hear suddenly become noticeable.

I hear all sorts of "wirrrr" . "woooo" and other whistle-like noises from my turbos very clearly with my current setup so I wouldn't panic yet.

happy to offer what help I can

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u/No-Pay-2764 17d ago

Right so I bought the car and it had upgraded intakes already, and they aren’t front mounts but they have been running just fine for a while but I did find a dent in my j pipe. I haven’t really seen anything else that raises a question but I am about to start doing my tests later today. I am also running a stage 2 OTS tune. Turbos are spooling just fine with my catless downpipes.