Hey guys. I'm new to the S2K world and to this forum. I know there is already a thread on this subject but it's from Europe and really not 100% on point for my situation. I have a 2008 S2K with very low miles. It has the SoS Paxton Novi 1200 Supercharger Kiton it, but installed in a modified manner with a Kraftwerks air-to-air intercooler, 3" Griptech pulley and some other stuff (photo below). The bypass valve (installed under the intake pipe) has a very loud chirping sound (others refer to it as flutter but to me it really sounds like chirping). It is seriously loud, especially with my no-insulation carbon fiber hood, and always present unless the engine is accelerating. It is loudest at decel (the higher the revs and more decel, the louder it is) and still noisy at a constant speed. Someone told me you can buy quieter bypass valves. It anyone aware of that and any brands that are quieter? I spoke to the guys at SOS, but they weren't any help. Apparently theirs is real quiet with the stock install, but with this modified install, they couldn't offer any ideas. Happy to share any other info that might help.


and some other stuff.

 

Can't really tell from the picture but it looks like it's setup to recirculate back to the intake pipe?
I'm also guessing it is the stock plastic valve which really is way to small if you run a 3" pulley.
I would replace it for a Forge supersize just like Kyle did here https://www.s2ki.com/forums/automoti.../#post25001026

 

It's plumbed in wrong. The recirc valve looks to be on the pre supercharger/filter side. Its doing nothing. It needs to be after the supercharger, on the charge pipe end on the TB side. Your boosting pressure is being forced back into the mouth of the SC and intake filter. Hopefully you haven't blown the SC seals yet. Stop driving until you get a bung welded on to the charge pipe. Also the stock recirc valve solely on its own isn't a good match for the 1200 at the minimum boost levels it operates in 9psi+. Its good for 7-8psi max. After that, something larger for more evac capability would be best. But anything would be better than what you have now, which is nothing!

 

Thanks for the comments. I like the idea about the more robust bypass valve. That would be a great fix if it it gets it done. The install was done professionally by a top shop so I cannot imagine they would have plumbed it wrong. Here's a few more pictures to see if that helps.

 

Ok. Trying to get a good pic to help out. In the photo below the valve is on the right side labeled as "A". That is plumbed and connected to the pipe above, which is the intake pipe with the air filter attached. To the left of that is what I have labeled as "B". That is connected to the curved pipe that goes into the supercharger. Happy to take more photos, a video, video with sound. Whatever you guys think would help. Thanks again.

 

It looks like the plumbing is done correctly, but if that's a VW style bypass valve, it's installed the wrong way/ orientation. The bypass valve, which has the vacuum line connected at the bottom needs to be turned around, so the valve is flipped. The input is currently going to the output, and output is going to the input.

Also, as was said earlier, that bypass valve is too small for the amount of air the blower is creating. I had something similarly setup, but ended up adding an additional bypass valve as I was getting compressor surge, which is probably what you're hearing right now.

 

This. The chirping sound you are hearing isn't from the valve. Its the sc itself screaming in pain. Its making this fire hose of air which is too much for engine si has to go somewhere else. Tries to go through the garden hose of bypass recirculation valve, but can't all fit. So the blast of super dense air gets forced backwards through sc blades. That is the chirping. Compressor surge.

That air has been known to break sc blades. Its dense, hard air, under pressure, that is slamming its way through blades spinning against it the wrong way. Blades smashing hard air. Air whistling as it forces its way through.

Tbis is why you don't hear it under acceleration, as engine consumes most of the boosted air, so it doesn't have to try to go through bypass, doesn't back up into reverse flow through blower.

Like others already said, you need to fix this before driving it.

 

I don't think switching position of the bypass valve matters much, it works either way.
It might be slightly better the other way, but it's still going to be way to small and restrictive in this application.

 

Really appreciate all the input. So it sounds like the main thing I need to do right now is get a new, bigger bypass valve in there to deal with all that extra air.

 

You guys ever used this diverter valve before - https://www.uspmotorsports.com/produ...hoCTpoQAvD_BwE