Ford Focus ST Forum banner
1 - 10 of 10 Posts

·
Premium Member
Joined
·
1,269 Posts
Discussion Starter · #1 · (Edited)
So I swapped out and sold the MBRP XP catback system, as the "Boom" was a bit more than I wanted. The Mountune is now installed, and I'm about 80% satisfied (which is pretty good for me). However, I'm noticing a sound at boost that I've never heard before and I'm not sure if it's just normal spooling. Performance seems fine, but when at boost I hear a rolling/mechanical type sound. I didn't notice this when stock, but when stock I had the SS still installed. After the MBRP went in the SS went out. The MBRP was pretty "Boomy" so I would have had a hard time hearing any spool sounds. This is the first turbocharged vehicle that I've ever owned, or have any experience with. I looked around Youtube for spool sound videos. Most of these had turbos that made more whiny sound. So I'm hearing this more mechanical/rolling sound, am I nuts, a dolt, or both, or is this perfectly normal. I did replace the stock BPV with the Mountune BPV a while back, could that have changed the spool sound, perhaps when venting back to the system???
 

·
Registered
Joined
·
206 Posts
I'd try to take a video of the sound and post it. Shouldn't be the Mountune BPV since it doesn't vent to atmosphere, but vents back to the intake manifold and should be pretty close to the sound the stock BPV made. Have you double checked all the hangers and made sure nothing is touching and vibrating or anything?
 

·
Premium Member
Joined
·
1,269 Posts
Discussion Starter · #3 ·
I'd try to take a video of the sound and post it. Shouldn't be the Mountune BPV since it doesn't vent to atmosphere, but vents back to the intake manifold and should be pretty close to the sound the stock BPV made. Have you double checked all the hangers and made sure nothing is touching and vibrating or anything?
Yeah, I'm going to try to get a sound clip. And I did mean the BPV venting back into the manifold (brain fart). I'll give the hangers a look tomorrow.
 

·
Registered
Joined
·
196 Posts
Yeah, I'm going to try to get a sound clip. And I did mean the BPV venting back into the manifold (brain fart). I'll give the hangers a look tomorrow.
I have the Mountune recirculation valve plus a resonator delete on the stock exhaust. There is a chance the stock muffler masks it, but I don't hear anything like you are describing. Either way, I can't imagine a recirculation valve would effect exhaust sound much.
 

·
Premium Member
Joined
·
1,269 Posts
Discussion Starter · #5 ·
Getting ready to try to record the sound I'm hearing. Like I'd stated, all appears to be working fine, just have never heard this before. Possibly it's always been there, and that huge @ss Mountune muffler makes it more noticeable. I'll get a video/ sound clip up ASAP (just have to figure out how to upload a video to Youtube).
 

·
Registered
Joined
·
206 Posts
Getting ready to try to record the sound I'm hearing. Like I'd stated, all appears to be working fine, just have never heard this before. Possibly it's always been there, and that huge @ss Mountune muffler makes it more noticeable. I'll get a video/ sound clip up ASAP (just have to figure out how to upload a video to Youtube).
I believe in you. If I can upload a video to YouTube, anybody can. Lol On another note, how you like that mountune CBE so far? I've been debating back and forth between that and the FSWerks Stealth for a bit.
 

·
Premium Member
Joined
·
1,269 Posts
Discussion Starter · #7 ·
I believe in you. If I can upload a video to YouTube, anybody can. Lol On another note, how you like that mountune CBE so far? I've been debating back and forth between that and the FSWerks Stealth for a bit.
Well, didn't need to make a video. It's just the turbo spool sound that I never was able to hear before. I had a guy down the street go for a ride with me, and he confirmed my suspicions. He used to drive a GTI for a few years, and is no stranger to turbocharged cars.
I'm not unhappy with the Mountune, as the MBRP was a true love/hate relationship. In the world of aftermarket exhaust, the Mountune is quiet, but you do know it's there (yes, it is louder than stock, just not a whole lot). I can say that I wouldn't mind just a little more sound, but I have yet to put on my downpipe. Hopefully, that will give me a little bit more uummphh! In the end, I don't regret it, but if I had to do it over... I would have bought the FSWerks stealth system. I purchased the Mountune last December and it had been sitting in it's box until this week. It is kind of cool to hear the spool!
 

·
Registered
Joined
·
206 Posts
Well, didn't need to make a video. It's just the turbo spool sound that I never was able to hear before. I had a guy down the street go for a ride with me, and he confirmed my suspicions. He used to drive a GTI for a few years, and is no stranger to turbocharged cars.
I'm not unhappy with the Mountune, as the MBRP was a true love/hate relationship. In the world of aftermarket exhaust, the Mountune is quiet, but you do know it's there (yes, it is louder than stock, just not a whole lot). I can say that I wouldn't mind just a little more sound, but I have yet to put on my downpipe. Hopefully, that will give me a little bit more uummphh! In the end, I don't regret it, but if I had to do it over... I would have bought the FSWerks stealth system. I purchased the Mountune last December and it had been sitting in it's box until this week. It is kind of cool to hear the spool!
Glad you got that sound resolved. I have heard the mountune gets a little louder once it fully breaks in, so maybe in a few thousand miles. Please update me on when you install your downpipe, would love to hear your impressions after!
 

·
Registered
Joined
·
530 Posts
Definitely the muffler bearings. Mountune's bearings are pretty audible in the cabin
 
1 - 10 of 10 Posts
Top