[acg69]

When I hit about 5000 to 5500 rpm's I hear a whistling noise that subsides as rpm's get higher. I am pretty sure that the whistling noise wasn't there before the mods, which were done all at the same time (BSR PPC, BSR exhaust and BMC air filter).

I was at the dealer's today to get something and told them about it. They checked the car, said I need not worry about it but pointed to either the BMC air filter or the ppc as the culprit (which was to be expected of course).

I exchanged the air filter with the stock and it still whistles. I didn't have time to uninstall the ppc and check if the whistling is still there (I will do that on Friday hopefully) but I was wondering if any of you with BSR's ppc have noticed this whistling noise as well. Maybe it has to do with the turbo pressure?

 

[jdog]

I thought BSR PPC was a soft loader. How could you not have time?

 

[acg69]

I came home from work about 10 pm for the 3rd day in a row, having had food poisoning over the weekend... Let's just say that I am very close to dead at this point

 

[IwantaS60R]

Re: Whistling noise @ 5000 - 5500 rpm (acg69)

Quote, originally posted by acg69 »

When I hit about 5000 to 5500 rpm's I hear a whistling noise that subsides as rpm's get higher. I am pretty sure that the whistling noise wasn't there before the mods, which were done all at the same time (BSR PPC, BSR exhaust and BMC air filter). I was at the dealer's today to get something and told them about it. They checked the car, said I need not worry about it but pointed to either the BMC air filter or the ppc as the culprit (which was to be expected of course). I exchanged the air filter with the stock and it still whistles. I didn't have time to uninstall the ppc and check if the whistling is still there (I will do that on Friday hopefully) but I was wondering if any of you with BSR's ppc have noticed this whistling noise as well. Maybe it has to do with the turbo pressure?

It's not the PPC. I had the same thing happen after I changed my catback to the Jetex (BSR catback=Jetex catback). I initially thought there was something wrong (leak, exhaust touching the drive shaft, etc.) but after checking, everything was fine (no leaks, etc.). I then chalked it up to a change in harmonics caused by the new catback. It actually sounded cool to me

so I left it alone. I believe I've seen someone who added the EST catback (EST catback = BSR catback = Jetex catback) post about this exact thing on SS recently.

I want to add though, that the whistle completely went away after I installed the Ferrita DP (3" piping all the way).

 

[JRL]

Re: Whistling noise @ 5000 - 5500 rpm (acg69)

When I hit about 5000 to 5500 rpm's I hear a whistling noise that . Maybe it has to do with the turbo pressure?[/QUOTE]

Gee, ya think...

along with a freer flowing air filter an exhaust and whatever else you did?

 

[Vipergtsz3]

Re: Whistling noise @ 5000 - 5500 rpm (acg69)

Do you get the whistling noise only when the car is moving or does it happen even when you just rev the engine while at a standstill?

 

[acg69]

Good question. Only when it is moving.

 

[OwlsInBog]

Re: Whistling noise @ 5000 - 5500 rpm (acg69)

I have the same thing. Sure got my attention the first time I heard it! I had the BSR PPC loaded for about a week before I mounted the exhaust - no noise at all. But when I installed the exhaust, I would get the whistle/screech sound up around 6K - only under heavy load/hard accel. Checked exhaust and down pipe for signs of leak or loose fitting or cracks, but all is tight. I was hoping to have Frank give a listen at the Carlisle show, but didn't get the time to go for a ride.

I haven't gone through all the intake plumbing yet to see if there is a loose clamp that might be letting air out under high boost. Is there a relief valve anywhere in the intake plumbing (other than the turbo bypass valve) that will bleed off pressure under overboost to prevent damage to I/C, etc??

I am still running the stock filter, so it is good to hear that the filter makes no difference - I had thought maybe the stock filter wasn't giving enough air.

 

[acg69]

I will probably replace the exhaust with the stock one and see if this is the culprit for sure.

 

[acg69]

It is the exhaust for sure. I just replaced the stock and the whistling is gone. Oh well... There goes the nice, bassy sound I got used to the last couple of weeks...