[WScottCross]

I can definitely hear my turbo spool and especially bypass when shifting. Some folks can't hear it. Can you? What is your setup if you can?

 

[moshaholic2]

Yes I can.

mountune induction kit

 

[Kevin R]

Only if the windows are open

 

[Firesail]

Yes I can. Full mountune induction kit w/ induction hose. I want to get the mTune w/ MP215. I do have Cobb AP w/ 93 octane tune.

 

[MasterPooBaa]

Stock setup here.
Yes (Just) if i concentrate hard with windows up.
Better with windows down.

Ditto with the turbo spooling up and applying boost. Its a very rewarding sound.

 

[psylentknight22]

Fswerks

 

[dislegal]

Yep, sure can and it doesn't matter if the windows are up or down. Stock setup and I was completely thrown when I first drove it and heard it!

 

[BRGT350]

I could hear it with the factory intake, but had trouble getting the sound to show up on film when we were recording for the Fiesta Movement. The ST I drove in Brazil seemed to have the loudest turbo bypass of any ST I have heard. That one wasn't a production car.

 

[jimclark]

WScottCross, dislegal, BRGT350, others: could you guys please describe the sound you're hearing, and when you can best hear it? I'm chasing an extra couple of sounds that may or may not be related. Techs at the dealer are less than helpful thus far. It might be embarrassing if the sounds that are bugging me are all turbo-related, but I would sleep better at night not worrying about the baby. :bucktooth:

 

[BRGT350]

Pssssssshhhhhhhh when you lift off the accelerator. I noticed the sound when in 4th gear about 40mph when the throttle is opened and closed quickly. As soon as the throttle plate closes, you hear the psssssshhhh sound. If you are next to a guard rail, trees, parked cars, or a building with the windows down, it is very noticable. When I went to record the exhaust sound of the Fiesta Movement ST, I followed a route that had nothing near the road to bounce the sound off of, and could not get the bypass valve sound to show up on the video. When I was driving the ST in Brazil, the road was lined with dense trees and the sound could be heard very clearly.

 

[dislegal]

Yep BRGT350 has it spot on, I hear it mostly shifting into 4th and 5th. Feathering the accelerator at quite a few revs in 3rd I can trigger the noise almost on command. I'll see if I can get a recording of it for you.

 

[jimclark]

Perfect! Thanks, guys. I believe that's exactly the sound I hear that I was thinking of as "turbo spool/spin-down". I see that bypass is the preferred term. Good. Unfortunately, that still leaves me with the sound(s) (primarily, at least, a single sound) I'm hearing, which seems to come from the same side of the engine bay, and is heard in the same RPM range (typically, though slightly variable, in 2-3K range) in all gears (best in lower gears, as there is lower ambient noise). It is variable in its intensity, at times being fairly easily discerned, at others difficult to make out. The sound reminds me of the sort of whistling sound that air can make rushing through a cracked-open window. It does not occur with the car in neutral and the engine revved. When it's fairly easy to hear, as it was yesterday evening, for instance, I can get it to become more or less continuous if I can run the same RPM under the same load (as, for instance, on a flat stretch of road, constant speed, constant RPMs of, say, 2.5K) for a bit (up to 5-10 secs). It's driving me just a little batty.

 

[BRGT350]

hmmm, so the sound is load dependant. I was thinking the sound symposer tube, but that would make the noise at all times. Can you hear it from outside the car when it drives by?

 

[jimclark]

hmmm, so the sound is load dependant. I was thinking the sound symposer tube, but that would make the noise at all times. Can you hear it from outside the car when it drives by?

I've not had the chance to listen from outside the vehicle. (Wife doesn't drive manual.) I've been told by one ostensibly reliable observer that he could hear it, though it wasn't loud.

 

[jimclark]

And because it's variable in intensity--so much so that when I took it to the dealer, in fairness even I had a hard time making it out, yet at other times even my wife readily notices it--I have a hard time classifying it as purely incidental/normal. Especially as two weeks ago I'd never noticed it. Combining all these factors--obviously related to mechanical function, load-dependent, variable intensity, and new--it's in the category I have to call abnormal, and potentially indicative of malfunction of some sort. (I'm obviously hoping that any malfunction is mild and of no consequence.) Thus, my increasing obsession with the thing.

 

[joker96]

Loudly

Sent from my HTC One_M8 using Tapatalk

 

[eRic]

we can really hear it with the Green air filter. ask BRGT350 :whistling:

 

[limbo]

Yes I hear it - bone stock

 

[BlueBomber]

Injen I heard it and every other car close by heard it - Stock, you can hear it sometimes with the windows down.

Stock with a modded lower airbox and high flow filter, you hear it more but still fairly subtle.

 

[Methane Herder]

No induction modifications. At lower RPM's, floor it briefly and lift off, gives a nice whossshhh.
MH