Odd sound only in sport

[powerboatr]

I was setting up my Bluetooth obd mx plus
Scanning through pids for display on an unused phone
Anyway radio off, ac off
Sitting in driveway engine running up to 179 f
I put car in towhaul to see if it changed some pid locations in a menu
But when I selected sport
Car in N. Park brake on
I hear a weird continuous different bnoise
Came from under car.
I rolled down window and recorded it woth phone

If I didn't know better ..i would say it sounded like it opened a valve in a muffler or something , not a hiss, but like a valve opened direction the noise through a different route
I have stock exhaust
I tried uploading the sound
But it won't upload
It reminds me of when I switch on exhaust brake on my 8.3 isc engine ..

 

[Cruising68]

I was setting up my Bluetooth obd mx plus
Scanning through pids for display on an unused phone
Anyway radio off, ac off
Sitting in driveway engine running up to 179 f
I put car in towhaul to see if it changed some pid locations in a menu
But when I selected sport
Car in N. Park brake on
I hear a weird continuous different bnoise
Came from under car.
I rolled down window and recorded it woth phone

If I didn't know better ..i would say it sounded like it opened a valve in a muffler or something , not a hiss, but like a valve opened direction the noise through a different route
I have stock exhaust
I tried uploading the sound
But it won't upload
It reminds me of when I switch on exhaust brake on my 8.3 isc engine ..

Lots of mechanical and electrical noises on this car for sure!

Only thing I hear sounding like you describe is on cold starts. Amplified with an exhaust. Seems to be three stages. First good and rumble when I start, then after about 15-20 seconds it kicks down a bit quieter, then another 15-20 seconds it drops down to normal. Definitely something changing the sound. Could just be fuel enrichment at start I suppose.

Don’t know if the turbos have anything to do with it but when I did my downpipes I noticed something at the exit of the turbos. Might have just been the top of the impeller or some type of valve. I didn’t really pay any attention to it other than noticing it before I put the DPs on.


Sent from my iPad using Tapatalk

 

[powerboatr]

This way past normal start
Engine was warm. Had been running overv10 minutes some at high idle
Then normal idle
As I was lookfor trsns temp to load gauge on android phone
I can see it in forscan..but having a tough one to find it in the same pids
So I was switching modes to see if it showed up..that's when I heard it from outside

 

[UNBROKEN]

Trans pressure changes in Sport mode…I’d guess you heard the pump when that happened. Perfectly normal.

 

[powerboatr]

Thanks it's quite noticeable
But isn't the pump running if engine is on
It really sounds like the variable exhaust vanes in a 6.7 super duty
When it tries to build a bit of positive boost right off idle
I will stop wearing my hearing aid. I heard all kinds of stuff

 

[powerboatr]

Went out hood open
Phone near left engine bank
Then sport same place..sounds like timing changed??if you did old school twist of distributor

 

[UNBROKEN]

I still bet it’s the pump.

 

[powerboatr]

Weird.. but
I accept that
Wife said ......no more hearing aid wearing in her car