Rear end harmonic noise

[aggiegrad05]

They wouldn’t be making noise in the rear end

My ecoboost whistle sounds like it’s coming from the rear...no question. At least while driving. And the rear passenger side, so just about right where the exhaust pipe is.

 

[J Ski]

They must’ve moved the turbos back about 8’ on the newer models

 

[aggiegrad05]

They must’ve moved the turbos back about 8’ on the newer models

Haha! I know the turbos aren’t back there, I’m just saying when the boost kicks in, at least while driving, the whistle definitely sounds like it’s coming from the back. I’m guessing it’s because of the added sound insulation (maybe only on the plati?) or has something to do with the fake engine noise they pipe in. Honestly I can hear VERY little engine noise at all, even when I get angry with the go-fast pedal.

 

[Artie]

Haha! I know the turbos aren’t back there, I’m just saying when the boost kicks in, at least while driving, the whistle definitely sounds like it’s coming from the back. I’m guessing it’s because of the added sound insulation (maybe only on the plati?) or has something to do with the fake engine noise they pipe in. Honestly I can hear VERY little engine noise at all, even when I get angry with the go-fast pedal.

Same here, I don’t hear much at all after start up. I’ve yet to hear the turbos as well and I’ve gotten in the throttle several times.

 

[J Ski]

Same here, I don’t hear much at all after start up. I’ve yet to hear the turbos as well and I’ve gotten in the throttle several times.

Upgrade that intake system and you’ll hear them

 

[Artie]

Upgrade that intake system and you’ll hear them

I like it quiet and 450hp is plenty for my needs.

 

[Bones]

I purchased my 2018 Expy Platinum Max new and started hearing the humming noise right away while driving. It doesn't do it all of the time and the volume fluctuates in intensity and not reproducible. I tried driving with the sound system off and it didn't make any difference. Then the Expy threw a curve at me; I started it after being off for the night and was in park idling and the humming started and got very loud. It caught me off guard and I didn't think to turn off the engine. After about 10 seconds it stopped. I should also clarify that the humming is coming from the rear and I don't have the tow package.

 

[proeasy]

Electric Fuel Pump?

 

[drjeff]

I have have not had turbos before and are they operating at slow startup speeds? The fuel pump would not make noise only when the wheels are turning I would think.

 

[J Ski]

I have have not had turbos before and are they operating at slow startup speeds? The fuel pump would not make noise only when the wheels are turning I would think.

They don’t kick in until enough pressure is built up