hhcheng23

Recently I noticed under WOT my car is making a whining sound around red line rpm (right before auto shift point). Best way to describe the sound is like sound of supercharger. Whining sound only last 1-2 seconds and go away when shift to next gear. Is it normal? Anything I should check. I have a data logger if that helps but I dont know what data I should look at? I will try to take a video to capture the sound if possible when i get a chance.Thank you in advance for any input.

iddrew

I am experiencing the same EXACT issue. it doesn't always happen but it's right up near readline and sounds like a roots supercharger. My guess so far is it's 1 of 3 things: 1) A dodgy pulley 2) the torque converter 3) turbos

My Mechanic couldn't figure it out. So hoping we can figure something out here together. I also have a data logger if anyone offers any guidance.

elitex

Turbo whine maybe?

Davedg

Have a look for a vacuum leak. High whines can be from air leaking out of a bad hose or loose connection or even in serious cases intake gasket.

Jimmy_c63s

Is your car still doing this? Any updates on the whining sound?

LessIsMore

I posted this in another thread on the same topic I think a while back, but bottom line I wonder if this is the traction control kicking in via the diverter valves to limit boost.

If you look at the diverter valve in our car the one on the driver side has a tube that goes back into the throttle body. The diverter valves also have wires going to them, so makes me wonder if the ECU has the ability to manipulate the diverter valve action to bleed off boost to control traction/stability, independent of the throttle, and when that happens is creates the whine noise.

See if you can produce it with traction control completely disabled.

Behind The Bibs

Think this noise is the same as in my thread ‘Turbo Scream’ which is on the first page of forum presently

Noise is intermittent, last time I heard it car seemed to be performing really well

Call me Mr Thickie if you want but what is WOT?

milan25

Wide open throttle...gas pedal to the floor

C63sAMG

Mine dose the same thing it usually happens in hot weather. It reaches 115 + where I live.I believe its from the turbos as it only happens after repeated pulls in hot weather.It worries me also I take it easy after hearing the noise.

I miss naturally aspirated engines .Eu loves to ruin good things.I love my C63s but it will be my last one however I am planning to keep it forever.I am really upset that it will be the last V8 C63.

46m3csl

I'm getting the same exact noise as this , seems like some sort of turbo noise maybe but can't reproduce the noise all the time but does happen near redline, anyone get it sorted out ? Definitely not normal

Ghostec15

I’m not sure if I’m getting the same sound as you guys are but I recently got a Weistec Stage 1 tune and since then have been getting a “whoo” sound around 2800-3500 rpm.

shane060

Did anyone ever figure this sound out? My 2018 C63s with 29k miles is doing a weird whine\ heeeee sound during 3rd gear shifts WOT near redline. sounds like its coming from behind the dash where the intakes are around the top area of the engine bay.

OirishKev

I have a 2019 C63, producing the same noise. Any ideas?

Jimmy_c63s

Just a characteristic of the stock turbos. I know so because I changed the turbos to hybrids and never had that sound again.
Drove another member's car on here (George) and his car has the same weeee sound if you have all windows down and it's a quiet road at WOT. Sometimes it didn't do it at all!!

In my car I drove my PFL turbos with that sound for over 50,000 miles and gave them a hard time and had multiple tunes on mine. They never let me down... always full boost

Honestly wouldn't stress at all unless the sound is starting to get a lot louder.

46m3csl

Still having that noise 4 years later down the road , happens right around redline . Sound like supercharger whine , goes away when getting into the next gear. Would love for someone to figure this one out, also drives me nuts thinking something is going go wrong when driving it hard near redline lol