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'06 C2S cab chirping under acceleraton

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I have a modified '06 997.1 C2S cab (6sp MT) with 58K miles.

Modifications include:

-Vividracing single turbo kit with custom exhaust (200 cell race cats)

- short shifter

- stage 2 clutch

At the time of the turbo install, I also had the water pump and the expansion tank replaced as well as the shifter linkage cable.

Last night, after a short stint of WOT acceleration, I noticed a distinct chirping in the engine compartment. The chirping only comes on during acceleration (not during constant speed or idle) and increases in frequency as speed increases.

I'm thinking it is a belt (serpentine belt? Other belt?).

Open to comments/opinions/suggestions.

I read on another forum that spraying WD40 on the surface of the serpentine belt makes the chirp go away. Any risks or downsides to that trick?

I will be going in for 60K service soon, which will also involve a full brake replacement on all 4 corners, and I would like to wait until then to address the chirp permanently.

I look forward to any comments this forum may provide.

Edited by pvanosta
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  • 2 weeks later...

Seeing that you get the chirping under WOT it could be as simple as the waste gate opening if it is dumped directly into the atmosphere. If it is plumbed into the exhaust system then you probably would not hear it in which case it is something else.


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The question is at what frequency is the chirping. When a wheel bearing goes you here a rhythmic grinding that goes at wheel revolution speed. As speed picks up it turns into a harmonic ringing. If you drop the clutch and take your foot off the gas the grinding/ringing continues at wheel rev speed. An accessory drive problem is going to sing at engine rev speed. When you drop the clutch and take your foot off the gas it will slow right down. Your chirping also occurs only under load and I can't see how an accessory drive problem would do that as it is not subject to an abrupt change in load under acceleration. Certainly, the wheel bearings, differential and transmission bearings are stressed under WOT conditions. My car likes to chirp at engine speed on cold start up. It goes away when the car is warm.

Do not spray WD 40 on the belt. The solvents in it will attack the rubber. WD 40 is also very volatile. Any benefit it has as a lubricant is gone in about 72 hours. If a belt is slipping the solution is to increase the tension. Lubing the belt is only going to make it slip more. If you feel like you have to do something you can treat the belt with Meguiar's #40. Not sure that it will help any but at at least it can't hurt and your belt will be nice and black.

Edited by Mijostyn
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