engine whirring?
 

I just bought my car (09 6MT Sport) about a month ago, and I didn't notice this until I got it home. But when I'm crusing in first through third (e.g. driving through a parking lot or the neighborhood 1.5k~3k rpm) there is a distinct whirring noise.

At first I thought it was only on the inside, but when I opened the window, it was louder! It's not like it's unbearably loud, but it's not a noise I expected from a sports car.

I was wondering if anyone else has this noise, and if so, is there a way to get rid of this noise.

Where's the whirring coming from? Our transmissions are noisy.

I believe the whirring is the ABS unit, under the hood, testing itself. The is TSB NTB10-077:


ABS SELF CHECK NOISE

APPLIED VEHICLES: All Nissan Vehicles with ABS or ABS/VDC

SERVICE INFORMATION

If you identify:

• Clicking, knocking, clunking, buzzing, or thumping noise coming from the engine compartment area; and

• The noise occurs only once during the first few seconds of driving at approximately 16 MPH; and

• The noise occurs only once per ignition cycle (ignition OFF > ON) and does not occur again until the ignition is cycled.

NOTE: The noise may be louder after the vehicle has not been operated for a prolonged period of time.

The above condition is normal and does not need repair.

Each time the ignition is turned on and the vehicle is driven at about 16 mph, the ABS/VDC system performs a “Self-Check” to confirm components of the ABS/VDC system are operating correctly.

This “Self-Check” function creates the noise described above.
If the brakes are being applied when the “Self-Check” occurs, a vibration may be felt in the brake pedal and an increased level of noise may be noticed.

NOTE:

• Refer customers to the Owners Manual, Section 5, Starting and driving, Brake system on the Anti-Lock Braking System (ABS). The “Self-test feature” section provides additional explanation.

• The speeds described above refer specifically to Versa, Sentra, Altima, and Maxima. However, any vehicle fitted with ABS or ABS/VDC will have a “Self-Check” which is triggered in similar circumstances.

it happens whenever I'm holding a steady speed at a low gear (usually going slow). it's not a one time only type deal, when I press the gas it sounds like the whirr is tightening up, when i left off the gas the whirr gets looser? if that makes sense...

it's fine at the upper gears.

thanks for the quick replies xD, even if my car makes weird noises, i love it. haha

Its a normal sound if that helps any.. Mine does the same thing

ah okay, that's good news, although it's a tad annoying haha.

I always assumed that it was just the engine winding up.. I dunno.

Feast your eyes on this: http://www.the370z.com/engine-drivet...r-install.html

In retrospect, I think I was being more vigilant after the oil cooler install and just started noticing the whirring that was already there.

There have been a few discussions about ECU whine, such as in this thread:
http://www.the370z.com/engine-drivet...noise-ecu.html I hear it to. I'm pretty sure my aftermarket exhaust will drown it out once installed.

Doesn't seem like he's describing the ECU sound.

I went back and read the OP more closely and saw that it changes sound and then goes away as higher gears are reached. My bad:tiphat: