One of my G37x S has an odd metallic sounding rattle, rev matching, in the upper band of a normal but hard acceleration. Not flooring it.

Shouldn't I have that checked? Anyone have experience with what I describe?

Could it be the power steering pump straining on the accelerated turn? I've got to get it changed this week.

 

Maybe nothing but my tech at the dealership probably hasn't driven it hard enough to detect it.

 

I sometimes get an odd what sounds like metallic rattle at times when driving somewhat hard under load. Tried getting a tech to ride with me but I couldn't manage to re-create the sound (of course the car decides to be perfect when I finally have a chance to get someone to look at it). Interested to see if you find the cause.

 

How clean is your power steering fluid? I'm wondering if it is the strain on the pump when turning on harder than normal acceleration.