Whiny Screechy Noise when in 1st-4th Gear

SouthArk370Z

A passenger should be able to tell if the whine is coming from the ECM (near their feet) or the transmission (on their left side). Or pull the carpet/trim back from the ECM and see if it gets louder.

I haven't heard what the Z's ECM sounds like (mine is quiet or maybe my ears have gotten too old to hear it) but on ones that I have heard, it was a high-pitched (higher than what I associate with gear whine) "squeal." Your screechy may be what I call a squeal.

Edit: And gear whine will usually vary in frequency with speed while ECM whine is usually constant.

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Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

madaz

Thanks for the response. In the event that it's gear whine, what should be the proper course of action?

__________________
My 2009 Nissan 370Z Touring w/ Nav Pearl White 6MT
Tints 17% Front, 5% Back | Plastidipped Emblems | JDM Rear Fog Light Installed

SouthArk370Z

I don't know. If we were talking about a Ford design four speed (AKA toploader) from the '60s, I would be in a better position to help.

The main sources of manual transmission whine that I can think of are:
* Gear noise. Check trans lube. Replace if needed. Try a different brand/weight fluid.
* Shifter vibration. Once again, I would be able to help if this were a much older car. The FSM would be a good place to start.
* Transmission mount (or other drivetrain mount): Usually a lower frequency "rumble" but might be worth taking a look at.

Those should apply to most geared, rotating equipment. Some of the members that are more familiar with the 6MT will probably have more specific advice/pointers.

__________________
Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub
Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

madaz

Hey guys, here's a short clip about what I mean, Sorry about the sideways video don't know why it came out like that, but the sound is all you need.

I was in a parking lot so I was only in first gear low RPM, but the sound is similar to that and more prominent over 3000RPM. Let me know what you guys think is causing this?

https://www.youtube.com/watch?v=bWvq...ature=youtu.be

__________________
My 2009 Nissan 370Z Touring w/ Nav Pearl White 6MT
Tints 17% Front, 5% Back | Plastidipped Emblems | JDM Rear Fog Light Installed

Haboob

Here's it embedded.



Sounds like normal tranny whine to me? I didn't hear anything out of the ordinary.

madaz

So it's still normal if it's making the same noise over 3000 RPM in 3rd-4th gear? The reason why I bring it up is because my friend has been driving manual for years and thought it was kinda weird.

__________________
My 2009 Nissan 370Z Touring w/ Nav Pearl White 6MT
Tints 17% Front, 5% Back | Plastidipped Emblems | JDM Rear Fog Light Installed

barncobob

sounds like gear noise to me,,,id change the tranny and rear end fluids to start