bigfoot1612

Hi,
My evo 7 seems to be making a whine during acceleration (making me thing it may not be a diff whine). Any ideas on what this noise could be? Pls see video url. Also there is a crackling sort of noise at part throttle in 3-4-5 gears which goes away when the throttle is buried. I am trying to figure out what these noises are. Any help would be extremely appreciated.
http://www.youtube.com/watch?v=kSyFYgdE1io

BoosTyEVO

bump ? I'm having this same issue in my evo 8 2003

HISEVO7

iTrader: (4)

Very interesting. My 2002 Evo VII still sounds like new. I'd love to know what that sound is!

dh19evo

I am hearing the same noise in my 03 evo 8 but the whine is not as loud and it only
does it in fourth gear.

Chaser_41

iTrader: (3)

Damn ! What's weird is it stops at certain points.... Strange. In for results

barneyb

Kinda sounds like ring and pinion noise to me.

Fastone_evo6

Shure that somethings is not right but you will never know if you dont open the diff and have a look ,

it sound like a rally car , whit stright cut gears

BoosTyEVO

bump I have the same issue when gas on i get the sound gas off goes away happens in all gears , I thought it might be the t case but now i wonder if its rear diff is there any easy way to check the location of the sound. When driving today it kinda seems like its coming from the back but its so hard to tell for sure heres a vid of mine

http://www.youtube.com/watch?v=FH-yvGIT3oA

stayabovethelaw

iTrader: (23)

i have the same issue and had it for a while nothing broke yet... thank god... couldnt figure out what it was

cmspaz

iTrader: (1)

Interesting. It sounds way too loud to be the rear diff, but it only whines when the rear diff would normally whine. You guys have upgraded rear diff bushings?

Jonesey I7

iTrader: (10)

I do have different rear diff bushings, and I have the same whine.

shattered-4g63

That weird because it's going away a little when you don't give it gas and then whining when you do. Shouldn't a diff issue whine all the time and get worse at higher speeds?

cmspaz

iTrader: (1)

The rear diff noise has to do with the angle the pinion engages the ring, and that angle changes when torque is applied. That's why it only makes noise under light acceleration.

The t-case, on the other hand, makes noise all the time.

Jonesey I7

iTrader: (10)

Just an update as for my 2cents. Changed the diff fluid today, and noticed my back two tired are cupped on the insides of each tire. Also my tires are Nitto nt555's, which are loud tires period. Changing the fluid helped a little. My master mechanic buddy says it's pure tire noise AND all the upgraded bushings I have... as my lash is in check perfect to spec.

gray9evo

iTrader: (1)

Anyone figure out what this noise is that only happens under acceleration? I have the same exact problem