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Any NB8B guys, can you try something for me?
can you find a quiet sort of place, go up to like 50-60km/h, get out of gear and into neutral, release and clutch and try to engage first gear. Now don't exactly try to get into gear, but apply a little force so the synchro is engaged. Tell me do you hear a whirring sort of sound, kind of like 2 straight cut gears are moving together?

i mean is this normal? are the synchros supposed to make that noise?

I must say trying to push into 1st while going at 50-60km/h doesn't sound like my gearbox's idea of fun

if it only happens under the conditions that you mentioned then I wouldn't be worried
if not then post up what you are actually doing when you hear this sound

sorry i don't mean actually engage first gear, but place a little pressure on it such that the synchros spin up.

i also hear this sound when i'm in first gear and i'm accelerating. This also occurs but to a lesser extent in 2nd and to an even lesser extent in 3rd.

Normal.

normal mechanical noize?

Sounds normal to me.

Stupid thing to be doing to the poor box.

erven if anything is starting to go wrong with the box, you dont need to worry for a long while
is it a whining noise like a supercharger or whirring?

stevesports wrote:Any NB8B guys, can you try something for me?
can you find a quiet sort of place, go up to like 50-60km/h, get out of gear and into neutral, release and clutch and try to engage first gear. Now don't exactly try to get into gear, but apply a little force so the synchro is engaged. Tell me do you hear a whirring sort of sound, kind of like 2 straight cut gears are moving together?

i mean is this normal? are the synchros supposed to make that noise?

Sounds like you need a new hamster.

whining noise sorry. Kind of like a supercharger i guess. I can tell it is the synchro spinning up.

The gearbox is trying to tell you \"don't do this to me!\"

Let me explain it this way, there is a whining noise when i am in first gear and accelerating. It is less prominate as i move up the gears. Faint in 2nd gear, even less audible in 3rd and inaudible in 4th. In addition, the sound decreases as the gearbox warms up.

the reason i explained the above situation is to isolate the problem. As i said, i've narrowed the noise down to synchros (which i think is correct).

You would have to ride in/drive another similar model MX-5 under the same conditions to see if what you're experiencing is normal or not.

It's impossible to draw worthwhile conclusions on a chat board.

i had the same problem/ have the same problem... its a bering failure in the gearbox (i think countershaft bearing)... i had the same small noise about a year ago.. and now its quite audible...

typical problem with mexy gboxes... you can find topics with the same problems in miata.net forums....

One thing that can contribute to gearbox noise in the mx5 is the proximity of the gearbox to yourself.

I know my NA6 has a bit of gearbox noise, as does ever one i've been in so I would say its typical. I've never been in a nb so I cant on them.

I would recomend a back to back test, maybe take a mate down to a car yard with a nb and go for a test drive.

Dont worry bro your goin to change the fluids on dodgy day

So we will get to see all the chunks of metal stuck the the magnetic plug from all that whirling noise in the gear box