synchros are like tiny copper clutches on your dog gears to engage the speeds in the box. they simply allow the ***** on the side of the selector thingy to fit into the holes in the side of the gear you're choosing to drive the wheels through without grinding (presuming you don't just mush it in there all at once).

your synchros won't be very damaged, at least as not as i hope your engine isn't (13K rpm or something??)

 

Doubt you did any damage to the synchros. And I would imagine the "fuel cutoff" would come into play to keep you from overrevving it as you went into 2nd. Did the engine "stumble" when you hit 2nd? If so, then the computer did it's job by not allowing you to over rev.

 

A rev limiter won't stop you from mechanically over-revving a motor.
If you are spinning 9k in 3rd and you shift to second, the inertia of the car will drag the motor up to 13k or whatever, even if you are off the throttle.

 

Interesting concept about the rev-limiter! The physics of what is happening here will cause the engine to spin up as fast as it needs to, accompanied by some pretty wild compression braking.

Cheers,
Hymee.

 

I downshifted from 6 to 2nd on the highway once. I was trying
to keep up with a guy which were playing with me.

Luckly I was only doing 75 when I let go of the clutch in second gear.. Bells and whistles rang and I hit the clutch again fast.

First time I have seen my rpms at 10k.

So, be aware of downshifting from 6 to 4, you might hit 2

Should be a small (or large!) indicator somewhere showing
you what gear you are in so I avoid doing n00b stuff like this.

/twospoons

 

You guys are right...I didn't take the movement of the car into consideration when I posted. But wouldn't the fuel cutoff hit immediately, essentially "stopping the engine" if this happened?

That said, I would think the "jerking" caused by the compression braking and the sound of the engine spinning into the stratosphere would keep someone from fully engaging the clutch when this happens.

 

Yes - you would think you would get the picture before you let the clutch all the way out, but most guys doing this are in a hurry to beat someone - changing down from a cuise rev range to a power/acelerating rev-range.

Cuting the fuel has no effect on the inertia of the car/drivetrain on the engine. Even without fuel, it is effectively being driven like air pump.

Cheers,
Hymee.

 

Here's some info on synchro's for ya.

http://auto.howstuffworks.com/transmission4.htm

 

usually the first sign of a synchro going is gear clash from 2nd to 1st, 3rd to 2nd etc. This was happening to me in my S4.

 

I was more worried that the messed up synchros would affect my shifts and cause me to shift in the wrong gear. I guess this is just a noob error. i didn't fully engage cuz as i let off the clutch the car started to brake and i knew what just happened. thanks for the info.

 

Yea....you're right. I keep thinking that cutting off the fuel will stop the engine "dead"....that's not the case here.

 

My god, 3rd gear at 9k - how fast were you goin'? I hope this was on a track and not a public street.

 

And there are some people that want an even SHORTER throw shifter...

 

How about a public highway? BTW: It wasn't me.

But damn...4th at 9K RPM to 2nd?!

Well...the rotaries are known to love rev's, right?

 

umm 3AM empty highway. BTW i was upshifting not downshifting. 9k at 3rd is only 90

 

I really shouldn't have to buy anything for a brand new car to function correctly. BTW: I'm still waiting for my dealer to find out what he's supposed to do to my car

 

In general Ive beendriving the car the past few nights likean ******* b/c Christmastraffic has been insane and frustrating. My Rx8 is auto btw. At onepoint lastnight I just wantedto get the hell home already I was speeding through the road to get out of the congestion and then this prickin a 350Z cut me off and I reallyalmost collided w/this guy man. As I was driving in sportmode in 3rd gear I held onto my horn and honked and put the gear into neutral and revved the gas whilethe car was moving. Likean angrymoron I put the car back into drive beforeRPMs fell back down to 1000 and the transmission like went bizzare fora second like it was confused and the car jolted a little. Very stupidmove. I got to a stoplight w/the guy and he started revving his car likehe wanted to race and I rolled down my window and gave him the finger since Iknew I just didsomething really bad to the transmission.

Now today Ive noticed that when drivingthe car in automatic andnot sportmode I feel little jolts that I guess are happening whenever the computer is shifting into a higher gear. Itdoesnt feel smooth anymore like it used to. I guessI must have done more damagethan I thought up by revving while accelerating andthen dropping back to drive before the RPMs fellback down. I guess Im goingto have to get the transmission replaced now. ThankGod for bumper-to-bumper warranty.

 

it shouldn't mess up your engine. you should have it checked out though.

 

Hehehe - but it might have rooted his tranny.

Lets hope for JeRKy sake they dont refer to the "abuse" clause in the warranty.

Careful what you admit to here JeRKy, ppl do monitor this forum!

Cheers,
Hymee.

 

Ouch Jerky, well I can't fault you any more than you had admitted yourself, that was as honest as you can get. When it's time to go to the dealer it will be in your better interest not to be so honest. Check that 'road rage' and hopefully you can get the dealer to fix whatever the problem is, good luck.

 

A jackass and his car...are soon parted.

You did a dumb-*** thing... you fvcked up the tranny..and the Mazda souldn't be responsible for it. Might as well have shifted into 2nd gear from 130mph..wtf do you expect?

 

Amazing how someone honestly tells what he did, pre-acknowledges he fucked-up, yet it never fails for someone else to state the obvious, bravo... Thanks for the late breaking news...

 

You've admitted to your shortcomings, and its already been discussed. I'll point out one other thing, namely when things are happening quick is no time to reach for the horn. Focus on controlling the car; honking at the SOB is a luxury once everything else is under control no matter how bad he deserves it.

 

That part is funny sh*t, but the rest of the story is pretty bad. Hope the dealership warranties it for you.

 

I agree that part was pretty funny. I wouldn't want to do that here in LA, too many loony peoples. Last time my friend cut this Accord off, they followed us back to his house, but instead of going to the house, we drove to the local PD. Frickin scary and funny at the same time.