For sure..

Read this:

8th Generation Honda Civic Forum - View Single Post - Over Rev Protection

An RPM limiter can only prevent you from accelerating across a threshold where you're over-revving. Once you downshift into a gear that causes you to over-rev, the gears are physically forced to spin at that speed. Electronics can't stop that

BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3) - View Single Post - over revving?

Synchronizers only match the gear and engine speed related to the number of axle rotations. The limiter has no control over the synchronizer so if you pop it from 6 to 3 at 110 you are sure as hell gonna over-rev. When accelerating if the limiter detects the engine has hit redline then it closes the throttle body to slow down the engine but it can't do this during a downshift because it has nothing to do with the throttle body. Word to the wise, the way to avoid this when downshifting is to only downshift one gear at a time and do a heel-toe so that the car is slowing down at the same time you are downshifting.
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I'm confused on how it looked like a grenade went off in your head, but you still could drive it a little.

 

There have already been numerous mechanical over-rev's in the Cobalt community ........ not once have i hear of the PCM ripping the shifter out of someones hands to save the car lol/

 

Dont know drove jerky under accel. but stayed steady at a steady speed. But they said cam shaft bad valves pushed up into shaft but not down against pistons, and warped head.

 

They said that 2 and 4 cylinders were the bad ones and it was running on 2.

 

It's speed vs acceleration .. It doesn't use the ECU as far as I know , if the trans gears rotate faster than the current speed. it pops it out ..
I;ve done it twice , Not sure why urs wouldn't do it ..

I swear to God on my mothers Grave mine does this

 

Yes I am one of them , But it's different when you down shift into the wrong gear , the trans is being loaded up .. Someone could prove to me it doesn't exist Ill shut up but until you can I wont

Mechanical over rev protection system do exist in other cars like Porsche I wouldn't see why the SAAB engineered trans wouldn't have something similar.

I mean GM probably wants to replace every kid's engine because they down shifted wrong once right ?

 

That is why they record the highest RPM reached by the engine in the ECU. It is possible to tell what the max RPM was ever when they hook up to the ECU. They could then say "Sorry, you over-revved it which if you read your manual it says you are no longer covered".

The Stage 1 kit includes a higher limit AND a softer limiter function. If you look up some of the Q&A sessions about the CSS GMS1 on GMTunerSource they specifically mention the softer limiter. Maybe under certain conditions it is possible to easily rev past 6500?

 

Sorry, I don't buy that explanation.

There no way the shifter or tranny *knows* what the revs are or what the speed is. The gear box will accept any input you give it, that's why a misplaced downshift can over rev the motor instantly....the tail is wagging the dog so to speak. If you floor the motor beyond a point, the ECU will sense engine revs and can instantly cut fuel/ignition. Unless you can explain to me HOW you get locked out of a down shift, I say you're wrong here.

 

There was a post here not long ago where some one went to shift into 3rd and it went right into 1st without any problem .... so I'm pretty sure there isn't any type of downshift protection on these cars. No one is going to try and prove you wrong by "money shifting " their car into a mechanical over rev lol.

 

First, it's impossible to prove something doesn't exist. Second, people can and have downshifted into the wrong gear which sends the engine into an uncontrollable over rev.

 

my car will not go into first if im not at a stop i dont understand how people are doing this

the trans will not just accept any input you try and give, a misplaced downshift is caused by driver error and brute force

 

This^^ My car won't let you go from 5th to 2nd USUALLY at a certain speed unless a synchro is broken. Unless you use the almighty john force shift..... Maybe it's not supposed to do that then ...weird

Do it make a vid I'll give you a dollar

 

You are horribly, horribly confused. There is no over rev protection available in a manual shift transmission. Computer controlled sequential will prevent this in something like a GTR, since the ECU just won't let you downshift. In a true manual transmission, if you're at the top of third gear, and you accidentally grab second gear instead of fouth, kiss your motor goodbye. There is no "over rev protection". Just like everyone is telling you, the ECU has no way of taking your hand, and making you shift the **** out of the wrong gear. There is no fuel cut to help you. There is no ECU control to help you.

Short shifters will make money shifting EASIER to do. That's right. Got a short shifter? Higher chance of money shifting.

 

Good thing the dealer took care of you!

 

We already have a short shifter of sorts in stock form and I like it... that's why I never wanted an aftermarket one.

 

I can easily put mine in 1st coating very slowly...easy as pie.

 

Same. I do this all the time when I need to slow to a crawl. I do double clutch + heel/toe on the way down to be nice to my gearbox though.