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Old 09-15-2005, 08:40 PM   #1
SubyDan05
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Default Possibility of going over the rev limiter?

I was at the track the other night, and i was in 3rd gear going to shift into 4th, and I went into 2nd. It made a horrible noise, but it was probably just bouncing off the limiter, but I could have swarn I saw the tach barried. While this was happening the check engine light came on. Later I found out that this was a misfire code. It runs fine now, I was just wondering if i could have gone over the stock limiter, and did any damage. Let me know what you guys think.
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Old 09-15-2005, 08:59 PM   #2
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The rev limiter functions by cutting fuel. It will limit rev's only induced by the engine being accelerated via the *gas pedal*, but it *can't* limit revs induced by downshifting into a lower gear, at too high a speed---those revs are being mechanically driven by rotation of the drivetrain, from the rotation of the tires, yadda yadda.

You could have easily exceeded the redline, by downshifting into the wrong gear.

I'd get the CEL code(s) pulled and take it from there. Some of the more experienced folks may have some specific suggestions on things to look at.
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Old 09-15-2005, 10:59 PM   #3
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I'd say you got really lucky your engine didn't go boom!

Typically missed shifts like that end up with alot of engine internals on the road.
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Old 09-15-2005, 11:21 PM   #4
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Quote:
Originally Posted by subbyspeed
I'd say you got really lucky your engine didn't go boom!

Typically missed shifts like that end up with alot of engine internals on the road.

naw, i missed a 5th->4th downshift @ like 75mph, ended up into 2nd (how synchros let it go into second that easily, i'll never know)...hit like 8000rpm on the tach for a second.

car bucked like a mofo. instant clutch-in, and went to 4th, followed by the slapping of one's self.


no permanent damage done.
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Old 09-15-2005, 11:29 PM   #5
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I sent my version 7 motor to about 9.5k once. No CELs or any bad signs. I crapped my pants but it sounded pretty sweet to tell the truth.

Last edited by Capt Crunch; 09-16-2005 at 12:51 AM.
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Old 09-15-2005, 11:35 PM   #6
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I was redlining 3rd @ ~90 or so, and somehow managed to misshift into second instead of fourth, tac flew, engine roared, and I **** my pants. Everything is fine though, doesn't seem like anything was affected. Scared the hell out of me.
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Old 09-15-2005, 11:38 PM   #7
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Seems the trend is after a misshift, the pants become soiled . I know mine would...
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Old 09-15-2005, 11:39 PM   #8
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same thing happened to me a year or so back. top of third into second is like 9k... i felt bad for like a week after i did it.
more than 30k miles and lots of boost later, the motor is fine.
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Old 09-16-2005, 07:12 AM   #9
SubyDan05
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so there is no limiter on the downshift huh?
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Old 09-16-2005, 08:04 AM   #10
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^^^ Read much ... No there isn't any such limiter ...
Quote:
Originally Posted by WRXRgr
The rev limiter functions by cutting fuel. It will limit rev's only induced by the engine being accelerated via the *gas pedal*, but it *can't* limit revs induced by downshifting into a lower gear, at too high a speed---those revs are being mechanically driven by rotation of the drivetrain, from the rotation of the tires, yadda yadda.
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Old 09-16-2005, 08:23 AM   #11
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Quote:
Originally Posted by SubyDan05
so there is no limiter on the downshift huh?
We (the nuts that hold the steering wheel) are the downshift rev limiters.
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Old 09-16-2005, 11:24 AM   #12
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wow, i am really impressed and happy that our cars have such great valvetrain and engine balance that none of you have reported anything going boom. Most honda valvetrains are tweaked out by 500 rpms past there rev limit (granted there limit is quite high to begin with) and fail everytime.
Makes me wonder if we share the same valvetrain as the JDM sti...

Anyways, great to hear. Just another reason why our cars kick ass
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Old 09-16-2005, 01:32 PM   #13
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Quote:
Originally Posted by SubyDan05
so there is no limiter on the downshift huh?
Synchros, your hand... that's about it. I don't think it would be a probably with a short shifter, but with the stock one I could see myself doing a 3-2 instead of a 3-4 in a corner. Although... I'm usually not redling 3rd.
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Old 09-16-2005, 07:34 PM   #14
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I am answering my own question here. I talked to a few techs at work today and they said that it is impossible to go over the limiter. The limiter is throught the fuel and ignition. The computer stops the rpms at a certain point, at anytime. When you see the tach so high around 8-9k its just the tach needle bouncing that high.
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Old 09-16-2005, 07:52 PM   #15
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Quote:
Originally Posted by SubyDan05
so there is no limiter on the downshift huh?
Physics > Electronics
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Old 09-16-2005, 07:55 PM   #16
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Quote:
Originally Posted by SubyDan05
I am answering my own question here. I talked to a few techs at work today and they said that it is impossible to go over the limiter. The limiter is throught the fuel and ignition. The computer stops the rpms at a certain point, at anytime. When you see the tach so high around 8-9k its just the tach needle bouncing that high.
Nevermind, thats that dumbest thing I've ever heard

Last edited by REX8; 09-16-2005 at 09:06 PM.
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Old 09-16-2005, 07:56 PM   #17
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hence "mechanical over-rev"...
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Old 09-16-2005, 08:17 PM   #18
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Quote:
Originally Posted by SubyDan05
I am answering my own question here. I talked to a few techs at work today and they said that it is impossible to go over the limiter. The limiter is throught the fuel and ignition. The computer stops the rpms at a certain point, at anytime. When you see the tach so high around 8-9k its just the tach needle bouncing that high.

Yeah, they're wrong.

Or you asked the question wrong.

It is impossible to stop a motor from revving itself over the limit if you put it in the wrong gear at the wrong time.

2nd is geared to slightly over 60, so if you put it in second at 75 mph, the tires and the rest of the drivetrain will attempt to accelerate the motor, and there isn't any fuel or spark cutting that will stop it. At that point in time it is mechanical, not chemical energy, spinning the motor.


This has all been explained above I know, just thought I would rehash.
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Old 09-16-2005, 08:48 PM   #19
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my friend went from 3 to 2nd (in a wrx), couple thousands miles later it blew up.
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