Overrev 2nd@redline into 1st

D

dietdrk

Member
Well,

Out tooling around yesterday i tried to go from 2nd into 3rd. Of course the stupid thing is locked out (have recalled mount, and new brushigs) but anyway, i slip i guess and into first. let off the clutch and waaaamamamama

Car dives back down to lower speed.

It seems to act fine. I have been driving it since then (this happened sunday) and everything appears good with it.

I'm hesitant to take it to the dealer and tell them what happened. Im thinking about taking it to a local shop and seeing if they can take a kinda look at it, just for my peice of mind.

should i be worried?
Does this thing has a black box to tell them this has happend if i have problems 20k from now?


(2k ms3)
 
You shouldn't have anything to worry about as long as it's not too often. Many people have done the same thing with little consequence.

How are you holding the shifter? Try using your palm to nudge it into 3rd. It should just fall into place.
 
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Yeah I believe rpms can be recorded but they usually don't go digging up that info unless they have reason to suspect abuse. Mistakes do happen. Plus I really don't know the length of time that data stays recorded. From what I gather about the airbag black box, is they record a certain amount of seconds before (and after?) a crash.

Here's an article on the black box:
http://money.cnn.com/2006/08/22/autos/edr_concerns/index.htm
 
You need to get a compression and leakdown test. If you were getting on it you could very well have bent a valve or damaged the valvetrain in some way. A little valve bend may not be noticeable on the butt dyno butt could lead to major issues down the road. It shouldn't be that expensive to get it done and will give you peace of mind.
 
Nothing to worry about? I disagree. That's a mechanical overrev. There's lots of things to worry about in my opinion and it only takes one time. All depends on how strong the top end is, but you can bend valves and/or crack retainers. If you had a bent valve, you'd probably know already, but a cracked retainer may hang on for a while and not rear its ugly head until later on when it fails altogether and drops a valve down into a cylinder. I'm guessing you were somewhere around 7,500 RPM, but it's not really the RPM as much as the rate of change in RPM that damages the motor. I believe the ECU will store max RPM. For how long? I don't know. Sorry to scare you, but this happened to quite a few people in the S2000 forums when I owned one and even in a car designed to rev to 9,000 RPM, they'd find cracked retainers after mechanical overrevs. The only way to really tell is to pop the valve cover and inspect the top end, but that is a lot of work. You are kinda rolling the dice though continuing to drive it. I can't believe you got the thing into 1st gear at 6,000 RPM in 2nd.
 
yea ive hard horror storesi from a friend about moneyshifting.

Just wondering how much i have to worry about in this car.

Migh ttake it to get a compression test tomorrow see what they say.
 
dietdrk said:
yea ive hard horror storesi from a friend about moneyshifting.

Just wondering how much i have to worry about in this car.

Migh ttake it to get a compression test tomorrow see what they say.
Click to expand...

RPMS matter but imo, the extent of damage depends on how fast you were going and what gears it occurred in. 2-1 isn't nearly as bad 4-1, 5-2 or 6-3 (like at highway speeds). I think the compression test is a good idea. But I wouldn't lose too much sleep over it unless you start smoking or there are obvious problems. If you suspect something or hear anything strange take it in (but remove any mods).

One member over on one the other forums autocrossed his car and shifted into first several times and so far have had no issues. Of course it's all at low speeds and usually 2nd to first. Also, it doesn't mean you won't have an issue because he didn't.
 
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This brings up a good question, are these engines interference or non-interference engines? With a timing chain instead of a belt I have to believe it's an interference design, so nice with my 92 Miata to not have to worry about bending valves if the timing belt snaps.
 
User Name said:
This brings up a good question, are these engines interference or non-interference engines? With a timing chain instead of a belt I have to believe it's an interference design, so nice with my 92 Miata to not have to worry about bending valves if the timing belt snaps.
Click to expand...


i guess its not always true, i snapped my timing belt in my civic and it bent 4 valves. I didn't even miss shift ... i was going from 4th to 3rd and it just snapped. Found out after it some cheap china belt the original owner put in.
 
A compression test obviously won't hurt, but again, if you've got a damaged valve retainer, ie: stress cracks from an overrev, a compression test is not going to show that, but you will definitely know it when one lets go. The retainer is all that's keeping the valve from dropping down into the cylinder and I imagine if that happened, there'd be some "interference". :D
 
dietdrk said:
is it true about the black box?

I was at 6k in 2nd what does that translate into in 1st?
Click to expand...

No offense but this does not happen on occasion. If it does you need a driving lesson. Your poor car man. Lock out is 6k RPM in second going to 1st. You would have had to CRAM that into gear in order to get it to go and it had to make a lot of noise getting there. Incredible. You didnt go through the windshield or hit your steering wheel? Wow... 3rd is not that hard of a shift even when stock. Sorry for going off but the more I read this the more I got over whelmed that this even happens.
 
1.6L and 1.8L Miata engines are non-interference... MZR engine is!!!

I wouldn't worry...besides, your car is still under warranty...if anything breaks later on, just take it in and act stupid.

I still don't understand how you got it into 1st...you must have really nailed that sucker into 1st. My 1st gear locks me out as soon as I'm in 2nd.
 
mazdaspeedster3 said:
No offense but this does not happen on occasion. If it does you need a driving lesson. Your poor car man. Lock out is 6k RPM in second going to 1st. You would have had to CRAM that into gear in order to get it to go and it had to make a lot of noise getting there. Incredible. You didnt go through the windshield or hit your steering wheel? Wow... 3rd is not that hard of a shift even when stock. Sorry for going off but the more I read this the more I got over whelmed that this even happens.
Click to expand...

Your avatar is a perfect expression for your response.
 
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