Just acquired my 2004 AP2 with 27,000 miles and while taking my brother for a short ride, I mis-shifted from from 3rd to 2nd, around 7.8k.

I've searched and read that it if I heard nothing immediately and car still feels and sounds fine, I'm ok.


One particular post from Billman250 says,

"AP2 is designed to withstand a one-gear mechanical over-rev.

You are fine.

Don't pull the valve cover, you wont find anything, I promise.

Benn posting this for 8 years."


Wanted to know other people's experiences as well, so take the poll and reply with the details!

 

I did a gear-grind the other night, worst sound ever but yeah everything was fine. I've also done a overrev when trying to pass a dump truck a while back. Instead of 4th to 5th gear I went 4-3 at around 8k No ill effects though.

 

You were shifting up, so grinding it a bit is no biggie. Worst things have happened

Billman is talking about money shifts, i.e. what Super Nintendo Chalmers did. That's when things get dicey, when the engine is reving high and you're getting it to go even higher by sticking in a lower gear. Then it's when you need to do checks etc, depending on the situation.

Mis-shifting up is nothing other than a grind.

 

Uh oh. Edited. I went from 3rd to 2nd. Not 2nd to 3rd.

 

Yes... I have mis-shifted in the past, and I have not seen any ill effects...

As soon as you hear the obvious signs of mis-shifting, your first gut reaction will be to immediately depress the clutch and fix the situation... So my guess is that it wasn't in the low gear for very long... I think you are going to be just fine...

 

I've shifted down instead of up before going at a considerable speed and I know it would have done considerable damage had I not engaged the clutch quickly.. I'd much more be worried about a downshift at speed by mistake than grinding shifting upwards. Lot less can go wrong on the second than the first. Just be aware of your surroundings so you can quickly engage the clutch ect when you notice there's a problem.

 

I over revved my AP1 at the track. Tried to go from 3rd to 4th at redline...foot flat on the gas pedal. Put it in 2nd by mistake.

Lots of smoke/misfire. Turned it off and back on....ran normal. Finished the track weekend because I'd rather blow it up than go home. This all happened 15mins into the weekend LOL.

It ran fine...but I had a cracked retainer. Swapped out for AP2 retainers and thought everything was fine.

A YEAR later...I got a misfire CEL while on the way back from a east coast trip. Decided to stop at the dragon. Ignored the f#&k out of the CEL. Got home and did a leakdown test. Had a lot of air blowing past intake and exhaust valves on cyl 4 :'(

Swapped another head on to it and it still runs great today, like 8000000 track days and road trips later.



You're fine. Just drive it. Do a compression test if you're worried. If any damage has been done, its been done already. Live your life anyway.

 

Agree, the mechanical overrev is the dangerous one.

I learned when I started HDPE in my old 911 that a shift is a 2 beat process ( out of one gear then into the next gear, with gentle pressure on the stick). Sounds slower but is just as fast and smoother(and less upsetting to the car) when you learn it.

If you macho shift like a bolt action you get no feedback until its too late.

With a gentle 2 beat shift you'll get resistance and engine sound that gives you the chance to recover.

my 2 cts

 

You were at 7800 rpm in 3d? I gotta check the gear ratios but you certainly would have exceeded 8000 in second. I assume the rev limiter activated?

I'd be interested in Billman's explanation.

-- Chuck

 

The rev limiter wouldn't matter in this case. The gear ratio is mechanically spinning the engine well past redline. Rev limit simply cuts fuel/ignition, so it only works when accelerating up to the redline.