Miss Shift, Missed form first to second, then Boom..

I am a new S ower and drive my S about 2 weeks. Today I was trying to shift form first to second, but i missed it. .. I guess i didn't fully enter the gear when I release the clutch. then i hear a very loud noise like Boom...! from the gearbox i guess. then I saw my gear was in neutral. I drived home later and didn't found any problem. I just wondering if this can damage the transmission.... how bad is it? Thanks Guys!

I was expecting a centerfold. Or at least a hydroplane boat.

You should not have any problem. The 1->2 shift is the most "notchy" on the S2000, and it takes some practice to learn how to do it.

Damaging misshifts are when you end up in a gear too low for your speed, not when you end up in neutral.

Thanks mikegarrison, I will practice more ..

Is the car used? If so, I would replace the transmission oil unless you know for sure that it was recently done. Old oil increases the problem of the 1->2 shift. But it's still the hardest shift to make in the car. 3->2 is the next hardest. For some reason, the design of the tranny seems to make 2 the hardest gear to mesh into.

I bought it certified in a honda dealer, I guess the transmission oil is OK, but i will still check it. thanks for the reminning

It just popped out of gear. Happened to me once.

It's screwed. Time for a new car. I'll take that old thing off your hands if you don't wanna be bothered taking it to the cuber.

^^

Yep, it was partially in gear and when you dropped the clutch the transmission literally kicked it back out. Makes a loud noise but you should be ok.

1-2 is the hardest shift cause the sychros have to do the most work. It drops 3000 rpms on that shift.

That almost makes sense, except it doesn't make any sense at all. If you are shifting at redline, it drops about 3000 RPMs on every shift.

Don't Assume... It's a cheap and easy thing to do, get honda's MTF fluid (2 quarts) and change the fluiid. While your at it, get some good gear oil too (GL-5 rating)

Not true. Try shifting at redline 2-3, 3-4, 4-5, 5-6 . Each gear gets higher an higher.

Edit- Each gear the RPM change decreases.

Did you notice the "race stripped" part on the description of my car? I pretty much never shift it except at redline, because it's not a daily driver.

Your explanation is bogus, IMO.

There is some reason why getting into 2 is the hardest gear in this box, but the gear ratio between 1 and 2 is not it.

In my experience, the next hardest shift to make is going into 2 in the other direction, from 3.

First gear ratio = 1:3.133
Sec gear ratio = 1:2.045
3rd gear ratio = 1:1.481
Both for AP1 and AP2

When shifting 1-2 in a split second (ie, without any speed loss at all = impossible) the difference is 3125 rpm.
The 2-3 shift has a 2483 rpm difference.
A super fast 3-2 shift below 6517 rpm will have a difference of the same 2483 revs, only now the revs rise

I never miss a shift unless I call out of work first.

I can care less if you car is race stripped. And yes I did read that before I posted and thought "wow, I would think a track guy would know better to say something stupid like that?"

So when you are at 5000rpms in 5th and shift to 6th your car drops to 2000 rpms? Obviously Honda would not have geared the car that way.

Go take your car to redline in 4th and 5th and show me a video of it falling to 6000rpms.

Now I do not know what exactly makes the 1-2, 2-3 shift the most notchiest but many well-respected members including Xviper pointed to the very fact I made in my original post. Also the 1-2 shift is going to be the most common shift therefore putting that much more wear on the synchros.

Just watch this vid and you will see that with every shift the rpms drop less and less.
http://videos.streetfire.net/video/S2000-speedo_89953.htm

I could show you my video to but realize I have 4.57s but even so the rpms drop less and less with each shift.
http://videos.streetfire.net/video/S2000-w...7psi_171650.htm

thanks for the numbers..a difference of what about 650 rpms?

Hey be carefull with those misshifts cause it happened to me 2 but i blow my second gear But i took it to honda and they rebuilt my tranny free of charge

Did I say that? No. I said that if you shift *at redline* then it drops about 3000 rpms. Is redline 5000 rpm on your car? Because it's not on mine.

However, checking the easily available "gearing calculator" at Turnzero does show ideal redline shifts getting smaller at every gear. Which isn't what it seems like, but I guess must be true.

I tend to doubt it is the reason for this being the issue, however, but I'll now grant it wasn't as unreasonable a claim as I first thought.

Here's a video with RPM shown. And yes, even though it's my own video on my own car, I'm offering it as evidence that I was wrong about the shifts dropping the speed 3000 RPM.

http://www.eskimo.com/~mikeg/videos/080618_Alfa_evospin.wmv

Nice vid. IMO I think it may very well be the reason because the majority of grinds are when you shift fast. If you shift a little slower it seems to go in without a hitch.

Most of those shift were around 8400-8600 rpms or less. Probably because you cant take your eyes of the line. Even so you were dropping to around 7k each shift.

I have this problem, for example when i turn my car , put it in first and ready for a slow and steady takeoff, as i start to drive the gear pop out and i hear a big thump!!!... It happens quite often now. Recently when im in first gear, I have to hold down the shifter at first so it won't pop out of place and then when i switched gears im good to go. It seems like my first gear doesn't stay in place.

Mine pops out of 2nd and 3rd sometimes when RPMs drop.. strange

If my car dropped 3k on EVERY shift I would have donated it to charity by now....

9kFever Posted on Jul 17 2008, 02:18 AM

I made that same mistake too, one time.
But it isn't so.


Your total ratio per gear has changed, the total ratio being from crankshaft to wheel.
But the difference between the gears has not changed.
The rev drop is the same, just at a different road speed.


A 1-2 shift will have a rev drop of 3125 rpm.
In real life it will be more because the moment you disconnect the engine from the gearbox your car will slow down, pure physics.
There is no mysterious inertia or hidden force to keep accelerating your car when the engine is not doing it.
Unless you're driving downhill, it has to be pretty steep though to accelerate the car at the end of 1st
The syngro had to deal with the 3125 rpm. if you shift very fast.

Why don't you notice it being 3125 rpm or so?
Because when letting the clutch out after the 1-2 shift one's also "giving gas" to match engine revs to gearbox so the clutch disk (gearbox) is connected to an engine (the flywheel and PP) that's spinning a bit faster than the disk, the FW & PP grab it and accelerate it, as if your revdrop is only 2800 rpm.