I did some reading on this subject a while back, because I thought it was rubbish too, and while spitfire makes an exellent point (as he usually does) I believe in our particular car it has to do with how the transmission is setup. I should probably refresh my research on this before I post (I'll loook it up and edit) but It has something to do with that 4th and 6th are on the same syncro, or shaft, or maybe someone who understands the mechanics of the transmission can better explain. If your going to skip gears, at least double clutch...

 

Ill quote Turtle from another thread on this subject.

"4th to 6th isn't that good an idea on the S2000 gearbox. You're going to 'cruise mode' so what's an extra gear change?
5th and 6th share a syncro. There have been a couple (literally a couple - it's not common), of cases where there's been a problem so only 5th or 6th could be selected. It's more common from hard changes into 5th - but it's possible you could at the least weaken the syncro for the future. If you're planning on keeping the car a long time, either shift sequentially, or double de-clutch for a change like this. I'm categorically not saying your gearbox will lose a gear if you do this - but the 5th/6th gear syncros seem so far to be the weakest ones, so why tempt fate for a 'cruise' gear change?"

-Brian.

 

^ Which is also why 5th gear is hard to "bang". Anybody that's driven an AP1 past redline in 4th will tell you 5th is the hardest shift to do quickly and properly (unless you have an AP1 that grinds 2nd gear constantly for no apparent reason). JW, why do you consider 4th gear at 80mph a "mis-shift"? In my AP1 going 80mph I downshift to 3rd when I get on it. I don't go directly from 6th gear to 3rd, but as long as you gave it some gas when you let the clutch out you'll be fine. A "mis-shift" is, for example, going around a hard right-hand sweeper, you try to shift from 3rd to 4th at redline and accidentally hit 2nd gear and rev the motor past the rev-limiter. This is what causes cracked retainers, bent valves, etc.

 

thanks for all the responses

i didn't mean to go into fourth for a downshift peoples. i was going for sixth and went into fourth and popped the clutch for a eff me silly feeling afterwards.

does anyone know why my exhaust is a lot quieter now after that misshift? my 3-4k used to be beastly loud when i let off my gas pedal but now it's been reduced pretty significantly. could i have a leak somewhere in air pressure?

thanks in advance

 

I think your over analyzing it.... hard to hurt much mis shifting into 4th....

 

kinda off topic but has anyone else experienced exhausts getting quieter?

my exhaust was friggin loud when i first got it and now it's a little louder than stock?

 

It's not your exhaust, it's your hearing.

 

Wow, the paranoia of misshifting is kicking in.

To misshift you must put the car into the WRONG gear where RPMS > Redline.

 

mikegarrison

friggin hehe.

 

2 cars are running on an oval track, a black car and a red car.
Both run at a constant speed.
The black car (obviously ) runs faster.
At some point the black car is overtaking the red car.
2 scenario's:
#1 - the red car decides to go as fast as the black car.
During acceleration the red car will never drive faster then the black car.
As soon as the speeds match the red car will be behind the black car.

#2 - the red car decides to run besides the black car at the same speed.
During acceleration to match speeds and to catch up the distance between them the red car is driving faster then the black car.

Sceanrio 2 is not happening with the clutch, as the clutch slips and not made of gears that catch.
So I was wrong in thinking the engine would rev faster for a short while.

Acceleration times ARE different though.
How long does it take to rev a F20 from 3000 to 9000 rpm in neutral?
Half a second?
If during downshifting into a low gear at speed the engine revs up faster, in lets say a quarter second, but stays below redline, you're still putting more stress on several engine components IMO.

Not a mechanical over-rev but a mechanical over-acceleration.
Do it often enough and its just as bad IMO.