Shift Secrets

[continuecrushing]

Guys, lets take it easy.

Just always start off in 6th gear, and the only time you need to shift is when you need reverse. Saves the syncro's IMO, ymmv

[Sport-Tech]

I've read about gear skipping (sorry can't remember the source), and it's actually more complex than just using rev-matching to compensate - even when you rev match is you are skipping gears you are still putting extra strain on the synchros. I saw the mechanical driveline diagrams that explained the reasons for this at the time, they were very clear, but couldn't recall the technical explanation now.

The takeaway was - if you want to skip a gear, it can be done without straining the synchros but only if you go through all the intervening gears while the clutch is kept in as this 'steps down' the speed differences the sychros have to deal with. So:

clutch in
2 -> 3
3-> 4
clutch out

[virobloc]

You can skip all the gears you want without straining the synchros at all if you double clutch properly.

[burnt toast]

Originally Posted by Sport-Tech

I've read about gear skipping (sorry can't remember the source), and it's actually more complex than just using rev-matching to compensate - even when you rev match is you are skipping gears you are still putting extra strain on the synchros. I saw the mechanical driveline diagrams that explained the reasons for this at the time, they were very clear, but couldn't recall the technical explanation now.

The takeaway was - if you want to skip a gear, it can be done without straining the synchros but only if you go through all the intervening gears while the clutch is kept in as this 'steps down' the speed differences the sychros have to deal with. So:

clutch in
2 -> 3
3-> 4
clutch out

Exactly what I came across on forums during my s2000 days. The frs/brz trans is pretty similiar to the s2000 trans, aisin az6 iirc.

[l0aded]

side question since we're talking about shifting. i give the engine a little bit of gas when upshifting (revmatch). I recently read that you're not supposed to revmatch at all during upshifts? is this true? how do you get a smooth shift without too much accel decel without revmatching it?

[Freetime]

All this talk about Rev matching and double clutching while daily driving is total bunk. It's thrown around by guys who think they are doing something special.
The synchros now negate all this crap. My MT toyota pickup is 19 years old. 160k miles, original clutch. I've never rev matched, double clutched, or blipped it. I spent years driving it like I stole it.

Drive your vehicle how ever you want, but don't act like you NEED to do any of that junk.

[Rayme]

Originally Posted by Freetime

All this talk about Rev matching and double clutching while daily driving is total bunk. It's thrown around by guys who think they are doing something special.
The synchros now negate all this crap. My MT toyota pickup is 19 years old. 160k miles, original clutch. I've never rev matched, double clutched, or blipped it. I spent years driving it like I stole it.

Drive your vehicle how ever you want, but don't act like you NEED to do any of that junk.

You don't need to do all that shit, but don't go and post crap about how it's stupid on public road.

Even been on the highway in 5th/6th and want to pass in 3rd? Double clutch and rev match like a king, it takes less than a second and the gear goes right it and it's just as smooth as an automatic.

[OrbitalEllipses]

Originally Posted by Freetime

All this talk about Rev matching and double clutching while daily driving is total bunk.

What, you want us granny shifting and not double clutching like we should?

[jmaryt]

Originally Posted by Freetime

All this talk about Rev matching and double clutching while daily driving is total bunk. It's thrown around by guys who think they are doing something special.
The synchros now negate all this crap. My MT toyota pickup is 19 years old. 160k miles, original clutch. I've never rev matched, double clutched, or blipped it. I spent years driving it like I stole it.

Drive your vehicle how ever you want, but don't act like you NEED to do any of that junk.

this is "dead nuts" accurate!

[jmaryt]

Originally Posted by Freetime

All this talk about Rev matching and double clutching while daily driving is total bunk. It's thrown around by guys who think they are doing something special.
The synchros now negate all this crap. My MT toyota pickup is 19 years old. 160k miles, original clutch. I've never rev matched, double clutched, or blipped it. I spent years driving it like I stole it.

Drive your vehicle how ever you want, but don't act like you NEED to do any of that junk.

synchros and "helical" cut gears eliminate double clutching,and rev matching. "older" trucks required ''double-clutching",AND rev matching because they were equipped with "conical" cut gears that would NOT mesh WITHOUT double clutching,and rev matching. example: "fuller road ranger" transmissions 15 speeds. (conical gear box) conical vs. helical is indicative of the "shape" of the gear teeth.

[jmaryt]

Originally Posted by ottopilot

You don't need to do all that shit, but don't go and post crap about how it's stupid on public road.

Even been on the highway in 5th/6th and want to pass in 3rd? Double clutch and rev match like a king, it takes less than a second and the gear goes right it and it's just as smooth as an automatic.

it's not stupid if you want to do it! it's your car! do what you want!

[MojoToot]

Originally Posted by l0aded

side question since we're talking about shifting. i give the engine a little bit of gas when upshifting (revmatch). I recently read that you're not supposed to revmatch at all during upshifts? is this true? how do you get a smooth shift without too much accel decel without revmatching it?

When you're upshifting, you are going from higher RPM to lower RPM. So no need to give it gas until letting clutch out. (unless maybe you are a super slow shifter).

Downshifting you are going from lower RPM to higher RPM so "revmatching" has a purpose here (although-as has been noted already-not "needed" when you have syncro')

[jmaryt]

as long as your shifts are smooth,there is no reason to rev match at all.now if ya want to,then that's different! i don't particularly get a charge out of it,as it's never a concern with me. modern trannies have eliminated the "need" to do it (as noted in previous posts)
although i have to admit to "double-clutching" all the time, a carryover from my truck driving days. tough habit to break...just sayin'

[FR-anco89]

Originally Posted by BlaineWasHere

What gap are you talking about? 4 lanes of freeway traffic moving 55-75 MPH and I have 100 feet from a dead stop at the meter lights. Some ramps have plenty of space after the meter lights but some have hardly any space like the one I get on every morning from my house.

If you read the whole post not just what you quoted it will answer your question. And the gap I'm referring to is the space in between cars when you merge into (assuming you're merging into another lane, if not then this post is irrelevant). You will not save gas skipping gears if your still flooring it, you're actually wasting gas the more you press the pedal not only what gear your on. You can't accelerate from 0-55/75 fast and be efficient. Sorry you need another car if that's what you want.