Double Clutch - Bringing the clutch up in neutral during a shift. Double clutching is not really necessary in modern synchromesh cars but it can make things smoother and is fun. You are basically not only rev-matching the engine to the clutch, but also the input shaft to the output shaft between gears, doing the job of the synchros. For a double clutch downshift: clutch in, shift gear to neutral, clutch out, blip throttle (this is the rev-match for the input shaft to the output shaft), clutch in, shift neutral to lower gear, clutch up. If you do it fast enough the one blip in neutral is enough. If the revs fall too fast you can give a smaller 2nd blip before clutching up. Cars without synchromesh gearboxes require this maneuver. Double clutching is also useful for downshifting into 1st as many cars do not have synchros or have weak synchros on 1st gear.

http://standardshift.com/forum/viewtopic.php?t=3573

 

ok then, well iment likek being in third, then putting in nutral, then getting to the normal speed i would need to be at in second anyways to be in second then shiftin, that's how he made it seem is all, but nice explination

 

yeah i just got my tC right befor thanksgiving and then after a while of driving it 3rd would go in smothly it wouls syop short then go in and it would grind sometimes. so i took it to svion and have them drive and they said somthing was defintly wrong but they wernt sure what so i ended up getting a new tranny ... FOR FREEE : )

 

What year car do you have? (This sounds like a lubrication problem with the syncros, which could result in an expensive repair a few years down the road.)

 

mine is an 06 model.

 

The only time my gears are a little sticky is when i am at a dead stop and putting it in reverse, which i have found common with standard transmission and does not happen all the time. I sure hope you you figure this out though and that it doesn't happen to me, i have 35 thousand miles and i will be paying out the ___ for that one if it does.

 

well... the bright side is (if there is one), we won't be paying "out of butt" like people who own problematic autos

 

Maybe the problem with our 2nd gear is that the ratio difference between 1st and 2nd gear is just a bit too big, and we're forcing the syncros to work extra harder. I would bet you would get the same noise from 1st if you would try to single clutch downshift into it. I have noticed that this doesn't happen when I downshift from 3rd to 2nd, even if it's cold. Also if you try to shift a bit slower into 2nd, at least when the car is cold, it doesn't make the noise.

 

I've been experiencing the same problem most of you have shifting from 1st to 2nd, feels like a small grind into 2nd gear every morning or whenever the car is parked for 5-6 hours. Brought my car to the local dealership where my tC was purchased at "Longo Toyota" more than 5 times, even left overnight once, I get a reply "everything is normal / no grinds". I drive off hoping it would be the last, but never. They offered me to schedule with a Scion Rep. which I believe he/she comes once a week on a specific day to that dealer, but I havent got around to that with my work schedule. What is the warranty on our tranny? (Sorry, too lazy to look up) My plan is to get it in once more to have them check it out and ask the service manager to put the problem in writing just in case the tranny breaks down one day because of this problem...what do you guys think?

 

That was going to be my suggestion. Take the car in to the dealer, and keep records of it. I doubt you'll be able to get anything from them in writing, but it wouldn't hurt to mail Scion a letter and see if they'll respond. If one or more of the syncros die in the future, you should still be covered since the problem first manifested itself while the car was under warranty.

 

my fifth gear seems fine actually...i have an 07btw ...but i do get the ocassional second gear "grind" on a cold start.

wiggling the shifter in neutral is bad for the synchros?...its a habit i must stop

 

hmm... I don't know about this one. Side-to-side wiggling really wouldn't do anything, because you're not engaging any of the synchros. I'll have to question that statement.

AFAIK it's perfectly fine.

 

Mine was doing the same thing, but i found a way around it. It always happened to me because i just slid 4th up and hit 5th. But almost everytime, i would get this sticking feeling. The cure for me is to push the shifter to the far right (not with force) as far right as it will go with applying hard pressure and then push up. It now slides in perfectly everytime.

To summarize...

DO NOT push the gear forward out of 4th and let the tracks slide it into 5th.

DO push the shifter forward out of 4th stop at neutral, turn right, stop at end of travel, THEN push forward into 5th. Sounds a little drawn out and time consuming but its not, it very smooth and effortless after you get used to it. And don't double clutch.

 

i used to do that too tcizzler but i still had problems. i tried the double clutching action and it seemed to help. when in 4th i press down the clutch, shift to neutral, depress the clutch. then press down the clutch again, push the shifter all the way to the right and then press up into 5th. it went in smooth when done like this.

 

pay attention to this poster, shade of brilliance

 

pwned by the double post

 

you should not have to double clutch with the tc. if so, your tranny is fdup.

imo, the problem isn't the gearing (which comes right from a camry)...its the final drive (differential) and clutch/DBW combo.

makes feeling out the throttle and matching revs a pain sometimes. plus, revs drop pretty quick while shifting.

its doable though. I used to complain about the setup more than anyone, and though it still gives me fits sometimes...i've gotten used to it. The throttle delay means you have to hesitate letting the clutch out more than you would on another car. hope that helps.

 

my car has the same exact problems....toyota went cheap on da trannys im guessing cause it goes into 5th rough at higher speeds and smooth and lower speeds. sameee problem with second gear......my tranny went bad the first few months i had the car...3rd gear synchro went bad and they replaced it.....GOOD JOB _______S! i just need a whole new tranny!

 

apparently the problem with mine was caused by hotspots on my flywheel.... and that my clutch has had heavy wear... they wont cover it and said that its due to my driving... i may buy that, but it still seems like weak tranny / clutch

 

since our motor and tranny is the same as a camrys i wonder if the camry owners have this same problem. i would love to hear some response from camry owners.