can't downshift from 3rd to 2nd

[yafayu]

My ae86 can't downshift from 3rd gear to 2nd unless it's low rpm(almost stop), i have droven 2 other old JP cars, 87 Nissan Pulsar, and 88 Celica, also couldn't get into 2nd from 3rd gear, is that a common problems for old JP cars?

cause there are lots fun to use 2nd gear..so should i rebuild it? or just get a used one?

[Flashmn]

sounds like a synchro problem, your options are to swap the tranny or open up the tranny and fix them. You could try Redline transmission oil, that might help, some people have reported them to help in tranny problems.

[4Aaron GE]

Also, while you're at it, start learning to double clutch. Your synchros will thank you.

[yafayu]

that's what the guy in shop said too! but why is that? whats different to use single and double chutch?

Originally Posted by 4Aaron GE

Also, while you're at it, start learning to double clutch. Your synchros will thank you.

[4Aaron GE]

By double clutching, you're doing what the synchro is supposed to do. Match the speed of the input and output shafts. If the synchros can't do it, you have to do it.

[lilmadafaka]

in what way doesnt it go in, do u feel it pushing ur shifter away or not, sometimes gear have problem going in when not enought pressure is being used, my friend had that prob, all u have to do is use a little strenght then, and yea this does happen to a lot of jap cars, mostly toyotas honds and nissans, i also heard of vw of havin that problems

[TekPhobia]

No, no double-clutching necessary. Most FWD Toyota gearboxes are constant synchromesh. You would double-clutch because the layshaft would not be moving and you'd have to clutch in, neutral...hit the gas to spin the layshaft up and clutch into the lower gear.

A better thing to do would be REV-MATCHING. Toot along in 3rd, clutch in, stab the gas, shift to 2nd and clutch out.

-Tim

[Flashmn]

rev matching wont help if your synchros are gone, which is most likely the case here.

[TekPhobia]

More chance of it working than, "Let's go watch the Fast and the Furious" double-clutching.

-Tim

[Flashmn]

Naah, double clutching works, because it matches the speed of the input and output shafts. Rev-matching doesnt do that. it only makes the engine spin more/less the same as the input shaft, so that it wont jerk when you lift your foot off the clutch. Rev-matching doesnt do anything regarding the gearbox and synchro operation.

[lilmadafaka]

Originally Posted by TekPhobia

More chance of it working than, "Let's go watch the Fast and the Furious" double-clutching.

-Tim

dude double clutching would work if u ever drove manual u would learn that if u double cluched, but no going to high in rpms, the gear would go in smoother

[Flashmn]

I've driven non synchro vehicles, you wont be able to get them in gear without double clutching, and when you grind the gears it hurts your hand alot!

[lex_addict]

try double clutching WITH rev matching

[AEugene86]

Originally Posted by TekPhobia

No, no double-clutching necessary. Most FWD Toyota gearboxes are constant synchromesh. You would double-clutch because the layshaft would not be moving and you'd have to clutch in, neutral...hit the gas to spin the layshaft up and clutch into the lower gear.

A better thing to do would be REV-MATCHING. Toot along in 3rd, clutch in, stab the gas, shift to 2nd and clutch out.

-Tim

first off all, the ae86 is RWD. second double clutching is an advance type of rev-matching. you do the same thing except inbetween say 3rd to 2nd you leave it in neutral, pop the clutch, rev-match, depress the clutch again, shift to 2nd and you should be able to pop the clutch into 2nd without bunnyhopping if you rev-match correctly.

I also suugest learning to heal-toe. for downshifting while breaking. If you get really good you'll be able to double clutch and heal-toe at the same time.

my buddies car wouldn't go to second. but it would if you double clutched.

[yafayu]

yup i did use some pressure to get into 2rd gear, but just it couldn't
btw, thanks guys i'll try double clutch and rev-matching

so here's all i should do
3rd gear(lets say 3000rpm) -> clutch in -> neutral -> get it gas to 3500-4000rpm -> clutch -> 2 gear
is it right?

Originally Posted by lilmadafaka

in what way doesnt it go in, do u feel it pushing ur shifter away or not, sometimes gear have problem going in when not enought pressure is being used, my friend had that prob, all u have to do is use a little strenght then, and yea this does happen to a lot of jap cars, mostly toyotas honds and nissans, i also heard of vw of havin that problems