Hi all,
I looked at a car last night and when the car goes from 3rd to second and you are going to fast it doesent want to change back and makes a weird noise.
Is this something to be very concerned about?
Synchro problem?
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| Problem going from 3rd to 2nd? https://www.ausmini.com/forums/viewtopic.php?f=2&t=47947 |
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| Author: | stevos [ Thu Nov 27, 2008 7:50 am ] |
| Post subject: | Problem going from 3rd to 2nd? |
Hi all, I looked at a car last night and when the car goes from 3rd to second and you are going to fast it doesent want to change back and makes a weird noise. Is this something to be very concerned about? Synchro problem?
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| Author: | Lillee [ Thu Nov 27, 2008 7:58 am ] |
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Well you shouldn't really be trying to get into second while doing high RPM in third... Yes it could be about the synchros as it is trying to spin up 2nd to match the speed of your engine but it's not designed to do this at super high speed or with any sort of racecar efficiency. Say if you are over 3000rpm or more on third, changing into second, you'd be doing well over 4500rpm which is far too quick to shift back into without dammage/wear on the synchros... Safest alternative if you must do it is to double clutch. Have a search about that and start practicing... |
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| Author: | stevos [ Thu Nov 27, 2008 8:05 am ] |
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woops 
meant changing between those two gears too quickly as in you need to take your time getting the gear accross the 2nd from 3rd what would need to be done about it? how much etc? thanks 
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| Author: | simon k [ Thu Nov 27, 2008 8:57 am ] |
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yeah, worn out 2rd gear synchro - it's a gearbox rebuild job, so save up, and learn to double clutch until you have around $1500(*) briefly... clutch in out of 3rd gear clutch out blip throttle clutch in in to 2nd gear clutch out it sounds cumbersome, but it becomes natural quite quickly. Try youtube, someone will have put up videos of people doing it (*) before someone jumps up and down and says a gearbox rebuild costs less than $1500, I've said that figure as a rough high-ish estimate based on - he can't do it himself, so needs someone to pull the motor, split it, do the box & reassemble - the other parts required are unknown - cos I f*cking said so |
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| Author: | Mini Mad [ Thu Nov 27, 2008 9:12 am ] |
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simon k wrote: - cos I f*cking said so[/size]
word. |
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| Author: | Matt68 [ Thu Nov 27, 2008 10:21 am ] |
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simon k wrote: before someone jumps up and down and says a gearbox rebuild costs less than $1500, I've said that figure as a rough high-ish estimate based on - he can't do it himself, so needs someone to pull the motor, split it, do the box & reassemble - the other parts required are unknown - cos I f*cking said so My gearbox rebuild (with diff and Hardy spicers) came in at over $2500.00 (Bloody cooper s tax, parts cost more than the labour!) and that involved no stripping off the block! So the costs can be quite high. My box still worked, slight crunch on changes if you weren't sympathetic, but it worked. Take it apart and it was completely shot! go figure 
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| Author: | Lillee [ Thu Nov 27, 2008 10:22 am ] |
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is it a problem with getting into second full stop or just when coming from 3rd to second? If you have problems going from 1st to second as well then it is definately a synchro issue, it is totally busted, start saving. If it's only happenning from 3rd to 2nd then see my earlier post. ie. You shouldn't really be doing this too often! my gearbox is brand new with brand new synchros and it's still difficult to do this at high speed without double clutching. Doing it with worn synchros is definately going to be harder... It's not designed for this sort of shifting. Bringing your engine from low RPM to higher RPM via gears is a general NO NO... it flexes cranks, introcude gearbox stresses bla bla. Just take off in 3rd or double clutch. Either way it sounds like the synchro is on it's way out |
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| Author: | stevos [ Thu Nov 27, 2008 11:40 am ] |
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Lillee wrote: is it a problem with getting into second full stop or just when coming from 3rd to second?
It's only when you go from 3rd to 2nd fast you can avoid it just going real slow between the gears? this is starting to sound expensive  lol
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| Author: | lilmatti_69 [ Thu Nov 27, 2008 11:43 am ] |
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Yea when your going to fast in 3rd gear it makes a sort of grinding noise when downshifting into 2nd gear, mine does it aswell some times. If you slow down to a certain speed or rpm then it wont do it anymore, unless ofcourse it does it no matter what speed your going
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| Author: | stevos [ Thu Nov 27, 2008 11:49 am ] |
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fast is in shifting the gear down into second not as in RPM 
am i confusing you yet? |
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| Author: | jess [ Thu Nov 27, 2008 11:55 am ] |
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stevos wrote: fast is in shifting the gear down into second not as in RPM
am i confusing you yet? Yes (but i'm a redhead so that's not hard )
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