Pimm Junior Posted September 13, 2015 Share Posted September 13, 2015 Bought my Z 2 months ago and had fluids changed since then Iv covered just over 4K miles and my gears are getting really tough? Anything to worry about or...? Also while Iv got your attention how often would you do an oil change? Currently at 98K miles changed last at 93.6K Cheers all Quote Link to comment Share on other sites More sharing options...
Mikevv Posted September 13, 2015 Share Posted September 13, 2015 I'm having a similar problem and would be interested to see what they make of it. I always thought it was me being an idiot and changing gears "wrong" Always struggled with 2nd for some reason, just an unnatural motion on my wrist. Now if it was LHD.... hehe Quote Link to comment Share on other sites More sharing options...
spursmaddave Posted September 13, 2015 Share Posted September 13, 2015 1st > 2nd was always sticky in my 350 when it was cold but once it had warmed up was fine, I had some additive put into the gearbox oil called molyslip I think which helped Sent from my iPhone using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
marzman Posted September 13, 2015 Share Posted September 13, 2015 Zed gearboxes are very quirky to say the least. I always struggled with 2nd to 3rd. As SMD says above, get some Molyslip added and do a gearbox fluid change. May or may not improve things (didnt for me, but when i dropped the gearbox oil it looked like new anyway so the previous owner to me had obviously done it recently). In the end I settled on double de-clutching on every 2nd>3rd gear change. i.e. Clutch in 2nd>neutral Clutch out Clutch in Neutral>3rd Clutch out The eliminates any notchy/clunkyness. Annoying at first, but now, 4 years on, muscle memory causes me to still do this in most other cars i've drive. Quote Link to comment Share on other sites More sharing options...
Pimm Junior Posted September 13, 2015 Author Share Posted September 13, 2015 Okay I'll look into that molyslip stuff Also had crunching issues with 6th since day 1 of owning it but if I'm gentle it's okay haha Quote Link to comment Share on other sites More sharing options...
cmck13 Posted September 13, 2015 Share Posted September 13, 2015 Double clutching, used be the norm before we got synchronised mesh ask anyone who had a car after the war. Quote Link to comment Share on other sites More sharing options...
HiddenWomble Posted September 13, 2015 Share Posted September 13, 2015 Zed gearboxes are very quirky to say the least. I always struggled with 2nd to 3rd. As SMD says above, get some Molyslip added and do a gearbox fluid change. May or may not improve things (didnt for me, but when i dropped the gearbox oil it looked like new anyway so the previous owner to me had obviously done it recently). In the end I settled on double de-clutching on every 2nd>3rd gear change. i.e. Clutch in 2nd>neutral Clutch out Clutch in Neutral>3rd Clutch out The eliminates any notchy/clunkyness. Annoying at first, but now, 4 years on, muscle memory causes me to still do this in most other cars i've drive. was rev matching not enough? i'm in the habit of trying to rev match while changing gears. means less strain on the sync and faster gear changes. but a double de-clutch is the momma of all gear change manoeuvres Quote Link to comment Share on other sites More sharing options...
Juggalo Posted September 13, 2015 Share Posted September 13, 2015 Got this myself in 2nd. Not so bad when hot. From extensive research, it seems to be because the syncros are made of cheese, and lose teeth. Tried molyslip and it didn't work. In the end I drained a litre of oil out of the box and put a litre of 5w30 in which helped a lot, also quietened the box. I'm rebuilding the gearbox next spring so I'll post pics of the old syncros when the time comes. Quote Link to comment Share on other sites More sharing options...
ricochet Posted September 25, 2015 Share Posted September 25, 2015 I find 1st to 2nd is very chunky/notchy/slow, so much that I pull away from 2nd when appropriate. and the g/box oil has been changed. jc Quote Link to comment Share on other sites More sharing options...
Puffmac Posted September 26, 2015 Share Posted September 26, 2015 Zed gearboxes are very quirky to say the least. I always struggled with 2nd to 3rd. As SMD says above, get some Molyslip added and do a gearbox fluid change. May or may not improve things (didnt for me, but when i dropped the gearbox oil it looked like new anyway so the previous owner to me had obviously done it recently). In the end I settled on double de-clutching on every 2nd>3rd gear change. i.e. Clutch in 2nd>neutral Clutch out Clutch in Neutral>3rd Clutch out The eliminates any notchy/clunkyness. Annoying at first, but now, 4 years on, muscle memory causes me to still do this in most other cars i've drive. was rev matching not enough? i'm in the habit of trying to rev match while changing gears. means less strain on the sync and faster gear changes. but a double de-clutch is the momma of all gear change manoeuvres If by rev matching you mean "blipping" the throttle when the clutch is depressed before bringing it back up then that's only half the story. In doing so, you're only setting the engine speed to the correct speed for the gear you're selecting (which will still stop the car lurching when you re-engage the clutch). However, because the clutch is still disengaged, the input side of the gearbox isn't speeding up with the engine, which means the synchros will still have to do all the work to speed up the input side of the gearbox to match the output side as you press the gearstick into gear. When double declutching, you dip the clutch, put the car in neutral and then bring the clutch up again. Then either "blip" the throttle to speed up the engine and gearbox for a downshift, or let the revs drop for an upshift. Doing this, you are matching the input gears to the speed of the output gears, allowing them to mesh easily. Finally, press the clutch in and select the gear. This is all done in one quick action in practise, and can be completed in the same time as a normal gear change by an experience driver. Synchronisers were devised to remove the requirement to do this, but doing so can make for much smoother shifts and educes synchro wear, particularly on the bigger downshifts (6th to 3rd for example). Also a vital skill if synchros are fecked . 1 Quote Link to comment Share on other sites More sharing options...
HiddenWomble Posted September 29, 2015 Share Posted September 29, 2015 (edited) was rev matching not enough? i'm in the habit of trying to rev match while changing gears. means less strain on the sync and faster gear changes. but a double de-clutch is the momma of all gear change manoeuvres If by rev matching you mean "blipping" the throttle when the clutch is depressed before bringing it back up then that's only half the story. In doing so, you're only setting the engine speed to the correct speed for the gear you're selecting (which will still stop the car lurching when you re-engage the clutch). However, because the clutch is still disengaged, the input side of the gearbox isn't speeding up with the engine, which means the synchros will still have to do all the work to speed up the input side of the gearbox to match the output side as you press the gearstick into gear. When double declutching, you dip the clutch, put the car in neutral and then bring the clutch up again. Then either "blip" the throttle to speed up the engine and gearbox for a downshift, or let the revs drop for an upshift. Doing this, you are matching the input gears to the speed of the output gears, allowing them to mesh easily. Finally, press the clutch in and select the gear. This is all done in one quick action in practise, and can be completed in the same time as a normal gear change by an experience driver. Synchronisers were devised to remove the requirement to do this, but doing so can make for much smoother shifts and educes synchro wear, particularly on the bigger downshifts (6th to 3rd for example). Also a vital skill if synchros are fecked . Thanks for the extra info Edited September 29, 2015 by HiddenWomble Quote Link to comment Share on other sites More sharing options...
Keyser Posted September 29, 2015 Share Posted September 29, 2015 Double clutching, used be the norm before we got synchronised mesh ask anyone who had a car after the war. Most of us had cars after the war I want to ask anyone that had a car before the war I started on tractors - they were just nuts to change gear on Quote Link to comment Share on other sites More sharing options...
Sargara Posted September 29, 2015 Share Posted September 29, 2015 Standing starts are a pain, makes the car seem sluggish because you cant smoothly transition through the cars but its just a quirk of 350 ownership Quote Link to comment Share on other sites More sharing options...
rabbitstew Posted September 29, 2015 Share Posted September 29, 2015 My HR used to always be a bit knotchy from 1st to 2nd when cold, but once warmed up was fine. The car had only done 20k miles and the general concensus was that its a "feature" of zeds. Quote Link to comment Share on other sites More sharing options...
Kraziekatz1 Posted September 29, 2015 Share Posted September 29, 2015 Really? A zed trait? Never noticed an issue on mine. Just had to take it for a quick spin to check, and nope....super smooth gear changes. 1st to 2nd glides straight in Quote Link to comment Share on other sites More sharing options...
Selah83 Posted September 30, 2015 Share Posted September 30, 2015 You should try 1st, 2nd & 3rd gear in a Zed Keyser built.. I need a hammer to get it in! Quote Link to comment Share on other sites More sharing options...
DarmoZ Posted September 30, 2015 Share Posted September 30, 2015 My first Zed that I eventually wrote off, was terrible 1st to 2nd shift. My next one was OK, I changed to nissan gear box oil with molyslip, no immediate effect but after 2 weeks it's nice and smooth, even improved at cold. Not as smooth as my ford focus but as good as it gets for a 350z i think (I can slot it in 2nd with just my fingers, even on cold.) I do Rev match for smooth changes when accelerating, and because my biting point is very low, gently lift the clutch up. I'm not old school enough to have the patience for the double de clutch method, but good to know about it. I recommend OEM oil with molyslip see if it helps. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
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