Preserving transmission synchros

Rahul718 · 04-07-2015, 07:55 AM

So... sort of stupid question to ask and it's in line with my OCD about my car...

A while back I swear I was having the same issues as the OP in terms of the SRM acting funny when sometimes up shifting into 5th gear from 4th. I now understand it was driver error as I was hitting the gate of 4th very slightly on my way to 5th.

However, for a period of about 2 weeks I was trying to replicate the issue by up shifting from 4th - 5th between 4-5k rpm continuously all the time, during my commute, during my spirited driving, etc. I must have done a few hundred of these upshifts in that RPM range. However, I was very careful about these upshifts and never shifted hard or too fast. I would go up from 4th, pushed the shifter to the right and up into 5th - I never once diagonally up shifted and always kind of eased it into 5th during these up shifts.

It remains smooth as butter but I can't help but ponder if that did any damage to the synchro but continuously up shifting or if I accelerated any kind of wear. Again, it shifts great for the record.

NismoNY · 04-07-2015, 06:02 PM

Quote:

Originally Posted by Rahul718

So... sort of stupid question to ask and it's in line with my OCD about my car...

A while back I swear I was having the same issues as the OP in terms of the SRM acting funny when sometimes up shifting into 5th gear from 4th. I now understand it was driver error as I was hitting the gate of 4th very slightly on my way to 5th.

However, for a period of about 2 weeks I was trying to replicate the issue by up shifting from 4th - 5th between 4-5k rpm continuously all the time, during my commute, during my spirited driving, etc. I must have done a few hundred of these upshifts in that RPM range. However, I was very careful about these upshifts and never shifted hard or too fast. I would go up from 4th, pushed the shifter to the right and up into 5th - I never once diagonally up shifted and always kind of eased it into 5th during these up shifts.

It remains smooth as butter but I can't help but ponder if that did any damage to the synchro but continuously up shifting or if I accelerated any kind of wear. Again, it shifts great for the record.

If you don't experience any grinding now and it's smooth, I can't imagine you didn't anything that accelerated wear. I think it's as simple as that

Shotta · 04-07-2015, 09:40 PM

Don't drive around with the weight of your hand or arm constantly resting on the shift lever.

Rahul718 · 04-08-2015, 08:05 AM

Quote:

Originally Posted by NismoNY

If you don't experience any grinding now and it's smooth, I can't imagine you didn't anything that accelerated wear. I think it's as simple as that

I hear ya...It's just an uneasy feeling knowing that I possibly accelerated wear on that synchro from the higher rpm (4-5k) shifting

Quote:

Originally Posted by Shotta

Don't drive around with the weight of your hand or arm constantly resting on the shift lever.

I never heard of this. I thought once the shifter is locked into gear then it wouldn't matter

Shotta · 04-08-2015, 09:03 AM

Quote:

Originally Posted by Rahul718

I never heard of this. I thought once the shifter is locked into gear then it wouldn't matter

Google "resting hand on shifter" and lots of info will come up. It was one of the first things I was taught when I starting driving manuals 25 years ago and Im pretty sure it still holds true with todays manuals.

04-07-2015, 09:40 PM	#3 (permalink)
Shotta Enthusiast Member Join Date: Apr 2012 Location: Niagara Posts: 316 Drives: 2010 370z black M6 Rep Power: 15	Don't drive around with the weight of your hand or arm constantly resting on the shift lever. __________________ 6MT - designed for perfectionists 7AT - designed for enthusiasts

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04-07-2015, 07:55 AM	#1 (permalink)
Rahul718 Base Member Join Date: Nov 2013 Location: NYC Posts: 233 Drives: Nismo Z Rep Power: 13	So... sort of stupid question to ask and it's in line with my OCD about my car... A while back I swear I was having the same issues as the OP in terms of the SRM acting funny when sometimes up shifting into 5th gear from 4th. I now understand it was driver error as I was hitting the gate of 4th very slightly on my way to 5th. However, for a period of about 2 weeks I was trying to replicate the issue by up shifting from 4th - 5th between 4-5k rpm continuously all the time, during my commute, during my spirited driving, etc. I must have done a few hundred of these upshifts in that RPM range. However, I was very careful about these upshifts and never shifted hard or too fast. I would go up from 4th, pushed the shifter to the right and up into 5th - I never once diagonally up shifted and always kind of eased it into 5th during these up shifts. It remains smooth as butter but I can't help but ponder if that did any damage to the synchro but continuously up shifting or if I accelerated any kind of wear. Again, it shifts great for the record.