Buying this 07 Z, question on synchros - Transmissions gurus enter
#1
Buying this 07 Z, question on synchros - Transmissions gurus enter
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My friend and I checked out a 2007 Z (for him). Car checked out to be really good and being sold by the original owner with 70k miles. It drives great also, no issues with the gearbox. The seller admitted, and I don't know why, that he very frequently would "get on it" on the highway when shifting 4th to 5th, usually around 5k RPM. Even though the car drove wonderfully when I test drove it (high rpm and downshifting), my buddy is worried about any excess wear this may have caused.
The seller did say that though he often did the 4-5 shift at high rpm, he never slammed gears, grinded gears or fast shifted it. For some reason I believe him. He seemed like he really knew what he was doing and the car is mechanically mint and well taken care of. Clutch is original and feels new and tons of maintenance records.
Any thoughts on if this may have accelerated synchro wear even when the high rpm shifts were done properly?
My friend and I checked out a 2007 Z (for him). Car checked out to be really good and being sold by the original owner with 70k miles. It drives great also, no issues with the gearbox. The seller admitted, and I don't know why, that he very frequently would "get on it" on the highway when shifting 4th to 5th, usually around 5k RPM. Even though the car drove wonderfully when I test drove it (high rpm and downshifting), my buddy is worried about any excess wear this may have caused.
The seller did say that though he often did the 4-5 shift at high rpm, he never slammed gears, grinded gears or fast shifted it. For some reason I believe him. He seemed like he really knew what he was doing and the car is mechanically mint and well taken care of. Clutch is original and feels new and tons of maintenance records.
Any thoughts on if this may have accelerated synchro wear even when the high rpm shifts were done properly?
Last edited by pbn85; 04-09-2015 at 04:34 PM.
#3
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MY350Z.COM
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A transmission guru I'm not- just a Z racer who knows a bit about trannys. Shifting this six-speed box at 5K is not particularly hard on syncros, unless the driver is ham handed or clumsy in making the 4-5 shift. If your buddy is worried about wear, he should have a UOA done on a sample of the gearbox lube. The analysis will tell you more about the condition of the tranny than anything else.
Your buddy has more to worry about a faulty CSC than the tranny IMHO. Tell him to refill the tranny with Redline MT85 when he refills it for maximum protection and performance from his tranny.
Your buddy has more to worry about a faulty CSC than the tranny IMHO. Tell him to refill the tranny with Redline MT85 when he refills it for maximum protection and performance from his tranny.
#4
Appreciate the feedbacj....I'll send this link go my buddy.
But what point is getting the car and doing a oil analysis only to find out that the synchros are wearing? The idea would be to avoid getting the car in the first place if that's the case. I guess what I'm trying to say is that when I test drove it I tested that gear in high rpm and it was smooth, no issues at all, just the normal Z notchiness. Does that mean for the most part those synchros are fine?
For my own knowledge, I guess repeated high rpm shifting is fine so long as executed properly?
But what point is getting the car and doing a oil analysis only to find out that the synchros are wearing? The idea would be to avoid getting the car in the first place if that's the case. I guess what I'm trying to say is that when I test drove it I tested that gear in high rpm and it was smooth, no issues at all, just the normal Z notchiness. Does that mean for the most part those synchros are fine?
For my own knowledge, I guess repeated high rpm shifting is fine so long as executed properly?
#5
I'm not a transmission guru either but I would think that if you tested it out thoroughly and shifted into 5th at high rpm and it was smooth, then it doesn't have synchro problems. I could be wrong in saying this but RPM is irrelevant when it comes to wearing your synchros. Damage is really only done when you shift really fast, slam the gear when shifting and skipping gears. Anyone agree?
Buy that car if your friend is getting a good price for it.
Buy that car if your friend is getting a good price for it.
#6
General & DIY Moderator
MY350Z.COM
MY350Z.COM
iTrader: (64)
Appreciate the feedbacj....I'll send this link go my buddy.
But what point is getting the car and doing a oil analysis only to find out that the synchros are wearing? The idea would be to avoid getting the car in the first place if that's the case. I guess what I'm trying to say is that when I test drove it I tested that gear in high rpm and it was smooth, no issues at all, just the normal Z notchiness. Does that mean for the most part those synchros are fine?
For my own knowledge, I guess repeated high rpm shifting is fine so long as executed properly?
But what point is getting the car and doing a oil analysis only to find out that the synchros are wearing? The idea would be to avoid getting the car in the first place if that's the case. I guess what I'm trying to say is that when I test drove it I tested that gear in high rpm and it was smooth, no issues at all, just the normal Z notchiness. Does that mean for the most part those synchros are fine?
For my own knowledge, I guess repeated high rpm shifting is fine so long as executed properly?
#7
So he bought the car and requested the blackstone oil kit today for the gear oil he wants an analysis done on. The previous owner had gear oil changed every 20k with receipts. If the analysis comes out to be normal, does that mean synchros are good to go?
I don't anticipate any issues with this car but going to what CT07z said, is it true that high rpm shifting if done smoothly will not cause any synchro issues and that it's really when you slam gears and shift super fast that'll cause accelerated wear? Now I'm just asking for my own curiosity
I don't anticipate any issues with this car but going to what CT07z said, is it true that high rpm shifting if done smoothly will not cause any synchro issues and that it's really when you slam gears and shift super fast that'll cause accelerated wear? Now I'm just asking for my own curiosity
Last edited by pbn85; 04-11-2015 at 02:10 PM.
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#8
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MY350Z.COM
MY350Z.COM
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So he bought the car and requested the blackstone oil kit today for the gear oil he wants an analysis done on. The previous owner had gear oil changed every 20k with receipts. If the analysis comes out to be normal, does that mean synchros are good to go?
I don't anticipate any issues with this car but going to what CT07z said, is it true that high rpm shifting if done smoothly will not cause any synchro issues and that it's really when you slam gears and shift super fast that'll cause accelerated wear? Now I'm just asking for my own curiosity
I don't anticipate any issues with this car but going to what CT07z said, is it true that high rpm shifting if done smoothly will not cause any synchro issues and that it's really when you slam gears and shift super fast that'll cause accelerated wear? Now I'm just asking for my own curiosity
As for your second question, actually racing the same Z tranny for going on seven years sees it getting severe service indeed. Multiple upshifts near redline for lap-after-lap on road courses from one end of the country to the other. I find being relaxed, but precise, while making shifts keeps them clean. Believe me, there are bigger things (brake and tire wear, etc,) to worry about in racing!
#9
Appreciate your feedback DK.
I drove the car a lot yesterday with my buddy (made a lot of trips to get car stuff) and I really got on it upshifting into 5th so high as 6k a few times and it was smooth as can be. If there was a synchro it surely would have grinded with that high rpm I assume. i expect the UOA to come back normal.
I drove the car a lot yesterday with my buddy (made a lot of trips to get car stuff) and I really got on it upshifting into 5th so high as 6k a few times and it was smooth as can be. If there was a synchro it surely would have grinded with that high rpm I assume. i expect the UOA to come back normal.
#10
Appreciate your feedback DK.
I drove the car a lot yesterday with my buddy (made a lot of trips to get car stuff) and I really got on it upshifting into 5th so high as 6k a few times and it was smooth as can be. If there was a synchro it surely would have grinded with that high rpm I assume. i expect the UOA to come back normal.
I drove the car a lot yesterday with my buddy (made a lot of trips to get car stuff) and I really got on it upshifting into 5th so high as 6k a few times and it was smooth as can be. If there was a synchro it surely would have grinded with that high rpm I assume. i expect the UOA to come back normal.
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