Syncros and Engine speed syncronization
Thread Starter
Racer
Joined: May 2008
Posts: 316
Likes: 0
From: San Deigo California
Syncros and Engine speed syncronization
So we all know that the C7 will have a 7 speed manual and will also have a computer feature to change the engine speed to so there will be a smooth shift. I am waiting on the road tests for this and I am sure it will be good. Smooth upshifts and downshifts I am sure. Cool.
But, think about it. The C7 will require an extra row of gears. How is GM getting the room for them:
1 - bigger transmission case, or
2 - smaller (and possibly weaker gears). or
3 - smaller synchro rings.
I wonder if this auto speed was a necessity to prevent premature wear-out of new and smaller synchro rings?
But, think about it. The C7 will require an extra row of gears. How is GM getting the room for them:
1 - bigger transmission case, or
2 - smaller (and possibly weaker gears). or
3 - smaller synchro rings.
I wonder if this auto speed was a necessity to prevent premature wear-out of new and smaller synchro rings?
Safety Car
Joined: Dec 2003
Posts: 3,641
Likes: 2,691
From: Pacific Northwest
So we all know that the C7 will have a 7 speed manual and will also have a computer feature to change the engine speed to so there will be a smooth shift. I am waiting on the road tests for this and I am sure it will be good. Smooth upshifts and downshifts I am sure. Cool. But, think about it. The C7 will require an extra row of gears. How is GM getting the room for them:
1 - bigger transmission case, or
2 - smaller (and possibly weaker gears). or
3 - smaller synchro rings.
I wonder if this auto speed was a necessity to prevent premature wear-out of new and smaller synchro rings?
1 - bigger transmission case, or
2 - smaller (and possibly weaker gears). or
3 - smaller synchro rings.
I wonder if this auto speed was a necessity to prevent premature wear-out of new and smaller synchro rings?
Maybe we all ought to find out reality first, not worry prematurely about a problem that doesn't yet, and might not ever exist.
Pro
Joined: Mar 2013
Posts: 742
Likes: 154
Article about the Tremec TR6070 transmission.
http://www.gmhightechperformance.com..._transmission/
Looks like it's about 40mm longer.
So, I think option #1 was the route they chose, and weaker components was not.
-T
http://www.gmhightechperformance.com..._transmission/
Looks like it's about 40mm longer.
So, I think option #1 was the route they chose, and weaker components was not.
-T
Le Mans Master
Joined: Jul 2000
Posts: 6,559
Likes: 4,502
From: North Dallas 40 TX
Article about the Tremec TR6070 transmission.
http://www.gmhightechperformance.com..._transmission/
Looks like it's about 40mm longer.
So, I think option #1 was the route they chose, and weaker components was not.
-T
http://www.gmhightechperformance.com..._transmission/
Looks like it's about 40mm longer.
So, I think option #1 was the route they chose, and weaker components was not.
-T
Melting Slicks
Joined: Aug 2005
Posts: 2,874
Likes: 614
Seems like the Corvette team learned from the '05 launch and the Z06/ZR1 developments.
Between the twin disc, strengthened diff, halfshafts and built up trans, looks like the car is ready for some hard driving out of the box.
Between the twin disc, strengthened diff, halfshafts and built up trans, looks like the car is ready for some hard driving out of the box.
Melting Slicks
Joined: Nov 2004
Posts: 2,592
Likes: 393
St. Jude Donor 05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17
So we all know that the C7 will have a 7 speed manual and will also have a computer feature to change the engine speed to so there will be a smooth shift. I am waiting on the road tests for this and I am sure it will be good. Smooth upshifts and downshifts I am sure. Cool.
But, think about it. The C7 will require an extra row of gears. How is GM getting the room for them:
1 - bigger transmission case, or
2 - smaller (and possibly weaker gears). or
3 - smaller synchro rings.
I wonder if this auto speed was a necessity to prevent premature wear-out of new and smaller synchro rings?
But, think about it. The C7 will require an extra row of gears. How is GM getting the room for them:
1 - bigger transmission case, or
2 - smaller (and possibly weaker gears). or
3 - smaller synchro rings.
I wonder if this auto speed was a necessity to prevent premature wear-out of new and smaller synchro rings?
Let's keep in mind here that rev match will have very little to do with synchro wear and will not really smooth the actual shifting of the transmission as we are not double clutching.
Intermediate
Joined: Jul 2013
Posts: 43
Likes: 0
The Nissan 370Z has had that rev matching feature on manual transmissions since 2009. I've experienced it on that car, and IMO it's gimmicky and pointless. Maybe there are some people who use it every day, but it kind of defeats the purpose of a manual transmission.
You have a manual specifically so that you don't have a computer doing stuff like that for you.
You have a manual specifically so that you don't have a computer doing stuff like that for you.
Le Mans Master
Joined: Apr 2013
Posts: 6,671
Likes: 4,144
2020 C8 of the Year Finalist - Unmodified
The Nissan 370Z has had that rev matching feature on manual transmissions since 2009. I've experienced it on that car, and IMO it's gimmicky and pointless. Maybe there are some people who use it every day, but it kind of defeats the purpose of a manual transmission.
You have a manual specifically so that you don't have a computer doing stuff like that for you.
You have a manual specifically so that you don't have a computer doing stuff like that for you.
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Melting Slicks
Joined: Nov 2004
Posts: 2,592
Likes: 393
St. Jude Donor 05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17
The Nissan 370Z has had that rev matching feature on manual transmissions since 2009. I've experienced it on that car, and IMO it's gimmicky and pointless. Maybe there are some people who use it every day, but it kind of defeats the purpose of a manual transmission.
You have a manual specifically so that you don't have a computer doing stuff like that for you.
You have a manual specifically so that you don't have a computer doing stuff like that for you.
There will be very little benefit in street driving.
If it is implemented properly it could be very beneficial to those that can't or don't care to heel and toe at the track.
I can hardly wait to try it out. Then add on the elec. diff. and it should be the cat's rear.