possible info on 7 speed auto
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Joined: Dec 2007
Posts: 526
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From: Phoenix
This is VERY good news. An auto shifting in a half second is lovely. Interesting to note, the lower HP, AT SS Camaro is faster to 60 and around the track than the manual.
I would expect Nissan/Infiniti to match if not better that. I would not be surprised if the 7 speed AT Z is as quick as, if not quicker than the MT. 7 Speeds = broad powerband in each gear. While I would like a DSG, this will do!!
Can't wait to test drive!!
I would expect Nissan/Infiniti to match if not better that. I would not be surprised if the 7 speed AT Z is as quick as, if not quicker than the MT. 7 Speeds = broad powerband in each gear. While I would like a DSG, this will do!!
Can't wait to test drive!!
That's true that automatics could be boring sometimes but these manual tranny's are smarter than NASA scientists. These auto tranny's shifts faster than any human being can shift. They rev matches smoother than any human being can ever imagine. I really wouldn't mind giving this tranny a shot.
(on my last sentence, by saying tranny, I meant transmission 
)
(on my last sentence, by saying tranny, I meant transmission )
That's true that automatics could be boring sometimes but these manual tranny's are smarter than NASA scientists. These auto tranny's shifts faster than any human being can shift. They rev matches smoother than any human being can ever imagine. I really wouldn't mind giving this tranny a shot.
(on my last sentence, by saying tranny, I meant transmission )
(on my last sentence, by saying tranny, I meant transmission )
Well since I am a cheap bastard, and I will wait till 2nd year production to skip paying the premium of a new release vehicle. I will see how this new transmission turns out. If all turns out in my favor its not a POS can handle some power and shifts fast enough and the rev matching is spot on why not!
I hated my clutch. That thing used to sit so high up and if you wanted to shift you needed to press the clutch nearly through the floor board or you will hear a grind. I dunno maybe this is normal, all I used to drive prior this Z was BMW's and there manual's are a joy to drive.
I used to ***** all the time that nissan's tranny sucked and they should have gotten Borg-Warner (now ZF) to build them.
I do love the short-throw of the Nissan tranny. The BMW tranny was like rowing a boat! But ti was sooooo smooth.
Will the paddle shifters be like the smg bmws, letting you rev to any rpm while your in paddle shiter mode? or will they be just so that you can shifter sooner while normally accelerating?
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Joined: Jun 2003
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From: San Francisco Bay Area
The 0.5s shift time is most likely for manual-mode because that's about as fast as a human can shift without stepping on a clutch pedal. In automatic-mode it will shift much faster because the computer controls the whole thing. It will probably be less than 200 milliseconds.
The current Nissan 5AT has a lot of the same features already that the new 7spd does.
A lot of people give the torque converter a bad rap without really knowing how it works. In general, a plate clutch automatic (DSG, SMG, etc) can have faster shift times in automatic mode (~100 milliseconds faster than a torque converter based AT). But, the torque converter does have it's advantages. A torque converter can create more torque than the engine is putting out by using a torque converter process called torque multiplication. If the impeller (engine side) has a greater speed than the turbine (driveshaft side) of the torque converter the stator will return the excess energy back to the impeller to be re-accelerated and to create more torque until the turbine is at the same speed as the impeller then it will fluid couple or use a clutch lock. Depending on the stator, stall and gearing you can easily get 2x or more torque multiplication. The current Z 5AT get almost 2x. Modern dragsters get 4x or more. Another advantage the torque converter has is the ability to eliminate or minimize turbo lag. Turbochargers and torque converters make a great combination. An unlocked torque converter has the ability to slip and torque multiply. During this slipping process the turbos can be pre-loaded before launch or kept at a higher RPM during acceleration when the torque converter uncouples during high performance driving. One of the cheapest mods you can get with the most bang for buck is a High Stall Torque Converter.
Despite the misconceptions, torque converters use several clutches as opposed to one or two plate clutches as used in F1 of DSG. The modern performance torque converter only uses fluid dynamics while torque multiplying or slipping. There is no hydraulic interaction when the torque converter is locked-up with a mechanical clutch. In lock-up it acts just like a regular clutch transmission.
The current Nissan 5AT has a lot of the same features already that the new 7spd does.
A lot of people give the torque converter a bad rap without really knowing how it works. In general, a plate clutch automatic (DSG, SMG, etc) can have faster shift times in automatic mode (~100 milliseconds faster than a torque converter based AT). But, the torque converter does have it's advantages. A torque converter can create more torque than the engine is putting out by using a torque converter process called torque multiplication. If the impeller (engine side) has a greater speed than the turbine (driveshaft side) of the torque converter the stator will return the excess energy back to the impeller to be re-accelerated and to create more torque until the turbine is at the same speed as the impeller then it will fluid couple or use a clutch lock. Depending on the stator, stall and gearing you can easily get 2x or more torque multiplication. The current Z 5AT get almost 2x. Modern dragsters get 4x or more. Another advantage the torque converter has is the ability to eliminate or minimize turbo lag. Turbochargers and torque converters make a great combination. An unlocked torque converter has the ability to slip and torque multiply. During this slipping process the turbos can be pre-loaded before launch or kept at a higher RPM during acceleration when the torque converter uncouples during high performance driving. One of the cheapest mods you can get with the most bang for buck is a High Stall Torque Converter.
Despite the misconceptions, torque converters use several clutches as opposed to one or two plate clutches as used in F1 of DSG. The modern performance torque converter only uses fluid dynamics while torque multiplying or slipping. There is no hydraulic interaction when the torque converter is locked-up with a mechanical clutch. In lock-up it acts just like a regular clutch transmission.
The 0.5s shift time is most likely for manual-mode because that's about as fast as a human can shift without stepping on a clutch pedal. In automatic-mode it will shift much faster because the computer controls the whole thing. It will probably be less than 200 milliseconds.
The current Nissan 5AT has a lot of the same features already that the new 7spd does.
A lot of people give the torque converter a bad rap without really knowing how it works. In general, a plate clutch automatic (DSG, SMG, etc) can have faster shift times in automatic mode (~100 milliseconds faster than a torque converter based AT). But, the torque converter does have it's advantages. A torque converter can create more torque than the engine is putting out by using a torque converter process called torque multiplication. If the impeller (engine side) has a greater speed than the turbine (driveshaft side) of the torque converter the stator will return the excess energy back to the impeller to be re-accelerated and to create more torque until the turbine is at the same speed as the impeller then it will fluid couple or use a clutch lock. Depending on the stator, stall and gearing you can easily get 2x or more torque multiplication. The current Z 5AT get almost 2x. Modern dragsters get 4x or more. Another advantage the torque converter has is the ability to eliminate or minimize turbo lag. Turbochargers and torque converters make a great combination. An unlocked torque converter has the ability to slip and torque multiply. During this slipping process the turbos can be pre-loaded before launch or kept at a higher RPM during acceleration when the torque converter uncouples during high performance driving. One of the cheapest mods you can get with the most bang for buck is a High Stall Torque Converter.
Despite the misconceptions, torque converters use several clutches as opposed to one or two plate clutches as used in F1 of DSG. The modern performance torque converter only uses fluid dynamics while torque multiplying or slipping. There is no hydraulic interaction when the torque converter is locked-up with a mechanical clutch. In lock-up it acts just like a regular clutch transmission.
The current Nissan 5AT has a lot of the same features already that the new 7spd does.
A lot of people give the torque converter a bad rap without really knowing how it works. In general, a plate clutch automatic (DSG, SMG, etc) can have faster shift times in automatic mode (~100 milliseconds faster than a torque converter based AT). But, the torque converter does have it's advantages. A torque converter can create more torque than the engine is putting out by using a torque converter process called torque multiplication. If the impeller (engine side) has a greater speed than the turbine (driveshaft side) of the torque converter the stator will return the excess energy back to the impeller to be re-accelerated and to create more torque until the turbine is at the same speed as the impeller then it will fluid couple or use a clutch lock. Depending on the stator, stall and gearing you can easily get 2x or more torque multiplication. The current Z 5AT get almost 2x. Modern dragsters get 4x or more. Another advantage the torque converter has is the ability to eliminate or minimize turbo lag. Turbochargers and torque converters make a great combination. An unlocked torque converter has the ability to slip and torque multiply. During this slipping process the turbos can be pre-loaded before launch or kept at a higher RPM during acceleration when the torque converter uncouples during high performance driving. One of the cheapest mods you can get with the most bang for buck is a High Stall Torque Converter.
Despite the misconceptions, torque converters use several clutches as opposed to one or two plate clutches as used in F1 of DSG. The modern performance torque converter only uses fluid dynamics while torque multiplying or slipping. There is no hydraulic interaction when the torque converter is locked-up with a mechanical clutch. In lock-up it acts just like a regular clutch transmission.
I drove the 7AT last night in a test car (not in a Z). I cant give a full review as it was a very quick drive, but it seemed very sporty. In DS mode it shifted at redline when at WOT and no paddle intervention. It also downshifted and rev matched very smoothly. It was said that the 7AT is just a little faster than the 6MT will be, but obviously not as fun if you are looking for the full experience. Its a toss up for me, at least in a G sedan. In the new Z, there would be no question . . . manual only.
