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7 speed DCT vs 10r80 for Drag racing? Road racing?

Hack

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The section in bold. They aren't "automatics" nor are they "generally faster" just because they make the drivers job easier (although I agree that plays a part and helps), but they are outright faster at shifting and typically have more gears that can be spaced closer together to keep the engine closer to peak power longer than a normal manual transmission.
I agree that the automatic shifting that the car's computer does of a DCT for the driver is way faster than anyone can shift a real manual transmission. I agree that more gears that DCT automatics have helps as well.
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Eritas

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Forced induction is an accurate, if general, term for those. A little like how 'throttle body' covers those other devices. Whether PD, centri-, or turbo, this discussion is not about detail differences among forms of FI. And like I said before I hardly ever talk about them so there's never been much need for me to get more specific about them. Your best bet for that would be to look in any thread I posted in that involved turbochargers (I think I'm plenty specific there). I'll leave most everything else about FI to those who chase big power.
I don't care to stalk you or your posts.

Ok, so you're a turbo guy? How about ignorantly calling 'twin-scroll' turbos "twin-turbo" because they both technically have 2 of something, eg: Many my ecoboost mustang is a badass "twin turbo". My point is, you're hypocritical by being specific on one topic and intentionally ignorant on another (transmissions).


I don't think grooves in a drum is much like any pneumatic solenoid. But that really doesn't matter when all you need to do is move gears, sliders/synchros, or dogs axially into and out of engagement. I'm sure that a DCT type of transmission could be made that would be shifted via a console-mounted hand-shifter to bring that much of DCT operation into the strictly-manual domain. I hope you can at least see that it would be possible.
The solenoids replace the lever acting on the drum. This enables paddle shifters or a electronic control module to command the shifts. It's crazy that you would lump the transmission of pretty much every motorcycle and most professional race transmissions in with an 'automatic'. :crazy:

Some BMWs have console mounted shifters so you can shift that way rather than the paddle shifters. But both are DBW systems and shouldn't mean anything in the classification of a transmission. If you still think a DCT could be made to be shifted mechanically with a lever and a pedal mounted clutch, you clearly do not understand how DCTs work.

But hey, if to you think a transmission with dog rings, synchros, and/or clutches, can still qualify it as an 'automatic', I have nothing for you.

Those are not distinguishing characteristics that would separate a DCT from the automatic category. Important, sure. But not classification-changing. Like a conventional automatic with a tune or a shift kit is still an automatic even though it also shifts faster than OE. Let me get back to you on the matter of what closer gear spacing and quicker shift times might actually mean (I hope to have some numbers).
I wasn't replying to you, and that was a 2 part response: 1 - DCTs aren't automatic (even though you believe them to be). and 2 - DCTs aren't "generally faster" solely because they reduce the chance of driver error. They're outright faster at shifting and enable the use of more, closer spaced gear ratios -that's a fact.

How would you categorize a Lenco transmission (the kind that uses a clutch rather than a torque converter like the Lencodrive)? Or a Clutchflite?
A Lenco is a dog-ring sequential gearbox, even though it does not use a drum. Clutchflites are weird, defunct hybrids. I'm not sure how to categorize it. Maybe a "clutch-operated automatic" but even then, that's not technically accurate but it's far better than calling them both an "automatic".

There's multiple examples of weird transmissions out there. I can't recall the car or transmission but you can pre-select a gear while already in another gear, and then once you push the clutch in, the transmission shifts into that gear and once you let the clutch back out, you're in that next gear, and can then select your next gear choice at any time. I'd have to see how it works to better define it, but it sure isn't accurate to call that an "automatic" either.
 

seth21w

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And I'm gonna say that you would be wrong.
If the 10r80 were going to shift faster and outperform the 7 speed why on earth didnt they just use the 10 speed in the new gt500? Because unlike everyone in this forum ford engineers have tested this specific transmission and know the performance is better on the 7speed. Common sense man!
 

protraxduner

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It appears the DCT and the 10r80 are maxed at there stated ratings or close. Anyone have any knowledge which ones will handle the inevitable HP increase after mods better? I would be concerned that beefing up the DCT might be more expensive but really don't know.
 

Eritas

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It seems like there are a few 10R80s making well beyond their stated ratings pretty reliably. Usually DCTs require a lot of $ upgrading parts to make them live at high power levels (for GTRs), maybe in a rwd application they can handle more?
 

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RaceHorseV8

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Porsche has realized that many of their customers dislike the DCT and prefer a manual. I've never seen a Ferrari at the road course. Aren't Ferraris mostly for sitting in the garage and looking at? If they get more than 10,000 miles on them the value tanks? Kind of like the Ford GT - mostly sits in the garage.
I saw a Testarossa at a track day at the Autobahn country club track. It had lot of people around it wondering how expensive it was going to be to fix the cracked head as it steamed away. Looked impressive though...
 

tws123

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It appears the DCT and the 10r80 are maxed at there stated ratings or close. Anyone have any knowledge which ones will handle the inevitable HP increase after mods better? I would be concerned that beefing up the DCT might be more expensive but really don't know.
It seems like there are a few 10R80s making well beyond their stated ratings pretty reliably. Usually DCTs require a lot of $ upgrading parts to make them live at high power levels (for GTRs), maybe in a rwd application they can handle more?
It appears the DCT and the 10r80 are maxed at there stated ratings or close. Anyone have any knowledge which ones will handle the inevitable HP increase after mods better? I would be concerned that beefing up the DCT might be more expensive but really don't know.
I have no factual information but I would have to say the 10r80 would hold up better to mods because I feel it will have more aftermarket support with vendors. I would prefer a manual or 10r80 to the dct. I feel either would be more reliable, easier to upgrade, less expensive than the dct therefore might possibly bring the msrp down on the gt500.
 

V00D00

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I don't care to stalk you or your posts.

Ok, so you're a turbo guy? How about ignorantly calling 'twin-scroll' turbos "twin-turbo" because they both technically have 2 of something, eg: Many my ecoboost mustang is a badass "twin turbo". My point is, you're hypocritical by being specific on one topic and intentionally ignorant on another (transmissions).


The solenoids replace the lever acting on the drum. This enables paddle shifters or a electronic control module to command the shifts. It's crazy that you would lump the transmission of pretty much every motorcycle and most professional race transmissions in with an 'automatic'. :crazy:

Some BMWs have console mounted shifters so you can shift that way rather than the paddle shifters. But both are DBW systems and shouldn't mean anything in the classification of a transmission. If you still think a DCT could be made to be shifted mechanically with a lever and a pedal mounted clutch, you clearly do not understand how DCTs work.

But hey, if to you think a transmission with dog rings, synchros, and/or clutches, can still qualify it as an 'automatic', I have nothing for you.


I wasn't replying to you, and that was a 2 part response: 1 - DCTs aren't automatic (even though you believe them to be). and 2 - DCTs aren't "generally faster" solely because they reduce the chance of driver error. They're outright faster at shifting and enable the use of more, closer spaced gear ratios -that's a fact.



A Lenco is a dog-ring sequential gearbox, even though it does not use a drum. Clutchflites are weird, defunct hybrids. I'm not sure how to categorize it. Maybe a "clutch-operated automatic" but even then, that's not technically accurate but it's far better than calling them both an "automatic".

There's multiple examples of weird transmissions out there. I can't recall the car or transmission but you can pre-select a gear while already in another gear, and then once you push the clutch in, the transmission shifts into that gear and once you let the clutch back out, you're in that next gear, and can then select your next gear choice at any time. I'd have to see how it works to better define it, but it sure isn't accurate to call that an "automatic" either.
DING DING DING! This guy gets it
 

Norm Peterson

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I don't care to stalk you or your posts.

Ok, so you're a turbo guy?
No. Normally aspirated. We have a car that's turbocharged (it's 6MT) specifically because the alternative powertrain combinations for that category of car were all hard deal-breakers.


It's crazy that you would lump the transmission of pretty much every motorcycle and most professional race transmissions in with an 'automatic'.
What's crazy is the effort you're going to, to intentionally misunderstand what I'm posting.


Some BMWs have console mounted shifters so you can shift that way rather than the paddle shifters.
Exactly the way I'd prefer to shift either a DCT or a conventional automatic. BMW might be on to something . . .


But both are DBW systems and shouldn't mean anything in the classification of a transmission.
Wasn't me who brought DBW into this thread . . .


If you still think a DCT could be made to be shifted mechanically with a lever and a pedal mounted clutch, you clearly do not understand how DCTs work.
No reason it couldn't be accomplished. All you have to do is figure out how to move the shift forks or dogs into and out of engagement. I didn't say I had it worked out, only that it could be.

You might want to look at Tremec's own literature so you can see that it uses shift forks. I think the problem of moving shift forks by moving a shift lever has already been solved, which would remove the 'automaticness'.


But hey, if to you think a transmission with dog rings, synchros, and/or clutches, can still qualify it as an 'automatic', I have nothing for you.
It doesn't matter how an automatic goes on to mechanically accomplish the gear change. "Automatic-ness" of a transmission lies in its ability to shift gears (ratios) with no input from you.


I wasn't replying to you, and that was a 2 part response: 1 - DCTs aren't automatic (even though you believe them to be). and 2 - DCTs aren't "generally faster" solely because they reduce the chance of driver error. They're outright faster at shifting and enable the use of more, closer spaced gear ratios

A Lenco is a dog-ring sequential gearbox, even though it does not use a drum.
Wrong. It's a planetary-geared transmission. Read up on it here.


Clutchflites are weird, defunct hybrids. I'm not sure how to categorize it. Maybe a "clutch-operated automatic" but even then, that's not technically accurate but it's far better than calling them both an "automatic".
It shifts automatically. That makes the transmission part of it automatic.


You're thinking of 'preselector' gearboxes, most notably the Wilson device of the 1930's. From the wikipedia entry
Preselector gearboxes are not automatic gearboxes, although they may have internal similarities. A fully automatic gearbox is able to select the ratio used; with a preselector gearbox, gear selection remains the driver's decision.


Norm
 
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Eritas

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So by your definition, if Ford or any company programs their hydraulic automatic transmissions to never shift unless commanded from a paddle or center console mounted lever would make said transmission a "manual"?

Thanks for the preselector gearbox comment. I blanked on that one.

No reason it couldn't be accomplished. All you have to do is figure out how to move the shift forks or dogs into and out of engagement. I didn't say I had it worked out, only that it could be.

You might want to look at Tremec's own literature so you can see that it uses shift forks. I think the problem of moving shift forks by moving a shift lever has already been solved, which would remove the 'automaticness'.
The shift forks aren't the problem. What is a problem is the fact that a clutch pedal would render the purpose of a DCT useless, if you open both clutches at the same time so you can manually shift gears. At that point a standard manual is far less complex and lighter and has no disadvantages over your proposed pedal operated dual clutch transmission.

If you looked at the evolution of a standard manual to DCT, SMGs automated both the shift fork and clutch, while DCTs were an evolution and offered an advantage of even faster shifts due to the ability of having 2 separate clutches activating odd and even gear ratios that are able to "blend" and overlap in a shift.
 
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Erik427

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Am I right in thinking the 10r80 will be better for drag racing, especially once torque converters come out? Is there a good way to launch a DCT on a drag strip? 10r80 can get a Tbrake tune too with no mods.

Im sure the DCT will be better on road courses but, on the drag strip I just dont see it being better than 10r80 as far as I know
10R80 is a force to be reckoned with.
 

Norm Peterson

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So by your definition, if Ford or any company programs their hydraulic automatic transmissions to never shift unless commanded from a paddle or center console mounted lever would make said transmission a "manual"?
No. That would be a manual mode, which isn't the same thing (and doesn't need to have a companion automatic mode available). Though for some, I'm sure it'd be a good enough simulation.


Thanks for the preselector gearbox comment. I blanked on that one.
Don't feel too bad, any more that's material for trivia games.


The shift forks aren't the problem. What is a problem is the fact that a clutch pedal would render the purpose of a DCT useless, if you open both clutches at the same time so you can manually shift gears. At that point a standard manual is far less complex and lighter and has no disadvantages over your proposed pedal operated dual clutch transmission.
I think the trick in making it even possible would be to be able to simultaneously disengage the clutch to the gear you're shifting from while engaging the clutch to the gear you're shifting to. While still being able to disengage both at the same time.

But you're right, what you'd end up with would be heavier and more complex.


If you looked at the evolution of a standard manual to DCT, SMGs automated both the shift fork and clutch, while DCTs were an evolution and offered an advantage of even faster shifts due to the ability of having 2 separate clutches activating odd and even gear ratios that are able to "blend" and overlap in a shift.
Yup . . .


Norm
 

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