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

[Andy13186]

My preference is definitely to paddle shift, but I just wish it was a 6 speed configuration.

When downshifting multiple gears as you describe, I have had issues where it takes way too long to incrementally go down through the gears, and I can't properly time my throttle input because of the lag. For highway driving, I definitely seem to get more immediate power in the auto S mode as opposed to downshifting with the paddles, which is a big help for quick lane changes in dense highway traffic.

Another issue is, how do you address upshifting out of first when making a left turn from a stop? It was no problem on the GTI because I could use the stick like another paddle shifter by pushing it forward, but with paddles only in the GT, this seems awkward to me.

This is another kind of weird awkward thing for the 10r80 due to the first gear being so short, I usually just rev it up a bit higher than normal so I get through the turn before shifting if its a right turn, if its a left I just hit 2nd asap before the wheel is too turned, sometimes I hit it when the wheel is upside down. If its a stop sign though, or you dont come to a complete stop the 10r80 stays in 3rd down to like 3-4 mph. It is also really weird that we can start from a stop in 2nd gear but we cant shift to 2nd gear below like 5 mph if we are moving but we can stay in 3rd down to like 5 mph. The torque converter stays loose in 3rd when you are rolling slow and you can accelerate up to ~10-15 mph and it locks then it feels basically normal.

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[Norm Peterson]

You get used to it, instead of clutching in and going down 2 gears you just click the downshift button 3-4 times depending on what gear you are in.

But how is it on the 'upshift' side in easy driving? Having to make four shifts between 20 mph and 40 is more shifting than even I'm willing to do. But leaving that part up to the transmission and its control module isn't any better of a solution for me.

I know that if im in 10th going 80 I do need to hit the paddle 5-6 times while rolling into full throttle. Thats probably most annoyance you get, but in performance driving on tracks and stuff , you never really get out of 6th gear most of the time, depending on the track. And upshifting at WOT is like pulling a trigger that sets you back right to your favorite part of the RPM range.

I can see where once you're running hard on the track that you wouldn't use all of the gears and that the shifting becomes a lot more predictable than it's apt to be in street driving.

I've driven a handful of paddle-shifted cars, and based on that much I would much prefer a console-located +/- shifter gate to the paddles/buttons. One of those cars had both paddles and a +/- gate, so the A-B-A comparison was same roads/same day/same hour/almost the same minute.


Norm

 

[shogun32]

When I was driving the A10 EB, GT and Camaro I found it most useful to just leave it in 'D' or 'S' as opposed to fully-manual mode and countermand/preempt with the paddle. In traffic you could see an opening develop and give it 2 clicks. The trans would stay put for about 10 seconds. Or approaching a curve 'bang' downshifts under braking. I found the GM tune of the A10 on the SS to be far more pleasant and compatible than the Ford tune. For drag racing I would personally leave it in fully manual mode. I much prefer the 'slow' 6MT though.

 

[jpindustrie]

Too many gears on the 10 speed IMO , let it 'row its own' seems to be happier in that range...

but that is so typical of the torque converter transmission

DCT in GT500 will change the Mustang experience and add a new level of transcendence that the Boss 302 and GT350R were doing

 

[V00D00]

Provides a permanent manual gear selection where full control of gear selection is
required
Manual does not automatically upshift even if the engine is approaching the RPM
limit
It must be shifted manually by pulling the + paddle
Pull and release (tap) the right paddle + to upshift.
Pull and release (tap) the left paddle – to downshift
Pull and hold both of the right paddle + and the left paddle – for temporary neutral
position
Neutral will remain until both paddles are released
Pull and hold the right paddle + to command the transmission to sequentially
upshift to the maximum allowed gear
Pull and hold the left paddle – for the lowest allowable gear

 

[V00D00]

Lunch Control:

Optimizes launch traction during a standing start
Selectable in the Cobra menu
The rpm setting allows the user to set launch rpm value within the allowable range
Feature is automatically selected when in Drag Strip drive mode
Lets drivers set and hold the desired launch rpm depending on tire temperature,
surface conditions or weather
Not intended for cold, wet or slippery conditions
Intended for use only where consistent acceleration is desired
Integrated with AdvanceTrac and the engine control system to minimize wheelslip
during a standing start
Provides a unique “drag start” traction calibration specifically designed for high-grip
surfaces
Can be turned on and off via the Cobra menu
The rpm set point can only be changed in the Track Apps menu using the 5-way
control pad
Launch control setting does not turn on/off with key cycle
The rpm setting allows the driver to set launch rpm value within the allowable
range
Launch control engine rpm set point range is available in 100 rpm increments


NOTE: Launch control is engineered to be used with the original equipment provided on Shelby GT500. Any modifications to the vehicle may affect feature function or performance.
NOTE: Launch control is only available if the coolant temperature is more than 170°F.

 

[Andy13186]

But how is it on the 'upshift' side in easy driving? Having to make four shifts between 20 mph and 40 is more shifting than even I'm willing to do. But leaving that part up to the transmission and its control module isn't any better of a solution for me.

Upshifting the 10r80 is as easy as clicking a mouse button basically, you dont even have to take your hands off the wheel...

I love the different transmission modes for the 10r80 , so much fun.

the DCT should be fun in the gt500 too , probably even more fun.

The gearing and shift firmness in the 10r80 in drag mode lets you burn through 2nd gear up to 60 mph or 3rd go to like 75 mph NA, holding rpms at 7800 (I am tuned so rev limiter is 8200 but normal shift point is 7500)

I also have the transbrake feature in my tune but I dont use it yet. Its not useful on the street.

 

[V00D00]

Gears 1st 2nd 3rd 4th 5th 6th 7th Rev.
TREMEC TR-9070 7-speed dualclutch
3.14 2.05 1.43 1.10 0.86 0.68 0.56 2.76

 

[Andy13186]

Gears 1st 2nd 3rd 4th 5th 6th 7th Rev.
TREMEC TR-9070 7-speed dualclutch
3.14 2.05 1.43 1.10 0.86 0.68 0.56 2.76

10R80 Transmission Gear Ratios
First – 4.70
Second – 2.99
Third – 2.15
Fourth – 1.80
Fifth – 1.52
Sixth – 1.28
Seventh – 1.00
Eighth – 0.85
Ninth – 0.69
Tenth – 0.64
Reverse – 4.87

Whats the rear end gearing for the gt500? the 10r80 cars have 3.55 and 3.31 I think

I kind of wish 10th was a bit lower geared than it is, more of a super overdrive for highway cruising MPG. From what ive read the gt500 has a torsen LSD , pp1 gt's have a torsen with 3.55's, I wonder if the diff is the same.

 

[V00D00]

10R80 Transmission Gear Ratios
First – 4.70
Second – 2.99
Third – 2.15
Fourth – 1.80
Fifth – 1.52
Sixth – 1.28
Seventh – 1.00
Eighth – 0.85
Ninth – 0.69
Tenth – 0.64
Reverse – 4.87

Whats the rear end gearing for the gt500? the 10r80 cars have 3.55 and 3.31 I think

I kind of wish 10th was a bit lower geared than it is, more of a super overdrive for highway cruising MPG.

3.73

im using the known specs now to redo the calculator, see where we are at

 

[shogun32]

pp1 gt's have a torsen with 3.55's

EB+PP1 is 3.55. The GT+PP1 has 3.73. I wish there had been an option for 3.55 though

 

[Andy13186]

GT500 does have a torsen LSD like the pp1 gt's. not sure of the ratio though.

3.73

im using the known specs now to redo the calculator, see where we are at

Tires are 315 30 20 ~27.5 inches, redline 7500 rpm

First gear should end at 52 mph, second at 80, third at 115, 4th at 149, 5th at 191, but its limited to 180 so it should hit its limiter of 180 in 5th. Should cross the 1/4 mile in 4th.

 

[Andy13186]

EB+PP1 is 3.55. The GT has 3.73

the 10r80 GT cars have 3.55s, manuals have the 3.73

 

[V00D00]

GT500 does have a torsen LSD like the pp1 gt's. not sure of the ratio though.

Tires are 315 30 20 ~27.5 inches, redline 7500 rpm

First gear should end at 52 mph, second at 80, third at 115, 4th at 149, 5th at 191, but its limited to 180 so it should hit its limiter of 180 in 5th

stock left, drag radials right.

ill use both as soon as i find a closer dyno to get HP/tq from

 

[Andy13186]

So not really ideal gearing for 0-60 or 1/4 mile it seems. =/ should have a great powerband though anyway and may be able to raise the limiter to like 8000, who knows.

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