S tronic vs zf automotic question

[mike0819]

New owner of an s tronic a7, I used to drive the zf 6 Speed, I manually shift my car 99 percent of the time.

Now driving the s tronic dsg for a couple of days, I noticed some difference with the zf.

First I feel the instant torque of the zf auto is gone, those who gets the 8 speed knows what I. M talking about. I feel from standing start, the instant torque of the torque converter is not there in the s tronic, I feel a little delay in power before it picks up

Seconds, I try to do brake launch on my s tronic, it just doesn't work, not launch control, I mean you put left foot on brakes right foot on gad, not all the way, just rev up a bit, I do that in my zf no problem at all, when I do it in my s tronic it just not moving, very strange and scary.

Last driving both manually, I feel the zf shift smoother, better in day to day traffic, on a hilly spirit driving road, I feel the s tronic shift faster, specially on the done shift, my zf sometimes shift very slow on down shift. Up shift speed is about the same.

That's how I feel like it. My next car will be an rs7 8 speed, is the 8 speed be bit better than the zf 6?which I have not driven yet. I hope there is an Tcu tune for the ZF8 on down shift speed yet.

[NickLim]

zf 8 speed as I understand it is pretty much superior to the DSG in every single way

Some people are going to go crazy about this, but here's why

*Shift times are identical
*The zf 8 speed is stronger
*The zf 8 speed is more reliable

The ZF 8 speed has more gears and is also better in traffic

- - - Updated - - -

Now there is one thing which is the "feel"

Some people could argue the feel of the DSG is more true to a traditional manual

[MadAboutCars]

Sorry, I can only agree with the stronger point. The S-Tronic is definitely faster upshifting and downshifting. A dual clutch can change gear in 100ms. Even audi advertises the new rs4 8 speed as almost as quick as a dual clutch. Without using AMAX the shifts are much slower, just listen to the farts they insert between gear changes. The only reason they allow it in AMAX is because there is a limit on how many times you can do it, as it's hard on a torque converter transmission.

I do also agree that the dual clutch is more like a manual transmission. They block brake launch as it's too hard on the clutches. That's why the have a launch control, because it leave the clutches disengaged until you lift off the brake.

The S-Tronic is an excellent transmission, once you get used to it. The upshift speed can be a big advantage when racing someone off the line. Also engine braking is much better with the dual clutch, more like a manual, so you are not on and off the brake pedal as much.

[NickLim]

Sorry, I can only agree with the stronger point. The S-Tronic is definitely faster upshifting and downshifting. A dual clutch can change gear in 100ms. Even audi advertises the new rs4 8 speed as almost as quick as a dual clutch. Without using AMAX the shifts are much slower, just listen to the farts they insert between gear changes. The only reason they allow it in AMAX is because there is a limit on how many times you can do it, as it's hard on a torque converter transmission.

I do also agree that the dual clutch is more like a manual transmission. They block brake launch as it's too hard on the clutches. That's why the have a launch control, because it leave the clutches disengaged until you lift off the brake.

The S-Tronic is an excellent transmission, once you get used to it. The upshift speed can be a big advantage when racing someone off the line. Also engine braking is much better with the dual clutch, more like a manual, so you are not on and off the brake pedal as much.

I read many sources saying the shift time for the stronic on the b8 s4 is 200ms which is equal zf

I'm open to learning if this is incorrect

[2wookies]

Are you driving a TDI A7? Thats the only A7 with a DSG as far as I know.

[Dippy]

First I feel the instant torque of the zf auto is gone, those who gets the 8 speed knows what I. M talking about. I feel from standing start, the instant torque of the torque converter is not there in the s tronic, I feel a little delay in power before it picks up

If you are referring to the torque multiplication caused by the stator then of course it won't be present in a dual clutch gearbox. Different technology altogether.

Seconds, I try to do brake launch on my s tronic, it just doesn't work, not launch control, I mean you put left foot on brakes right foot on gad, not all the way, just rev up a bit, I do that in my zf no problem at all, when I do it in my s tronic it just not moving, very strange and scary.

Wow. Don't do that - you'll wear out the clutch pack. Only rev the engine in N or using LC. You did that in your ZF (who also make dual clutch gearboxes by the way) because the torque converter allows it (but watch the temperature). Different technology altogether.

Last driving both manually, I feel the zf shift smoother, better in day to day traffic, on a hilly spirit driving road, I feel the s tronic shift faster, specially on the done shift, my zf sometimes shift very slow on down shift. Up shift speed is about the same.

Torque converter gearboxes are inherently smoother than DCT due to the fluid absorbing shock. But you can never get away from its elasticity, although good control of the lock-up will reduce its effect.

[wwhan]

The DSG is not designed for left foot braking, unless using the programmed launch control.

One should not left foot brake with foot on the throttle for a manual transmission car or the DSG transmission vehicle, since both are engaged with a clutch, NOT a torque converter. The ZF torque converter can handle the torque at just below the stall speed RPM of the converter.