lack of momentum?

[archer6366]

I've been driving the 135 (auto with DCT) for a couple of weeks now... it feels like it does not pick up much momentum- If I lift my foot off the accelerator, it comes to a stop pretty quickly.

is that normal? how do you feel about it?

[Colt]

Originally Posted by archer6366

I've been driving the 135 (auto with DCT) for a couple of weeks now... it feels like it does not pick up much momentum- If I lift my foot off the accelerator, it comes to a stop pretty quickly.

is that normal? how do you feel about it?

Do you lift your foot off completely in less than a second and the engine feels like it does a CLUNK?

[Stohlen]

Its a progressive throttle design, not a linear one. So as you push your foot down, it exponentially opens. You can change this with the right tuning software.

[1speedbike]

Yeah I feel like there's a lot of "engine braking" going on. Like when you're going down a hill and the gearing keeps you from rolling out of control, but also on flat roads it seems to slow down the car a lot more than I notice on other cars. I think it's the throttle design as @Stohlen mentioned. It's normal.

[flinchy]

it's called compression braking

totally normal.

Originally Posted by Stohlen

Its a progressive throttle design, not a linear one. So as you push your foot down, it exponentially opens. You can change this with the right tuning software.

has nothing to do with the throttle, and it's not exponential, it's linear voltage.

[CC]

Originally Posted by archer6366

I've been driving the 135 (auto with DCT) for a couple of weeks now... it feels like it does not pick up much momentum- If I lift my foot off the accelerator, it comes to a stop pretty quickly.

is that normal? how do you feel about it?

Could it be that you are used to traditional auto transmissions with a torque converter?

[archer6366]

Originally Posted by CC

Could it be that you are used to traditional auto transmissions with a torque converter?

can you explain?

[int2str]

Originally Posted by archer6366

can you explain?

Not sure if this is what he meant, but here I go:

In a "traditional" automatic transmission, there is a torque converter that sits between the engine and the transmission. This is usually a viscous (liquid) coupling that relies on a compressor and a turbine to transfer power from the engine to the transmission and still allow the engine to idle.

If the engine spins faster than the transmission (ex. you're on the throttle), the compressor accelerates the liquid which drives the turbine and thus spins the output shaft to the transmission. Conversely, if the engine spins slower than the transmission (ex. when you're slowing down/lift the throttle), not enough pressure is built in in the compressor, thus the liquid does not drive the turbine and effectively disconnects the engine from the transmission.

Since the process is fluid based, it's very smooth and gentle and also very progressive.

With a Dual-clutch transmission, there are - as the name implies - two actual clutch plates connected to two pressure plates. Your car's computer controls the connection between the clutches and decides which should be engaged at any given time.

When you slow down a DCT car, the clutch is still 100% connected to the engine, thus you are experiencing the same engine braking that a manual transmission driver would (up to a point where the computer prevents stalling by actuating the clutch).

That's the principal difference between the two systems and why they might feel different to you.

Again, hope that's what "CC" meant to say

[rking117]

Originally Posted by int2str

Not sure if this is what he meant, but here I go:

In a "traditional" automatic transmission, there is a torque converter that sits between the engine and the transmission. This is usually a viscous (liquid) coupling that relies on a compressor and a turbine to transfer power from the engine to the transmission and still allow the engine to idle.

If the engine spins faster than the transmission (ex. you're on the throttle), the compressor accelerates the liquid which drives the turbine and thus spins the output shaft to the transmission. Conversely, if the engine spins slower than the transmission (ex. when you're slowing down/lift the throttle), not enough pressure is built in in the compressor, thus the liquid does not drive the turbine and effectively disconnects the engine from the transmission.

Since the process is fluid based, it's very smooth and gentle and also very progressive.

With a Dual-clutch transmission, there are - as the name implies - two actual clutch plates connected to two pressure plates. Your car's computer controls the connection between the clutches and decides which should be engaged at any given time.

When you slow down a DCT car, the clutch is still 100% connected to the engine, thus you are experiencing the same engine braking that a manual transmission driver would (up to a point where the computer prevents stalling by actuating the clutch).

That's the principal difference between the two systems and why they might feel different to you.

Again, hope that's what "CC" meant to say

this was the best explaination i have heard in a while. Great job.

[doublevanosrc]

Originally Posted by rking117

this was the best explaination i have heard in a while. Great job.

I agree, I would have no idea how to even start explaining all that.

[archer6366]

Originally Posted by int2str

Not sure if this is what he meant, but here I go:

In a "traditional" automatic transmission, there is a torque converter that sits between the engine and the transmission. This is usually a viscous (liquid) coupling that relies on a compressor and a turbine to transfer power from the engine to the transmission and still allow the engine to idle.

If the engine spins faster than the transmission (ex. you're on the throttle), the compressor accelerates the liquid which drives the turbine and thus spins the output shaft to the transmission. Conversely, if the engine spins slower than the transmission (ex. when you're slowing down/lift the throttle), not enough pressure is built in in the compressor, thus the liquid does not drive the turbine and effectively disconnects the engine from the transmission.

Since the process is fluid based, it's very smooth and gentle and also very progressive.

With a Dual-clutch transmission, there are - as the name implies - two actual clutch plates connected to two pressure plates. Your car's computer controls the connection between the clutches and decides which should be engaged at any given time.

When you slow down a DCT car, the clutch is still 100% connected to the engine, thus you are experiencing the same engine braking that a manual transmission driver would (up to a point where the computer prevents stalling by actuating the clutch).

That's the principal difference between the two systems and why they might feel different to you.

Again, hope that's what "CC" meant to say

wouldn't this affect gas mileage?

[CC]

Originally Posted by int2str

Not sure if this is what he meant, but here I go:

In a "traditional" automatic transmission, there is a torque converter that sits between the engine and the transmission. This is usually a viscous (liquid) coupling that relies on a compressor and a turbine to transfer power from the engine to the transmission and still allow the engine to idle.

If the engine spins faster than the transmission (ex. you're on the throttle), the compressor accelerates the liquid which drives the turbine and thus spins the output shaft to the transmission. Conversely, if the engine spins slower than the transmission (ex. when you're slowing down/lift the throttle), not enough pressure is built in in the compressor, thus the liquid does not drive the turbine and effectively disconnects the engine from the transmission.

Since the process is fluid based, it's very smooth and gentle and also very progressive.

With a Dual-clutch transmission, there are - as the name implies - two actual clutch plates connected to two pressure plates. Your car's computer controls the connection between the clutches and decides which should be engaged at any given time.

When you slow down a DCT car, the clutch is still 100% connected to the engine, thus you are experiencing the same engine braking that a manual transmission driver would (up to a point where the computer prevents stalling by actuating the clutch).

That's the principal difference between the two systems and why they might feel different to you.

Again, hope that's what "CC" meant to say

Yeah, what he said