NightBlueTTS

Looks like we agree?..isn’t this what I posted above?

shammerman

I do believe you and I are - I was responding to @Valvefloat991 . Here is more information.in detail how auto/stop start function saves gas while driving without actually stopping the engine as it does when at a light etc.Driving in coasting mode
Through attentive driving, fuel can be saved in coasting mode. The vehicle rolls with the engine disengaged and at idle speed without engine braking effect.

Preconditions for automatic coasting mode

1. Driving in selector lever position D
2. Auto Start Stop function/coasting mode is switched on.
   Indicator light on button is off.
3. “Sport”, “Sport Plus” and off-road mode is switched off
4. PSM is active
5. Cruise control/Adaptive Cruise Control is not active
6. Engine, transmission and battery are at operating temperature
7. Calm/economic driving style
8. Slight uphill or slight downhill gradients

• Slowly take your foot off the accelerator.

The engine is disengaged and runs at idle speed. The vehicle rolls with no engine braking effect. Coasting mode is recognizable by the idle speed indicated on the tachometer.

krburrell

I think what some folks are missing is that T9 is coming out with an update to their memory module that will remember the last position of the mode selector on the steering wheel, so the car will start in I, S, S+ for you. I know some folks automatically turn the mode **** as part of their routine of starting the car but sometimes I forget. I think this is great news and something that I have been wishing for since I got my car.

Jack F

Whats the price on this updated unit?

Valvefloat991

That could well have been what LexVan had in mind, though this system doesn't--can't--work with a manual, so it's not clear why he mentioned some benefit with the Auto Start Stop on the highway with a manual transmission.

I also wonder, how much fuel this "coasting" system saves. For example, If I release the accelerator because I see that I'm approaching a red light, I want the car to gradually slow down in gear, which engages the decal fuel shutoff. If the car disengages the clutch, shifts to neutrall, and the engine drops to idle, then in the above circumstance, the car isn't slowing down as much and it's using fuel in the process. Clearly, less efficient.

On the other hand, if you let off the accelerator when coasting down a hill, this "coasting" mode maximizes the car's momentum, though in the process, your speed might rise considerably above the speed limit.

digits

I've only seen the "coasting" mode work in 7th gear, so it's unlikely to affect me when approaching a red light - I'd use the brakes at some point and the PDK would downshift - and if I'm driving anywhere with traffic signals I've probably already turned my *** off. It doesn't kick in going uphill and also doesn't seem to kick in if I'm gaining velocity downhill. It's been a while, but I think you can manually engage it with an upshift paddle pull in 7th.

I'm also curious about how it works with a manual transmission, though.

rileyracing1

991's have Auto Stop Start ....I didn't know that ..How silly ..... I have my opinions on these newer cars but I am not going to start up ....

Carlo_Carrera

So you are just trolling then?

Valvefloat991

We're talking about three distinctly different functions here.

*** only operates at idle when the car is stopped, or nearly so. It turns off the engine and rpm drops to zero, until you take your foot off the brake.

Decel fuel shutoff, stops injecting fuel when you take your foot off the accelerator at any speed, in any gear, so long as the rpm is over 1000. So while the engine is spining at whatever rpm is produced by the combination of vehicle speed and gear selected, it is not running, since without nay fuel being injected, the cylinders are not firing. This function is present on all modern cars and cannot be turned off or otherwise affected by the driver. Turning the *** on or off ahs no effect on this function.

The coasting function has been previously described and is the equivalent of coasting with a manual transmission when you have depressed the clutch and/or shifted to neutral. Since the engine management computer cannot regulate the operation of a manual transmission, this function is only available with PDK.

amet

that’s how it was designed, it remembers where it was left last some the ignition was switched off.

medtech

No, never use it, and really happy that our Macan defaults to OFF. From what i've read the start/stop is a gimmick that manufacturers use to get their MPG ratings up. The EPA test course has the cars stopped about 50% of the time. Unless you are sitting still for half your drive, it's not helping much if at all.

digits

Sorry, I wasn't clear - the only reason coasting has come up at all in this thread is because you need to have *** turned on to enable coast mode. There's definitely two independent features tied to the *** button.

DHL

Don't think this is correct. It does remember disable *** but perhaps not other functions, but all I care about is *** in any case.

DHL

So that's what its doing? I always wondered why my tach was showing about 1000 RPM at 80 mph on the highway. Thought I was is some super overdrive.

DHL

Plus, I often expect the car to engine brake/slow down as I approach traffic on the highway with my foot off the gas. It is clearly not going to do that with this *** on. Another reason to disable this.