PDK out of gear at lights?
Discussion
mhh said:
There's no reason to put the PDK into neutral at the lights. Doing so serves no purpose.
I explained two reasons, here is a third. I can detect the engine speed drop slightly after the load is removed from the shift to neutral.what is your source or expertise for your assertion?
I'm with NicD on this... the load on the engine falls when it goes from D to N.
Slush boxes dont care if the engine is sat in D when it's stopped, but I have to believe that the clutch plate(s) on a PDK do wear over time (otherwise the load wouldn't change) - and is exactly why the manual says not to leave it in D for any length of time.
Even with launch control the manual says not to hold it in that mode for more than a brief period because the transmission will overheat - so something is stressed - i just don't know what.
Slush boxes dont care if the engine is sat in D when it's stopped, but I have to believe that the clutch plate(s) on a PDK do wear over time (otherwise the load wouldn't change) - and is exactly why the manual says not to leave it in D for any length of time.
Even with launch control the manual says not to hold it in that mode for more than a brief period because the transmission will overheat - so something is stressed - i just don't know what.
GuitarPlayer63 said:
I'm with NicD on this... the load on the engine falls when it goes from D to N.
Slush boxes dont care if the engine is sat in D when it's stopped, but I have to believe that the clutch plate(s) on a PDK do wear over time (otherwise the load wouldn't change) - and is exactly why the manual says not to leave it in D for any length of time.
Even with launch control the manual says not to hold it in that mode for more than a brief period because the transmission will overheat - so something is stressed - i just don't know what.
My best info is under normal operating conditions (this does not include launch control) the clutch is not engaged when the PDK car is stopped and left in gear. Slush boxes dont care if the engine is sat in D when it's stopped, but I have to believe that the clutch plate(s) on a PDK do wear over time (otherwise the load wouldn't change) - and is exactly why the manual says not to leave it in D for any length of time.
Even with launch control the manual says not to hold it in that mode for more than a brief period because the transmission will overheat - so something is stressed - i just don't know what.
If I had to guess the slight engine load is the fluid friction between the discs of the wet multi-plate dis-engaged clutch. Remember both clutches are disengaged at this point so there are a lot of very large, rapidly spinning, wet clutch discs.
While I do not have a PDK equipped car I'd probably leave the gear shift in D and keep my foot on the brake just in case taking the foot off the brake was a sign/signal to the PDK controller the driver was about to accelerate from a stop and it might slightly engage the clutch to help make the take off a bit more seamless.
For a long stop, say at a train crossing, I'd slip the PDK into neutral. I'd ease it back into drive but I would have my foot on the brake.
Launch control mode is a whole 'nother animal. In this case the clutch is partially engaged to reduce the amount of time it takes to get the car moving. Were I to use the launch control I'd be as quick with it as possible. No dilly dallying about. Select it. Set it. Launch it. Done.
I use my PDK in manual most of the time. Having just tried putting it in neutral at the lights several times, I've found that it's a real pain in the ass having to make both movements. Much more fiddly in practice than having a manual car and keeping your foot on the clutch but with it in gear.
You can do it with the paddles too - pull both at once to go into N. Pull one of them to go back into gear. If you're at standstill it'll be 1. On the move I think it uses the gear you were in before you pulled N.
I assume there's a similar function with the 'standard' wheel and buttons.
S
I assume there's a similar function with the 'standard' wheel and buttons.
S
stevod said:
You can do it with the paddles too - pull both at once to go into N. Pull one of them to go back into gear. If you're at standstill it'll be 1. On the move I think it uses the gear you were in before you pulled N.
I assume there's a similar function with the 'standard' wheel and buttons.
S
Interesting - cheers. I thought that was a new PDK feature reserved for the new 991 GT3. Will try it out.I assume there's a similar function with the 'standard' wheel and buttons.
S
Oi U said:
Just a thought:
At night, just consider the guy behind you at the traffic lights having to sit looking at the glare from your brake lights.
That's precisely what I was getting at - it's not just Porsche owners with PDK that do. Too many lazy people around.At night, just consider the guy behind you at the traffic lights having to sit looking at the glare from your brake lights.
A standard insurance claim question asks whether you had the parking brake engaged when you're shunted into the car in front. What would you answer?
Oi U said:
Just a thought:
At night, just consider the guy behind you at the traffic lights having to sit looking at the glare from your brake lights.
With all automatic equipped cars around what's one more car with its brake lights on in a sea of cars with their brake lights on?At night, just consider the guy behind you at the traffic lights having to sit looking at the glare from your brake lights.
Besides, what I find with my manual transmission cars is some drivers are so used to automatics and their need to brake to slow down that when I take my foot off the gas and let the engine compression slow the car down some the following vehicle often gets way too close for comfort, I suspect the because the driver is not really paying attention to my car only looking for brake lights to come on.
NicD - I'm with you. I always move to N when stationary and use the handbrake if necessary. Like you, I believe the clutch is engaged when in D and I don't want to irritate the driver behind with my bright red LEDs.
Some previous posts appear to have been written by people without first-hand experience of PDK so it may be worth clarifying!
(I am referring to 2008 and on PDK on a 997.2. I believe this is the first generation of PDK.)
1. When in D, if you release the foot brake, the car will creep just like an auto with torque-converter
2. You cannot move the selector from N to D without your foot on the brake - there is a mechanical interlock (because the car would start to move if you could - see point 1)
3. Pulling both steering wheel "buttons" (not optional Left - and Right + paddles) does not select N. With this version you can only go in to N using the hand selector.
4. The pick up in 1 is instantaneous (suggesting the clutch is engaged) and if you right-foot brake, then the car is already rolling by the time your right foot is on the throttle
HTH
Some previous posts appear to have been written by people without first-hand experience of PDK so it may be worth clarifying!
(I am referring to 2008 and on PDK on a 997.2. I believe this is the first generation of PDK.)
1. When in D, if you release the foot brake, the car will creep just like an auto with torque-converter
2. You cannot move the selector from N to D without your foot on the brake - there is a mechanical interlock (because the car would start to move if you could - see point 1)
3. Pulling both steering wheel "buttons" (not optional Left - and Right + paddles) does not select N. With this version you can only go in to N using the hand selector.
4. The pick up in 1 is instantaneous (suggesting the clutch is engaged) and if you right-foot brake, then the car is already rolling by the time your right foot is on the throttle
HTH
NicD said:
I explained two reasons, here is a third. I can detect the engine speed drop slightly after the load is removed from the shift to neutral.
what is your source or expertise for your assertion?
Of course you can move the selector to N when stationary at the lights if you want to - just as you can with any automatic. It's just not necessary. Porsche says leave it in D. what is your source or expertise for your assertion?
http://www.porscheownersmanuals.com/2012-911-carre...
I owned a Turbo S for 3 years and currently have a Boxster S with a GT3 on order.
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