Normal PDK behavior?
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From: Miami, FL
Normal PDK behavior?
This is my first car with a PDK so not sure if this is normal behavior or not, but if I'm at a stoplight, and I quickly lift my foot off the brake and stab the throttle, the car will bog down for a fraction of a second before the clutch engages and the car takes off. If I pause ever so slightly after lifting my foot off the brake until I feel the clutch start grabbing, then stab the throttle, all is well. This only happens when I'm NOT in sport mode. I tried the throttle position sensor reset a while ago (turn acc on, wait 60sec, turn off) but I'm not sure it did anything.
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Hard to explain, but this is a partial stab... not foot flat to the floor. Not nearly enough throttle to cause wheel spin and the TC to cut power. The amount of throttle doesn't change anything, it's the speed at which I get off the brake and get on the accelerator. The feeling is akin to someone learning how to drive a manual, and them getting off the clutch too quick and not applying enough gas.
I want to think it's just normal PDK behavior and I'm surprising the TCM with too much throttle too quick, and it knee jerks to dropping the clutch. If I wait just a hair after getting off the brake and roll on the throttle, it does it's usually smooth engagement. With sport mode engaged, I don't notice it bogging when getting on the throttle quickly.
I want to think it's just normal PDK behavior and I'm surprising the TCM with too much throttle too quick, and it knee jerks to dropping the clutch. If I wait just a hair after getting off the brake and roll on the throttle, it does it's usually smooth engagement. With sport mode engaged, I don't notice it bogging when getting on the throttle quickly.
Last edited by drdantheman1; Jun 21, 2021 at 10:03 PM.
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Drifting
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Hard to explain, but this is a partial stab... not foot flat to the floor. Not nearly enough throttle to cause wheel spin and the TC to cut power. The amount of throttle doesn't change anything, it's the speed at which I get off the brake and get on the accelerator. The feeling is akin to someone learning how to drive a manual, and them getting off the clutch too quick and not applying enough gas.
With that said, I could have swore the car did it in sport mode the last time which was a week ago.. I could be wrong on that, but I do know for sure its always been in normal mode before.
The whole motion is awkward, hate the way the car acts and the sounds it makes when this happens. It's not Porsche like IMO.
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You point out the quickness in which you transition from brake to gas.
Many cars now disconnect/disable the throttle pedal when the brake is applied, thanks to Lexus owners stacking new floor mats on their old floor mats and causing "unintended acceleration" or whatever they called it. This is particularly bad in my girlfriend's 2011 Golf TDI w/DSG, leading to a bogging feeling during normal driving in rush hour traffic. Sport mode in that car alleviates it to some degree.
I suspect that this behaviour is disabled in the 911 when in Sport or Sport+ mode?
These comments about "calibrating" the PDK and "resetting" the PDK will lead you down a rabbit hole of largely placebo effect procedures, so be warned. The calibration procedure for a PDK is for the clutches and is initiated through PIWIS or a bidirectional service tablet. The "PDK reset" procedure floating around here for other model Porsches has been denied as a real procedure by numerous Porsche technicians. Of the two procedures referenced, one would think the clutch calibration MIGHT have some kind of effect, but if you're otherwise experiencing proper shifting, it likely won't.
You mention "dropping the clutch" -- the PDK does not do this. It actually slips them harder, at higher revs, if you are aggressive off the line. For example, from a standstill if I floor it, the engine will turn above 3000rpm while slipping the clutches, with full engagement happening somewhere before 4000 RPM. If I hesitate a little and let the car get rolling and then floor it, the clutches are already engaged and it simply piles on the power without slipping the clutch.
Many cars now disconnect/disable the throttle pedal when the brake is applied, thanks to Lexus owners stacking new floor mats on their old floor mats and causing "unintended acceleration" or whatever they called it. This is particularly bad in my girlfriend's 2011 Golf TDI w/DSG, leading to a bogging feeling during normal driving in rush hour traffic. Sport mode in that car alleviates it to some degree.
I suspect that this behaviour is disabled in the 911 when in Sport or Sport+ mode?
These comments about "calibrating" the PDK and "resetting" the PDK will lead you down a rabbit hole of largely placebo effect procedures, so be warned. The calibration procedure for a PDK is for the clutches and is initiated through PIWIS or a bidirectional service tablet. The "PDK reset" procedure floating around here for other model Porsches has been denied as a real procedure by numerous Porsche technicians. Of the two procedures referenced, one would think the clutch calibration MIGHT have some kind of effect, but if you're otherwise experiencing proper shifting, it likely won't.
You mention "dropping the clutch" -- the PDK does not do this. It actually slips them harder, at higher revs, if you are aggressive off the line. For example, from a standstill if I floor it, the engine will turn above 3000rpm while slipping the clutches, with full engagement happening somewhere before 4000 RPM. If I hesitate a little and let the car get rolling and then floor it, the clutches are already engaged and it simply piles on the power without slipping the clutch.
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Hard to explain, but this is a partial stab... not foot flat to the floor. Not nearly enough throttle to cause wheel spin and the TC to cut power. The amount of throttle doesn't change anything, it's the speed at which I get off the brake and get on the accelerator. The feeling is akin to someone learning how to drive a manual, and them getting off the clutch too quick and not applying enough gas.
I want to think it's just normal PDK behavior and I'm surprising the TCM with too much throttle too quick, and it knee jerks to dropping the clutch. If I wait just a hair after getting off the brake and roll on the throttle, it does it's usually smooth engagement. With sport mode engaged, I don't notice it bogging when getting on the throttle quickly.
I want to think it's just normal PDK behavior and I'm surprising the TCM with too much throttle too quick, and it knee jerks to dropping the clutch. If I wait just a hair after getting off the brake and roll on the throttle, it does it's usually smooth engagement. With sport mode engaged, I don't notice it bogging when getting on the throttle quickly.
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Drifting
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Think I've had this happen to me as well. I describe it almost as a " hesitation and buck."
Also had it happen after recalibrating my clutches via Cobb. Though it was early on after the calibration and I don't think I've had it happen since.
One thing I've found that does seem to help, is romping it a few times in every drive. PDK seems to get lazy if you just tootle around a lot. Could be placebo. Over a year ago, I stomped on the gas once and nothing happened. Literally, nothing.
Did some research and started getting on it more when I drive it and I haven't had it happen again.
Also had it happen after recalibrating my clutches via Cobb. Though it was early on after the calibration and I don't think I've had it happen since.
One thing I've found that does seem to help, is romping it a few times in every drive. PDK seems to get lazy if you just tootle around a lot. Could be placebo. Over a year ago, I stomped on the gas once and nothing happened. Literally, nothing.
Did some research and started getting on it more when I drive it and I haven't had it happen again.