[rro]

I'm experiencing significant vibration at low RPMs in my PDK 718 Cayman GTS. Occurs in the 1400-1900 RPM range during slow acceleration / partial throttle in Normal mode. It sounds like a low drone/rumble at first, but then causes the car to vibrate -- thus leading to some rattles in the rear trunk area, and also the rearview mirror area.

Is this normal? I can usually reproduce it when slowly accelerating from 52-56mph in 7th gear.

 

[HooosierDaddy]

try changing the gear it's in, sounds like it's just in too high of a gear for the speed and acceleration rate. Same thing happens in a Manual car, for example taking off in second gear and or you've slowed down and rather than down shifting you just let it lug its way back.

 

[rro]

It does kind of sound like it's lugging, but is this normal for the PDK to let the engine lug like that?

 

[HooosierDaddy]

If your driving habits are such that its learned this behavior, I'd say is very possible. I know there's a way to reset what's it's learned.

 

[jimmuller]

My PDK will sometimes run a very low gear when not in Sport mode.

As for its learning, I don't think it remembers much from trip to trip.

 

[HooosierDaddy]

 

[rro]

I'll have to try this reset procedure once I finish my 2000 mile run-in. Weird that the PDK is allowing this much lugging and vibration. Hard to believe this is "normal" for a new 2018 Porsche.

 

[HooosierDaddy]

I'll have to try this reset procedure once I finish my 2000 mile run-in. Weird that the PDK is allowing this much lugging and vibration. Hard to believe this is "normal" for a new 2018 Porsche.

I say break it in like you stoled it! After 500 miles it’s proven itself! This is just my opinion!

 

[GregW]

My PDK will sometimes run a very low gear when not in Sport mode.

As for its learning, I don't think it remembers much from trip to trip.

Agreed.
There are some comments around that say the PDK will remember your driving style. As far as I've been able to ascertain this learning is only seconds to minutes long--such as when you move from the highway to the twisties and start pushing it, or deliberately shift down when starting a climb.

This is mentioned in the handbook, but I haven't found a Porsche reference to anything longer.

 

[Jack]

Hi
anybody else with this symptom ? Am writing from Italy, I have 718 MY2017, 30.000km with PDK (no PSE, no PASM), I've tried to write also in the Italian forum but I didn't get so much information...
Anyway, to me it happens around 2200 rpm, in every gear (drive or manual it doesn't matter) ... it is a vibration you feel in all the frame of the car during slow acceleration / partial throttle.

Thank you for sharing any updates

 

[highwire_ca]

I'm experiencing significant vibration at low RPMs in my PDK 718 Cayman GTS. Occurs in the 1400-1900 RPM range during slow acceleration / partial throttle in Normal mode. It sounds like a low drone/rumble at first, but then causes the car to vibrate -- thus leading to some rattles in the rear trunk area, and also the rearview mirror area.

Is this normal? I can usually reproduce it when slowly accelerating from 52-56mph in 7th gear.

I bought a CPO Cayman S (early build from 2016) about two years ago, and mine has done exactly this since the day I bought it. I brought it to the attention of the dealer and they told me it is normal - vibration/drone at ~1800rpm. I noticed that the previous owner/dealer put what looks like a velcro "shim" between the metal hatch and the plastic trim that surrounds the rear window - probably to minimize the rattling caused by all that vibration. I have not tried the PDK reset procedure, but I'm going to give it a try.

 

[jonchicoine]

Hi
anybody else with this symptom ? Am writing from Italy, I have 718 MY2017, 30.000km with PDK (no PSE, no PASM), I've tried to write also in the Italian forum but I didn't get so much information...
Anyway, to me it happens around 2200 rpm, in every gear (drive or manual it doesn't matter) ... it is a vibration you feel in all the frame of the car during slow acceleration / partial throttle.

Thank you for sharing any updates

my 2017 Cayman S does the same thing (from they day i got it ... Not very Porsche Like eh ...

 

[GregW]

Hi
anybody else with this symptom ? Am writing from Italy, I have 718 MY2017, 30.000km with PDK (no PSE, no PASM), I've tried to write also in the Italian forum but I didn't get so much information...
Anyway, to me it happens around 2200 rpm, in every gear (drive or manual it doesn't matter) ... it is a vibration you feel in all the frame of the car during slow acceleration / partial throttle.

Thank you for sharing any updates

There is going to be a bit of vibration at lowish revs with throttle for acceleration because of the basic balance and torque configurations of the 4 cylinder turbo. This won't happen (as much) in a NA 6 as the engine has a better dynamic balance and the torque doesn't come on until higher revs.

If it bothers you, drive in Sport mode. 😀

 

[johan]

There is going to be a bit of vibration at lowish revs with throttle for acceleration because of the basic balance and torque configurations of the 4 cylinder turbo. This won't happen (as much) in a NA 6 as the engine has a better dynamic balance and the torque doesn't come on until higher revs.

If it bothers you, drive in Sport mode. 😀

Before i bought my first 718 i have read alot about people complaining that the 4 potter was not as smooth as the 6 potter.
And sure enough my first feel was that it was awful compared to my old 986.
But after i disconnected the sound aktor and i slowly got used to it i cant feel the vibrations anymore.

 

[jimmuller]

Before i bought my first 718 i have read alot about people complaining that the 4 potter was not as smooth as the 6 potter.
And sure enough my first feel was that it was awful compared to my old 986.
But after i disconnected the sound aktor and i slowly got used to it i cant feel the vibrations anymore.

You know, it has been months since anyone mentioned the sound aktor.

Compared to a 6 a 4 will always feel rougher for two key reasons. First, it has only 2/3s as many firings per revolution. That will lower the frequency of firings and the fundamental pitch, making a 4 at 1800rpm sound and feel like a 6 at 1200rpm. You would never run a 6 that slow. Even at higher speeds, you'd have to run a 4 at 6000rpm to make it sound like a 6 at 4000rpm. It's like how eating health food doesn't make you llve longer, it just makes it seem longer. Having two more cylinders doesn't make it spin faster, it just makes it sound faster.

Second, though the inertial loads of the moving parts, crank, conn rods, and pistons, in a flat 4 are completely balanced, the piston motion required to balance it requires that it fire twice on one side, twice on the other. The firing order is 1-3-2-4 (left front, left rear, right front, right rear). The L-L-R-R side-to-side firing is unavoidable, and that's what gives all flat 4's their characteristic sound.

 

[GTSTALKER]

You know, it has been months since anyone mentioned the sound aktor.

Compared to a 6 a 4 will always feel rougher for two key reasons. First, it has only 2/3s as many firings per revolution. That will lower the frequency of firings and the fundamental pitch, making a 4 at 1800rpm sound and feel like a 6 at 1200rpm. You would never run a 6 that slow. Even at higher speeds, you'd have to run a 4 at 6000rpm to make it sound like a 6 at 4000rpm. It's like how eating health food doesn't make you llve longer, it just makes it seem longer. Having two more cylinders doesn't make it spin faster, it just makes it sound faster.

Second, though the inertial loads of the moving parts, crank, conn rods, and pistons, in a flat 4 are completely balanced, the piston motion required to balance it requires that it fire twice on one side, twice on the other. The firing order is 1-3-2-4 (left front, left rear, right front, right rear). The L-L-R-R side-to-side firing is unavoidable, and that's what gives all flat 4's their characteristic sound.

I agree with this. It was one of this first things I noticed but the configuration of the engine will make this just normal NVH associated with the car in low rpms.

 

[johan]

You know, it has been months since anyone mentioned the sound aktor.

Compared to a 6 a 4 will always feel rougher for two key reasons. First, it has only 2/3s as many firings per revolution. That will lower the frequency of firings and the fundamental pitch, making a 4 at 1800rpm sound and feel like a 6 at 1200rpm. You would never run a 6 that slow. Even at higher speeds, you'd have to run a 4 at 6000rpm to make it sound like a 6 at 4000rpm. It's like how eating health food doesn't make you llve longer, it just makes it seem longer. Having two more cylinders doesn't make it spin faster, it just makes it sound faster.

Second, though the inertial loads of the moving parts, crank, conn rods, and pistons, in a flat 4 are completely balanced, the piston motion required to balance it requires that it fire twice on one side, twice on the other. The firing order is 1-3-2-4 (left front, left rear, right front, right rear). The L-L-R-R side-to-side firing is unavoidable, and that's what gives all flat 4's their characteristic sound.

Well it was a couple of years ago i found out that it ads vibrations to the car.

 

[dgkli]

Well it was a couple of years ago i found out that it ads vibrations to the car.

I think it’s worth mentioning from time to time for newcomers (of which I am one, having had my 718 BGTS for just 2 weeks, and having read about, and disabled, the soundaktor on day 2 of ownership): if you are unhappy with the sound/vibration of your 718 f4, seek out the soundaktor thread, where you will learn it takes a total of 30 seconds to disable it by pulling a fuse.

 

[Jack]

how does the soundaktor work ? I mean, I understood it is a device able to create different sound... just a speaker... but I don't understand how it can create vibrations on the frame...

 

[DriveInHouston]

Think of it as a speaker stuck on the firewall behind your back.