718 Spyder - cylinder deactivation

[Tony B2]

Does anyone actually use this (by keeping stop/start enabled) whilst on motorways, and if so, do you get a noticeable improvement in fuel consumption?

Personally, the awful engine noise that results, together with throttle hesitation mean that I never do.

Just back from Italy via 130kph cruising French autoroutes and 25.9mpg….

Maybe I should have used some earplugs?

[First Sea Lord]

It's not a great noise is it, but I usually put up with it and with the hesitation until one kicks down and reactivates the 6 on longish motorway trips. That regularly translates to 33-35 mpg

I never use it other than in those instances, and turn the music up when it's on

[Tony B2]

First Sea Lord said:

It's not a great noise is it, but I usually put up with it and with the hesitation until one kicks down and reactivates the 6 on longish motorway trips. That regularly translates to 33-35 mpg

I never use it other than in those instances, and turn the music up when it's on

That is a significant improvement (at least compared with mine), but I also wonder about engine wear, due to asymmetric loading of the crankshaft, even though the system does alternate sides (every 30 seconds?)

[bigmowley]

Never used it once on any of mine. Slap it in sport mode get rid of stop start and deactivation and enjoy.
I rather approved of Porsche engineering on that one, drive the car as intended and it doesn’t work, class.
Given the average annual mileage of most Spyders it probably saves about a tenner a year in fuel

[LiamH66]

Tony B2 said:

That is a significant improvement (at least compared with mine), but I also wonder about engine wear, due to asymmetric loading of the crankshaft, even though the system does alternate sides (every 30 seconds?)

At the engine speeds and throttle positions it operates, the loads on the crank from the conrods are so low that assymetry of loading can't really be an issue. But have to agree with everyone that has said it sounds and feels horrible. I've started switching off the "stop-start" on my Cayman GTS 4.0 to stop it annoying me. I think it might be contributing to some driveline shunt in slow moving traffic too, but I also wonder if they bothered calibrating the engine management to suit the manual gearbox. Can't be that many of us now!

Liam

[LBT123456]

Tony B2 said:

Does anyone actually use this (by keeping stop/start enabled) whilst on motorways, and if so, do you get a noticeable improvement in fuel consumption?

Personally, the awful engine noise that results, together with throttle hesitation mean that I never do.

Just back from Italy via 130kph cruising French autoroutes and 25.9mpg….

Maybe I should have used some earplugs?

Cylinder deactivation only works when revs are in the range 1600-2500rpm and engine load < 100Nm, so in the manual it won't trigger above approx 64mph anyway (MT is approx 25 mph/1000rpm in sixth). The noise is horrible, I just use sport+ . CGTS 4.0.

https://media.porsche.com/mediakit/718-gts-4-0-mod...

[Tony B2]

LBT123456 said:

Tony B2 said:

Does anyone actually use this (by keeping stop/start enabled) whilst on motorways, and if so, do you get a noticeable improvement in fuel consumption?

Personally, the awful engine noise that results, together with throttle hesitation mean that I never do.

Just back from Italy via 130kph cruising French autoroutes and 25.9mpg….

Maybe I should have used some earplugs?

Cylinder deactivation only works when revs are in the range 1600-2500rpm and engine load < 100Nm, so in the manual it won't trigger above approx 64mph anyway (MT is approx 25 mph/1000rpm in sixth). The noise is horrible, I just use sport+ . CGTS 4.0.

https://media.porsche.com/mediakit/718-gts-4-0-mod...

Thanks for the link which makes for interesting reading.

Is there a similar link for GT4/Spyder models?

[LBT123456]

Tony B2 said:

Thanks for the link which makes for interesting reading.

Is there a similar link for GT4/Spyder models?

It's the same engine in GTS, GT4, Spyder.

Quote from the words in the link:
".. It benefits from technology and numerous developments that also reduce fuel consumption and exhaust emissions in the 718 Spyder and 718 Cayman GT4, such as adaptive cylinder control. Between 1,600 and 2,500 rpm, and with a load demand of up to a maximum torque of 100 Nm..."

[Tony B2]

LBT123456 said:

Tony B2 said:

Thanks for the link which makes for interesting reading.

Is there a similar link for GT4/Spyder models?

It's the same engine in GTS, GT4, Spyder.

Quote from the words in the link:
".. It benefits from technology and numerous developments that also reduce fuel consumption and exhaust emissions in the 718 Spyder and 718 Cayman GT4, such as adaptive cylinder control. Between 1,600 and 2,500 rpm, and with a load demand of up to a maximum torque of 100 Nm..."

Understood, on the engine stuff - just wondering if there is anything on the chassis/suspension, which would be GT4/Spyder-specific

[LBT123456]

Tony B2 said:

Understood, on the engine stuff - just wondering if there is anything on the chassis/suspension, which would be GT4/Spyder-specific

Ah right, yes this one gives a bit more details on the suspension upgrades over the standard 718: https://newsroom.porsche.com/en/press-kits/718-spy...

[scrounger73]

I always turn off stop/start so never use the cylinder deactivation. Re fuel consumption, after a 250 mile trip to Norfolk yesterday I averaged 35.3mpg and let's just say I wasn't tickling the loud pedal!