Taycan Turbo GT efficiency

[GTS UK]

Any thoughts on why my Turbo GT is about 15% less efficient than my old GTS (2025)? Both have the exact same sized wheels and weight is similar. Is it purely down to the tyres? Or are things like aero, bigger inverters, active ride all contributing to it being less efficient?

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[W1NGE]

Any thoughts on why my Turbo GT is about 15% less efficient than my old GTS (2025)? Both have the exact same sized wheels and weight is similar. Is it purely down to the tyres? Or are things like aero, bigger inverters, active ride all contributing to it being less efficient?

Higher current 900A rear inverter will use more juice and be the most likely reason.

More powerful variants tend to be less efficient - trade-off.

 

[GTS UK]

No, just the standard Turbo GT

 

[Mr.Smith]

Higher current 900A rear inverter will use more juice and be the most likely reason.

More powerful variants tend to be less efficient - trade-off.

I agree with this.

Plus the aero and the closed off side vents will play a part.

 

[prj]

Any thoughts on why my Turbo GT is about 15% less efficient than my old GTS (2025)? Both have the exact same sized wheels and weight is similar. Is it purely down to the tyres? Or are things like aero, bigger inverters, active ride all contributing to it being less efficient?

Aero, Tyres, Wheels while similar size your old ones were probably Aero, and on the Turbo GT they are Spyder.

 

[WuffvonTrips]

You've now got 32% more drag than your GTS (which I assume was close to the 0.22 quoted for other j1.1s)-

"The Taycan Turbo GT has a drag coefficient (cw) of 0.29.

The Taycan Turbo GT with Weissach Package has a drag coefficient (cw) of 0.31."

(from https://newsroom.porsche.com/en_AU/...taycan-turbo-gt-product-highlights-37958.html)

 

[prj]

You've now got 32% more drag than your GTS (which I assume was close to the 0.22 quoted for other j1.1s)-

"The Taycan Turbo GT has a drag coefficient (cw) of 0.29.

The Taycan Turbo GT with Weissach Package has a drag coefficient (cw) of 0.31."

(from https://newsroom.porsche.com/en_AU/...taycan-turbo-gt-product-highlights-37958.html)

That is not how drag coefficients work.
Drag is coefficient times frontal area, and you do not have that information.

That is why even though the e-tron GT has a higher coefficient than the Taycan, the overall drag is less and the car more efficient.

 

[WuffvonTrips]

That is not how drag coefficients work.
Drag is coefficient times frontal area, and you do not have that information.

That is why even though the e-tron GT has a higher coefficient than the Taycan, the overall drag is less and the car more efficient.

I'm quite aware of that (from working on aircraft simulation models).
You think that a Taycan GT has a significantly smaller frontal (or "wetted") area than a Taycan GTS?

 

[GTS UK]

On my daily journey to work which is about 10 miles and average under 40mph, so aero won’t be a big factor the car is about 20% less efficient than my old 2025 GTS with 21 spider rims . I’m guessing tyres / bigger inverter are the culprits (tyres are P Zero R and GTS tyres where Goodyear F1). I wasn’t really expecting much reduction in range to be honest but 15-20% is the reality.

 

[prj]

I'm quite aware of that (from working on aircraft simulation models).
You think that a Taycan GT has a significantly smaller frontal (or "wetted") area than a Taycan GTS?

I think the Taycan GT has a larger frontal area due to the different front bumper.

The CD on the turbo variants is also worse than on the GTS.
Add to that high performance tyres with more rolling resistance, and the fact that the Turbo GT inverter might be less efficient.

On my daily journey to work which is about 10 miles and average under 40mph, so aero won’t be a big factor the car is about 20% less efficient than my old 2025 GTS with 21 spider rims . I’m guessing tyres / bigger inverter are the culprits (tyres are P Zero R and GTS tyres where Goodyear F1). I wasn’t really expecting much reduction in range to be honest but 15-20% is the reality.

If you're running the car in "Sport" then the Turbo GT will stay in first gear to 100km/h. Whereas the GTS will shift to 2nd much earlier.
Try running it in normal mode, so it is always in 2nd gear.

If you are already running it in normal, well then see the reasons above.

 

[WuffvonTrips]

I think the Taycan GT has a larger frontal area due to the different front bumper.

I think that's a reasonable assumption...so why are you taking issue with me saying that the GT has 32% more drag than the GTS? Would you prefer me to say that it has at least 32% more drag (at the same speed of course...or should I say velocity if we want to get picky)?

 

[prj]

I think that's a reasonable assumption...so why are you taking issue with me saying that the GT has 32% more drag than the GTS? Would you prefer me to say that it has at least 32% more drag (at the same speed of course...or should I say velocity if we want to get picky)?

That would be correct, yes.
It's just quoting the CD number and saying that's the difference in drag is that percentage is misleading. The difference in drag has to be larger than the 32%, because not only is the CD larger but the front area as well.

 

[prj]

For actual numbers:
Taycan GTS with Turbo Aero wheels:
C/D: 0.22
Frontal area: 2.33m2
CD x Area: 0.513m2

Taycan GTS Sport Turismo:
C/D: 0.25
Frontal area: 2.33m2
CD x Area: 0.583m2

Taycan Turbo GT:
C/D: 0.29
Frontal area: 2.33m2
CD x Area: 0.676 m2

And just as comparison:
Taycan 4S Cross Turismo:
C/D: 0.25
Frontal area: 2.35m2
CD x Area: 0.588 m2

So it seems that Porsche considers the frontal area identical for all Sedan and Sport Turismo variants.
The only one that is given a larger frontal area number is the Cross Turismo. It is interesting to note also that the Turbo and Turbo S Cross Turismo has a C/D of 0.26, so the Turbo style bumpers are less efficient.

In this case 32% number is correct when comparing a GTS sedan to a Turbo GT sedan, because it seems Porsche normalized the frontal area.

Interesting to note also that the Sedan has between 13-15% less drag than the CT/ST variants.

 

[Mr.Smith]

For the Weissach I can't get better than 2.2mi/kWh

If I really drive it hard, I'm getting 1.1mi/kWh.

I'm trying to get it under 1mi/kWh

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