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Electric Cayman - GT4 ePerformance

Aye Jeff, impressive indeed from the McMurtry ... must be PDK and no need for dual zone A/C [;)] :ROFLMAO:

An appropriate `title` sponsor ... [:D]

Perhaps all these new electric developments will kickstart some `proper` Green Energy development to `fuel` them :rolleyes:

 
Sporting the massive fan I’m surprised that someone like Dyson or Vax haven’t jumped in with a sponsorship deal Andrew! It would make an interesting road sweeper. 😀

Agree with your last comment. 👍

Jeff

 
I must say that the more we see of these cars, the more the concept of an electric Cayman appeals as an addition to the range. I certainly think I could enjoy a track day or spirited cross country run in something like that, whilst keeping the ICE version for the Sunday morning pub and club runs. A matching pair would be ideal - an electric Cayman and an ICE Boxster Spyder (please excuse the heresy!) would make a pretty good garage I think.

 
JohnCRS said:
I must say that the more we see of these cars, the more the concept of an electric Cayman appeals as an addition to the range. I certainly think I could enjoy a track day or spirited cross country run in something like that, whilst keeping the ICE version for the Sunday morning pub and club runs. A matching pair would be ideal - an electric Cayman and an ICE Boxster Spyder (please excuse the heresy!) would make a pretty good garage I think.
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Nah ... until EV`s can do this Travis Pastrana' 860HP Subaru GL Wagon Gymkhana 2022 Car w/ Active Aero driven FLATOUT at Goodwood! - YouTube I`m out !

 
While the speed of the electric cars at Goodwood was awesome, particularly the McMurty, the just remind me too much of Scalextric cars so I have to agree with Andrew that the ICE cars were more exciting, particularly the Subaru in the link he posted.

 
Andrew,

I think for drama and aural excitement you just can’t beat the ICE cars …. loved the Scooby with its little air brakes popping-up, and you have to hand it to Adam Smalley in the Porsche GT3 Cup car for his minor off-road excursions; plus I’d forgotten just how fast the Jaguar XJR-12D was (I last saw it back in the day at Le Mans 1990!).

But, you’ve got to admire the off-the-line performance and sheer pace of the electric cars which, although they look as though they’re on rails, aren’t. And I just can’t shake off the image of the McMurtry Spéirling with its two fans spooled-up blasting off the line like a scolded cat* and then whizzing up the hill - corners and all - at eye-watering speeds, and an astonishing 6.5secs faster than the electric GT4 for an average speed of about 108mph. What a fantastic concept and piece of engineering from the small British outfit who it seems are planning to make it road legal. 😲 https://mcmurtry.com/about-us/

Jeff

*Footnote: Apparently the fans produce about 2-tons of downforce; about the same as an F1 car … but at zero-mph!

 
One irony of the Goodwood coverage was that Adam Smalley in the GT3 spent more time on the grass than Jenson Button in a rallycross car 🙂.

Now a question for you technical experts, if the McMurty has 2 tons of downforce at standstill what effect does that have on a standing start, and is that any different to a 2 ton car of the same power? 🤔

 
AndrewT said:
One irony of the Goodwood coverage was that Adam Smalley in the GT3 spent more time on the grass than Jenson Button in a rallycross car 🙂.

Now a question for you technical experts, if the McMurty has 2 tons of downforce at standstill what effect does that have on a standing start, and is that any different to a 2 ton car of the same power? 🤔
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Yes Andrew, and the GT3 was really impressive off the line too with its wailing flat-6!

The McMurty’s 2-tons of downforce makes a huge difference. Remember that’s in addition to the static weight of the car … about 1-ton. It’s only rear wheel drive (unlike the electric GT4, etc.) so the massive downforce is critical to getting the car off the line, utilising the electric motors’ huge zero-speed torque.

Jeff

 
AndrewT said:
...Now a question for you technical experts, if the McMurty has 2 tons of downforce at standstill what effect does that have on a standing start, and is that any different to a 2 ton car of the same power? 🤔
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To expand on Motorhead's contribution above, in effect you have 3 tonnes of downforce (vehicle + fan generated), but crucially only 1 tonne of mass.

So the inertia that the motors have to overcome is that of a 1 tonne vehicle but the available grip is that relating to a 3 tonnes.

(I've taken a few liberties with the physics! But the essence is that there is less inertia so it will accelerate much quicker and also corner more quickly given the available grip).

 
3 tonnes downwards for grip, but only 1 tonne for the power to propel forwards. No additional drag. I would not want to be passed by one if I was on a bike or a pedestrian. Seeing the dust 'wake' that the thing produced and imagine the broken surfaces of many of our roads. I would think the car would be challenged to survive the shot blasting it would get.

I am a petrolhead like others above who want to retain all the drama and noise of the ICE cars. If I had to simply choose between the GT4 RS and the GT4 E-Performance it would have to be the RS. But if someone said that I could have the RS but not not drive it - use the E instead, I suspect I would find a lot of things to like about it and to enjoy it. Hopefully we can get the best of both worlds.

Of course I also hope that bio-fuels and hydrogen power etc. will provide further options.

 
A 150mph+ road sweeper! What’s not to like John, unless you’re battling in its wake of course? 😀

Incidentally, the Spéirling isn’t the only fan-assisted downforce car around currently. Don’t forget the Gordon Murray Automotive T.50 has a ground-effect fan fitted at the rear … that’s in addition to a 3.9L n/a V-12 engine with an astonishing rev-limit of 12,100rpm. 😲

Jeff

 
Apologies to AndrewCS for staying slightly off-topic but here’s an interesting bit of tech background on the McMurtry:

https://youtu.be/MyDORcYkX7g

I was surprised to learn that only a square metre of vacuum area is required to produce so much downforce and also that their first test vehicle was an old ambulance! 😲

Jeff

 
JohnCRS said:
3 tonnes downwards for grip, but only 1 tonne for the power to propel forwards. No additional drag. I would not want to be passed by one if I was on a bike or a pedestrian. Seeing the dust 'wake' that the thing produced and imagine the broken surfaces of many of our roads. I would think the car would be challenged to survive the shot blasting it would get.

I am a petrolhead like others above who want to retain all the drama and noise of the ICE cars. If I had to simply choose between the GT4 RS and the GT4 E-Performance it would have to be the RS. But if someone said that I could have the RS but not not drive it - use the E instead, I suspect I would find a lot of things to like about it and to enjoy it. Hopefully we can get the best of both worlds.

Of course I also hope that bio-fuels and hydrogen power etc. will provide further options.
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I don't doubt the technology and performance of these cars. However, it seems that the only proverbial carrot that the car manufacturers of electric cars can sell is performance? Put it another way, would anyone be even remotely interested if said electric sports car had 200-300 hp..? Specifically with sports cars, if you remove the sound, the gear change interaction, whether its manual or PDK, you've lost at least 50% of the reason to have a sports car. And really, what is the point of 2000hp van..?

I was at the Porsche Pageant at Nottingham last Sunday - and just to see and hear the different sounds of the cars rolling in was wonderful. What differentiates one electric car to another..? Sound wise, nothing.! I really hope that the answer is with eFuels, certainly in my opinion, for the sports cars sake..

Can you imagine going to Goodwood with everything being electric..? It would be like watching giant RC cars going up the hill. I remember when I first went to Goodwood, and saw the F1 V10 BMW going up the hill, the sound was amazing..the hairs on the back of my neck stood up..

It's just my opinion of course, but if this is the future of sports car, I'm bugging out..However, there is hope, I read recently that certain countries in Europe are kicking back on the ICE termination date of 2035 to 2040 - and the EU has given a reprieve on eFuels, (which Porsche is spearheading eFuels) providing they can meet/prove the conditions for zero CO2 emissions - which, given the manufacturing process and charging via none renewables, I doubt electric cars can.? I think electric cars have a place, but not as a sports car..

Ok, which one would you rather watch - McMurtry Speirling or Nick Heidfelds F1 run..?

Speed isn't everything..

 
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