GT Class

[Mirek]

That's true what You say. I believe it's Porsche itself who keeps Cayman artificially "under" 911 level because of the almost legendary status of 911.

[Jarek Z]

Some attempts with Porsche Cayman were also made in Italy, but it was before the new R-GT rules were introduced by the FIA.
Here's Aldo Calabrini and Carlo Verdelli on the stages of Rally di Como 2007:



And here's Massimo Pigoli and Max Chiapponi on the stages of Trofeo ACI Como 2007:

[tommeke_B]

Like mousti mentioned it has been driving in Belgium (and small French events) as well.

Here a photo of a fast driver, Pascal Gaban. He did Rallye de Wallonie twice with it, in 2010 and 2011. Pitty there was no real competition for him when he was driving it, it was spectacular to see him with it on the stages. The car itself isn't that interesting IMO, like Mirek said they keep the Cayman below the 911 in terms of prestations. The "handicap" of the engine is too big for the car to be competitive, at least here in Belgium with fast stages that have many junctions followed by long straights... Also, if I remember correctly, the Cayman didn't have the wide rear tyres like the GT3 has, which was another disadvantage.


Photo of Pascal Gaban in 2010, drifting through a fast left corner on a gravel section.

[stefanvv]

That's a beauty. Pity the engine isn't that powerful.

[Jack4688`]

Could an R-GT version be created using the upcoming Cayman GT4 as a base?

[Mirek]

Yes, for sure.

[wildboar]

That's a beauty. Pity the engine isn't that powerful.

I wonder if it would even make a difference for an R-GT? When the engine is less powerful, then the restrictor can be larger. Maybe it is even an advantage then, as the engine could work closer to its optimum?

[Mirek]

Good question. It can be interesting to see how all the pros and cons go against each other. Maybe somebody can have some erudite answer. Anyway don't forget that Cayman with smaller engine is definitely lighter than 911 and therefore would not be allowed same power.

I believe that even with smaller power the lighter and much better balanced Cayman shall be better if it is built from similar components. However I think that it's the problem. R-GTs are basically near stock-cars and while GT3 is a half-racing machine Cayman is not. Maybe the new GT4 will change it.

[stefanvv]

I wonder if it would even make a difference for an R-GT? When the engine is less powerful, then the restrictor can be larger. Maybe it is even an advantage then, as the engine could work closer to its optimum?

Interesting question indeed. I'm not that familiar in this part of the technics, but Your assumption seems reasonable. Always should be better the engine to work as close to it's manufactured parameters and not "choke" it with restrictor stuff, probably the engine would be more "healthy", it's servicing easier and cheaper. Just assumptions anyway.

[OldF]

Maybe the last year introduced 3436 cm3 340 hp Cayman would be suitable for R-GT. The min. weight for cars with cylinder volumes between 3100 cm3 to 4000 cm3 is 1200 kg and if the weight/power ratio is 3,4 kg/hp, the power at min weight would be 353 hp. The weight of the Cayman is 1345 kg. I don’t know if it’s possible to take off 145 kg to get down to the min weight but I think it’s possible to gain more power with mapping. And as wildboar said the Cayman would work closer to the revs what it’s designed for.

In the video that was posted earlier, Chris Harris says (at 5:35) that the Tuthill Porsche has 350 hp with a 39 mm restrictor (if my old ears heard it correctly).

Chris Harris driving the Tuthill 997 RGT, with a short interview with Richard Tuthill:
https://www.youtube.com/watch?v=V7afNZsAvqI


Cayman

http://www.porsche.com/international...turesandspecs/

or

2014 Porsche Cayman GTS
How long? 4404 mm
How heavy? 1345 kg
What size engine? 3.4 litre, 3436 cm3
How many cylinders? 6, Straight
How much power?
340 PS / 335 bhp / 250 kW @ 7400 rpm
How much torque?
380 Nm / 280 ft.lb / 38.8 kgm @ 4750-5800 rpm
http://www.carfolio.com/specificatio...ar/?car=365167

3,8 l & 4,0 l 997

2011 Porsche 911 GT3 RS 4.0 997
How long? 4460 mm
How heavy? 1435 kg
What size engine? 4 litre, 3996 cm3
How many cylinders? 6, flat
How much power?
500 PS / 493 bhp / 368 kW @ 8250 rpm
How much torque?
460 Nm / 339 ft.lb / 46.9 kgm @ 5750 rpm
http://www.carfolio.com/specificatio...ar/?car=241164

2010 Porsche 911 Carrera GTS Coupé 997
How long? 4435 mm
How heavy? 1420 kg
What size engine? 3.8 litre, 3800 cm3
How many cylinders? 6, Flat
How much power?
408 PS / 402 bhp / 300 kW @ 7300 rpm
How much torque?
420 Nm / 310 ft.lb / 42.8 kgm @ 4200-5600 rpm
http://www.carfolio.com/specificatio...ar/?car=220099