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Cayman GT4: Where are we up 2 now? Déjà vu Edition

Perhaps it is because they don’t want to admit it is just the same 3.8l engine with modified intake manifold and camshaft Generating a bit more power at the top end - torque curve is on Rennlist.

my alternative theory is that it is the 4 litre crank case with liners and a crank to produce 3.8 litres. Then Porsche meets homologation requirements if if sells a 4.0litre version to produce similar power with full cats GPF on the road.

 
ralphmusic said:
Jeff,

I think our views on the manual box are probably coloured by the 3rd gear failures, the cause of which was gear/shaft attachment rather than a fundamental gearbox torque limit. One has to think/hope all OEMs would run with over engine power spec drive train components, else there would be endless warranty claims and for Porsche, restrictions on track use.
Click to expand...

Actually Ralph, although I was aware of the failures that wasn't my primary thought; and I think Getrag rectified the problem by reverting to the original design. Not having any data to hand I was just musing about the torque capacity of the manual transmission. I'm sure that it's more than sufficient and I think a torque-limiting device was incorporated in the clutch of the 981 GT4, so I assume that would be carried over to the 718.

Hacks and forum warriors....don't you just love 'em..!

Jeff

 
My head hurts
surrender.gif


 
Mine too....I've just had a look at the Rennlist site! What are they smoking over there..?

They seem to be taking as gospel what Porsche's head of GT Customer Motorsports, Matthias Scholz, allegedly said to the R&T reporter that the 3.8L engine is only for the race car (Ralph's post #621), leaving open the possibility that the road car could have a different engine.

So here we go again..! I'd hoped that things would settle down after the race car's announcement but it seems we'll still have to endure more forum flack.[:(]

Jeff

 
At least the race car looks to be quick out of the box in qualifying, so carry-over from the 981 car appears to be paying off:

http://results.imsa.com/Results/19_2019/01_Daytona%20International%20Speedway/02_IMSA%20Michelin%20Pilot%20Challenge/201901040945_Session%201/03_Results_Session%201.PDF

http://results.imsa.com/Results/19_2019/01_Daytona%20International%20Speedway/02_IMSA%20Michelin%20Pilot%20Challenge/201901041415_Session%202/03_Results_Session%202.PDF

I have to say that Porsche's own yellow and black colour scheme looks the business although I guess the race cars will be based upon a white body.

Jeff

 
Ralph,

Is the #77 car the only 718 GT4 CS running at the ROAR? All the other cars appear to be Manthey-Racing (981?) cars.

Jeff

 
Porsche's head of GT Customer Motorsports, Matthias Scholz, has set the cat among the pidgeons with his comment that the 718 GT4 road car (and presumably the Spyder) will not be powered by the 3.8L engine used in the newly announced race car.

As noted recently, it appears that the GT4 race regs now allow road and race cars to have different engines, so we're back to the question: will the road car also have a 3.8L engine or perhaps a 4.0L engine (I'm discounting an F-4 turbo from the evidence I've seen to date)? Only time will tell, and if Porsche are planning to feed back aspects of the race car development into the road car programme we could be in for a considerable wait. However, the additional development time available also means that both manual and PDK transmissions could be on the cards.

Expect more rumour and counter-rumour in the months ahead..!

Jeff

 
The 2018 regulations define Original as "As fitted to the SRO Motorsports Group-approved series-produced car and in compliance with their Technical Form" the latter referring to RACB's document.

So there must be a "series-produced car", mustn't there?

or maybe the 2019 regulations which I can't find are different or the 981 GT4 is still the "series-produced car" for homologation purposes with an engine of the same capacity.

What a puzzle..

 
I think I read that the homologation lasts three years, so the 981 GT4 homologation has now expired. That's why there are none at the ROAR this week, only the new 718 GT4.

The rules require a production car I believe, so there is a road going GT4 on the way and it must turn up this year for the homologation to apply to the current race season. It appears that the engines do not have to be the same any more, so what Matthias Scholz is saying may well be true.

A 4.0ltr NA engine is the most likely I suspect - a basic version of the 991.2 GT3 engine.

 
Twinfan said:
A 4.0ltr NA engine is the most likely I suspect - a basic version of the 991.2 GT3 engine.
Click to expand...

From the production standpoint Dave that would appear to be the most logical approach, both the GT3 and GT4 using what are essentially the same crankcase and block castings but maybe with minor machining differences.

I reckon a lawyer's mentality is required to get your head round the race regs!

Jeff

 
Now they offer a track GT4 CS, is it possible to make it road legal ?

Road cars are really shit on track when you think about it hence I stopped tracking road cars as I found It dull And very expensive and very limiting.

but a proper track GT4 would be a hoot, with proper tyres, brakes, abs adjustemt and some real shocks. Is it possible to make one road legal ?

 
An interesting idea David.

After the initial purchase (from 130,000 Euros + VAT), just like a kit-car I would imagine that as long as it meets the Government's Road Vehicles (Construction and Use) Regulations 1986 it can then be registered for road use. Since presumably it's based upon a road car (contentious issue!)) I suppose it shouldn't be too difficult to satisfy the inspector that the brakes, lights and steering are up to scratch and I would assume that there's an MOT-type emissions test to get through as well which, since the car has cats, I wouldn't think would cause too much of a problem.

I'm sure that's an oversimplification of what's required but if you have bottomless pockets then anything's possible..!

Jeff

 
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