Cayman GT4: Where are we up to now?
- Thread starter Motorhead
- Start date
dpoynton said:
David,
There's been some conjecture on another thread here as to whether or not the GT4 Mk2 will still be normally apspirated or turbocharged given that the GTS will have the flat-4 turbo engine with an even higher state of tune. At some point I seem to recall AP saying that the GT cars - and by inference the GT4 - will remain n/a for the time being, so I'm guessing at least until the 991/981/718 replacements come along in 4 or 5 years time.
Quite what engine will feature in the GT4 remains open to question since presumably the lines will be given over primarily to 4 and 6-cylinder turbo engine production. I can't see Porsche stockpiling n/a 3.8L engines for eventual GT4 Mk2 production, although spare engines will be required of course, so I'm assuming that a line will still be available for GT3 and GT4 engine production since there's a high degree of commonality between their engines, not least the bore and stroke dimensions. There's very little chance that we'll see the GT3 engine in the GT4 though.
In order to keep the GT4 above the GTS in the pecking order we'll have to assume that the flat-6 3.8L will have to receive a mild power hike as well, which shouldn't prove problematic given that the current car's performance has been reined in by the Porsche engine tuners.
Jeff
spyderwhite
Member
The gt4 and gt3 engines have very little in common .The current 3.8 in the gt4 will need more than a mild power hike to keep it ahead of the f4 2.5 turbos. The 9A1 3.8 engine must now be defunct now its not shared with the 911(991) so it will need either a detuned 991 gt3 rs na engine which will make it expensive (what other na f6 could they use)or to keep the price down a 425hp version of the 2.5 turbo!
In defense of the 9A1 engine, it is now introduced into racing, and more importantly can/is producing up to 450PS in modified Caymans with Powerkit parts. I think 4.0 will replace 3.8 in GT3s so still headroom within 9x1 platform. Pretty well all of the tooling will have been fully amortised and in modern manufacturing processes they can interlace 9A1 and new turbo engines on the same line. Also I guess the 'real' Turbos still use the 9A1 type engine.
I would like to buy an indoor cover for mine. The Porsche one looks fine but I remember seeing a smart, nicely fitted two-tone job on the forums but cannot locate/remember it now.
Can anyone help, please?
Can anyone help, please?
There is an unofficial North American register for anyone interested the popularity of various options and numbers of cars. See
[link=https://docs.google.com/spreadsheets/d/1hr3SxleOGreVhYbGa0OAV3DESGXWUN2fjaRtTuXIkEw/edit#gid=251833504]https://docs.google.com/s...kEw/edit#gid=251833504[/link]
[link=https://docs.google.com/spreadsheets/d/1hr3SxleOGreVhYbGa0OAV3DESGXWUN2fjaRtTuXIkEw/edit#gid=251833504]https://docs.google.com/s...kEw/edit#gid=251833504[/link]
spyderwhite said:
Granted, at component level (crank, conrods, pistons, valve gear, etc.) which is just engine assembly. But I was refering to manufacture where bores and bore centres are important in the manufacture of the core engine (block, crankcase and cylinder head). As Ralph says, there's still plenty of scope in the 9A1 engine.
Jeff
PS: Chris, I'd like to think you're right but somehow I can't think that a GT3-engined GT4 would sit well with the Porsche planners.
ralphmusic said:
That's a very comprehensive breakdown Ralph.
I'm rather surprised that Yellow is the third colour choice, with White taking a comfortable lead ahead of Saphire Blue (another surprise).
A lot of LWBs and Sports Chrono (indicating potential track use?) but the Clubsport option doesn't appear on the list. Not many taking up the A/C delete or sticking with the smaller fuel tank though.
Jeff
Jeff,
I don't think Clubsport was a option in the USA, a cause of much moaning and groaning but as always, there are a number of third-party options from harness bars to full cages.
[link=http://rennlist.com/forums/gt4/912208-best-harness-roll-bar-group-buy.html]http://rennlist.com/forums/gt4/912208-best-harness-roll-bar-group-buy.html[/link]
Ralph
I don't think Clubsport was a option in the USA, a cause of much moaning and groaning but as always, there are a number of third-party options from harness bars to full cages.
[link=http://rennlist.com/forums/gt4/912208-best-harness-roll-bar-group-buy.html]http://rennlist.com/forums/gt4/912208-best-harness-roll-bar-group-buy.html[/link]
Ralph
not many people want CS spec, my OPC only sold one CS car vs 7 normal cars. CS spec creaks and bangs, and it's only a road car, it would do my head in, people already moaning on forums about noise coming from the cage, I don't get why any one would want it and also adding high up weight which is never a good thing.
You can do track days without a harness, I always do, as do 95% of cars on track days, they are only track days.
Take a look at 991 GT3 sales forget CS pack, you cannot even find a car for sale with buckets on 90% of those for sale.
So my take is you can stick CS where the sun don't shine ;-) at it seems 90% of buyers feel the same.
CS pack seems to be a car forum thing, or dare I say it the hype on PH saying CS pack is the car for resale/flippers esp in white lol !
while the rest of us are just enjoying our quite cars day to day
You can do track days without a harness, I always do, as do 95% of cars on track days, they are only track days.
Take a look at 991 GT3 sales forget CS pack, you cannot even find a car for sale with buckets on 90% of those for sale.
So my take is you can stick CS where the sun don't shine ;-) at it seems 90% of buyers feel the same.
CS pack seems to be a car forum thing, or dare I say it the hype on PH saying CS pack is the car for resale/flippers esp in white lol !
while the rest of us are just enjoying our quite cars day to day
spyderwhite
Member
Motorhead said:
i believe that the crankcase was also modified on the Gt3. The 9a1 has been replaced by the 9a2 and currently you have a choice f4 turbo in either 2.0 litre or 2.5 litre and 3.0 litre f6. On top of that there is the 4.0 RS engine which was all new over the 991 gt3 and I presume will carry over to next gt3.
After June this year the current 9a1 which is still being manufactured for the Cayman Gts and gt4 will cease to exist. So what engine will the next gen of NA flat 6 will the gt4 or 4 RS use i cannot see porsche making a one off capacity for these cars they will use what exists unless they turn the f4 2.5 into a NA f6 3.75 litre or increase the bore of the 3.0 litre which would be the same as and use in the gt4 and share with the 991.2 Gts but surely it will be slower at 450 hp to the current 991.2s.
spyderwhite
Member
Do we think a gt4rs will be built in the current 981 shape if so then they only have to june so I don't think so,so it will be in the 718 design which doesn't hit the market in Cayman form until late this year,and if there is to be gt4.2 surely the 991.2 gt3 will be built first making a gt4.2 at least 2 years away so by then they may have to use the turbo lump!
AP said GT cars will remain NA for now/ near future( can't remember the exact words)back in early 2015 but that could all change by the end of this year if not already!
AP said GT cars will remain NA for now/ near future( can't remember the exact words)back in early 2015 but that could all change by the end of this year if not already!
the market is again now open now the 718 is faster than the hyped up Gt4
So we could see a GT4 RS, but we are all waiting for Feb to get the low down on the 911R atm. but it does seem like 35 UK cars and big money model !
very annoying market !! I would love a 420BHp GT4 RS in NA form, but won't sell mine as I don't want a GT4 turbo.
I have not heard of any RS model and I have known about the 911 R for way over 6 months, so not looking good regarding the GT4 RS any time soon.
So we could see a GT4 RS, but we are all waiting for Feb to get the low down on the 911R atm. but it does seem like 35 UK cars and big money model !
very annoying market !! I would love a 420BHp GT4 RS in NA form, but won't sell mine as I don't want a GT4 turbo.
I have not heard of any RS model and I have known about the 911 R for way over 6 months, so not looking good regarding the GT4 RS any time soon.
spyder, as far as I know all 9A1 versions share the same basic block and crankcase (Alusil?) castings but with some mods. For instance, the 991 3.8L engine had to be modified externally for it to fit in the Cayman engine bay and it's quite likely that there are minor differences between the Carrera, Turbo and GT3 castings. Don't forget that the 991 Turbo is still soldiering on with the 9A1 engine.
Here are a couple of interesting technical comparisons between the 9A1 and 9A2 engines:
[link=http://rennlist.com/forums/991/893221-991-2-9a2-engine-vs-9a1-technical-analysis.html]http://rennlist.com/forums/991/893221-991-2-9a2-engine-vs-9a1-technical-analysis.html[/link]
[link=http://blog.caranddriver.com/tech-dive-in-depth-with-the-new-porsche-911-carreras-twin-turbo-flat-six/]http://blog.caranddriver....s-twin-turbo-flat-six/[/link]
As you say, a lot depends upon when Porsche plan to introduce the Mk2 GT4. I'm sure they indicated early on that, unlike the GT3, the GT4 is not intended to be a limited production vehicle - even though events seem to have overtaken them on that count! - so we'll have to wait and see.
D, I have to say that a GT4 RS seems unlikely at the moment...unfortunately.
Jeff
Here are a couple of interesting technical comparisons between the 9A1 and 9A2 engines:
[link=http://rennlist.com/forums/991/893221-991-2-9a2-engine-vs-9a1-technical-analysis.html]http://rennlist.com/forums/991/893221-991-2-9a2-engine-vs-9a1-technical-analysis.html[/link]
[link=http://blog.caranddriver.com/tech-dive-in-depth-with-the-new-porsche-911-carreras-twin-turbo-flat-six/]http://blog.caranddriver....s-twin-turbo-flat-six/[/link]
As you say, a lot depends upon when Porsche plan to introduce the Mk2 GT4. I'm sure they indicated early on that, unlike the GT3, the GT4 is not intended to be a limited production vehicle - even though events seem to have overtaken them on that count! - so we'll have to wait and see.
D, I have to say that a GT4 RS seems unlikely at the moment...unfortunately.
Jeff
Thanks Steve
Your cover looks very nice, ideal.
here did you get it from, please?
Ian
Your cover looks very nice, ideal.
here did you get it from, please?
Ian
(Where) from is what I meant to say!
MrDemon said:not many people want CS spec, my OPC only sold one CS car vs 7 normal cars. CS spec creaks and bangs, and it's only a road car, it would do my head in, people already moaning on forums about noise coming from the cage, I don't get why any one would want it and also adding high up weight which is never a good thing.
You can do track days without a harness, I always do, as do 95% of cars on track days, they are only track days.
Take a look at 991 GT3 sales forget CS pack, you cannot even find a car for sale with buckets on 90% of those for sale.
So my take is you can stick CS where the sun don't shine ;-) at it seems 90% of buyers feel the same.
CS pack seems to be a car forum thing, or dare I say it the hype on PH saying CS pack is the car for resale/flippers esp in white lol !
while the rest of us are just enjoying our quite cars day to day
I'm surprised that everybody hasn't gone for a car just like yours ...
I would probably have kept my Cayman R had it not been for the Clubsport package with full harnesses also for the passenger.
I also have passengers who insist on using their Hans device, --- which I will probably do myself now that the car is run in ---
As always Chris, it's good that we have the choice here of spec'ing the Clubsport package and respect to you for going down that route, although I wouldn't be interested in it myself.
Good to see that your running-in period is over and you can now enjoy the full performance of your car.....handily, just in time for some track days.!
Jeff
Good to see that your running-in period is over and you can now enjoy the full performance of your car.....handily, just in time for some track days.!
Jeff
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