Cayman GT4 Is it quick enough?
Discussion
Steve Rance said:
Generally speaking high Revving engines are very expensive to build as they rely on a very strong bottom end. The Metz was a huge chunk of the cost of the 996/7 GT ranges. No doubt completely over the top as far as VW are concerned. Difficult trade off.
That's an interesting angle that I had not realised.Its cheaper to build a less peaky engine then? i.e; you don't need such a high quality of components?
I think the fully optimum solution to this first world conundrum is clearly a bit of light tuning to liberate another 30 or 40 BHP along with a bit more top end enthusiasm. The base engine is clearly up to scratch so it's intake system for more breathing, possibly but not necessarily an exhaust and a thorough remap. It's a long time to wait for the Porsche warranty to expire!
mollytherocker said:
lemmingjames said:
See Honda S2000 or the CTR/DC5 then?
The S2000 engine is nuts! I love it. Its almost F1 screamy!Lovely chassis too....
mollytherocker said:
bigmowley said:
It's a dreadful chassis that lets go so sharply at the back that it's almost impossible to drive at the limit. Not my cup of tea.
Its excessively oversteery, and thats a good thing!bigmowley said:
No it's not if you cannot hold it, balance it with the throttle and bring it back without any drama. I always managed to catch the S2000 but it usually involved much sawing away at the steering and a nasty mark in my pants.
Er....sounds like fun to me! Do you not like driving!You can fit the power kit if you wish but it's £1000's and I do mean £1000's
The GT4 has the Cayman 74MM throttle body !!!!
The 991 3.8 has a 82MM throttle body, :-)
If one wants 415bhp you fit a 82mm throttle body to the GT4 some sports manifolds and get a remap, it's all quite simple.
If you want it to rev even more you can fit the x51 engine parts which open it up at the top end.
or you can go with a 4.0L kit for about £13k (guess at 435bhp) or the whole 4.0l big bore + X51 (guess at 450bhp) kit for about £20k
It's not magic beans !!!!
MrD out !
PS my Spyder wheels go straight onto my GT4 so drops the ratio's (in real money as over all they are smaller dia)and gives less grip 235/265 from 245/295, the GT4 is quick enough, the issue is the tyre footprint, long gearing and new chassis is too good for the 385BHp.
SO while the car is quick it's feels under powered for the set up. (an M3 v8 has circa 430BHp(don't quote me) and only 235/265 tyres with no weight over the rears)
So you have 2 routes, add power or take away grip. of course if you have PCCB's you cannot down size wheels so you are a bit screwed on options.
I'll not be posting again, just thought I would put some info on here as you guys go round and round in circles. :-)
The GT4 has the Cayman 74MM throttle body !!!!
The 991 3.8 has a 82MM throttle body, :-)
If one wants 415bhp you fit a 82mm throttle body to the GT4 some sports manifolds and get a remap, it's all quite simple.
If you want it to rev even more you can fit the x51 engine parts which open it up at the top end.
or you can go with a 4.0L kit for about £13k (guess at 435bhp) or the whole 4.0l big bore + X51 (guess at 450bhp) kit for about £20k
It's not magic beans !!!!
MrD out !
PS my Spyder wheels go straight onto my GT4 so drops the ratio's (in real money as over all they are smaller dia)and gives less grip 235/265 from 245/295, the GT4 is quick enough, the issue is the tyre footprint, long gearing and new chassis is too good for the 385BHp.
SO while the car is quick it's feels under powered for the set up. (an M3 v8 has circa 430BHp(don't quote me) and only 235/265 tyres with no weight over the rears)
So you have 2 routes, add power or take away grip. of course if you have PCCB's you cannot down size wheels so you are a bit screwed on options.
I'll not be posting again, just thought I would put some info on here as you guys go round and round in circles. :-)
anonymous said:
[redacted]
Genuine question - I know there's lots of talk about the gearing being too long and that this is an issue - are you saying they did this on purpose and they could have just as easily made it shorter , but chose not to ? I guess another thought is this : did they choose to do this as they got a benefit elsewhere by doing it ? I suppose I just don't understand why they choose to build it like this ? 
RSVP911 said:
Genuine question - I know there's lots of talk about the gearing being too long and that this is an issue - are you saying they did this on purpose and they could have just as easily made it shorter , but chose not to ? I guess another Thought is this : did they choose to do this as they got a benefit elsewhere by doing it ? I suppose I just don't understand why they choose to build it like this ?
I believe it all comes down to emissions testing and rating.RSVP911 said:
Ah ha , I see , thanks .
In the real world is it really a problem - I've only ever driven one briefly and it didn't bother me - but in truth , I haven't had enough time in one to really assess
For the average owner, its no problem at all. Apologies if that sounds patronising, its not meant to be.In the real world is it really a problem - I've only ever driven one briefly and it didn't bother me - but in truth , I haven't had enough time in one to really assess
Its only a frustration if you want to maximise the times you can ring its neck near to the red line.
mollytherocker said:
For the average owner, its no problem at all. Apologies if that sounds patronising, its not meant to be.
Its only a frustration if you want to maximise the times you can ring its neck near to the red line.
Not a problem Its only a frustration if you want to maximise the times you can ring its neck near to the red line.
Sounds like a dangerous thing to do in the real world , on real roads and as such maybe it's fine.
bigmowley said:
mollytherocker said:
bigmowley said:
It's a dreadful chassis that lets go so sharply at the back that it's almost impossible to drive at the limit. Not my cup of tea.
Its excessively oversteery, and thats a good thing!Though TBH, if the backend starts to see saw when im driving my 6-3, im normally leaving stains as well followed by a nervous laughter
Forget the 911 "power kit" type options. Whatever we do has to be bespoke to the Cayman due to the compact nature of the install esp on the intake side. There should be no need to delve inside the engine, the cost benefit ratio goes out of the window at that point. A properly developed intake, with a big throttle body along with a retuned exhaust to match and a thorough remap will be just right. It's not the work of a moment as there will be much work avoid any holes in the torque curve, not easy on these engines, hence the very complex standard variable geometry intake system. But on the plus side the variable valve timing is nice and adjustable. The standard engine cover may need to be "adjusted" as it's mighty tight under there.
Once someone has done the development work it should all be bolt on and enjoy a 420BHP GT4.
Once someone has done the development work it should all be bolt on and enjoy a 420BHP GT4.
bigmowley said:
Forget the 911 "power kit" type options. Whatever we do has to be bespoke to the Cayman due to the compact nature of the install esp on the intake side. There should be no need to delve inside the engine, the cost benefit ratio goes out of the window at that point. A properly developed intake, with a big throttle body along with a retuned exhaust to match and a thorough remap will be just right. It's not the work of a moment as there will be much work avoid any holes in the torque curve, not easy on these engines, hence the very complex standard variable geometry intake system. But on the plus side the variable valve timing is nice and adjustable. The standard engine cover may need to be "adjusted" as it's mighty tight under there.
Once someone has done the development work it should all be bolt on and enjoy a 420BHP GT4.
.... which might make it 'feel' faster for all of 10 minutes....Once someone has done the development work it should all be bolt on and enjoy a 420BHP GT4.
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