Cayman GT4: Where are we up to now?
- Thread starter Motorhead
- Start date
Away from 4 pot love, here is a USA video of GT4 v GT4 Clubsport. Not hugely enlightening but something to watch as the nights draw in...
[link=https://www.youtube.com/watch?v=FM5CmtCSbwM]https://www.youtube.com/watch?v=FM5CmtCSbwM[/link]
[link=https://www.youtube.com/watch?v=FM5CmtCSbwM]https://www.youtube.com/watch?v=FM5CmtCSbwM[/link]
Looking to upgrade your GT4?
You may want to try out Sharkwerks' modifications - shorter 3rd-5th gear ratios, a lighter flywheel, an upgraded LSD, 425bhp plus aero mods. Henry Catchpole seems to like it..!
www.roadandtrack.com/car-culture/videos/a32507/sharkwerks-cayman-gt4/
Jeff
You may want to try out Sharkwerks' modifications - shorter 3rd-5th gear ratios, a lighter flywheel, an upgraded LSD, 425bhp plus aero mods. Henry Catchpole seems to like it..!
www.roadandtrack.com/car-culture/videos/a32507/sharkwerks-cayman-gt4/
Jeff
Not much sharkwerks about it though.
just uses the bigger throttle with the cargraphic manifolds (U.K. Made)and a 3rd party tune. As for catchpole, it's unforgivable given it's his job to say it's a x51 power pack engine.
So what we were doing to gen 1 Caymans back in 2005 Inc the guards diff etc.And what my Spyder was 5 years back.
I also dont get the shorter 3rd gear, 2 gear is the issue imo. Now 3rd just is like 2nd gear, very odd move. Hardly aids acceration when you don't change to 3rd till 80 plus mph !
given sharkwerks name it's lazy and disappointing and late to the party.
jens seems to be still leading the way with tuning, his latest was a 981 3.4 giving 385bhp !
just uses the bigger throttle with the cargraphic manifolds (U.K. Made)and a 3rd party tune. As for catchpole, it's unforgivable given it's his job to say it's a x51 power pack engine.
So what we were doing to gen 1 Caymans back in 2005 Inc the guards diff etc.And what my Spyder was 5 years back.
I also dont get the shorter 3rd gear, 2 gear is the issue imo. Now 3rd just is like 2nd gear, very odd move. Hardly aids acceration when you don't change to 3rd till 80 plus mph !
given sharkwerks name it's lazy and disappointing and late to the party.
jens seems to be still leading the way with tuning, his latest was a 981 3.4 giving 385bhp !
You're right D. With the exception of the ratio reworking, the other components are straight out of the Sharkwerk parts bin.
They explain the limited re-gearing by saying:
The ideal solution would be a complete re-gearing of 1st through 6th gears. However, that comes at an enormous cost for small batch parts and engineering 1st and 2nd gears will likely not be an option for years, if ever.
We have tested re-gearing on our own project GT4 and have settled on a solution that changes 3rd, 4th, and 5th gears to shorter, closer ratios (approx difference is 14% in 3rd, 18% in 4th, and 16% in 5th). This allows shifting to 3rd gear sooner when needed, or staying in 2nd til the normal shift point and jumping to a better position in the powerband in 3rd, and staying in 3rd gear in more situations (ie mid-low speed corners) with improved acceleration. By shortening 3rd, 4th, and 5th gears, you have closer ratios and stay in the powerband longer through typical top speeds, and will be able to retain the original freeway overdrive gear, since 6th gear is unchanged.
Given the LSD reworking, I'm surprised that they didn't engineer a lower final drive ratio. Cost constraints again I presume.
As you say, Jens appears to be the favourite go-to tuner for the 981-series cars (I think that you posted the power curve elsewhere on the forum but can't find it). DeMan Motorsport planned to fit an X51 Power Kit to a 4.0L GT4 but haven't heard of anyone else..??
Jeff
They explain the limited re-gearing by saying:
The ideal solution would be a complete re-gearing of 1st through 6th gears. However, that comes at an enormous cost for small batch parts and engineering 1st and 2nd gears will likely not be an option for years, if ever.
We have tested re-gearing on our own project GT4 and have settled on a solution that changes 3rd, 4th, and 5th gears to shorter, closer ratios (approx difference is 14% in 3rd, 18% in 4th, and 16% in 5th). This allows shifting to 3rd gear sooner when needed, or staying in 2nd til the normal shift point and jumping to a better position in the powerband in 3rd, and staying in 3rd gear in more situations (ie mid-low speed corners) with improved acceleration. By shortening 3rd, 4th, and 5th gears, you have closer ratios and stay in the powerband longer through typical top speeds, and will be able to retain the original freeway overdrive gear, since 6th gear is unchanged.
Given the LSD reworking, I'm surprised that they didn't engineer a lower final drive ratio. Cost constraints again I presume.
As you say, Jens appears to be the favourite go-to tuner for the 981-series cars (I think that you posted the power curve elsewhere on the forum but can't find it). DeMan Motorsport planned to fit an X51 Power Kit to a 4.0L GT4 but haven't heard of anyone else..??
Jeff
Most probably just the usual journalistic froth but a possible 4.0-litre GT4 RS is on the cards:
[link=http://www.autoexpress.co.uk/porsche/cayman/98318/hardcore-40-litre-porsche-cayman-gt4-rs-on-the-cards]http://www.autoexpress.co...an-gt4-rs-on-the-cards[/link]
At least Porsche may be thinking along the lines of a n/a 982 GT4.
Jeff
[link=http://www.autoexpress.co.uk/porsche/cayman/98318/hardcore-40-litre-porsche-cayman-gt4-rs-on-the-cards]http://www.autoexpress.co...an-gt4-rs-on-the-cards[/link]
At least Porsche may be thinking along the lines of a n/a 982 GT4.
Jeff
more click bait sorry to say.
we cannot even get the GT3 SPec and that's out in a week !
the next 2 sports cars after that are the 991 Speedster and the GT2, I have no idea why the mags don't talk about these 2 new cars, but I guess they don't even know that !
(ok I clicked the bait and they did talk about the GT2 but the GT3 and the GT2 specs are not what is coming, so made up numbers ) they think a new base GT3 will have more BHP than the outgoing 991 RS , I doubt that also.
GT4 with a 4.0 L engine will never happen imo we have the 718 now so what engine can they really put in a new GT4 !
put it this way it cannot be a GT3 engine because we have the GT3 at £40k above the GT4 price. There is no space in the line up for a GT4 RS, well with a 4 pot there might be.
And as a GT4 RS would be a few years away, we need a GTS 1st can you see them putting the 991.1 old 3.8 GTS unit in it !
The mags print rubbish, the insiders they talk about are made up from thin air but once a story is posted by one mag they all need to do it to get the clicks.
we cannot even get the GT3 SPec and that's out in a week !
the next 2 sports cars after that are the 991 Speedster and the GT2, I have no idea why the mags don't talk about these 2 new cars, but I guess they don't even know that !
(ok I clicked the bait and they did talk about the GT2 but the GT3 and the GT2 specs are not what is coming, so made up numbers ) they think a new base GT3 will have more BHP than the outgoing 991 RS , I doubt that also.
GT4 with a 4.0 L engine will never happen imo we have the 718 now so what engine can they really put in a new GT4 !
put it this way it cannot be a GT3 engine because we have the GT3 at £40k above the GT4 price. There is no space in the line up for a GT4 RS, well with a 4 pot there might be.
And as a GT4 RS would be a few years away, we need a GTS 1st can you see them putting the 991.1 old 3.8 GTS unit in it !
The mags print rubbish, the insiders they talk about are made up from thin air but once a story is posted by one mag they all need to do it to get the clicks.
Brian_Innes
Member
I completely agree Mr D.
A lot of guff, (or the current word, "fake news") is printed by the mags to sell print.
All will become apparent in the fullness of time.
As I posted elsewhere, Porsche have painted themselves into a corner with the sports cars engines.
Brian
A lot of guff, (or the current word, "fake news") is printed by the mags to sell print.
All will become apparent in the fullness of time.
As I posted elsewhere, Porsche have painted themselves into a corner with the sports cars engines.
Brian
Undoubtedly the 718/982 GTS will use the 4-pot turbo engine; that makes perfect sense.
However, even for relatively limited production it's possible that the next GT4 could still use the flat-6 n/a engine with either 3.8L or 4.0L capacity since I believe that the GT4, GT3 and Turbo share the same crankcase/block casting, albeit with different heads and internals. An engine is just an assembly of components and if they can be manufactured and supplied at the right price I'm sure that Porsche can produce a midly uprated engine with minor development costs.
The 982 BIW rear structure has been modified slightly compared with that of the 981 to accept the 4-pot engine which is subframe mounted, but I don't think that it would be difficult to incorporate the flat-6 engine in the 982 chassis. Anyway, the GT4 body has some additional reinforcements compared with that of the standard 981 body, so body mods aren't out of the question for the next car.
Work would be required integrating the 981-series electronics into the latest series car; again, not an insurmountable problem but one which incurs costs.
So, will Porsche do it? Heart says yes but head says no. A lot depends upon production numbers, and I've a feeling that Porsche won't be caught out with demand comfortably outstripping supply the second time around.
Just my tuppence worth of course.
Jeff
However, even for relatively limited production it's possible that the next GT4 could still use the flat-6 n/a engine with either 3.8L or 4.0L capacity since I believe that the GT4, GT3 and Turbo share the same crankcase/block casting, albeit with different heads and internals. An engine is just an assembly of components and if they can be manufactured and supplied at the right price I'm sure that Porsche can produce a midly uprated engine with minor development costs.
The 982 BIW rear structure has been modified slightly compared with that of the 981 to accept the 4-pot engine which is subframe mounted, but I don't think that it would be difficult to incorporate the flat-6 engine in the 982 chassis. Anyway, the GT4 body has some additional reinforcements compared with that of the standard 981 body, so body mods aren't out of the question for the next car.
Work would be required integrating the 981-series electronics into the latest series car; again, not an insurmountable problem but one which incurs costs.
So, will Porsche do it? Heart says yes but head says no. A lot depends upon production numbers, and I've a feeling that Porsche won't be caught out with demand comfortably outstripping supply the second time around.
Just my tuppence worth of course.
Jeff
They can make it, the cost don't fit in the line up of cars.
A GT4 is £64k and GT3 is £105k both with no options at a guess, so it cannot have the 4.0l engine and the GT3 3.8 has major issues.
A GT4 RS with the 3.8 GTS 420BHP unit and carbon bonnet for £80k might work, but then the race car does not have the GTS unit for some odd reason.
So I cannot see any of those working, which leaves a future GT4 with a 4 pot in 3 years time, and never a RS.
A GT4 is £64k and GT3 is £105k both with no options at a guess, so it cannot have the 4.0l engine and the GT3 3.8 has major issues.
A GT4 RS with the 3.8 GTS 420BHP unit and carbon bonnet for £80k might work, but then the race car does not have the GTS unit for some odd reason.
So I cannot see any of those working, which leaves a future GT4 with a 4 pot in 3 years time, and never a RS.
Like you D I can't see an RS being on the cards. Also, the longer it takes for Porsche to introduce the 982 GT4 the less likelyhood there is of it being n/a since f-4 turbo development will have moved on a pace. Porsche will also have eye on producing a more competitive GT4 race car (the current GT4 Clubsport has been somewhat disappointing in base form) and the 4-pot has far more tuning potential.
At £64 the GT4 was a comparative bargain but I'm sure that we'll be looking at the next car coming in at around £70k due to the weakness of Sterling against the Euro, inflation, profiteering, etc.
I'm always intrigued to know: who are these "insiders" and "sources" that the mags quote? Are they jounalistic Fifth Columnists? Aggrieved employees perhaps? Maybe they're double-agents; misinformers planted by The Company to spead unfounded rumours..!
Jeff
At £64 the GT4 was a comparative bargain but I'm sure that we'll be looking at the next car coming in at around £70k due to the weakness of Sterling against the Euro, inflation, profiteering, etc.
I'm always intrigued to know: who are these "insiders" and "sources" that the mags quote? Are they jounalistic Fifth Columnists? Aggrieved employees perhaps? Maybe they're double-agents; misinformers planted by The Company to spead unfounded rumours..!
Jeff
Jeff, I think that your last assessment of the "insiders" and "sources" is on the button, deliberately leaked information to the media, as an example how many years were they talking of a four cylinder Boxster/Cayman before it came out? As I recall around the time that the 981 was announced maybe before that and it was to go into an entry level Baby Boxster/Cayman although the possible output was higher than such a market placement would normally have as they were stating in the rumours the same BHP as the 718's have... in which case to maintain differentials what power levels would the mainline models have had.
Manthey margin + JZM margin, hmm at least cheaper than PCCB to save some weight
Probably not cheap but they do look nice.. !!
They are BBS wheels with a cutout on the spokes. Manthey marketing manager said there was not much difference in weight BBS v Manthey. I think most forged aftermarket wheels are lighter than OEM.
any one buying this month ?
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