» Cayman Spec Information |
 CaymanSpec Racing is creating a new “spec” racing class intended to govern club-level competition among first generation Porsche Cayman and Cayman S sports cars. Guiding the development of this class are a focus on driver development and the creation of an environment where driver skill, equipment reliability, and consistency are rewarded through balanced competition and cost control.
Initial eligibility is limited to model year 2006, 2007, and 2008 Porsche 2.7 liter Cayman and 3.4 liter Cayman S USA specification cars that are properly modified for racing (per CaymanSpec regulations). Integration of other Porsche model 987 production cars may be considered if there is interest.
This is currently a grassroots effort, but it is the intent that as the regulations mature the CaymanSpec Racer - or CSR - class will be considered for adoption by multiple club racing organizations. Please visit the Proposed CaymanSpec Racing Regulations discussion, download the current draft rule set and take the opportunity to provide your suggestions on how we can make CaymanSpec a success.
CaymanSpec Racing is an independent amateur effort not supported in any way by Porsche AG, PCNA, PMNA, PCA, or the POC.
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04-20-2009, 08:59 PM
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Porsche Prophet
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Proposed CaymanSpec Racing Regulations - Please Comment
Welcome future CaymanSpec Racers!
Attached is the first revision of the regulations for the proposed CaymanSpec Racing class. This rule set was created by a number of grassroots Cayman owners and racers who desire to build a new club-level racing class in the spirit of BoxsterSpec and 944 Spec classes.
It is expected that it will take some time to create the necessary momentum to have the class adopted by national and regional sanctioning bodies, so we have some time to get this right. While we work to build awareness and interest in CaymanSpec we hope to expose as many potential racers as possible to the proposed class and gain agreement on a rule set that meets the spirit of CaymanSpec and puts the greatest number of cars on track.
Please download the attached file, give the document a good read and post your suggestions to this thread. When it appears we are closing in on a reasonable spec we will present the class for consideration to a number of club racing organizations as part of their annual rules revision process.
Of course we hope that during this development period many of you will start to build your Caymans, run them with your local race club or sanctioning body, and spread the word about CaymanSpec.
See you at the track!
CaymanSpec Racing
Original
Cayman Spec Regulations 2010 R1.pdf
Revised
Cayman Spec Regulations 2010 R2.pdf
Last edited by CaymanSpec Racing; 06-03-2009 at 02:49 PM.
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04-20-2009, 09:43 PM
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Admin & Founder
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
Looks pretty good so far, congrats on the initial spec!
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04-21-2009, 08:43 AM
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VLAGER
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
A good start.
Comments:
6.3.7-Why no bump steer?
6.4.1-Why no forged wheels?
6.7.6 Intake is free to throttle body-spec should state that no increase in outside air intake area permitted. Must run air cleaner element OEM or free flow replacement (i.e. K&N, etc)
6.7.7-Exhaust is free beyond OEM exhaust manifold-are OEM manifold cats considered part of header? No racing cats? Rule implies no silencers-correct?
6.7.9-Revise; no ethlylene glycol coolant permitted. Water only.
6.8.1-Quaife TBD permitted. Why no LSD (i.e. Guard LSD)?
6.8.2-AASCO lightweight flywheel permitted. Are other manufacturers permitted?
6.8.3-Sach clutch permitted. Are other manufacturers permitted?
6.10.1-Factory SEATS..... are 2 seats required?
Spec is pretty silent about roll cages. I know that putting one in could add weight, but I can significantly stiffen the car by doing so. I think that the spec has to say something about this.
Make safe-kill switch mandatory.
Add something about fire suppression. Minimum is fire extinguisher within driver reach.
Headlights and brake lights to remain functional?
Two windshield wipers to remain functional? Delete OEM and replace with single?
Spec is silent about body modifications to improve air flow/down force.
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LSD - Limited Slip Differential
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A limited slip differential (LSD) is a modified or derived type of differential gear arrangement that allows for some difference in rotational velocity of the output shafts, but does not allow the difference in speed to increase beyond a preset amount. In an automobile, such limited slip differentials are sometimes used in place of a standard differential, where they convey certain dynamic advantages, at the expense of greater complexity.
The main advantage of a limited slip differential is found by considering the case of a standard (or "open") differential where one wheel has no contact with the ground at all. In such a case, the contacting wheel will remain stationary, and the non-contacting wheel will rotate freely– the torque transmitted will be equal at both wheels, but will not exceed the threshold of torque needed to move the vehicle, thus the vehicle will remain stationary. In everyday use on typical roads, such a situation is very unlikely, and so a normal differential suffices. For more demanding use however, such as driving off-road, or for high performance vehicles, such a state of affairs is undesirable, and the LSD can be employed to deal with it. By limiting the velocity difference between a pair of driven wheels, useful torque can be transmitted as long as there is some friction available on at least one of the wheels.
To see the installation of a LSD style unit Click Here -> Article Forthcoming Stay Tuned |
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04-21-2009, 09:41 AM
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Porsche Enthusiast
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
Looking great, can't wait for a few years to pass and the donor car prices to come down. I can't bring myself to cut up my CS...
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04-21-2009, 02:49 PM
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Sexual Philanthropist
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
Why not consider salvage titled cars?
How will you monitor ecus? It may simplify everything by making this free. People cheat, plain and simple.
Are other tires going to be allowed? Is the Nitto the "rain" tire? The advantages of the Hoosier are great, it will be the difference of being competitive or not. Have you considered making a "spec" tire. I think you would easily get Nitto to inkind sponsor the series.
Obviously this is very early on but I like the direction. I've built a couple of street cars to spec rules and am very much considering that path for the CS. Good luck!
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2008 Cayman S, Black, Floormats
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04-21-2009, 09:57 PM
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
If you're really trying to control costs, then spec Nitto NT01 tires. They last much much longer than the Hoosiers.
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04-22-2009, 01:35 AM
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Crusin worlds most isolated city
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
I suggest:
Remove restrictions 6.4.1, 6.4.2. Spacer<23mm.
Remove restrictions 6.5.1, 6.5.2 no good as is.
Remove restrictions 6.6.7 thats just dumb.
Remove restrictions 6.7.11 thats just dumb -again.
6.8.1 should permit OEM LSD as supplied. Esp as factory now has the option. dumb -again.
6.8.2 Why lock it to one brand?
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LSD - Limited Slip Differential
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A limited slip differential (LSD) is a modified or derived type of differential gear arrangement that allows for some difference in rotational velocity of the output shafts, but does not allow the difference in speed to increase beyond a preset amount. In an automobile, such limited slip differentials are sometimes used in place of a standard differential, where they convey certain dynamic advantages, at the expense of greater complexity.
The main advantage of a limited slip differential is found by considering the case of a standard (or "open") differential where one wheel has no contact with the ground at all. In such a case, the contacting wheel will remain stationary, and the non-contacting wheel will rotate freely– the torque transmitted will be equal at both wheels, but will not exceed the threshold of torque needed to move the vehicle, thus the vehicle will remain stationary. In everyday use on typical roads, such a situation is very unlikely, and so a normal differential suffices. For more demanding use however, such as driving off-road, or for high performance vehicles, such a state of affairs is undesirable, and the LSD can be employed to deal with it. By limiting the velocity difference between a pair of driven wheels, useful torque can be transmitted as long as there is some friction available on at least one of the wheels.
To see the installation of a LSD style unit Click Here -> Article Forthcoming Stay Tuned |
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__________________
2010 Cayman S, special build.
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04-22-2009, 10:01 AM
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Sexual Philanthropist
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
Originally Posted by 4by4
I suggest:
Remove restrictions 6.4.1, 6.4.2. Spacer<23mm.
Remove restrictions 6.5.1, 6.5.2 no good as is.
Remove restrictions 6.6.7 thats just dumb.
Remove restrictions 6.7.11 thats just dumb -again.
6.8.1 should permit OEM LSD as supplied. Esp as factory now has the option. dumb -again.
6.8.2 Why lock it to one brand? |
4by4 saying things are "dumb" is not constructive. Especially when you clearly have not read the document correctly.
1. Minde doesn't have a 6.6.7, please clarify
2. There was no oem LSD offered from 06-08.
They've asked for comments but let's try to keep them constructive and informed. I do agree with some of your comments btw.
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LSD - Limited Slip Differential
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A limited slip differential (LSD) is a modified or derived type of differential gear arrangement that allows for some difference in rotational velocity of the output shafts, but does not allow the difference in speed to increase beyond a preset amount. In an automobile, such limited slip differentials are sometimes used in place of a standard differential, where they convey certain dynamic advantages, at the expense of greater complexity.
The main advantage of a limited slip differential is found by considering the case of a standard (or "open") differential where one wheel has no contact with the ground at all. In such a case, the contacting wheel will remain stationary, and the non-contacting wheel will rotate freely– the torque transmitted will be equal at both wheels, but will not exceed the threshold of torque needed to move the vehicle, thus the vehicle will remain stationary. In everyday use on typical roads, such a situation is very unlikely, and so a normal differential suffices. For more demanding use however, such as driving off-road, or for high performance vehicles, such a state of affairs is undesirable, and the LSD can be employed to deal with it. By limiting the velocity difference between a pair of driven wheels, useful torque can be transmitted as long as there is some friction available on at least one of the wheels.
To see the installation of a LSD style unit Click Here -> Article Forthcoming Stay Tuned |
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__________________
2008 Cayman S, Black, Floormats
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04-22-2009, 08:20 PM
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
It all good news.
The French style roll cage maybe cheaper, and easier to install. I do wonder as to the strength of this cage. But maybe there is some significant test data for it? Without some good testing, or good accident data,.. it looks maybe too weak.
Love to see this race series happen.
Last edited by Bodhii; 04-22-2009 at 08:26 PM.
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04-22-2009, 10:39 PM
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Crusin worlds most isolated city
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
Originally Posted by RingSport
4by4 saying things are "dumb" is not constructive. Especially when you clearly have not read the document correctly.
1. Minde doesn't have a 6.6.7, please clarify
2. There was no oem LSD offered from 06-08.
They've asked for comments but let's try to keep them constructive and informed. I do agree with some of your comments btw. |
True, "dumb" is not constructive. But I am usually trying to limit typing due to already spending too much time here, me  . My way to say I dont like / agree with it.
Typo 6.7.6. Should include Plenum mods or any simple bolt on mod. The beauty of this is easy to check and reverse, apart more gaining the power the Cayman should have had in the first place.
If you include all these basic mods then you avoid cheats because it is allowed if wanted. In any case these mods are simple cheap, reliable and improve efficiency. Additionally power gain from each mod is small so its not as if some one can get a huge power bump advantage.
LSD, Is allowed for an 09 factory car?? - should be. So obviously prior to 09 can allow after market diff mod.
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LSD - Limited Slip Differential
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A limited slip differential (LSD) is a modified or derived type of differential gear arrangement that allows for some difference in rotational velocity of the output shafts, but does not allow the difference in speed to increase beyond a preset amount. In an automobile, such limited slip differentials are sometimes used in place of a standard differential, where they convey certain dynamic advantages, at the expense of greater complexity.
The main advantage of a limited slip differential is found by considering the case of a standard (or "open") differential where one wheel has no contact with the ground at all. In such a case, the contacting wheel will remain stationary, and the non-contacting wheel will rotate freely– the torque transmitted will be equal at both wheels, but will not exceed the threshold of torque needed to move the vehicle, thus the vehicle will remain stationary. In everyday use on typical roads, such a situation is very unlikely, and so a normal differential suffices. For more demanding use however, such as driving off-road, or for high performance vehicles, such a state of affairs is undesirable, and the LSD can be employed to deal with it. By limiting the velocity difference between a pair of driven wheels, useful torque can be transmitted as long as there is some friction available on at least one of the wheels.
To see the installation of a LSD style unit Click Here -> Article Forthcoming Stay Tuned |
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__________________
2010 Cayman S, special build.
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04-22-2009, 10:43 PM
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Crusin worlds most isolated city
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
Originally Posted by Bodhii
It all good news.
The French style roll cage maybe cheaper, and easier to install. I do wonder as to the strength of this cage. But maybe there is some significant test data for it? Without some good testing, or good accident data,.. it looks maybe too weak.
Love to see this race series happen. |
I like it. You can actually get in reasonably. Still better than nothing!
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2010 Cayman S, special build.
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04-22-2009, 11:37 PM
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Porsche Purist
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
spec racing = cost control
if you dont care about cost, do not race spec racers.
if you really want spec racing, no need to reinvent wheels. look at spec miata and spec boxster. just do the same.
the goal is not make your car faster. it's just make everyone have the same car. if they all sucked or of they all are great, doesn't matter as long as they are all the same.
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04-22-2009, 11:42 PM
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Admin & Founder
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
Originally Posted by mooty
spec racing = cost control
if you dont care about cost, do not race spec racers.
if you really want spec racing, no need to reinvent wheels. look at spec miata and spec boxster. just do the same.
the goal is not make your car faster. it's just make everyone have the same car. if they all sucked or of they all are great, doesn't matter as long as they are all the same.
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Mooty,
You didn't answer the question inquiring minds want to know, are you going to race a spec Cayman in either series? 
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04-23-2009, 12:41 AM
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Porsche Chatter
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
for me it would be costly to remove the existing upgraded equipment including:
LSD
Headers
throttle body
rotors
plus purchasing:
18 OEM Rims
probably making this too costly (although depends where the races are held)
I've been waiting for something like this, just hoped that my upgrades would be valid for a series like this
-Adam
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LSD - Limited Slip Differential
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A limited slip differential (LSD) is a modified or derived type of differential gear arrangement that allows for some difference in rotational velocity of the output shafts, but does not allow the difference in speed to increase beyond a preset amount. In an automobile, such limited slip differentials are sometimes used in place of a standard differential, where they convey certain dynamic advantages, at the expense of greater complexity.
The main advantage of a limited slip differential is found by considering the case of a standard (or "open") differential where one wheel has no contact with the ground at all. In such a case, the contacting wheel will remain stationary, and the non-contacting wheel will rotate freely– the torque transmitted will be equal at both wheels, but will not exceed the threshold of torque needed to move the vehicle, thus the vehicle will remain stationary. In everyday use on typical roads, such a situation is very unlikely, and so a normal differential suffices. For more demanding use however, such as driving off-road, or for high performance vehicles, such a state of affairs is undesirable, and the LSD can be employed to deal with it. By limiting the velocity difference between a pair of driven wheels, useful torque can be transmitted as long as there is some friction available on at least one of the wheels.
To see the installation of a LSD style unit Click Here -> Article Forthcoming Stay Tuned |
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04-23-2009, 09:10 AM
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Porsche Purist
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
Originally Posted by K-Man S
Mooty,
You didn't answer the question inquiring minds want to know, are you going to race a spec Cayman in either series? |
i am not very rational.
on 12/21/08 i decided i didn't like to do oil change on my 08 997gt3. i dumped it to dealer and drove home a loaner 99 box. i decided not to return it to them. end of feb 2009, i tested my BSR build up from that donar/loaner. and in march i entered and got pole on my first two races and won the 2nd ;-)
when cayman spec rules are SET, i will race one provided the we have 6+ cars in norcal grid.
the spec is easy to do, copying another spec is the fastest way to get it done.
but to grow the grid is tough. BSR took 3 years to get real traction. and 2.5L box are $10k only. cayman are still around 30k. that's not a small hurdle to jump through.
and let me put the ugly first. you look at BSR build sheet, i think it says build cost is $10k.... hahaha, i am laughing my balls off. you build me a winning car for 10k, i buy EVERYONE you can build.
the KEY in racing is take very $ and multiply it by 5, you get close to your true cost.
and TIRES man, get the tires right. i had the car since late feb. i am on my 5th set of front and 3rd set of rears.
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04-23-2009, 09:11 AM
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Porsche Purist
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
Originally Posted by K-Man S
Mooty,
You didn't answer the question inquiring minds want to know, are you going to race a spec Cayman in either series? |
in either series....
i am lost.
there are two series even before we start?.....
do we see a problem here or what?
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04-23-2009, 09:14 AM
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PCA Member
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
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or me it would be costly to remove the existing upgraded equipment including:
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alavelle, the spec series Caymans would be for stripped out race only cars. It's not being set up with our current street cars in mind. This is usually accomplished by purchasing an older, used CS for the very lowest price possible, and then completely gut it out, install the roll cage, and then go race!
Last edited by Bodhii; 04-23-2009 at 09:29 AM.
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04-23-2009, 09:30 AM
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Sexual Philanthropist
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
I'm not a fan of cages that don't have a dash bar. This amounts to a more cumbersome "roll bar". The idea of a true cage is to provide an occupant shell. Having had a pretty big impact in a fully cage car, I would say the extra effort is worth it.
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2008 Cayman S, Black, Floormats
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04-23-2009, 10:52 AM
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Admin & Founder
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
Originally Posted by mooty
in either series....
i am lost.
there are two series even before we start?.....
do we see a problem here or what?
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No, one series is buying a brand new car Gen 2 pre-prepped for the most part for you.
The other series is buying an existing Gen 1 Cayman (or converting one you have) into a spec car by abiding by the set of rules established.
I think the first is more expensive than the second, so depending upon your pocketbook, you end up in one or the other.
Which do you favor?
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04-23-2009, 11:18 AM
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Geek
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Re: Proposed CaymanSpec Racing Regulations - Please Comment
Originally Posted by K-Man S
No, one series is buying a brand new car Gen 2 pre-prepped for the most part for you.
The other series is buying an existing Gen 1 Cayman (or converting one you have) into a spec car by abiding by the set of rules established.
I think the first is more expensive than the second, so depending upon your pocketbook, you end up in one or the other.
Which do you favor?
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In my opinion there are very few who can afford to buy a brand new car and then go race it. The chance of a crash or hard contact significantly damaging the car is high, and so that become an expensive proposition. It's a tough economy to risk essentially throwing away a $65,000 car. If the series for the new cars has sufficient sponsorship that the cost of the car gets covered, then OK, but this forum is mainly populated by unsponsored enthusiasts, and not by professional drivers.
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