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Guys I see this unit on the Motordrive website and wondered if anyone can tell me how much of a difference they make to the Cayman S please?
I've heard that they really improve acceleration to the point that the car can match or better a 911 but is this true? What other benefits would I get from fitting this part and is my insurance company likely to take the huff over it?
If this is a worthwhile mod, where can I get it fitted in Aberdeenshire?
Curious,
Les.
Motordrive
Motordrive
Moslo Mill
Ebury Street
Radcliffe
Manchester
M26 4BL
UK
Allan’s (Tess Tickle) car was on a different planet..............having driven my own for a few sessions, Allan let me take out his silver dagger with 18s and PS2 tyres so I could sample the Diff.
OH MY GOD, what a difference. the drive in ALL corners was phenomenal compared to my car (very similar spec barr the LSD). In the tight stuff it was just ridiculous how the power was so easy to put down.
Then mid morning he threw on some 18s with Carrera Cup slick tyres on. Cup fronts on the rear, and something different on the front. Again, he let me take it out.
WOW, WOW, WOW, WOW, this is just out of this world. What a transformation. Those used Carrera Cup tyres made a mockery of standard PS2 tyres. Combined with the LSD, there was NOTHING on the track that could touch this car.
Yes, it had cat-back Milltek, but that was it. Completely stock (No PASM, No SC, No suspension mods, No super-wide rims, No re-map) this car was awesome. Period.
Allan, my hat off to you, thanks for the experience!!....from Jack Wood
Many Thanks to www. motordrive.com for their outstanding customer service, and guidance in fitting the unit, not to mention the spectacular driving skills exhibited by their chief executive, a true gentleman!
The ATB/LSD cannot be recommended too highly.....from Karel Deeley
I have NO mods on my car, but this is absolutely going to be the first, and probably only one I will get. It's just THAT good............Jack Wood
The Cayman with the Quaife diff fitted feels a completely different car when “Pressing On”, More Sporty, Lively and there are No flashing Lights to put you off all the time.
When you turn the PSM off…well, it lets you drive the car to it’s potential and probably over yours.
What can I say but More Smiles per Mile and a dam sight more fun !!!
Local Independent Porsche Specialist ………………Chris Sanderson
If you have not signed up to buy one of these LSD units and you think you are going to track your car, or you just want a better driving car on the street. GET ONE. I was wrong, the Cayman NEEDS LSD. GET ONE!...K-Man S
Good job Quaife on precision machining these to the original differential specs.
I have spent a couple of days thrashing the Cayman around tight turns where, prior to the install, the inside wheel would break loose powering out of the turn. This is no longer an issue with the Quaife. The car now stays planted and actually seems to launch better in a straight line.
I have not done much to the car, desnork, Evo Intake, it had the short shift from the factory and a bunch of cosmetic stuff. None of those is as satisfying the Quaife (even the Dension GW500 iPod adapter). I cannot imagine why Porsche did not make this an option, other than the obvious need to handicap the Cayman for the sake of the 997.
Thanks Tess for making this available to us!................................JHellow
Well, I after a month of waiting, I finally got my ATB diff in. Man, what a difference. On ramps where I normally broke free I'm now hooking up. Likewise on a few choice turns.
Anyhow, any fence sitters, another happy Quaife ATB customer. Why Porsche didn't put this in from the factory is a crime…………………..Brians
Initial impressions (after 1 short drive) are that you can really feel the rear tires break-away as a pair when you provoke the rear whilst exiting junctions. It feels beautifully controlled, and it feels like virtually all of the axel tramp has been removed as well………….JackWood
BTW If anybody has any comments, after fitting the unit (good or bad) lets put them here !!
PASM - Porsche Active Suspension Management
This active damping system offers continuous adjustment of individual damping forces based on current road conditions and driving style.
The driver can choose from two setup modes, ‘Normal’ and ‘Sport’, using a separate ‘damper’ button on the center console. ‘Normal’ mode is designed for general road driving and circuits with uneven tarmac. ‘Sport’ mode is intended for smoother track surfaces, where the harder settings help eliminate pitch and roll.
In either mode, PASM continuously evaluates the current conditions while automatically selecting the corresponding damper rates from the respective set of mapped values.
A range of sensors are used to monitor the movement of the body under acceleration, braking and cornering maneuvers, as well as on poor road surfaces. The PASM control unit then evaluates this data and modifies the damping force on each individual wheel in accordance with the selected mode. The result is a significant reduction in body movement as well as a better grip on the road.
For example: if ‘Sport’ mode is selected, the suspension is automatically set to a harder damper rating. If the quality of the track surface falls below a certain threshold, the system immediately changes to a softer rating within the ‘Sport’ setup range. When the quality of the tarmac improves once more, PASM automatically returns to the original, harder rating.
Need more information about PASM? Click this link: FAQ for PASM
LSD - Limited Slip Differential
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
PSM - Porsche Stability Management
While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, yaw velocity and lateral acceleration to calculate the actual direction of travel. If the car begins to steer off line, PSM instantly intervenes with precision brake inputs on individual wheels to help bring the car back onto the driver’s intended path.
If braking alone isn’t enough to correct the vehicle’s cornering line, PSM then calls on the Cayman’s engine management system, adjusting engine output as needed to help stabilize handling. PSM can also compensate in an instant for mid-corner changes in load resulting from deceleration or braking. When Sport mode is selected with the optional Sport Chrono Package, PSM’s threshold for intervention is raised, allowing for greater driver involvement. If you prefer driving without automatic PSM assistance, the system can be set to standby at any time. In this case, it will only intervene under heavy braking, where both front wheels exceed the ABS threshold.
For all of its technical ability, PSM goes virtually unnoticed in everyday driving situations, preserving the Cayman’s natural agility.
Motordrive
Motordrive
Moslo Mill
Ebury Street
Radcliffe
Manchester
M26 4BL
UK
With an ordinary open differential, a lot of precious power is wasted during wheel spin under acceleration. This happens because the open differential shifts power to the wheel with less grip, along the path of least resistance. The torque capacity of the TBD/ATB unit is increased or decreased by varying the helix and pressure angles of the gear teeth. The operation is automatic and the unit is a direct replacement with the stock differential. There are no clutch plates as in more conventional limited-slip designs.
The Torque Biasing Differential or A.T.B., however, does just the opposite. It senses which wheel has better grip, and biases the power to that wheel. It does this smoothly and constantly, and without ever completely removing power from the other wheel. In drag-race style, straight-line acceleration runs, this results in a close to ideal 50/50 power split to both drive wheels, resulting in essentially twice the grip of an ordinary differential.
To see the installation of a TBD style unit Click Here
Evolution Motorsports
http://www.evoms.com
We exist to satisfy our customers' addiction to speed and passion for high performance. We engineer, manufacture and offer the highest quality performance components for an elite group of extreme individuals. We are obsessed with delivering the ultimate level of performance through developing superior quality products, stringent testing and unparalleled customer service. Over time, we endure, evolve, persevere and have become omnipotent in our industry.
Yes, this is a very much discussed mod on here with several threads - I'd recomend searching around. I just received mine and am pretty excited about it but I'm not sure when it will get installed...
__________________
2006 Arctic Silver CS with SRP and LSD
Guys I see this unit on the Motordrive website and wondered if anyone can tell me how much of a difference they make to the Cayman S please?
I've heard that they really improve acceleration to the point that the car can match or better a 911 but is this true? What other benefits would I get from fitting this part and is my insurance company likely to take the huff over it?
If this is a worthwhile mod, where can I get it fitted in Aberdeenshire?
Curious,
Les.
The LSD from Motordrive will make the most difference to a Cayman on the Track - on the road you will have some advantage, but with the congestion these days no opportunity, unless you sprint the higland byways. Then you will enjoy it greatly.
The improvement is the power/speed you can take bends at and on the Track it will enable the CS (with a similar driver) to outpace almost all other current Porsches................... The UK Caymanclub always get visits on the track from 'real' Porsche drivers who cannot believe our performance against them....
Your insurance company need never know - my local Porsche dealer does not know of it's existence. As such it does not exist..........
Anyway with greater control through the twisties, you will be safer, and the insurance company should applaud your safety concious attitude............
LSD - Limited Slip Differential
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
Motordrive
Motordrive
Moslo Mill
Ebury Street
Radcliffe
Manchester
M26 4BL
UK
Well, as a couple of my quotes are used above, I don't think I need say more.
However, after a few months, I stand by the claim that this is really the only mod a Cayman should ever really need.
Obviously it really depends on the driver. If you have never lit the dash up like christmas tree with the PSM lights, and you've never had a wheel spin or felt the rear of your car slide, then thiere is no need whatsoever for this mod. It will add nothing to your driving experience.
If, like me, you love to give it beans from every junction, and thurst roundabouts in order to "hone" your driving skills, throttle control and Scandinavian Flicks, then it is an absolute MUST!!
Jack
PSM - Porsche Stability Management
While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, yaw velocity and lateral acceleration to calculate the actual direction of travel. If the car begins to steer off line, PSM instantly intervenes with precision brake inputs on individual wheels to help bring the car back onto the driver’s intended path.
If braking alone isn’t enough to correct the vehicle’s cornering line, PSM then calls on the Cayman’s engine management system, adjusting engine output as needed to help stabilize handling. PSM can also compensate in an instant for mid-corner changes in load resulting from deceleration or braking. When Sport mode is selected with the optional Sport Chrono Package, PSM’s threshold for intervention is raised, allowing for greater driver involvement. If you prefer driving without automatic PSM assistance, the system can be set to standby at any time. In this case, it will only intervene under heavy braking, where both front wheels exceed the ABS threshold.
For all of its technical ability, PSM goes virtually unnoticed in everyday driving situations, preserving the Cayman’s natural agility.
The diff makes a significant difference but one that you will only really notice on track. Forget stright line accelleration blah blah. This is all about being able to get power down earlier though bends enabling higher exit speeds and hence more accumulated pace on the subsequent straights. However in order to exploit the diff to its max you are really looking at complimentary chassis upgrades such as better anti-roll bars, stress bar and springs/dampers. In combination with these mods the cayman is electric through the corners enabling crisp turn in and reassurance as you pile on the power earlier than any 911. Interestingly a Belgian team who were doing R&D on their cayman in preparation for the GT race series commented that they only really got the results they were looking for out of the diff after the dampers were upgraded from stock. They also added that they had tried numerous diffs and concluded that the quaiffe was the best even after trying some very expensive mechanical alternives.
To be perfectly honest, unless I was a track day enthusiast I wouldnt bother with the diff upgrade for pure road use. I dont reckon you would even notice the difference - unless you plan to lose your license or pole axe a lamp post!
From what I noticed in a track environment having gradually upgraded my Cayman over a year and around 12 track days is: un-modified Cayman S is as quick (eerily similar on the straights) as a standard carerra around bedford autodrome. Cayman S running on track tyres has the edge on a carerra but loses out to a carerra S on the straights. Modified cayman S is as quick as a Carerra S in a straight line on the track but eats it very quicklt over the course of 1 lap - carries much more pace into and out of corners allowing higher progressive speed on following straights where the Carerra S just cannot keep up. Here is the controversial bit; modified cayman S matches 996 GT3 on circuits with shorter straights (castle comb, brands indy) but always loses a few car lengths on long straights like the back straight at bedford AD. Cayman S struggles against modified GT3's (including the RS) which have even more straight line pace. However, modified cayman is untouchable through the bends and closes the distance it loses to the GT3's on the straights. I am generalising here of course but I think its a fair assessment. One factor to consider which we all take forgranted is that the cayman has the balance and useabilty that the 911's dont. So in the real world you can be pushing ten tenths in your cayman and enjoying every moment but your average GT3 driver is at seven tenths and burning holes in his underpants whilst he's doing it.
Karel / Tess, not sure if you boys agree. I think the bottom line is that the only 911 to challenge a well set up (and driven!) cayman S is the GT3...and depending on the circuit and the weather conditions I know where my bet would be. Thats quite an achievement for a modestly prices and powered sports car and a reflection on the quality of its balance and phenomenal chassis.....
Discussion for members in the UK & Ireland, local events, etc.
Quaife ATB Diff
