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My check engine light appeared today whilst on track - intermittently at first and then stayed on permanenty. I havent had a chance to run it by the dealer to check it out. This was my first outing with the LSD and I re-set my Revo re-map ECU yesterday. Has anyone else experienced this problem and found the diagnosis?
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
I had CEL issues on the track, but not because of a remapped ECO or LSD. I was having a bad case of the dreaded "oil farts". My mechanic was at the track with his diagnostic computer and read the code as a fouled plug on #6.
So unless you were puffing smoke in the twistys, I couldn't draw a correlation between my experience and yours.
Terry
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
__________________ Go Fast, Brake Late, Don't F*ck Up!
I've recently been plagued with the CEL light coming and staying on. It appeared the first time after a HUGE oil fart on start-up at the track. I took the car to the dealership, and they told me that there is nothing wrong at all, it is just the temperature sensor on the Fabspeed pre-cat indicating a lower temperature than it is programmed to see with the stock pre-cats.
They eliminated the fault code, but I didn't drive 20 miles and it came on again. My options (according to the dealership) is to ignore the light, or keep getting it re-set. Option 1 sucks because I don't want to ignore an indication that could mean something different and potentially more serious (and warranty voiding). Option 2 sucks because I'll never make it home from the dealership.
This may be a different situation altogether from what ttommason is experiencing, and it may just be a Fabspeed related matter, but either way it is disconcerting. Anyone else experience something like this ?
Fabspeed
Fabspeed manufactures the world’s highest quality “MAXFLO” T304 Stainless Steel exhaust systems, carbon fiber style high performance air intake systems and more for Porsche, Ferrari, Maserati and Lamborghini cars.
My check engine light appeared today whilst on track - intermittently at first and then stayed on permanenty. I havent had a chance to run it by the dealer to check it out. This was my first outing with the LSD and I re-set my Revo re-map ECU yesterday. Has anyone else experienced this problem and found the diagnosis?
Terry, the 'Yellow Peril' used to exhibit this on the track - (but never on ordinary roads) and I believe it was to do with oil ingestion. Probably with the greater speed around corners you are seeing the same (How was the LSD by the way?)
I fitted the Mantissport Sump extension and now run One section low on the Oil Measurement (with the lowered pick up and greater oil capacity no problem) and saw no problems at all even though I was going faster around the corners with the LSD - Talk to Allan about getting the Mantissport Kit an easy fix.............
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
Hi Karel
Long time no hear. Trust you are well. The diff is awesome. First time on track with it at brands hatch indy this week and it was simply untouchable - to the extent that one disgruntled carrera s owner who I almost lapped left the circuit early, drove to Parr and asked them what had been done to my car - and could they help him!! There is quite simply a huge difference which is really highlighted by brands hatch since its full of sweeping bends. Its a remarkable improvement which seems to keep the power down whilst avoiding the PSM light. Im not sure if you have driven brands but paddock hill is almost 'fall off a cliff' in terms of decline followed by steep incline climb and the final also requires a very steep hill climb. I think you are right in that this has caused some kind of oil surge - exagerated by the very steep inclines and decsents at the circuit. My light is still on and I need to get it checked next week when I get time. How much is the sump extension? It sounds like a good idea. Whena re you on track next? There is a RMA day at Bedford on Saturday 26th - you should try and attend. Have you been on track since I seen you last? Look forward to hearing from you.
Terry
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.
Sump extension/windage tray and the underdrive pulley for the crank to keep from melting the powersteering pump cost me about $900 (usd -- Mantis Sport is in Canada), and <$300 for installation and oil change. Love it, no more smoking in the turns or start-up.
Hi Karel
Long time no hear. How much is the sump extension? It sounds like a good idea. Terry
Terry,
I know Brands well, started out in Formula Ford there 35 years ago, I know Paddock bend well having gone straight on there at least a couple of times loosing my nose cone!
You can get the Sump Extension from Allan at Motordrive, it is on his website. Fitting should be about an hour all in. Plus you need 5 litres of Mobil No 1 and it is good to replace the oil filter, the sump plug washer too at the same time. Remember to get the Red High temperature Gasket sealant too.
Glad you found out and enjoyed the diference with the LSD. I am following your adventures avidly, great to see you are having so much fun, but I have a family and work committments so cannot get out as much as you can.
I'll see about the meeting you suggest - where is there website?
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
