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Taking the diff out and fitting existing crown wheel to new diff is not at all difficult and would only take ½ hour or so. Setting the pinion backlash is an unknown to me at the moment. On most car’s it’s a crushable type washer, but as yet I don’t know on this gearbox. Either myself or possibly K-Man S would do a “article” to accompany the diff for fitting instructions. That's the intention anyway.
I'd be interested in installing an LSD at some point too. The torsen type LSD seems like the more practical type for me as I'll be driving the car more on the street with a few track days and autocrosses in between. Plus coming from the Honda world where there were some guys who were fitting the clutch type and having to have them "rebuilt" after a few years.
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
dont just put an LSD on your car.
figure out why you need it.
if you drive on street, even if you drive recklessly, you DONT need LSD. it either make you understeer too much or its presence is not felt, money wasted.
if you AX, you most likely need torsen.
if you track, DE, or race, you need plate type. torsen wont work if you lift wheel off ground and that's what happens if you are in the tight turn on track.
if you are spinning inside rear tire (when the tire is on the ground) you need stickier rubber. cayman s at 295hp shouldn't be spinning rear inside tire if it's on dry pavement with good rubber (notice, i said ON the pavement) if you are lifting tires, you need plate type.
grossly simplified, yes, but this is the gist of it.
-at DE you are lifting a wheel off the ground, but not at an autocross which is all tight turns & rapid transitions?? scratching my head at this. if you are lifting an inside rear wheel (and your car is not FWD) you've got serious setup issues or 8 foot wide slicks...i guess a torsen is a limitation if you are doing a lot of curb hopping, but not really an issue at most tracks, or for most drivers. torsens work great and are maintenance free. if you track/AX a lot you will need to get plate type diff rebuilt periodically and for alot of people that is cost/inconvenience prohibitive.
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
Taking the diff out and fitting existing crown wheel to new diff is not at all difficult and would only take ½ hour or so. Setting the pinion backlash is an unknown to me at the moment. On most car’s it’s a crushable type washer, but as yet I don’t know on this gearbox. Either myself or possibly K-Man S would do a “article” to accompany the diff for fitting instructions. That's the intention anyway.
you do not need to reset the pinion depth & backlash if you are just swapping the ring onto a new diff. unless porsche is differant but i swapped a quaiffe myself on another car and if the diff is made correctly you are not changing the location of the ring gear relative to the pinion. its truely a bolt in...
Does the transmission have to come out of the car?
Quote:
Either myself or possibly K-Man S would do a “article” to accompany the diff for fitting instructions. That's the intention anyway.
Man, I would love to hear what K-Man S thinks of one of these. He tracks the car enough to really be able to give us some detailed feedback and a before after comparison.
you do not need to reset the pinion depth & backlash if you are just swapping the ring onto a new diff. unless porsche is differant but i swapped a quaiffe myself on another car and if the diff is made correctly you are not changing the location of the ring gear relative to the pinion. its truely a bolt in...
your comment is correct say on a bmw. but the maker of the LSD has to have gotten the back lash right. often times, they get close, but not quite right.
p car LSD (back lash adj needed or not) is NOT a bolt on. this is INSIDE the gearbox unlike most any other cars!
and i dont know your technical expertise, but i sure as hell dont want to remove and open up my gearbox by myself.
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
-at DE you are lifting a wheel off the ground, but not at an autocross which is all tight turns & rapid transitions?? scratching my head at this. if you are lifting an inside rear wheel (and your car is not FWD) you've got serious setup issues or 8 foot wide slicks...
you may lift tire at AX too, but not as often as DE. AX has lots of transition, but the speed of transition is not as high as DE. for example, say you drive 30mph straight and just yank the wheel, you will turn, slide, spin, but not likely lifting tires.
in DE coming into a tight turn off a fast straight, say LS front staight into T2, i am about 120mph down to 30-40mph, hard on brakes, ease up, trail brake, 90 deg hair pin all happening the same time, my rear inside will lift. it's not an issue, i can wait until the wheel settles then pwr out. but in real racing (which i dont do), ideally, as soon as you made the turn at or even before apex, you want to be on throttle (your tire is still in the air now)... you need plate LSD.
sway bar and shox in thoery can dial out the tire lift issue. however, in my case, a 10 turn course i am mostly flat, only 1-2 turns i lift tire, thus the car is fairly well setup. if i made it stick on those two tight turns. it may very well be too stiff for the other 10 turns. LSD or not, and how you tune sway bar, springs, shox, are all compromises. you pick how you like to drive.
Quote:
Originally Posted by 'ringmeister
i guess a torsen is a limitation if you are doing a lot of curb hopping, but not really an issue at most tracks, or for most drivers.
correct, that's why MOST standard LSD are torsen and it is very good for most uses.
Quote:
Originally Posted by 'ringmeister
torsens work great and are maintenance free. if you track/AX a lot you will need to get plate type diff rebuilt periodically and for alot of people that is cost/inconvenience prohibitive.
right again, that's why i mentioned dont just put LSD on your car thinking it's the best thing next to bread. get it if you USE it. i dont get xenon on my cars b/c i never drive at night. sure they are great, but i never use them. that's all i am saying.
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
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