718 - PTV with Limited Slip differential
Discussion
Hi guys,
Recently ordered a 718S with PTV + limited slip diff. However, the dealer has told me there is no way to check for the presence of this particular option. As such. i was really hoping i could ask fellow owners how we can ensure or check that the option is there.
From what i've read :
1) Jack the rear wheels off the ground, set the card in neutral and turn 1 wheel . if the other rear wheel turns in the same direction, a limited slip diff is present (how accurate is this? does both wheels spinning the same way mean there is 100% A LSD present? Has anyone tried the same on a 981/718 with LSD?
2) Does the 718 or recent Porsche comes with an options sticker that can be checked?
Any thoughts and help are MUCH appreciated.
Recently ordered a 718S with PTV + limited slip diff. However, the dealer has told me there is no way to check for the presence of this particular option. As such. i was really hoping i could ask fellow owners how we can ensure or check that the option is there.
From what i've read :
1) Jack the rear wheels off the ground, set the card in neutral and turn 1 wheel . if the other rear wheel turns in the same direction, a limited slip diff is present (how accurate is this? does both wheels spinning the same way mean there is 100% A LSD present? Has anyone tried the same on a 981/718 with LSD?
2) Does the 718 or recent Porsche comes with an options sticker that can be checked?
Any thoughts and help are MUCH appreciated.
You will find a list of option codes somewhere - driver's door jamb on my 981. https://www.stuttcars.com/technical/option-codes/7... says the code for ptv is 220.
Hello Sheepysheep,
I have a 981 Cayman on which I specified the PTV with mechanically locking diff. When I tried the traditional LSD test on it I found that, contrary to my expectations, the rear wheels turned in opposite directions. When doing the same on my previous car (BMW Z4M) both rear wheels turned in the same direction.
I'm pretty sure the option I specified has been fitted because I can occasionally feel the the front of the car turn in slightly more when taking tight corners at speed. In addition, the rear brake discs seem to wearing faster than expected, suggesting they are being used more than would be the case with a non-PTV car. Therefore the only conclusion I have come to is that the 'mechanically locking diff' - as Porsche call it - does not work in quite the same way as a more traditional LSD like the one on my previous car.
I hope this might be of some help.
I have a 981 Cayman on which I specified the PTV with mechanically locking diff. When I tried the traditional LSD test on it I found that, contrary to my expectations, the rear wheels turned in opposite directions. When doing the same on my previous car (BMW Z4M) both rear wheels turned in the same direction.
I'm pretty sure the option I specified has been fitted because I can occasionally feel the the front of the car turn in slightly more when taking tight corners at speed. In addition, the rear brake discs seem to wearing faster than expected, suggesting they are being used more than would be the case with a non-PTV car. Therefore the only conclusion I have come to is that the 'mechanically locking diff' - as Porsche call it - does not work in quite the same way as a more traditional LSD like the one on my previous car.
I hope this might be of some help.
sheepysheep said:
Thanks guys. i'll look out for it about collecting the car. Just one question. The check via spinning the rear wheels. if both wheels spin the same way, this this mean with 100% certainty that there is an LSD present?
Try getting one wheel on a slippery surface, wet grass is good, and the other on a grippy surface. Try to pull away quickly and if you can you probably have a LSD, if you sit there with the wheel on the grass spinning you probably don't.Might need to turn any TC off though.
Potato5 said:
Hello Sheepysheep,
I have a 981 Cayman on which I specified the PTV with mechanically locking diff. When I tried the traditional LSD test on it I found that, contrary to my expectations, the rear wheels turned in opposite directions. When doing the same on my previous car (BMW Z4M) both rear wheels turned in the same direction.
I'm pretty sure the option I specified has been fitted because I can occasionally feel the the front of the car turn in slightly more when taking tight corners at speed. In addition, the rear brake discs seem to wearing faster than expected, suggesting they are being used more than would be the case with a non-PTV car. Therefore the only conclusion I have come to is that the 'mechanically locking diff' - as Porsche call it - does not work in quite the same way as a more traditional LSD like the one on my previous car.
I hope this might be of some help.
Thanks for sharing good sir. However i did see on the 981 forums that some users shared that with PTV, both wheels turned the same way. hmm..I have a 981 Cayman on which I specified the PTV with mechanically locking diff. When I tried the traditional LSD test on it I found that, contrary to my expectations, the rear wheels turned in opposite directions. When doing the same on my previous car (BMW Z4M) both rear wheels turned in the same direction.
I'm pretty sure the option I specified has been fitted because I can occasionally feel the the front of the car turn in slightly more when taking tight corners at speed. In addition, the rear brake discs seem to wearing faster than expected, suggesting they are being used more than would be the case with a non-PTV car. Therefore the only conclusion I have come to is that the 'mechanically locking diff' - as Porsche call it - does not work in quite the same way as a more traditional LSD like the one on my previous car.
I hope this might be of some help.
Definitely worth it. The effect is subtle with most modern torsen or visco lock diffs, and they don't do anything when both wheels are jacked off the ground. One wheel on slippy and one on grippy is good for seeing if they are doing anything, but watch out as it can make the back end side step a bit. Once you have tried that, try extra throttle on the way out of a corner when the inside rear is a little unweighted.
Haven't got my one yet, but it has PTV, and I'm collecting on Friday.
Liam
Haven't got my one yet, but it has PTV, and I'm collecting on Friday.
Liam
LiamH66 said:
Definitely worth it. The effect is subtle with most modern torsen or visco lock diffs, and they don't do anything when both wheels are jacked off the ground. One wheel on slippy and one on grippy is good for seeing if they are doing anything, but watch out as it can make the back end side step a bit. Once you have tried that, try extra throttle on the way out of a corner when the inside rear is a little unweighted.
Haven't got my one yet, but it has PTV, and I'm collecting on Friday.
Liam
Just gonna try my luck here but i think some tests would be good for a topic that has been discussed many times without a real conclusion. Could you give the real wheel test a test liam? i collect in 2 months but i plan to do a video on this. Would be great for comparisons sake Haven't got my one yet, but it has PTV, and I'm collecting on Friday.
Liam
I can, but it might be a while, as I'm short of a trolley jack or anywhere other than the road to work on cars at the moment and hate doing this sort of stuff on the vehicle jack and axle stands. Might have to wait until my intended house move in June/July, when I get the new workshops...
Anyhow - I'd really like to know what type of LSD Porsche's mechanical limited slip diff is, information seems sparse!
Liam
Anyhow - I'd really like to know what type of LSD Porsche's mechanical limited slip diff is, information seems sparse!
Liam
LiamH66 said:
I can, but it might be a while, as I'm short of a trolley jack or anywhere other than the road to work on cars at the moment and hate doing this sort of stuff on the vehicle jack and axle stands. Might have to wait until my intended house move in June/July, when I get the new workshops...
Anyhow - I'd really like to know what type of LSD Porsche's mechanical limited slip diff is, information seems sparse!
Liam
Would be really awesome if you could Anyhow - I'd really like to know what type of LSD Porsche's mechanical limited slip diff is, information seems sparse!
Liam
I'll also be doing it once i get the car, and taking a video. many treads about these on this and the planet 9 forums but no real conclusion.Discombobulate said:
Playing devil's advocate: If you can't tell the car has a LSD unless you jack it up to turn the wheels, was it really worth speccing? Also, this topic has had several threads, but there was never a real conclusion. back from the 981 threads.
http://www.planet-9.com/981-chat/89013-ptv-fitted-...
This thread wast the most comprehensive one i found where the topic was discussed quite extensively, but no conclusive method to check. the user here claims that lifting the vehicle off the ground and turning 1 wheel in neutral, both wheels spin the same way. i plan to do a video when i collect the car to conclude, but would be great if we could have more than 1 test case to put the matter to rest.
This thread wast the most comprehensive one i found where the topic was discussed quite extensively, but no conclusive method to check. the user here claims that lifting the vehicle off the ground and turning 1 wheel in neutral, both wheels spin the same way. i plan to do a video when i collect the car to conclude, but would be great if we could have more than 1 test case to put the matter to rest.
Discombobulate said:
Playing devil's advocate: If you can't tell the car has a LSD unless you jack it up to turn the wheels, was it really worth speccing? Did you take up your PEC slot OP ? If not ask the instructors there to demonstrate a car with and without to you so you can tell for yourself ?
Totally bizarre for the OPC to say there's no way they can check if it's been fitted though! There's a section on the delivery form where you sign to say you've checked that the car has been delivered as specified so if you're worried you should strike through/make an addendum to highlight this fact.
My Cayenne has the rear side airbags fitted (I hope) as an optional extra though there's no way I can tell if they're actually there.
Totally bizarre for the OPC to say there's no way they can check if it's been fitted though! There's a section on the delivery form where you sign to say you've checked that the car has been delivered as specified so if you're worried you should strike through/make an addendum to highlight this fact.
My Cayenne has the rear side airbags fitted (I hope) as an optional extra though there's no way I can tell if they're actually there.
That would be really difficult where i live (no instructors). the Most conclusive test would be if i could find another owner with the feature to jack up the back and do the test in neutral.
So far, no luck. but would be great if a fellow owner would be willing! I'll definitely be doing a video as well once i get the chance.
So far, no luck. but would be great if a fellow owner would be willing! I'll definitely be doing a video as well once i get the chance.
Edited by sheepysheep on Friday 26th May 14:52
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