Diggermeister
Hockenheim
- Joined
- 26 May 2015
- Messages
- 663
Well it's not a job I'm going to do between sessions on a track day at any rate.
Welcome to the @Porsche911UK website. Register a free account today to become a member! Sign up is quick and easy, then you can view, participate in topics and posts across the site that covers all things Porsche.
Already registered and looking to recovery your account, select 'login in' and then the 'forget your password' option.
.Cheburator said:Cunno and diggermeister,
I am not good at multi quoting... but here are my 2c...
Opening the diff on our cars is very easy (relatively speaking) as you don't need to remove driveshafts from the car. Once they are down from the diff output flanges, you can remove the former. Since you aren't changing bearings, as long as you keep the shims as you found them, there should be no changes to the backlash of the diff. Once the flanges are off, then you can remove the diff covers, once they are off, the LSD casette with the crown wheel can be removed. Splitting it open isn't difficult and then you can inspect the plates. Having a good bearing puller is helpful, but not essential.
if you are rebuilding, having a precise vernier depth gauge and basic maths skills is all that you need. All torque values are in the WSM. The beauty of the 996/7 transaxle is that it's old school. It is designed to be rebuildable, or that ratios/LSD can be swapped in the field. Hence it allows even oiks like me to have a play...
As for the ramp angles - both of you are spot on. 996.1 and 2 have 40/60 diffs, while 997.1 and 2 are much weaker at 28/40, expecting the ABS and rear brake calipers to do much of the work... we know how that worked out in real world...
Clearly Dan your car is broken :grin: or you just need to driver quicker.Senoj said:Are we absolutely sure, talking 997 here, that Rear brakes are active in the diff's behaviour with TC off, or TC and PSM off in the case of the 7.2
I have to say I'm not convinced they are. I have run with it all off most of the time and rear pads lasted forever for me so if they're doing anything it's not much.
Cunno said:Clearly Dan your car is broken :grin: or you just need to driver quicker.Senoj said:Are we absolutely sure, talking 997 here, that Rear brakes are active in the diff's behaviour with TC off, or TC and PSM off in the case of the 7.2
I have to say I'm not convinced they are. I have run with it all off most of the time and rear pads lasted forever for me so if they're doing anything it's not much.
Yes sure on 997.1 don't know for 7.2 to answer your question
Diggermeister said:I was definitely under the impression, on the 997.1 GT3, that TC off meant the rear brakes no longer played a part in the correction of the diff.
Furthermore, FWIW, when TC is left on, switching to "sport" mode (loud exhaust and different throttle response) also increases the point at which the TC will step in.
Someone please correct me if I'm wrong.
Diggermeister said:I was definitely under the impression, on the 997.1 GT3, that TC off meant the rear brakes no longer played a part in the correction of the diff.
Furthermore, FWIW, when TC is left on, switching to "sport" mode (loud exhaust and different throttle response) also increases the point at which the TC will step in.
Someone please correct me if I'm wrong.
Senoj said:Diggermeister said:I was definitely under the impression, on the 997.1 GT3, that TC off meant the rear brakes no longer played a part in the correction of the diff.
Furthermore, FWIW, when TC is left on, switching to "sport" mode (loud exhaust and different throttle response) also increases the point at which the TC will step in.
Someone please correct me if I'm wrong.
I knew we'd been here before. This was my take on it a while back. Not changed my mind since :floor:
http://www.911uk.com/viewtopic.php?...start=20&sid=e791f54af565d5ebe85f4203025b4ab8
Diggermeister said:I was definitely under the impression, on the 997.1 GT3, that TC off meant the rear brakes no longer played a part in the correction of the diff.
Furthermore, FWIW, when TC is left on, switching to "sport" mode (loud exhaust and different throttle response) also increases the point at which the TC will step in.
Someone please correct me if I'm wrong.
As Roro says, it's deja vu all over again! I do now remember the thread Senoj mined from the archives.Cunno said:Diggermeister said:I was definitely under the impression, on the 997.1 GT3, that TC off meant the rear brakes no longer played a part in the correction of the diff.
Furthermore, FWIW, when TC is left on, switching to "sport" mode (loud exhaust and different throttle response) also increases the point at which the TC will step in.
Someone please correct me if I'm wrong.
So I'm no expert here but from what I've read the 7.1 TC is off when turned off but the ABD (Active Brake Diffirential) part remains on, otherwise you lose part of the diff workings when you turn off TC. First page on this thread that we have discussed before.
https://www.pistonheads.com/gassing/topic.asp?h=0&f=48&t=1250316&i=8
From personal experience with my car I never found that having the TC off actually helped the rear brake wear a great deal. It was only when I changed ramp angles to 40/60 that the rear brakes stopped aiding the mechanical diff and rear brake life doubled. For me this confirms Fioran0 comments.
GTTommy said:Anyone got any experience of the RPM technik clutch pack?
Seems they are offering their own plates these days
Ah good find, thanks for the info!NXI20 said:GTTommy said:Anyone got any experience of the RPM technik clutch pack?
Seems they are offering their own plates these days
Think you'll find they use the Gripper plates BICBW.
This seems to confirm it:
https://gripperlsd.com/product/porsche-997/
GTTommy said:I was originally planning on guards 40/60 :dont know: