DIY 958 (Aftermarket) Trailer Hitch Receiver Installation
06-05-2020, 12:16 PM
#31
Burning Brakes
06-05-2020, 03:10 PM
#32
Short answer - resistance.
Longer answer - As best i can figure out, if the circuit is "open", the car says no trailer connected. The phenomenon that we've seen with LED lights barely flickering every few seconds when plugged in supports my theory that the trailer module tries to send a low voltage "pulse" every few seconds to the trailer's parking light circuit. If there's an amperage draw, then the car says "trailer connected". If not, no trailer connected.
@RS-America - Is Otis equipped with rear parking sensors, LCA, or a rear view camera? What I've noticed when the car thinks a trailer is connected as I drive away, the following happens:
1: A message in the MFD pops up saying something along the lines of "LCA unavailable trailer mode not possible", and the LCA is turned off.
2: When reversing, I no longer get the lines on the rear view camera that move with the angle of the steering wheel (and a message about trailer on that screen)
3: Rear parking sensors are disabled.
I'd be REALLY curious if you get the same message with your auxillary lights, since those are just trailer lights themselves?
Longer answer - As best i can figure out, if the circuit is "open", the car says no trailer connected. The phenomenon that we've seen with LED lights barely flickering every few seconds when plugged in supports my theory that the trailer module tries to send a low voltage "pulse" every few seconds to the trailer's parking light circuit. If there's an amperage draw, then the car says "trailer connected". If not, no trailer connected.
@RS-America - Is Otis equipped with rear parking sensors, LCA, or a rear view camera? What I've noticed when the car thinks a trailer is connected as I drive away, the following happens:
1: A message in the MFD pops up saying something along the lines of "LCA unavailable trailer mode not possible", and the LCA is turned off.
2: When reversing, I no longer get the lines on the rear view camera that move with the angle of the steering wheel (and a message about trailer on that screen)
3: Rear parking sensors are disabled.
I'd be REALLY curious if you get the same message with your auxillary lights, since those are just trailer lights themselves?
We do not have either LCA or the rear view camera. Wish we had gotten LCA
Our rear parking sensors are above the tire carrier - so no problem
Our front parking sensors were relocated into the bush bar and work as normal, except when we have our front 2" receiver mounted.
.
We have used the parking sensor disable switch:
The only other parking sensor issue we have is when they get obliterated with mud as in the photo above or
in the rally to the Arctic Ocean this past March where they were obliterated with snow and ice. Had so much ice that the tailgate was frozen shut and stayed so as temps were -20 to -30F.
Article about this winters rally - https://www.pca.org/news/2020-04-20/...can-5000-rally
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___________________________
https://rennlist.com/forums/cayenne-...meet-otis.html
Awaiting the start of the next rally stage
04-14-2021, 03:02 PM
#35
FYI, my dealer quoted me $2846.32 plus tax for trailer hitch installation on my 2013 Cayenne S on Florida's Space Coast. Instead, I'm ordering the OEM hitch from Suncoast at $1050 + $30 for the wiring adapter and planning to install myself. Suncoast estimated $240 for shipping - freight, but that's still cheaper than buying from my local dealer who quoted me $1347 for the hitch alone.
I'll plan to post an update after my install to let you know how it goes.
I'll plan to post an update after my install to let you know how it goes.
04-14-2021, 03:19 PM
#36
4th Gear
Join Date: Feb 2021
Location: NJ
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03-27-2022, 04:47 PM
#39
Track Day
I know that this is an old thread, but does anyone know what the proper torque spec for the 8 M12 bolts which attach the hitch to the chassis and suspect that I might also be yielding some of the others.? The only figure I found was 82ft-lbs (111Nm), but using this, I snapped one bolt off and considerably necked another. I assumed that maybe it should have been 82Nm, which is what BMW lists for an M12 8.8 bolt (incidentally, the same BMW table lists 115Nm for a 10.9), but I don't see any other specs out there.
Thanks!
Thanks!
03-28-2022, 04:49 AM
#40
Intermediate
I know that this is an old thread, but does anyone know what the proper torque spec for the 8 M12 bolts which attach the hitch to the chassis and suspect that I might also be yielding some of the others.? The only figure I found was 82ft-lbs (111Nm), but using this, I snapped one bolt off and considerably necked another. I assumed that maybe it should have been 82Nm, which is what BMW lists for an M12 8.8 bolt (incidentally, the same BMW table lists 115Nm for a 10.9), but I don't see any other specs out there.
Thanks!
Thanks!
04-21-2022, 01:01 PM
#41
Track Day
For anyone installing a hitch after this, I have a hint. The hitch bar itself is heavy. I threaded a couple of wheel studs loosely into the upper, inner bolt holes in order to be able to hang the hitch bar on while installing the bolts. Takes a couple of extra minutes to do this, but then no trying to negotiate a heavy hitch bar in place while trying to thread in bolts.
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lml999 (04-21-2022)
04-22-2022, 06:30 AM
#42
Intermediate
I got some new bolts (which are 8.8), with a couple extras and started to tighten them. Low and behold, with two different torque wrenches, 82ft-lbs begins to deform the bolts. Perhaps this is correct, but I'm not sure if they're supposed to be torque-to-yield bolts, although I did find one reference somewhere about not reusing them. I settled on using Loctite 263 and torquing the bolts to 82Nm (~60-61 ft-lbs). I marked them so that I can see if there are issues with them backing out, but I can't find anything definitive.
I just successfully installed my towbar on my Cayenne Diesel using those instructions and torqued all the bolts to 120 Nm without issue. None of the bolts looked particularly over-stressed. Maybe you were getting some binding in the bolt holes? Did you test screw in the bolts before trying to mount the bar? The instructions do mention that you may need to check that the threads aren't dirty and to run a tap through if necessary.For anyone installing a hitch after this, I have a hint. The hitch bar itself is heavy. I threaded a couple of wheel studs loosely into the upper, inner bolt holes in order to be able to hang the hitch bar on while installing the bolts. Takes a couple of extra minutes to do this, but then no trying to negotiate a heavy hitch bar in place while trying to thread in bolts.
Last edited by Peter Ogden; 04-22-2022 at 06:41 AM.