Zepper

I searched this forum, both posts and threads for any info on how to disable the hill hold (on a 987.2) but didn't find anything.

Been driving a manual for a long time and I really don't need this 'feature.' Our driveway is really steep and i have to stop at the top to look for cars before turning out on the street. I just feel like the hillhold requires the engine revs to be too high before releasing the brakes. I have a handbrake Porsche....i'm good with that.

Hoping someone else has figured this out. It would be a dream if it was just as easy as pulling a fuse, but i suspect that if it is possible to disable it, it will require coding at the dealer.

Zepper

Ok no comments thus far. I found this post: https://rennlist.com/forums/718-gts-...e-request.html

The author, i believe, found the way to disable hillhold with PIWIS but it looks like he has a 718. Any idea if our software/operating system (in the 987.2) is the same as in the 718?

Kaefer

If you disable the clutch delay switch under the dash you will disable the hill hold feature. Also the timing retard that takes place when the switch is activated with the clutch pedal is pushed in will be gone, making for a smoother clutch engagement along with a slightly peppier engine right off idle due to the slightly more advanced timing. I consider both of these positive effects.

Something I found interesting before I did this mod - with the clutch delay switch operating as intended listen to the engine at idle with the car in neutral and the clutch pedal engaged, then disengaged. You should notice a subtle difference in the exhaust note when the clutch pedal is pressed down. That's due to the difference of ignition timing due to the clutch delay switch being engaged vs disengaged.

The downside with doing this mod to a 987.2 is the red exclamation light will be illuminated on the dash, along with a drive off assistant warning message every time you start the car. The warning message can go away by pulling the lower left stalk to confirm. The red exclamation point will stay illuminated.

For driving enjoyment I feel the pros outweigh the cons with this mod. I did talk to Scott at Softronic a few years back to see if he could code these features out (to get rid of the warning and red light) but I lost interest in spending the money to get a tune for the purpose of coding out the features.

Try it, see if you like it, and if you don't just re-enable the clutch delay switch.

Zepper

Thanks for the reply and input Kaefer. I think I have an appointment to meet up with another rennlister who has a piwis 3 and we're going to try and code it out. 🤔 it will be interesting to see if there is still the same timing advance with the hill hold being shut off through the operating system.

Kaefer

Of course let us know if you're successful with the piwis!

edub

We were unable to find the hill assist function in the PIWIS 3 v41 software today

Zepper

Thank you again for your help and patience! it was cool to see the piwis software and get to poke around in it a bit.

Aussie skypig

What is the best way to get a PWIS system for my 2006 Cayman S?

I’m pretty ignorant of the system. Does it plug into the OBDII reader?

Zepper

I'll defer to Edub on for the sourcing question. Maybe send him a private msg.

I can confirm it does plug into the OBDII which on my 987.2 was above the fuse panel on the left side of the driver footwell, on the bottom side of the dash where the headlight switch is.

Schwinn

Note, PIWIS connects to the OBD connector, but it does NOT use OBD protocols for communication. It actually uses other pins on the connector to talk directly to the car computers. An OBD reader WILL NOT perform PIWIS functions... only PIWIS does this. A few OBD devices may support SOME functions on the CANBUS (eg, Foxwell NT530) but even those can't do everything PIWIS can.

Technically, PIWIS is a Porsche branded, proprietary tool and is not typically available to the rest of us. However, there are knockoffs out there that sometimes work, and sometimes don't. Even the knockoffs are relatively expensive, so be prepared for that if you're really looking into it. I have heard some positives about VXDAS devices, but am too cheap to buy one myself. I have a Foxwell that does enough for my needs.

Also note, the newest PIWIS3 isn't always recommended for older cars... at least in the case of knockoffs. They don't seem to work as well on older cars, from what I've read from other users.

Aussie skypig

That’s some useful information - thanks.

I’m keen to do what I can myself on my Cayman. So intuitively would like a PIWIS system.
The small European car repair place nearby almost certainly won’t have one.
The Porsche independent specialist who has been maintaining the car for the previous owner could only have a “Knock off”, at best, I assume? (And they are nearly 2 hrs drive away, as are the Porsche Main dealer)
It’s been suggested the Official Porsche Dealer might not be too interested, or even willing, to work on my car. Due to the modded rebuilt engine, and Softronics tune etc.(They are also booked out months in advance - I tried for a PPI)

I’m in Australia, so my options for the “Knock Offs” might be even smaller, and more expensive.

Aussie skypig

Is the PWIS required to set the “auto door lock” to “condition 4” (off/no lock)?