siberian

The ground strap has electronics embedded in it (compared to the engine ground strap located beneath the engine) but it is accessible from within the frunk compartment and battery location TTBOMK.

siberian

981KMAN

My apologies for the confusion. My 2019 Targa 4GTS, manufactured in October of 2019 came with an AGM battery. My input was that the AGM battery works well with the RWS system. As I have no issues and I can clearly see the rear wheel move, at least at low speeds when parking.

Also that there are several OBDII devices that work with the 991.2 & 992 series 911s that will register a new battery in the BMS. So you don't have to be "stuck" with the LiPo battery if you do not want one. You have options if you so choose.

Again, my apologies for not being clear.

okatz901

Hey all - so, okay, received my battery charger to be prepared for the next long(er) term idle period, but I seem to have the same issue as I had with my battery jumper. The cables it comes with can't reach both the positive and negative posts in my 2017 Panamera 4s. They're quite widespread. Any suggestions how to get around that or need to find a battery charger that simply has longer cables?? TYIA

22992

You just pull them apart, if too difficult make a small incision between the positive and negative cable where they separate with a utility knife then pull them apart. The + and - are separately insulated.

okatz901

Thanks but I don't think even doing so on the unit I bought gives me enough length! I bought CTK 56-926 LITHIUM US. On my vehicle, the negative is was up towards the top of the engine area while the positive is on the battery.

Fullyield

Well, your DIY comment is confused on multiple points. You cannot switch between Li battery and AGM battery on the 992 as Siberian and others correctly point out. You also cannot switch between RWS and AGM in the 992 BMS with any OBD device including PIWIS. Even the dealer cannot do it. Finally, there is no OBD device currently available to program the BMS on the 992 for $80. That is what this thread is about……Porsche’s proprietary BS.

Antigravity

IF you have a multi-meter you can confirm another ground point in this area for the negative connecton of the charger... just make sure it isn't a fuel line or thin metal, but a bolt or other steel surface should be fine becasue the dedicated ground post you speak of is simply a good ground, and that is what you need, and there are other in these areas. Make sure there are NO MOVING PARTS in this area also. Additionally depending on the Car you can just simply connect to the batteries positive and negative terminal, in some cars they don't want you doing this due to sensative electronics, but IN GENERAL you can connect to the terminals and not harm anything but it would probably be best to connect the charger before plugging it so you not bouncing the clamps on the Battery Terminal or where they say there is sensative electronics. But alway try to do it the way they recomend firstly.

Vicbastige

I thought there were some examples of people changing Lithium to AGM but that a new ground line was required to do so or am I out there with our Executive?

siberian

IIUC, the LiFePO4 ground cable has a LinBus that feeds into the BMS. You will need to switch out that cable, but I'm unsure as to what the ramifications are of the interrupted data path once the new ground cable is installed.

siberian

Vicbastige

Come to think of it, I recall it was Antigravity that was on this. Hopefully they weigh in on the ability/process if it in fact exists.

981KMAN

No Problem on my end. I kindly suggest that you check out the Thinkcar THINKDIAG Bidirection OBDII Unit which cost about $80 after coupon listed elsewhere on this forum. It has significant ECU Coding capabilities. It might be of value to other members in this forum. Lots of new tools have come out.

siberian

Please see my post above. I don't know what interrupting the LinBus data stream will have. Not sure what your analyzer purports to program concerning BMS. Can you shed some light on what it actually does?

siberian

Mike818

IIRC the deal was that with the LiFePO4 the car plugs straight into the battery. With the AGM the car plugs into the battery cable. If you go from LFP to AGM you need to swap out the cable so the car has something to plug in to. Then you need a PIWIS / aftermarket equiv. to reprogram the car for the battery type.


* by "the car plugs in" I am referring to a communications interface.

Fullyield

Much discussion and some experimentation by Antigravity but nothing currently available to my knowledge. Antigravity is on this thread…..any update?

Fullyield

Hope you are correct. We have a whole separate thread on this. Plenty of OBD2 scanners available for less than $100. No OBD2 scanner for 992 WITH SPECIAL FUNCTIONS (BMS, ABS bleed, oil reset, etc.) currently available other than Autel 808 (and up) starting at $373 and one other for a little more $. Many devices say they are compatible with the 992 but when tested only do the very basic functions of pulling OBD2 codes (AP200, Blue Driver, Foxwell, etc.). If you have a Thinkcar device, please thoroughly test it with a 992 and then give us a write up. All of us would love for you to prove me wrong. If it will just do oil reset, they will sell very well at $100.

UPDATE - I just went to the link provided for Thinkcar. It does not list BMS, ABS Bleed or Oil Reset for functions available for the 992. . However, it does list rear spoiler as a function. This might be of interest to the group installing Moshammer ducktails and aero kits as they are having to go to the dealer for reprogramming after install. Might be worth a try for $100.