Ernest72

I have been doing both with engine running. But you can do it with the car engine off and on a 40amp charger to be safe. But honestly the coding is so fast that the battery should be fine. It’s not long like a tune that writes to the ECU. The coding for what I have changed has never taken more than 5 seconds. But god forbid it went dead at that exact moment, who knows what would.happen. Don’t want to brick an ecu so use a charger or keep the car on.

gedwin

I would like to add to the above caution. He isn't kidding. I have done many coding and tune changes without a charger, before I knew I should be using one. I had no problems. But one day I was loading a tune with a fully charged battery (this takes several minutes, not a quick 5 second code) and car went into a power shutdown as it recognized a low power condition. What happened after was very unsettling. Tons of errors, beeps, clicks, no start, disturbing messages regarding the ECU. I thought for sure I bricked the ECU. Luckily, the FVD tool I was using for the tune install had a recovery function, and upon running it, all was sorted.

You don't want to experience what I did. Learn from my mistake! Use a charger with a power supply. Not all charges have this function. Porsche recommends 40 amps, I think for lots of safety overhead. Some have been very successful with 15 amps. I have a 25 amp unit, which with a full battery, works fine for my needs. A 40 amp power supply is expensive. You may get away without using one, but you won't be happy if you don't. I would guess if the engine is running, you are probably ok, but don't think all coding can be done with the engine running.

saabin

I had a very similar situation back with my 987 Cayman maaany years ago and the MyGenius FVD programmer. I was really sweating it thinking I had bricked my ECU.

nhnguy12

Just adding an additional data point. I typically do the EPS and PTV coding for people with the engine running at idle for that extra peace of mind.

kwikit356

This is all great information! Generally, when I try to code any car I hook it up to a battery charger. I did not even know that our cars would allow coding changes while the engine was on and idling. I still have not changed the EPS software on my '16 Spyder- I forgot during the service last fall. I can hardly wait to get the car out of winter storage to try this! Thanks everyone.

Richard.

excellent so when I do the PDK gearbox reset, which requires the engine running, I dont also need to hook up to a battery charger?

nhnguy12

That's correct. I've performed the calibration procedure 3 times (twice on my car and once on a friend's) and didn't need a charger at any point.

Mike981S

Do we know if this can also be set via a ODB2 tool like the LAUNCH X431 CRP919X?

Richard.

My concern here is that if I look at Jeff's PDK Recalibration video, PIWIS 2 instructions say that you have to be connected to a charger but if I do this in my multi-owner underground garage with car engine running for 20 mins connected to a mains electric supported battery power supply, one of my neighbors will likely call the police or I will asphyxiate myself, so I would love to do this in a remote outside car park with my fully charged laptop.

There will be no issues with his?

chase15

I have also done this 3 times. Once with my car inside my garage, not hooked up on a charger. The other two was in a parking lot for my friends 981s at a coffee shop. Never had any problem with calibrating them.

futuregopher

is there any way to revert the upgrade back to default? I don't want it to revert to default factory but I am worried that my PDK service at the dealer will somehow revert it back to normal if/when they disconnect the battery.

nhnguy12

Added another member to the GT3 steering cult club

jago

hi where is this pic taken please?

nhnguy12

Tortilla Flat, AZ

jago

nice.