pcmhacking.net

So is it like versions? For instance why is $12p $12p?

$ in some languages means hex. P in this case means "pro" as in more features. $12, as in 0x12 (another way of writing 12 in hex) means factory $12 code, which is the version released for the VR V6, with the 8192 baud computer and as many factory refinements as exist. "pro" includes boost support and flex outputs and 128 byte packet size (for speed) and all the other goodies vl400 added to the code. See http://pcmhacking.net/memcals.html

OK, two more I'd like to know : MDI and RFI. If the latter is Radio Frequency Interference, what has that got to do with Police versions of ECU code?

Joe.

all the high powered transmitters, radios and equipment in a police car has the potential to induce interference within the ECU circuits possibly causing hiccups, CPU crashes, glitches etc.

The shielding provides extra protection from this.

TdracerTd wrote:So is it like versions? For instance why is $12p $12p?

Just to also add why the P was for pro, there was actually an unreleased S version originally. It was a sort of proof it was all going to work, being from a disassembled bin and made in to source code there was a heap that could go wrong. So it had no extra engine functions added, was only things like the NVRAM write, larger packet sizes and calibration memory allocation change. Was ran by a few early adopters in various cars.

On a side note the current 12PV112 is 34572 lines of assembly code (includes comments though), 11P is 56054 lines

j_ds_au wrote:MDI

Multiple Diagnostic Interface

As above for rfi. Also worth noting the code is not different in an rfi pcm, just it uses a metal socket where the loom enters the pcm instead of plastic. The metal connector uses the same pin configuration but has different keyways so you cant plug the regular connector in to the metal socket.

excuse the ignorance, but why would it have a metal socket??? so it can be earthed???

why don't they use the same protection now??? was it all BS...

Because metal blocks radio interference (especially when earthed) and plastic doesnt. How much of a difference it makes in this case, I dont know. The interference can get through the wire insulation, but perhaps it does help keep it from directly entering the main board. They probably had a design target to meet and the metal plug made the difference needed. I dont know what they currently do - are you saying the pcms are standard? But if the ecms are under the bonnet rather than in the cabin maybe its a better spot as the car body and bonnet block the signals better than in the cabin where it can get in through the windows. But then its closer to spark interfearance. Perhaps the metal shielding on the more modern regular PCMs is better. I know the 0411 on my desk has metal around the connector ingress point in the standard configuration.

General information: http://en.wikipedia.org/wiki/Electromag ... terference and http://en.wikipedia.org/wiki/Faraday_cage

thanks antus, makes sense

VL400 wrote:

TdracerTd wrote:So is it like versions? For instance why is $12p $12p?

Just to also add why the P was for pro, there was actually an unreleased S version originally. It was a sort of proof it was all going to work, being from a disassembled bin and made in to source code there was a heap that could go wrong. So it had no extra engine functions added, was only things like the NVRAM write, larger packet sizes and calibration memory allocation change. Was ran by a few early adopters in various cars.

On a side note the current 12PV112 is 34572 lines of assembly code (includes comments though), 11P is 56054 lines

antus wrote:$ in some languages means hex. P in this case means "pro" as in more features. $12, as in 0x12 (another way of writing 12 in hex) means factory $12 code, which is the version released for the VR V6, with the 8192 baud computer and as many factory refinements as exist. "pro" includes boost support and flex outputs and 128 byte packet size (for speed) and all the other goodies vl400 added to the code. See http://pcmhacking.net/memcals.html

Cool stuff. I like finding out this sort of info.

Off topic I know, but will $12p ever support spark cut? or is this a hardware limitation?

Thanks