Turns out we're both wrong.
On the E46, the IHKA module signals the DME to turn on the air conditioning and gives it the torque consumption via the CAN-bus (through the intstrument cluster). The DME is what turns on the compressor, and uses the torque load information to maintain a steady idle. Also, the DME controls the aux fan via a PWM signal based on coolant temperature and the speed the IHKA is requesting (the DME will go with whichever requests the higher speed).
On the Z3M, there is no IHKA module. So the AC is pretty much wired up like it would be on any other E36. Main difference is that instead of the compressor on signal being sent directly to the DME, it is sent to the cluster (which presumably sends the DME a signal to turn on the compressor to the CAN-bus). The aux fan's high-speed circuit is triggered by the DME.
So in "E36 mode" the DME figures out the torque consumption on its own, but the part I was missing was the instrument cluster's involvement. So you will still need a module to tell the CAN-bus that the AC button is pressed. If you leave the AC constantly on, I guess one could hardcode the software to think the AC is always requested on.
Edit: Actually, the signal to turn on the AC is over the K-bus rather than the CAN-bus.
Last edited by TerraPhantm; 07-27-2015 at 02:51 AM.
Current:
1983 E21 320I ''Trusty stead!'' Ireland engineering suspension, solid strut bar, all stock
1995 E36 ///M3 ''Could it be love? it is!'' so Much $$$$$ Dumped on this car!
2002 E39 ///M5 ''Angry little thing!'' dinan tune, dinan diff, supersprint exhaust system overhaul...
The goners:
1992 E30 318is slicktop ''Knuckles'' volvo lip, full stock
1992 E36 320i ''You did good little one'' Full stock
1988 w124 Mercedes 250d ''Best car ever...EVER!'' Bone stock!
Whatever you can ''faster'', I can do ''faster''!
Nah brother!
I m the black sheep here. For most people doing standalone ems means going for dta, haltec, aem. Not this guy right here!
I'm using a specialist component uk management system
Let me get out there to the shop here in a few and i ll take some pictures.
Snd btw heath works, climate module and controls are still in place. I just never did put the ac comp on the car for 2 reasons.
1- I was too happy the car was runing
2- had to do a lot of road tuning and the ac was not a priority.
Current:
1983 E21 320I ''Trusty stead!'' Ireland engineering suspension, solid strut bar, all stock
1995 E36 ///M3 ''Could it be love? it is!'' so Much $$$$$ Dumped on this car!
2002 E39 ///M5 ''Angry little thing!'' dinan tune, dinan diff, supersprint exhaust system overhaul...
The goners:
1992 E30 318is slicktop ''Knuckles'' volvo lip, full stock
1992 E36 320i ''You did good little one'' Full stock
1988 w124 Mercedes 250d ''Best car ever...EVER!'' Bone stock!
Whatever you can ''faster'', I can do ''faster''!
Well in any case I'd wire it like I show above. Unlike a stock setup, the AC won't turn off in full load operation.
Current:
1983 E21 320I ''Trusty stead!'' Ireland engineering suspension, solid strut bar, all stock
1995 E36 ///M3 ''Could it be love? it is!'' so Much $$$$$ Dumped on this car!
2002 E39 ///M5 ''Angry little thing!'' dinan tune, dinan diff, supersprint exhaust system overhaul...
The goners:
1992 E30 318is slicktop ''Knuckles'' volvo lip, full stock
1992 E36 320i ''You did good little one'' Full stock
1988 w124 Mercedes 250d ''Best car ever...EVER!'' Bone stock!
Whatever you can ''faster'', I can do ''faster''!
Do you need to swap in the s54 fuel pump (or does s52 pump work)? Does the s54 have a separate fuel pressure regulator?
S54 swap DME flashing - $100
S54 swap CAN interface board (for proper A/C & check engine light) - $275
e36 SAP sim/secondary air pump simulator: $75 - standard or $170 - plug & play
e36 post-cat O2 sims: $115 shipped, plug & play
I think this power steering hose http://www.realoem.com/bmw/enUS/show...27#32411093461 should work it has the right end for the PS pump
If anyone is interested, im selling my complete s54 e36 swap with all brand new parts here. Includes trans, complete engine, accessories, etc.
https://www.bimmerforums.com/forum/s...in-parts-6-750
For anyone that wants the coding for free, or further info, TunerPro XDFs are here along with directions and youtube vid:
https://github.com/saildot4k/MSS54-XDFs/
For AC, user GPeterson made an AC Controller:
https://www.bimmerforums.com/forum/s...proper-CEL-A-C
'90 325i: S52+C&S chip, 5 Lug, ZF320, 2.93 LSD
RIP: '88 325is: M50B25TU+M3 Cam+Turner Chip, ZF320+ 2.93 LSD
Mine works fine. Elaborate?
'90 325i: S52+C&S chip, 5 Lug, ZF320, 2.93 LSD
RIP: '88 325is: M50B25TU+M3 Cam+Turner Chip, ZF320+ 2.93 LSD
they were built with no heat sink and over heat at some point, causing a failure, and his box also allows the SES light and you wont know if you throw a code. best bet is to get an 01-04 Z3 cluster and have it repinned to the E36 plug, easy to do, user busterhaux makes them.
98 Estoril ///M3 4/6
S54 swap CSL
Hey party people, who is flashing MSS54HP DMEs these days for swaps?
Thought I would ask here before I just LMGTFY
Yes. Note that cruise has nothing to do with CAN, other than an optional visual indicator for cruise off/on.
For anyone that does the Z3 CAN cluster - I documented the pinout differences and made notes on what you need to do:
https://docs.google.com/spreadsheets...it?usp=sharing
If you need odometer correction on a used cluster I can help with that as well.
Last edited by gpeterson; 09-30-2019 at 01:09 PM.
S54 swap DME flashing - $100
S54 swap CAN interface board (for proper A/C & check engine light) - $275
e36 SAP sim/secondary air pump simulator: $75 - standard or $170 - plug & play
e36 post-cat O2 sims: $115 shipped, plug & play
All great stuff here!
Is it possible to run two different tunes and switch between them on the fly?
I'm considering a race tune where the smog equipment isn't used or is disabled via the DME and exhaust headers lacking catalytic converters are present for increased power
and
a SMOG tune whereby all the O2 sensors, EGT probe and SAP is used by the car to pass emissions
Would this require having two different DMEs and physically swapping them in and out with the exhaust parts?
I know with the Evo I had you could flash in two maps and switch between them by holding down the throttle when turning the ignition on.
What do people do to retain ABS communication to the OBDII plug?
If you are using the ABS harness from 3dm Motorsport, it has its own OBDII port you would plug into.
https://3dmmotorsport.com/collection...ness-basic-kit
This is the harness I’m interested in using for this swap as well.
I’m looking to communicate to the factory E36 ABS from the OBDII plug.
I’ve had no luck with stock E36 ABS, MK60 systems communicate flawlessly though.
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