Why cant I run my M52 in OBD2 configuration on my swap?

[etxxz]

a good read:

http://www.europeantransmissions.com/Bulletin/DTC.BMW/understandthe%20EWS%20BMW.pdf

pretty much sums up how EWS works and how it communicates with they key and dme...digital signal etc etc etc i'm waiting on the transmitter module to start my car o.O

[Funkmasta]

I don't know why anyone would want to go through so much headache to have a less efficient engine...

The OBD1 swap is EASY. Really, it is. there is ONE c101 connector (instead of up to 3 on the OBD2 cars).

You have Much much MUCH more to wire in an OBD2 conversion than you would to run into in the obd1 swap.

Think about it this way...
You can swap your motor to obd1, or you can swap your chassis to obd2. The answer is a no-brainer to me. Especially when the obd1 swap will yield you approx 10% over the exact same setup as obd2.

[jrez]

obd1 swap will yield you approx 10% over the exact same setup as obd2.



Do you have any dyno comparisons to back this up?

[FredK]

That is just plain wrong. The gains from the OBD-I swap are from the M50 manifold. If you stuck an M50 manifold onto an M/S52, you'd see similar gains.

[Funkmasta]

The OBD1 manifold is part of the OBD1 swap though...

you might as well save yourself the effort and do the full obd1 swap

[etxxz]

my s52 already han an m50 mani (self made kit hella simple too) and i'm attemting the obdII becuase the obdI swap is not as simple (or CHEAP) as you think, its not the new harness kind of a thing. The "much much much" wiring may just seem complex, but this is depending on what the person can do. As i'm noticing from the wiring squematics that i'm drawing up for my car, the only complication is having two keys and allowing the stock key to crank your starter....you'll still have ONE C101/x20 connection though

i understand your point, really, i'm not trying to fight or put you down, but i think your comments solely based on the fact that everyone does obdI and there's tons of info available. Not taking into account cheaper aftermarket software upgrade (and just a tad cheaper) or maybe simpler tunning when going FI, i didnt see benefit to going obdI since the obdII computer will run the engine better all day any day no?

bimmerforums also seems to disagree on the mod "undfriendly" obdII with no explanation as to why so i must be hardheaded. so, to stay on topic, can someone for once clear up why going OBDI is better?

[Mike B.]

As i'm noticing from the wiring squematics that i'm drawing up for my car, the only complication is having two keys and allowing the stock key to crank your starter....

Just mount all of the EWS-II parts in the glove box and tape the key to the ring antenna. You don't need the tumbler assembly if you want to ditch it. All the E36 key does is send a signal. No issues with having two keys.

The nice thing is that you can always remove the E36 key from the glove box and the car is immobilized.

[etxxz]

^^ yep that's what i had in mind, saw a picture of someone on this forum with that setup and the idea of the e36 key also acting as your added security/immobilizer. Is this what you did?

As the link i posted above says. Ring antenna induces current into the key, reads the chip and is interpreted by the trasmitter module which if its correct when compared to the EWS II module, the ecu disables the immobilization and allows spark and fuel = fire up! electrically speaking, you can apparently crank the starter regardless of the validity of this digital signal ("digital" to the ecu so says link, refering to the question in previous page :D)

all of this meaning that the wiring is not all that dificult if you are capable of making your own c101/x20 wiring adapter.

[Mike B.]

That is where I have mine mounted. I used some nice industrial velcro and the pieces are securely mounted in place.

Wiring EWS-II is really quite simple if you can handle the C101/X20 adapter.

[PiercedE30]

bimmerforums also seems to disagree on the mod "undfriendly" obdII with no explanation as to why so i must be hardheaded. so, to stay on topic, can someone for once clear up why going OBDI is better?

OBDI is familiar to most people. The thing is that most people are afraid to tackle the OBDII stuff and just go the easy way.

[jrez]

mines mounted to the dash kick panel, above my right knee. I also got a discount on my insurance due to the immobilizer benefit. The rest of the stuff is also mounted in the kick panel. No visible evidence unless you look inside the dash area.

The m50 intake is not a mandatory piece for the swap. Im using the obd2 mani, and it fit fine. I have a m50 one also that I am planning to install.
Like I said before, prove this "10%" gain. I've heard this argument from day one, but I've never seen comparative numbers for the same engine, with different engine management. I have seen dyno charts for obd2, and they run 200 - 220ish WHEEL hp. Factor in 20 -30% friction losses from the drivetrain, and you'll get an idea what is at the crank.

[etxxz]

MDRFKN WHUUAAAAAT!!!!! HUSTON, WE HAVE INGTION!! fired ~10min ago. OBDII all day, all nigh! AND an M50 manifold :finger: auu snap. firts time took a couple of turns and then it fired up. damn i'm so happy

OBDI is familiar to most people. The thing is that most people are afraid to tackle the OBDII stuff and just go the easy way.

the reason i didnt post i didnt post earlier is becuase i didnt want to say something like OBDII is a LOT easier than OBDI...obdI conversions are a PITA and this was so simple, even the c101/x20 adaptor and extra 5-6 wires that you have to run........keep in mind this is the FIRST engine i wire in ever my life.

as far as it being familiar YES, i completely agree, but not after i post up what i have done for the obdII community....its etxx's obdII wiring kamasutra 2007 christmas package, but i should probably make a thread just for that. all of the info (minus my adapter chart) are on the internet you just gotta find them.

OKay time to cleanup, my car rolls out this weekend....shit's hella loud... so much for driving w.o exhaust to the shop. ok ok this nigga out! peeice!

[Teaguer]

MDRFKN WHUUAAAAAT!!!!! HUSTON, WE HAVE INGTION!! fired ~10min ago. OBDII all day, all nigh! AND an M50 manifold :finger: auu snap. firts time took a couple of turns and then it fired up. damn i'm so happy

Congrats on getting it to fire ....esp with keeping OBDII . :up:

[surebimmer]

So did you keep all 4 02 sensors? That was a big part of why i didn't want to go OBD 2. Also its easier to get a 95 Motor to be smog certified for CA SMOG. Don't have to have the tank leak module that the OBD 2 cars have.

[etxxz]

^^i see, i really wasnt counting much on emissions (FL). i have all 4 O2's, but no real desicion on exhaust/cats