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Old 11-11-2004, 11:42 PM   #1
maurolin
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Default an OBD1 conversion story

Here's the story of my first S52 OBD1 conversion into my 1995 318ti. this is a BRIEF overview. I might miss some stuff... so feel free to add to it!.

I went to a junker and bought a 325i 1995 auto wiring harness, a 413 DME and an intake manifold with a fuel rail.
All this was going to go in a 1995 318ti which gave me an advantage for the car being OBD1 already.(no need to replace EWS or key) sync dme only. I have the scan tool

Then I started looking for all the needed sensors and parts to complete the kit.
Cam shaft sensor (side of the vanos. USE a obd1 sensor because of the connector)
Crank shaft sensor on the OBD2 is located on the back left side of the engine and it will NOT be used. you leave the obd2 sensor there unplugged. The cracnk shaft sensor is actually located on the front of the engine reading the harmonic balancer (USE OBD1 or 2 MANUAL TRANS! H BALANCER) and that's one of the most importants sensors on your conversion.
The OBD2 Knock sensore CAN be used, but you need to find the OBD1 connectors to SOLDER and attach. Make sure there is NO loss or gain on the resistance., but if you can afford to get new OBD1 knock sensors.. that's the way to go.
Temp sensors on the Head. This is where it gets pretty tricky. OBD1 had 2 sensors on the left side of the head beneth the manifold. 2 sensors 4 leads, 2 connectors. OBD2 has 1 sensor, 4 leads 1 connector. you CAN use the OBD2 sensor and split the 4 leads into 2 connectors. (Connectors are found at shops junk yards etc. or make your own, but more work.) this is what I did. I used the OBD2 plug, otherwise I would of had to drill and Tap the head for the second Temp sensor, and that is no fun... to risky.
The Valve cover. This is where you need to get creative. OBD1 metal cover, OBD2 plastic cover. The MAIN purpose of this is to remove the cyclonic oil separator which is at the other end of the plastic hose that connects onto the left front side of the head on the OBD2. That hose and the oil separator will be removed and replaced by the OBD1 nozzle that you need to grind down till it fits with the "O" ring in the obd2 plastic inlet of the Head. then attach a hose to one of the 2 ports the OBD1 throttle boot has. (you need an OBD1 throttle boot and coupling)
OBD2 has a bunch of vacums under the manifold, but only 1 will be removed. It is the Exhaust flaf vacul. a Black hose with a blue strip and a white pcv valve on it. GONE. The Manifold. This is the "hard part". (just cause I hate it) but you need an OBD1 idle control valve and hoses, and the OBD2 manifold has the bolts that hold the plate that hold the dip stick closer toghether than the obd1, so I cut the plate in 1/2 and got 2 plates out of 1. Now, the dip stick would work BEST if you replace the oil pan for the OBD1 but IT IS NOT WORTH IT!. make a new plate!.
You can use either the OBD2 OR OBD1 throtthe body. you should change the boot to obd1. and while you are at it, if there is no snow where you live... remove the heatting hoses from the trottle body and loop them straight toghether. You also need an OBD1 HFM Air flow meter but if you are going through all this hassle, GET THE EURO HFM.
Then you have the charcoal canisters and tank ventilation valves whick must be installed.
now... the EXHAUST MANIFOLDS! wow... this was a PITA. Take e'm off. remove the secondary air supply and injection pipes.
What I did is I had the OBD2 Steel manifolds weldded shut (2 grooves where the air gets injected into the system) and I read that the cast iron OBD1 ones cannot be weldded, they are Heavier, rust nasty and are less heat efficient. I left the PRE CAT o2 sensors on the manifolds and cut off the cables. (you can use them for EGT gauges or Stoich/rich gauges)

The fuel pump. Ofcourse... more volumen. i used a 1995 M3 one.
Easy swap, bad smell.

Get an 80 degree thermostat and a new temp sensor for the radiator... yes you need a 6 cyl. radiator.

Finally the exhaust. OBD1 has 1 PRE cat o2 sensor that measures BOTH (1-3 and 3-6) pipes. I used t5he OBD1 mid pipe. While you are at it... remove the cats (no I NEVER did this! EHHMmm) for the OBD2 mid pipe, remove cats and have a muffler shop weld an o2 sensor thread between the 2 pipes on a bridge.
The software: In my case.. 3.2L S52 HFM, Flywheel, CAI, Trackpipe, Fan delete mod, 21.5 injectors(stock obd2) $350 from Active autowerks.

The tranny from a manual Ti is the same as that of the '95 M3.

I forgot to mention that the 318Ti sway bar needs to go (rubbs with the oil pan) the cluster needs to be changed or you'll be reading 8K RPMs when the car is really at 3500,
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Old 11-12-2004, 03:27 AM   #2
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I'm probably missing something here, but why did you want to go to OBD1 from OBD2?
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Old 11-12-2004, 03:16 PM   #3
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ok. the car was OBD1, the engine was OBD2. Either I convert the interior wiring harness and add all those nasty after cat o2 sensors, and all the restrictions from an OBD2 S52 or open up some power and easier tuning and convert the S52 to OBD1.

The car will have a supercharger before next summer, and will like to change a chip and done for tuning. not send out my ecu, re program and not be able to do any mapping,.
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Old 11-14-2004, 02:34 AM   #4
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so are all Ti 5-speeds the SAME, like EXACT SAME as the m3 5-speeds...gearing and everything? Clutch and slave cylinder would be different probably...but is everything else the same?
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Old 11-14-2004, 06:03 PM   #5
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clutch is different, slave different, but the gearing and tranny have the same past number (at least mine on the 1995) as the 1995 M3. Shifter carrier is a bit different as well. but you can use the Ti one.
There are 2 different trannys on the M3's Getrab and ***** can't remember.... the gearing is ALMOST the same. I have the gearing ratios for ALL 3 series e36 in my Bentley manual. it states the Ti uses the same tranny as the 1995 M3
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Old 11-15-2004, 01:38 AM   #6
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So do the m42s and m44s use the same tranny? If so that would mean the pre-95s would all use the same tranny. I am probably going to buy an m42 at this point for stoutness.
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Old 11-15-2004, 03:30 AM   #7
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mine was an M42. has the same 1995 M3 tranny. the 1996+ OBD2 M3's have a different tranny (brand gear ratio) but is the exact housing so it fits the 95.
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Old 12-21-2004, 12:13 AM   #8
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ok, so the engine is completly done except for the HFM that I am waiting on the mail (3.5")
now.... the next step it the paint shop!.
M3 mirrors, new M3 bumper, reiger roof spoiler, ac schnitzer spoiler, hamann style splitter, re paint the hood and front grill panel, and either a new M rear bumper or re paint fully black the oem bumper. (I had to slightly ENLARGE the hole for the exhaust on my bumper with the help of a saw and grinder....
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Old 01-06-2005, 04:15 AM   #9
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got the HFM.... now... I need an intake to complete.... anyone have a 3.'" intake???

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Old 01-06-2005, 05:09 AM   #10
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There are a bunch of euro airboxes for sale on turner's site, or on roadfly... I don't recall where I last saw them. I have a couple coming from europe, but they won't be here for a while. You could also do a Dinan "cold air intake", they must have a version that works with euro HFM, or, best of all, get the conforti shield, downtube and ITG filter. Lots of choices.
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Old 01-06-2005, 04:03 PM   #11
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I had the shield, but the pipe is now too big.....
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Old 01-06-2005, 05:33 PM   #12
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Nice photo. Well, I'd sell the old shield/pipe/filter to someone who can use it with the smaller hfm you used to have... ie some 325 or US stock M3 driver... and go buy the right pipe/shield/filter... its a nice set up.

Just MHO
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