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Old 07-10-2013, 11:31 PM   #1
South
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M52 into OBD1

Hey folks. shitty rain we having. anyway my question is probably simple but I want to be sure from you smart guys.

If I have a obd1 e36 and I want to swap in a m52 from a obd2 car. What do I need and have to do, to make the m52 run in obd1. Any complications?
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Old 07-11-2013, 01:05 AM   #2
oldschool
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The only issues I had was with the coolant temp sensors... The rest is all plug and play
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Old 07-11-2013, 07:44 AM   #3
cormier
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There are a few more things to tackle... If you google it there is a full DIY. E36 to e36 is pretty straightforward
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Old 07-11-2013, 09:11 AM   #4
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If your OBDI e36 is a VANOS motor, you're laughing.

As these guys have said, coolant temp sensor, but you might be lucky and your head may have 2 ports. If so, just swap.

Use the OBDI headers (you'll have to delete the EGR).

Use the OBDI intake manifold, fuel rail, etc..

For ease of routing, you can even use the OBDI valve cover and coils (otherwise you'll have to grind the plastic on your OBDII valve cover).

You'll have to swap some sensors from your OBDI engine to OBDII. Leave the OBDII crank sensor in its spot as a plug.

Read through this... some good info here:

http://www.m3forum.net/m3forum/showthread.php?t=130494
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Old 08-11-2013, 03:36 AM   #5
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I am at the stage of swaping over sensors and parts into the m52 before dropping it in. I was lucky and my m52 has two coolant temp sensor holes so I think I am laughing in that department.

My question is with the fuel injectors. Im planning on using the obd1 fuel rail and manifold, headers, air box....so should I use the pink or green injectors? I get the idea that if I use the pink injectors that I'll need a tuned chip?
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Old 08-11-2013, 04:29 AM   #6
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Its not a big difference between the green and pink injectors... If your running a red label ecu, it makes up for it... I tried both and got the same air/fuel readings
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Old 08-19-2013, 04:28 AM   #7
South
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So the m52 has this thing called a CCV (oil seperator),

In the m52 motor, there is a very apparent hose that connects to the top right of the valve cover. On the m52 this is a plumbers sealed hose that goes into the CCV. The CCV then, is connected directly at the top to the intake manifold and has another hose going down to the m52 dipstick.

In the m50 motor, there is that exact same apparent hose that connects to the top right of the valve cover with a clip style seal. However. This hose has, right before it connects into the valve cover, another small hose that connects into it. This small hose connects right where the ICV hooks up to the m50 manifold. The main hose, which in the m52 goes into the CCV, goes instead in the m50 to the throttle body, right before the valve (pretty sure)

In essence then in the m50, the blow back oil going through the hose from the valve cover is taken into the intake and combusted. Thus burning some oil. And the vacuum that powers this comes from the small hose that is essentially connected to the manifold.

In the m52, instead of the blow back oil being sent to the throttle body, it is instead separated in the CCV and sent to the m52 dipstick. The vacuum that powers this comes from the CCV being directed connected to the manifold.

Anyway, I plan to have install my old m50s intake manifold onto the m52. After all the DIYs and kits, I thought that couldn't I just use my m50 valve cover or do what this guy did http://www.m3forum.net/m3forum/showthread.php?t=130494 (number 9) but instead have the dipstick plugged and the hose leading to the throttle body. Basically the setup of the m50.

Advantages/disadvantages with blow back oil being burned or returned to dipstick un seperated? Probably less cleaning of ICV and throttle body going the above links way?
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Old 08-19-2013, 10:32 AM   #8
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When I had it running straight into the intake, I was burning a LOT of oil. Never did with my M50, and my m52 was brand new - a complete rebuild.

So I bought a catch can and then set it up so it drained back into the pan from the dipstick - never burned oil since.

That being said, for a street car, you aren't allowed any crank case emissions - if you get a catch can, make sure it's vented back to the intake, and then it drains to the oil pan. That's my suggestion!

I think this guy did something similar:

http://www.maxbimmer.com/forums/show...48#post1596848
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Old 08-19-2013, 08:32 PM   #9
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thanks for the info. I think I know what im doing for the ccv.

Can anyone tell me what the object that hoses 15 and 14 plug into in this coolant diagram?

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Old 08-20-2013, 10:51 AM   #10
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It's the thermostat that controls to flow of coolant to the throttle body to prevent icing - this is obviously more likely to happen in the winter but may also happen above freezing temp due to the pressure difference across the throttle plate.
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Last edited by sb_600; 08-20-2013 at 10:59 AM.
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Old 08-20-2013, 10:51 AM   #11
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it senses the air temp from the intake.
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Old 08-30-2013, 01:19 PM   #12
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hooked everything up to new engine. turned key. lights came on, radio etc but no crank no start. Everything is obd1.

looking around some think EWS is the problem. I have a silver 413 DME and the car was built 95. Any help
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Old 08-30-2013, 01:24 PM   #13
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yup - you need a red label or an ECU flash.

Barrie can hook you up with a flash - PM bmwconnect.
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Old 09-03-2013, 10:07 AM   #14
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Quote:
Originally Posted by South View Post
I am at the stage of swaping over sensors and parts into the m52 before dropping it in. I was lucky and my m52 has two coolant temp sensor holes so I think I am laughing in that department.

My question is with the fuel injectors. Im planning on using the obd1 fuel rail and manifold, headers, air box....so should I use the pink or green injectors? I get the idea that if I use the pink injectors that I'll need a tuned chip?
run the pinks. they are 21.5# as opposed to 18# (green). You wont need a chip, but you'll have more options.

Barrie should be contacting you soon - talk to him about all your mods (M50 intake manifold, etc...) and he will be able to boost your power as well as delete the EWS.

Good luck!
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1992 3.0L M52 325i (ex-daily driver - track car only)
2002 330Ci (ex-daily driver - sold!)


Last edited by sb_600; 09-03-2013 at 10:09 AM.
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Old 09-03-2013, 04:09 PM   #15
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I have a red label 413 DME for sale if you like.

PM me.
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