DIY: In depth M52/S52 OBD2 swap

[Varinn]

Can anyone here confirm that this wiring schematic is accurate for a 7/96 S52 OBD2 into a 12/89 325i??

I've built my own spreadsheet that is almost identical to this by using the ETM's but there are a couple small things I'm not 100% sure on. I'd love to save a few bucks on my already stretched budget before I give up and give Dave more of my money to have it done perfectly.


(Note: I did not make this, I take no credit for the work involved I am purely linking to the original poster's image)

[36brua]

Hi guys,

I'm running the Dinan CAI in with my e30 m3 S52 swap, and its not leaving me with a ton of room with the ABS, can someone give me some advice to which K&N filter I can run? I need to pass the Ca. Referee..

Thanks!!:D

I not 100% on this but I don't think the ref is usually too concerned with the inlet side of the MAF. I have a BAR'd swap

[355gto]

Let me clarify, anyone advise me of a REALLY Small K&N filter I can use? Happy 4th!!

[355gto]

HELP! Which K&N filter to run?

Hi guys,

I'm running the Dinan CAI in with my e30 m3 S52 swap, and its not leaving me with a ton of room with the ABS, can someone give me some advice to which K&N filter I can run? I need to pass the Ca. Referee..

Thanks!!:D

[knuklehead92]

does the stock m52/s52 ccv have a built in check valve?? or a check valve in the line that goes into the dipstick tube?

[McDewbie]

awesome, thanks. do these transmissions have mechanical or electrical for the speedo? just wondering cause i will be going standalone ECM. also does the m52b28 oil pan sti low... like scrape low? and if so any solutions? i will be lowering it a little (1"-1.5").

[craiggroves91]

ZF is the manufacturer.

all manual e36 M/S5x cars are equipped with the ZF 5 speed transmission.

There are also two types (that I know of at least)
The ZF310 that came on Pre-1995 and 1995 e36 m3s (maybe more cars)
and the ZF320 that came on 1996-later e36 m3s and m52 cars (again maybe more cars)

The ZF320 is supposed to be a little better as far as I know.

[evandael]

ZF is the manufacturer.

all manual e36 M/S5x cars are equipped with the ZF 5 speed transmission.

[McDewbie]

im new to the BMW world and planning on doing a m50b25 with some worked internals, you mention using the "ZF" transmission, just wondering what car that is out of? is it the trans that comes with the m50? if there is another code for it that would be great aswell

[cmeptb13]

Is there any additional wiring needed to run the e30 brown top coolant sensor? Or is it plug and play?

You will need to splice a corresponding plug into the harness. Judging from the nature of your question you'd be better off contacting Dave from Markert Motorworks and see if he'll cut you a deal on modifying the harness for you. Good luck

[nokincy]

Is there any additional wiring needed to run the e30 brown top coolant sensor? Or is it plug and play?

[kevvve]

SUBD! a lot of good info that a newb like me can use. Thanks OP.

[choleaoum]

What pin is the e30 coolant temp sensor suppose to go to?

[mtlbloodshot]

I got every single line from a 325is so Ill use that cooling line. Just need to order the M52 pressure line.

[cormier]

So basically I just need to get a M52 pressure line. The 21mm should plug onto the pump and 19mm to the top inlet on the rack.. The cooling line is all the same for all E36 models correct? (21mm) which hooks up to the bottom of the rack and the other to the reservoir.

My e30 cooling line worked too