The comprehensive DOHC engine swap thread.

[dubseven]

Most people use the 2002 res with that setup.

You can make a stud there to hold it or you can do a M42 rad and eliminate it all together.

Did a 2002 res for the brake booster........ Turned out really clean, love it!

As for coolant, ended up just fabricating an aluminum reservoir..... Mounted in tray behind passenger strut tower. Looks pretty trick ;)

[AndrewK]

I did the majority of my harness wiring tonight (NV M50 into 89 E30) and I hooked up 13 wires. I made my own chart with colors, pin numbers, page numbers on the EMTs and all. I cross referenced this with AKG and matched them up. I was unsure about one thing. Oil Temp pin 19 on car side and X6031 pin 10 on engine side. What are these and how do I wire it?

I think this is only present on Euro engines (engine harness side) and E30 M3 (car side). They have an oil temp gauge in place of the "fun-o-meter" fuel economy meter on your average E30.

[A_Whelan]

I did the majority of my harness wiring tonight (NV M50 into 89 E30) and I hooked up 13 wires. I made my own chart with colors, pin numbers, page numbers on the EMTs and all. I cross referenced this with AKG and matched them up. I was unsure about one thing. Oil Temp pin 19 on car side and X6031 pin 10 on engine side. What are these and how do I wire it?

[Wishno87]

So I have an 86 325ES with an M50. Ix booster, not sure which res, but the install was a total hack. Installing a 2002 res remotely - is there any better solution?

Secondly, I have an 89 coolant res, but there is no mounting stud on the fender. How are you supposed to mount it on early cars with no stud?

Most people use the 2002 res with that setup.

You can make a stud there to hold it or you can do a M42 rad and eliminate it all together.

[dubseven]

Anyone?

[dubseven]

So I have an 86 325ES with an M50. Ix booster, not sure which res, but the install was a total hack. Installing a 2002 res remotely - is there any better solution?

Secondly, I have an 89 coolant res, but there is no mounting stud on the fender. How are you supposed to mount it on early cars with no stud?

[Jalves619]

I dropped mine in with the offset stud facing down and the centered stud going through the engine arm. If you look at some pictures of the green mounts it should give you a better idea.

[NERDE30]

On the REVSHIFT mounts which side bolts up to the car, and which side bolts to the mount arms. They are offset bolt pattern. One of hte bolts are in the middle of the bount,, and the other is off set a bit.Anyone know , trying to finish this swap

[durtyE30]

I can use S50 fly, clutch, pp, throwout bearing and starter, will need g260 pilot bearing and it all bolts directly onto s50 that way.

Found it on e30tech....r3v's slackin here!!

Sent from my DROID2 GLOBAL using Tapatalk

[I*Do*Werke]

Hey guys, Im in the middle of wiring up my auto>5speed 24v swap. On my 91 325is there are 2 connections that go from the interior to the m20 harness through the glovebox. One connection is green/black and the other is black/red, black/violet. Since Im doing an M52 swap, I need to know where these wires would connect to the m50tu harness. I know that the green/black wire is for the automatic neutral safety switch. I do not know what the black/red, black/violet wires are for.

What do I need to splice to what? Please help! Im finally almost done with my swap!

[durtyE30]

Okay, so I'm getting an S50 and Getrag 260 for my E30 soon. I need to pick up a flywheel, clutch, and pressure plate.

What motor should I use the flywheel, clutch, pp, etc. from? S50 or M20 starter?

Basically configure my engine-transmission connection, I'm confused and want to be sure I'm 100% right before I do anything in terms of parts purchases.

[Matt-B]

Anybody know what this connector is for? It's in the engine bay and runs into the fusebox but not to any fuses. Wire colors are blue & brown/red into the box where there is a connector. After the connector it leads straight into the interior. Car is a 85 325e which I have the etm for but I haven't been able to figure it out yet. Thanks in advance.

outside temp sensor, or factory alarm tap?

[Lof8]

Found the draw, fuse 21 - interior lighting. Kinda strange, since none of the dome lights or anything were on. Pulled the fuse, no more draw. But with that fuse pulled and the key on, all of the dome and dash lights come on. Now just need to figure out why that circuit isn't shutting off.

Are you saying that everything functions as normal with the fuse out? I've been dealing with a very similar slow draw since completing my swap. I've been disconnecting the battery to avoid problems during extended parked periods.

[Jand3rson]

IIRC there are two variations of the 944, one is 10mm and other 12mm. either one just needs to be rethreaded

This, but the pushrod on my 944 booster was kind of strange, we just cut it off and welded a bolt with the correct thread pitch to the end of the pushrod. Much easier than cutting new threads.

[pandaboo911]

I'm doing a 94' m50 into my 90' e30 this summer. I have a pretty decent idea of the parts I am going to need. One thing I am struggling with is the brake booster. I know there is extensive discussion on the booster subject, but I'm tired of looking... People use the 320i or 325ix booster with mods to the shafts and whatnot. I read somewhere that you can use a 944 booster. Is that possible? If so what mods need to be done to the shaft?

There is an ATE booster and a Girling booster, make sure to get the ATE