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Discussion Starter #1
Just pulled the motor so I guess it's time for a build thread. Car is a 92 BMW 325i Mtech convertible. It's been my daily driver for 3 years and will continue to serve as such once the swap is done.







The motor is nothing extraordinary. Just an 01 4.8L with a plate kit for good measure. The stock 2.5L inline 6 would be lucky to make 140whp on a good day. Engine management is an MS3 gold box. Oil pan is a modified GTO piece.







I'm using mounts from Garagistic since the intro price of $300 was more attractive than pulling the motor in and out a bunch of times. I immediately thought something was wrong as the mounts did not line up side to side with the holes in the subframe. Turns out they chose to utilize the rearward mounting bosses that are only present on aluminum blocks. So within the first day one was cut up to. The trans crossmember also needed some trimming to sit flush against the body. The holes for the trans mount are also at a spacing that doesn't line up with either the rubber or poly mounts I have. I'll most likely just punch a single center hole in and use that.









Im fucking done with T56s so the trans is a TH400 that I hope to source another gear vendors overdrive one day, as I really like the one in my M3. I'll be swapping to 2.79 gears to make highway driving livable with the 24" tall tires on the car. Fitting the trans took some massaging with a 10lb sledge but it'll go.



That's about all for now. I've got some fairly minor rust repair to take care of before dropping the motor in. Luckily this panel is still available new from BMW for $90.

 

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Very cool. I've been wanting to do this to a E36 or a E46 coupe
 

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Discussion Starter #3
Got some more basics done today. Removed the brake booster and installed a 944 master cylinder with a plate from Massive Brakes. Removed the ABS pump and trimmed/reflared the existing lines. Also installed a vette fuel filter/regulator.



Started scrubbing 25 years of grime and whatever the yellow shit is that BMW liberally applied to the engine bay. Still got a ways to go before it's ready to start dropping the motor in.



 

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Discussion Starter #5
Got it clean enough for the intent and purpose of the car. I can always touch it up a bit more later. Next up is drilling out the spot welds for the rusty battery tray...or whats left of it and put some new sheetmetal on order. Going to apply some phosphoric acid on the few spots that have surface rust to neutralize it, then treat it with POR15. Since those spots are low and out of sight, Ill just hit it with some Duplicolor Arctic White, since its a close enough match for Alpine white. Then its time to drop the motor in.



 

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You most already know but i think the abs unit shares a ground with the lights on the e30 chassis . I remember having a front light problems on mine when i toke out the abs but it's been 10 years , i could be wrong.
Great work as always.
 

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Looks good man.
 

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Discussion Starter #9
You most already know but i think the abs unit shares a ground with the lights on the e30 chassis . I remember having a front light problems on mine when i toke out the abs but it's been 10 years , i could be wrong.
Great work as always.
I know they use the same grounding stud for sure. Ill probably just leave the ABS wiring intact and tuck it away to prevent any surprises. The last time I removed an ABS pump from one of these was 2004 so I'm a bit foggy as well. Ive had enough headlight issues as it is. The car was mostly unmolested, however, a previous owner did a shitty job of installing HID lights and use the "Im going to cut every wire near the headlights and see if this works" method of wiring. Ive got a bunch of butt connectors with corroded wire that I need to replace :mad:

On the bright side I got the old rusty battery tray out and a small hole patched up. Hopefully some POR15 tomorrow and I can drop the motor in while it dries.

 

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Discussion Starter #10
Dropped the motor in. I'm gong to need to shim the mounts a bit to make the modified GTO pan work. While the mounts have two position "options", there's really only one. The further back choice and even that seems like it could go rearward a bit more. Modified ebay header cleared the steering shaft so that's a positive. Going to cut about a 1/4" off the water pump about for additional radiator clearance. I'll probably get the trans bolted up before attempting any more mock up.







 

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Discussion Starter #14
Looks good. Do you know the weight difference between the m20b25 and the lr4?
Not sure yet. Car will go on the scale right after I'm done. It was a porky 3,020 before. I still need to put 150lbs of th400 in the car but the front end isn't hurting under the weight of the motor. The trans better drop it back down 1".

 

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Really cool build!

My brother is really into BMWs, and he's been toying with the idea of picking up an E30 to mess around with. He really wants to build an Alpina clone. I'm trying to convince him to let me drop a 6.0 in it when we build it.
 

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Discussion Starter #16
On a positive note the transmission fits with room to spare after drilling a center mount hole and trimming some extra material to get it to sit flush against the floor.



I'm just going to make my own motor mounts now that its positioned in the car. I'm sure they work with the canton pan but I prefer the cast OE pans with the integrated filter mount. I'll probably be selling the motor mounts themselves shortly if anyone wants em. Im thinking $150?

 

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Discussion Starter #17
Much happier with this fitment....

Motor is 1.25" further back than it was before. Just waiting on some 1/4" laser cut mount plates to finish them off. Didnt have enough scrap material to make my own today.









 

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Discussion Starter #19
Installed the B&M Quicksilver shifter today. Had to make a recessed housing in order to get it low enough to clear the stock console but it worked out well.









 

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Discussion Starter #20
My old exhaust happens to fit as well, so all it needs is a y-pipe to the headers. With making my own mounts, the block hugger header will fit on the passenger side so Ill have a total investment of $150 into the headers. Need to order a shift kit and deep pan for the trans to get that all squared away.

 
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