Video; Engine Selection;
The hunt for the engine began, it was going to be difficult as the E46 is an extremely rare car so finding a spare engine was not easy. Also i did not want to attempt a complicated swap like a M3 engine (s54 engine) or much more complicated LS (Chevy v8) or 2JZ (Toyota) engine, which are done commonly in the US/EU.
But i finally found a engine worthy enough to be put in my car & yes it was the 328i engine (6 cyl) codenamed the M52TUB28.
This engine was coming off from a car which had only about 25,000 kms on the odo (compared to the existing 86k in my 318i) which was another advantage.
Fortunately this engine was from a friends E46 coupe & he was willing to let go as he had the vision of an M3 swap for his car.
But there were some challenges, his car was an automatic & mine was the GETRAG 5 speed Manual & i wanted to retain the manual.
So for this job though a bolt on, but at the same time required skill as not many such swaps have been attempted in India. I chose D.A.D workshop
[D.A.D] to get this done.
Day 1 @ D.A.D Workshop: Engines Coming Out;
To get the engine out it was obvious we had to dismantle the front end completely and get the AC condenser, Radiator and other things out of the way.
After the front end was out, getting the engine and transmission out was easy as they are bolted on to the chassis majorly with only 4 bolts.
318i engine out;
Having the car on jack stands is recommended here to ease access.
In the meanwhile we had already removed the bigger engine from the donor car and kept it ready waiting outside.
Engine Coming out of the Donor Car;
Donor Car without the Engine;
Day 2 @ D.A.D. Workshop: 328i Engine going in;
Both the Engines side by side;
On Day 2 the manual transmission of the 318i was bolted on to the new engine and was ready to go into my car.
Before that obviously the engine mounts had to be replaced with the 328 ones.
We required some more parts off the donor car like we had to use the cooling system of that car into mine (as 318i cooling system would not be compatible) & other parts like the sway bars too, all this was quite easily possible as the Donor car was just next to us.
Getting the engine in was fairly easy now and a proper bolt to bolt fitment.
We also needed the engine immobiliser & the key of the donor car as obviously the 318i's key wouldn't work.
Day 3 @ D.A.D Workshop: ECU, Wiring & Custom Exhaust;
Once the engine was in the bay we had to use the ECU & the engine wiring harness from the donor car to make all this work in my car.
This took only a few hours & the same day itself we were able to fire up the engine for the 1st time.
After which a quick service was conducted to set the cycle.
The only thing remaining which was tackled later in the day (night to be precise) was the Exhaust. I wanted a pretty racy sound something like the DTM racecars & with the help of referring to some designs of such existing race setups we were able to make such a exhaust setup which made the car sound really aggressive (Sounds in the video)
^ Need to order new muffler tips though.
Driving Impressions of the Car post the Swap;
I have driven about 500 kms already now & almost use it daily to take it to the gym & so far this build seems just like a factory fit. There are no engine check lights, the ABS is working fine & so is the traction control system.
The gearbox and engine have syncced very well to deliver the power perfectly. And speaking of power the previous engine (318i) was generating aprox 117 HP from its 1.9L engine where as this new 328i (2.8 6 cyl) unit is now generating almost 200 HP which in percentage is about a 75% increase.
Also mind you this car previously only weighed about 1250 kgs, even if we add about 100kgs for the larger engine still we should be about 1350kgs. Still we are about 150 kgs lighter than a comparable modern day BMW say the F30 320d.
This 328i engine is a strong one and pulls cleanly all the way to its 6500 rpm redline and the real beauty is how smooth and progressive it is in its power delivery. Another characteristic is the Variable valve timing which does kick in. Well for people who aren't aware, for example what Honda term its as VTEC or what Toyota term as the VVT-i, BMW had termed this as VANOS. The VANOS does kick in around 4000rpm but isnt brutal like a turbo but has it delivers that extra kick in its own sweet way.
Well to throw in some numbers i did some 0-100 runs & i could manage a sub 7.5 seconds to the 100 time. Which is pretty respectable & im sure this will improve as soon as i change the clutch which is slipping now with this extra power to handle.
Overall i believe its not a mere heart transplant what we did, but a soul transplant as this engine with a manual box is just phenomenal fun & has transformed the car's personality. But still a lot of more work pending, though this was one of the major steps in this project but still is only the beginning.
Special thanks to my friend & BHPian Mod Akshay1234 who helped me with the technicalities during the swap
