As some of you know, the weekend that Jeff and I spent in Calabogie a few weeks back was incredible and a great way to start the season. Unfortunately for me, I destroyed my tires sooner than I had thought, but on the other hand, it allowed me to go out a purchase some new rubber and new rims that will be arriving hopefully by the end of next week. Lets just say for now that they are going to be bigger than what I’m using now, so some modifications to the car will be required.
First off, the wider rubber is going to require the use of spacers in the front to clear the shocks. Next, to get the rears to fit, fender rolling as well as more-than-stock camber will be necessary. So my checkbook came out once more and I purchased some adjustable rear control arms from Bimmerworld and some used spacers for the front (I got a set of 10mm and 15mm and will return the ones I don’t need). Because of the spacers, I also had to get something longer to bolt my wheels to the hub, and I opted to buy some extended studs and nuts and converted the BMW to this system instead of the original bolt system.
Now if I add too much camber in the rear without changing the front, then my car will lose its neutrality and will have a tendency to understeer. Because I had just spent a lot of money, I didn’t want to spend more on camber plates just yet, so I opted for shimming the front hubs where they bolt to the shock. I did a bit of reserach and it seems that you can add up to about 5mm of shims to the two bottom bolts safely, and that will add about -2 degrees of camber to the front wheels. This would give me about -3 degrees total! The only issue is that the top of the wheel is now even closer to hitting the shock so a larger spacer may be required. Unfortunately I won’t be able to tell which size spacer will be required until the new rims come in, but for now, the stock wheels fit with no spacers.
Installing the studs was pretty easy – an allen key and some locktite and they were all set to go! Next – rolling the fenders! With the help of one of Jeff’s friends from the Ottawa Mazda Club, we rented a fender roller. Using a heat gun to make the paint more maleable, we were able to roll the rear fenders fairly easily. When we tried to do the fronts though, we saw right away that there was not as much support on those and it couldn’t be done with that tool. So we switched to a more caveman approach and used a hammer and pliers. A few minutes later and voila! All the fenders were rolled.
After that, we tackled the rear control arms. In theory, there was two bolts holding them on and all we need to do is take them out and replace the arms. In practice – wrong! The bolt that holds the arm into the subframe is blocked by the differential, so it wouldn’t come out all the way. To remove the diff, we would first have to:
-remove the muffler
-remove the swaybar
-disconnect the axles from the diff (12 torx bolts!)
-disconnect the driveshaft
We really didn’t feel like doing all that. After looking at it a bit more, we realized that if we were just able to move the diff back a bit, we should be able to get the bolts out. With the help of Jeff’s friends, we disconnected the driveshaft and took off the swaybar and then unbolted the diff. They moved it back and held it up while Jeff and I quickly removed the two bolts and installed the new arms before putting them back in. All in all, it wasn’t too bad. Once the diff was back in and torqued down, the driveshaft was reconnected and the swaybar was put back on. Everything was torqued down, and the day was over!
It was a productive and fun day! Now all that’s left is to get the rims, have them mounted and balanced and then get the car realigned. More pictures are in the build journal, and keep your eyes open early next week for an update on the wheels & tires.
Shawn
Tuesday April 20:
Thursday April 22:
a 3ft braided stainless steel hose that allows the sender to be remotely mounted near the strut tower away from the vibrations. I installed the ODB using a banjo bolt in the OEM oil pressure sender port. Once all the hardware was in, it was time for the electrical. Using leftover wire from the SPAL fan, I wired everything up and ran all the signal wire through the firewall into the cockpit. After that – the dash panel. I had originally started making a wood/fiberglass panel but quickly gave up on that. Since I had to buy some metal for the firewall block off plate anyway, I bought a little extra to make the dash panel. I used an 80gauge piece of aluminum and cut and bent it into shape. Using a hole saw, the holes for the gauges were cut. Since I was on a roll, I decided to finish my night by installing the firewall block off plate as well.
Tuesday April 27:
Wednesday night I tackled the cooling system. My goal was to bypass the heater core so that it could be removed. First I had to take the intake manifold off the car. This involved disconnecting the fuel rail, the MAF, throttle body, and various electrical plugs and vacuum hoses. Once the manifold was out, I could access the coolant lines that ran into the firewall. I then disconnected all the lines and removed the heater core valve. i was then left with two hoses – one leading from the back of the engine to the valve, and the other leading from back of the thermostat to the valve. You would think to just connect the two and be done with it, but it that configuration, it would allow hot coolant to recirculate through the engine without first going through the rad. That’s why bimmerworld makes an aluminium block off plate with a gasket to plug the hole on the engine. The other hose was terminated using a steel plug and cap from Home Depot – I was hoping to find a brass plug, but they didn’t have one so I had to be a bit more creative. Seemed to have worked! Once the coolant lines were all set, I reinstalled the intake and went inside the car to attempt to remove the heater core. After removing the cluster and dash, several bolts and lots of broken plastic later, the core was out! All that is left to complete the project is to install some sheetmetal to plug the hole in the firewall and a bit of silicone to keep the water out! Another successful night, and one step closer to being ready for the spring!
Saturday I wasn’t able to work until the evening because I was writting my Professional Engineering exam. Once that was over, it was time to get my hands dirty! I started wiring up the electric fan. Following the instructions and a DIY on bimmerforums, I completed the wiring (successfully I hope). I haven’t tested it yet as the cooling system is still empty, but hopefully it will work. I also started working on a dash panel to close up the hole where my radio and vents were. I also heard some bad news from UUC this weekend – their subframe bushings were backordered so I cancelled my order and purchased the Powerflex race bushings from Bimmerworld. I also purchased some Autometer gauges from Summit Racing: oil temperature and pressure, and coolant temperature.
I started off my day on sunday with some welding. I had received my swaybar reinforcement tabs so I proceeded to weld them onto the subframe and repaint. Once that was complete, I worked on reinstalling my cooling system. I strapped the electric fan to the radiator, and dropped it back in the car. I also had my new gasket for the thermostat cover so I put my 80degC thermostat in as well. One more check off the list. I then installed some creative ducting: using an old crazycarpet, I fabricated a duct from the front bumper into the rad to hopefully improve my cooling efficiency :).
Last night I started replumbing my front brake lines. I had purchased a braided stainless steel flex line kit from UUC, and I decided to redo all my hard lines as well since there is significant corrosion in the rear.
replacing the subframe and differential bushings.
The x-brace is designed to connect the front subframe to the frame of the car in order to improve steering response and handling. It’s a BMW part that comes stock on all convertible 3-series BMWs as well as the M3. I had tried to install the x-brace during the transmission swap, however two of the “nutserts” (female inserts that must be pressed into the subframe to bolt the x-brace to) were not installed properly and let go during that attempt. So I picked up a few more, and pressed them back in. One of the reasons they let go is when I was bolting the x-brace on, I had started cross-threading them. This was because on of the holes did not line up perfectly. A bit of drilling correct that issue, and the installation was complete.
Next was the valve cover gasket. One of the tell-tale signs of a leaking valve cover gasket is if there is oil in the spark plug holes. Since pulling the plugs brings you about half-way to replacing the gasket, I decided to purchase one just in case. Also, I had noticed that there was some oil residue around the cover in certain areas, so I figured it would be a good idea to replace it. Two or three yeras ago, I would have been scared to try opening up the engine, but with the experience I got during the FSAE project in university, I feel much more confident tackling these types of jobs. Sure enough, the cover came off with ease. All that is really involved (once the coils and the wiring harness is removed) is to take off all the bolts, and lightly tap the cover to break the seal. Once the cover was off, I cleaned the mating surface and installed the new gaskets. BMW recommends putting some gasket maker in certain leak-prone areas (around the front joints and the rear of the cover), so that was done as well before reinstalling the cover. All done!
After the engine work was complete, I worked on installing my new midpipe. In the last work session, I had cut up my old midpipe in order to remove the catalytic converters and resonators to run a straight pipe into the rear muffler. Before I had a chance to complete that, one of my fellow MCO members, Arek, from 8-Legs Racing, informed me that he already had one built. I quickly went over and picked it up. Unfortunately, the flanges to bolt it onto the headers had been cut off, so I had to do some clamping and welding work to install it. I haven’t reinstalled the rear muffler yet since the hardware was completely rusted and I’m waiting for new hangers to come in.
and already picked up a used transmission from a local scrap yard as the synchros were starting to go on it anways. This was just another excuse to get it done! Since it was going to opened up anyways and my clutch had overheated a few times, I decided to invest in a new clutch and flywheel. 
The original flywheel was a twin-mass and weighed 25lbs. I opted for a single mass stage 2 aluminium flywheel from UUC Motorwerks that weighed in at 8.5 lbs! With that, I purchased a E34 M5 clutch with a performance organic disk (slightly more grabbing power than the stock M5 disk). Since the transmission would be out, I also figured it would be a good time to replace the shifter with a short shifter. After doing some research, I opted to go with UUC again, and I purchased their EVO3 system with the double shear selector rod (DSSR). To rould it all off, I figured it would be a good time to replace the
engine and transmission mounts, and UUC was my source again: I purchased their red polyurethane race mounts. Finally, I planned on changing the differential and transmission fluid with royal purple synthetic fluids.
Next were the clutch and flywheel! We started unbolting the clutch from the flywheel and we were able to get them all except for one that stripped. After some prying, we separated the pressure plate from the flywheel and we were able to spin it around to get access to the flywheel bolts. Those were removed, and the assembly came off. At this point, we noticed that the rear crankshaft seal was leaking. It wasn’t too bad, but this was the time to replace it if we were going to. This means we wouldn’t finish that day, but at least we’d be doing it right. Instead of calling it a day right away, we decided to tackle the engine mounts. It was a bit precarious to install these as we had to tilt the engine to the side so that it was only being supported by one mount, but we were able to do it with no issues.
assembly went very well and we had less issues than we though with accessing the bolts (especially the starter bolts). After the new tranmsision & mounts were installed, the shorter shifter came next, and then the driveshaft.