Guess I should make an update. The diesel M46 is working just as sweet as the day I installed it. I guess having one that isn't totally worn out makes a big difference.
I'll make this update about the Megasquirt. I got pretty fed up with the 007s failing, with the last one snapping the wire at WOT. I had my laptop with me so I converted to speed density on the side of the road and I've been figuring out how to tune that ever since.
So after some tuning and learning I realized that I really didn't like the Megasquirt adapter harness that I made last year. I knew what mistakes I had made, so instead of trying to patch it I just scrapped it and made a new one that connected to both the ECU and EZK plugs. While I was at it I added some fun things like a clutch switch and an EBC. I wired up the TPS connector too but I still haven't bothered to buy the adapter. Gotta do that sometime. My main reason for installing the EBC was so I could adjust boost without opening the hood, but it had the side benefit of getting rid of the boost dropoff I had with the MBC. The new harness, with proper grounding scheme, doesn't have anymore interference stuff going on. Now my coolant temp doesn't rise and fall with RPM. The biggest thing is that I just feel better about it since there's no exposed stuff. While I was at it I replaced the 8 pole firewall connector with a Deutsch connector. I put in a new sending unit as well, the pump power wire was so corroded there's no way the pump was running consistently. At one point the car wouldn't start until I popped the trunk and slammed my fist over the fuel pump cover.
Now, the clutch switch is a very fun feature. Unfortunately, while I was having fun with it, the Thrush muffler exploded a little bit. It seriously felt like a shotgun went off in the trunk. It even dented the trunk floor up. Turns out the Thrush was a pretty good restriction, the car spooled way faster without it.
Anyway, not too long after the switch to speed density I got the car on a proper hub dyno. Made a highly impressive 229whp and 236ft lb. That was with a thumb-size rip in the hose directly above the turbo, so it was only able to spool up to 19psi. The gentleman who dyno'd my car gave me a lot of help with my tune, in terms of idle and startup. Turns out if you switch from MAF to MAP you're gonna have to change your startup enrichment and warmup stuff. The other big thing was that I absolutely couldn't figure out why the car would only idle smoothly if the wideband was showing about 11:1 or richer. Well, the dyno wideband tailpipe sniffer showed that my AEM was reading a tad rich, so at full throttle with the gauge showing around 12.0 it was actually running more like 13.0. After that I added a significant amount of fuel to my whole VE map and the car ran a lot smoother. We played with the timing a little, but it seemed my street tuned (guesstimated) timing map was already pretty good.
So after that I dove back into the dashboard and installed a Spartan 2 wideband controller in place of the AEM. I never really liked having the flashy blinky gauge in my dash anyway, so now I just don't have a WB gauge. If I wanna see my AFR I can just plug my phone into the ECU. The other thing I did was replace the original LH2.2 coil with a Blaster since I was getting spark blowout with higher boost. Since then I've been trying to hone in my tune. I feel like it's pretty good, but there's always something that can be improved. I'll probably get it back on the same dyno in the future and maaaaybe I'll crack 300. Probably not though.
