Join Date: Aug 2012
Location: Austin, Texas
Car: 2001 VDC/SC One of a Kind
Feedback Score: 2 reviews
Here's the skinny:
I had this idea to either put a turbo or a supercharger on my car. Mathematics and space, physics and effectiveness all calculated, the supercharger won out.
I found several people in Europe who are modifying H6's in Outbacks, TriBecas and Sedans. All 2004 and up. I swapped emails with a few people and concluded that it was possible to blow this motor. Blow it with more air.
Then I find that the supercharger won't fit properly. The ABS module is in the way on one side, the battery on the other. Move the battery, sure, put it in the rear, but with the blower on the driver side, air plumbing is too tight. So, back to the passenger side as they do in Europe and Australia. Even right hand drive engine compartments are set up identical. So, I'll move the ABS. Designed where and how I will reposition it and move on.
So, I have the engine compartment mapped out and know what I need for the mechanical installation. But a blower is no good unless it is operable.
Programming. Several people, people who are supposed to do upgrades for a living, said I would have to find a suitable piggyback system. There isn't one that is easy. I would have to rewire the car, build harnesses, tuck the piggyback somewhere and hope the solder holds the pins at the connections. That is finite work and tedious. The Subarus use Denso ECM's. They are rewritable. Hey, back up. REFLASH. Idea.
Well, I found someone who does ECM mapping on Subarus. He owns one and has remapped several NA as well as Turbos using the factory ECM, increasing the output and very successful.
I use RomRaider. I ripped the factory ROM and sent it via email to Ed, my mapping guru. We, yes we, connect to the car via Team Viewer over the web and he is looking at data at the same time I am.
Here's the kicker: 2nd gen H6 is MAP sensor driven. There is no MAF, its all calculated from the MAP. Ed is into new territory, working longer on this project than any other, but we have been successful thus far. Knock retard is confusing both of us as it is retarding up to -14 degrees. This evening, I think I figured out why. You see I drive with my laptop connected to the car and watch what the car is doing with varying demands from me. The knock retard is only when I am on an upgrade and the computer is trying to keep the transmission torque converter clutch engaged for fuel economy. It is making up for the load created by the transmission. I never get a "ping" from detonation I always use premium fuel, NGKs are new 15k or so ago, as is the fuel filter. We were even wondering maybe I got crappy fuel out of the station's tank. I don't know, haven't noticed anything different performance wise except when I reflashed the previous 2 times.
Fuel/Ignition map #3 is being written as I write this. Ed is going to increase my top end rpm. No more cutout @ 6300. Going higher! Yeah, baby.
All said, the parts I need for the blower install are on the way from Australia, the 01 WRX injectors are on the way from Denso, the pump for the water cooler setup for the blower is on the way, new knock sensors, just in case, are also on the way and mapping this Denso for 7-10 psi boost is now a reality since we know we can manipulate the programming from stock with gains using stock mechanical setup.