Sleeper vdc - Subaru Outback - Subaru Outback Forums
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post #1 of 673 (permalink) Old 09-04-2012, 01:00 AM Thread Starter
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Sleeper vdc

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.
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post #2 of 673 (permalink) Old 09-04-2012, 01:05 AM Thread Starter
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And here is the car. I will put up pics of the interior tomorrow. Tim in Australia can't believe I am doing this on this generation and wanted to see pics anyway.

The last picture shows the placement of the ABS and P/S reservoir which will move as the supercharger will sit above this area. The intake tube for the air filter will go through the fender at the existing port for the resonator with the filter sitting inside the fender. I will have to remove the inner fender to clean the filter, but with the gains I plan on getting out of the car, who cares.
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post #3 of 673 (permalink) Old 09-04-2012, 10:11 AM
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Wow can not wait to hear how quick it is. Please keep us posted.

2001 Outback H6 LL Bean
1995 2.2 Auto Legacy LS Sedan
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post #4 of 673 (permalink) Old 09-04-2012, 11:05 AM
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Have you considered an STS rear-mounted turbo? I have a friend with a C5 vette wearing a pair of them, I can assure you there is no appreciable turbo lag unlike what the naysayers may tell you.

Squires Turbo Systems - Turbocharged Innovation!

Aside from having to plumb intake air from the back of the car they're a relatively easy install.

One thing I'd be very interested in is if you guys can tweak the ECU to ignore the AT. . . it would make swapping in a MT a much easier feat. Right now the only successful jobs I've seen involve leaving the AT trans controller in place and install resistors in place of solenoids.

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I seem to get a lot of "will xx fit in my car?" emails. . . I'm not the authority on everything Subaru, so I very well may tell you the wrong answer as there's nobody else to check me. Please search or ask via the forums first. . .when I answer you via email, it never gets posted and nobody else can confirm or refute my answer.
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post #5 of 673 (permalink) Old 09-04-2012, 11:14 AM
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is the blower like the one in the mini cooper S?

FMIC with cooling spray or ???


sounds like a fun project!


supercharged SVX;



from Tokyo show?;



Perrin (one-off I'm guessing);


Cobb one-off;

Time Flies Like an Arrow,
Fruit Flies Like a Banana!
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post #6 of 673 (permalink) Old 09-05-2012, 12:14 AM Thread Starter
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I thought about the turbos fitted downstream, but the plumbing was the major issue. The supercharger I'm installing is the Raptor VLLC, water cooled. No intercooler, won't need it as the water cooling will keep the bearing surface cool as well as the SC casing and the distance to the throttle is short. Clutched drive for more boost and a 32mm blowoff. The injectors are 410cc.

I would attach a 2nd gear pull I did this evening after installing the 3rd remap but the attachment manager won't upload .csv files. RPM cutoff was increased above 7k and 100% load was achieved just over 6500. The engine gained smoothly and without a hickup.

Another thing I want to mention: I filled up my tank after installing the 2nd version for a weighted pull. I filled up again tonight after work and after running 280 miles since the previous fill up, my fuel economy jumped to 27.5 mpg. This with a lot of logging for gear pulls, full throttle take offs to 100 mph, dogging the hel l out out of it and my regular driving. Can't wait to see what it may do with normal everyday after all is said and done.

Also, pics of the car in and out. And no, the amp does not get heated enough to shut down, especially since my AC is like an ice box. The engine cover is off because I had to remove the MAP to induce boost pressure to get voltage readings and I haven't put it back on yet. Long day.
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post #7 of 673 (permalink) Old 09-05-2012, 01:00 AM
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oh yeah, I ran across that Raptor site - is your car in the gallery there yet?

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post #8 of 673 (permalink) Old 09-05-2012, 05:11 PM Thread Starter
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Sent Tim some pics, but I haven't received the parts yet. All the programming being done is stock setup with tweeks.
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post #9 of 673 (permalink) Old 09-05-2012, 08:37 PM
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here is a link that might be helpfull to your cause
Subaru Legacy International • View topic - My supercharger build: Update 7/5/2010 Emanage!

supercharger is the way to go, interested to see what you will do for engine management.
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post #10 of 673 (permalink) Old 09-05-2012, 11:57 PM Thread Starter
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Thanks. That one is MAF driven. I am having to deal with MAP only on this one. So far, the ECM is cooperating with the changes we are making over stock on stock engine. I was really surprised with the MPG difference, but anytime you add HP, the fuel economy changes for the better.

Also, this guy: My M62 Supercharger Build & DIY-How To - Subaru Impreza GC8 & RS Forum & Community: RS25.com used a blower off a Mercedes. Great outcome. Took him a long time though, but as he said, he had time. I like what he did with the throttle body, doing away with the blowoff valve.
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