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Old 02-11-2004, 10:33 PM   #1
Kevin Thomas
Street Racing Instructor
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Join Date: Jul 1999
Location: 1997 OBS, 1996 SVX, 1988 RX
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1989 1989 XT6

Post Stock ECUs Dyno Shootout Results

Car: 1997 2.2ltr Subaru Impreza Outback Sport Wagon (AWD/Autotranny)

Dyno: Dynojet *AWD Dyno*
Place: Xotic Motorsports
Current Mods: Underdrive Pulley and 2.25" axle back exhaust (Remus-dual) That's it!

Tests: Tested 3 different ECUs for my car. Did 6 dyno pulls total. The first 3 were 3rd gear pulls up to around 6000rpm. ECUs where changed and reset (Pocketlogger) after each run. The 2nd 3 dyno pulls where from 1st gear all the way up to the top of 3rd gear at 6000rpm. This way you could see the hp/torque and even shift characteristics of each ECU to compare.

ECUs Tested:

Part#AC831 This the ECU that comes stock in my car according to the vin number (lost my original ECU, don't ask).

Part# AD61A This is a 1999 2.5ltr Legacy GT ECU. I used this while I was running turbo/nitrous for years. Just took it off the car last month.

Part# AD400 This is a 1997 2.2ltr Impreza ECU. It's not for my car but other models of Impreza in 1997.


The first 3 runs where done in 3rd gear starting between 65mph-60mph. It's really difficult to get a decent run in this gear without having the tranny downshift into 2nd gear. Sudden mashing of the throttle even this high can make the tranny downshift even if it has only 200rpm left to go before shifting into 3rd.

3rd Gear Run



Note my stock ECU makes less horsepower than the Legacy and the other 2.2ltr ECU. My stock ECU also seems to run richer than the rest. I tested my stock ECU first, the 'other' 2.2ltr Impreza 2nd and the Legacy ECU 3rd. I didn't let the car cool down for no more than 5 minutes in between each run.

If someone can make these files smaller for me, please let me know. I'll delete what I have up and submit a smaller size. I'm not good at these things.

Next up: 1st to 3rd gear run of each ECU.----------------->
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Last edited by Kevin Thomas; 07-12-2004 at 01:06 PM.
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Old 02-11-2004, 10:44 PM   #2
Kevin Thomas
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Join Date: Jul 1999
Location: 1997 OBS, 1996 SVX, 1988 RX
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1989 1989 XT6

Default Full Runs

This file is the 1st-3rd run of all the ECUs.

Remember:
Part# AC831 is my stock ECU,

Part# AD400 is a 1999 2.5ltr Legacy GT ECU and

Part# AD61A is the 'other' 1997 2.2ltr Impreza ECU for other models made in 1997.

1st-3rd gear run

Just for further analysis, I'll post up each gear of all these runs, hp/torque and air/fuel ratio and leave it at that.

I know there are a ton of things (like the size of the pics) that could be done better dyno wise but this is my 2nd time on the dyno. I'm not rich so I plan to spend as little time there as possible with each dyno session BUT I feel like I'm on Dyno-Crack now. I have to be there as much as possible. I've already made more appointments to test out little stuff.

Before posting the dyno charts of each gear, notice the hp/torque spikes in each gear. This is the valve body shifting pretty hard (just the way I like it). I tried to describe the feeling to folks as 'it-throws-the-car-forward while shifting. At least the full dyno run in to 3rd gear shows why. Torque shoots up in between gears. Pretty cool eh?

1st Gear of Full Run

2nd Gear of Full Run

3rd Gear of Full Run

Looks like the Legacy ECU makes the most power, then the 'other' 1997 2.2ltr ECU, then my stock Ecu. The air/fuel ratio looks interesting. The Legacy is LEAN. Can't see how I got away using that ECU doing what I did. I'll stop here.

Comments!?!

Last edited by Kevin Thomas; 07-09-2009 at 03:43 AM.
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Old 02-12-2004, 02:07 AM   #3
DrBoy01
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Awesome testing. I'm sure any 2.2ltr enthusiasts will appreciate your hard work!
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Old 02-12-2004, 06:25 AM   #4
NotAnRS
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Subaru Stars

Interesting stuff. Keep it coming.
Can the '97 up ECUs be swapped with the '96 and older cars?
Would be nice to see how a 2.5RS brain compares or if it's the same as the Legacy one.
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Old 02-14-2004, 06:20 PM   #5
wac
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Default Re: Full Runs

Quote:
Originally posted by Kevin Thomas
Looks like the Legacy ECU makes the most power, then the 'other' 1997 2.2ltr ECU, then my stock Ecu. The air/fuel ratio looks interesting. The Legacy is LEAN. Can't see how I got away using that ECU doing what I did. I'll stop here.

Comments!?!
That's pretty cool. I'm quite impressed that you were able to get almost 100 whp on one run in 2nd gear, but it you were fairly consistent in getting almost 95 whp even in 3rd gear. I am assuming that these were done in FWD mode?

The AD400 ECU is apparently for the California emissions model. I don't think the PocketLogger reset was necessary, since swapping ECU's will pretty much guarantee that they were reset.

Your AFR's may look a little scary, but I'm sure the ECU is dialing back timing where necessary. If you're using good pump gas, it may not need to dial back much timing.

I reduced the files down to about 10% by saving them in GIF format and reducing the picture size in half:
3rd Gear Run
1st-3rd gear run
1st Gear of Full Run
2nd Gear of Full Run
3rd Gear of Full Run

Good luck,

-WaC
Wayne

Edit: changed dyno plots to half size.

Last edited by wac; 02-15-2004 at 08:29 AM.
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Old 02-14-2004, 07:43 PM   #6
Kevin Thomas
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1989 1989 XT6

Default Re: Re: Full Runs

Quote:
Originally posted by wac
That's pretty cool. I'm quite impressed that you were able to get almost 100 whp on one run in 2nd gear, but it you were fairly consistent in getting almost 95 whp even in 3rd gear. I am assuming that these were done in FWD mode?
Nah! Xotic Motorsports has an AWD dyno so it was done in AWD mode.

Thanks for the resizing of the files. I was wanting them resized so I can post the pics of the files directly in this post without them widening the 'thread-size'. This was for the lazy folks who didn't want to click a link to see the dyno runs. Testing it out though, it still makes the screen widen so you have to scroll to the right to read and see the rest of the image/post.
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Old 02-14-2004, 11:24 PM   #7
wac
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2005 Outback 2.5 XT
Champagne Gold Opal

Default Re: Re: Re: Full Runs

Quote:
Originally posted by Kevin Thomas
Nah! Xotic Motorsports has an AWD dyno so it was done in AWD mode.

Thanks for the resizing of the files. I was wanting them resized so I can post the pics of the files directly in this post without them widening the 'thread-size'. This was for the lazy folks who didn't want to click a link to see the dyno runs. Testing it out though, it still makes the screen widen so you have to scroll to the right to read and see the rest of the image/post.
I don't know what the proper offset is between a Dyno Dynamics (which I have come to accept to be more accurate) and a Dynojet, but some people have reported numbers that indicate about 15%. Therefore, your 98 whp and 93 whp numbers would work out to about 85 whp and 81 whp on a Dyno Dynamics. This is more like what I'd expect from your current configuration, and agrees well with the typical intake/exhaust N/A 2.5RS that pulls about 100 whp on a Dyno Dynamics.

I reduced one of the pictures in half, but it's not as readable:
Half size version

-WaC
Wayne
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Old 02-15-2004, 03:17 AM   #8
Patrick Olsen
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WaC!!! You're alive!!! Long time no, uhhhhh, type. Drop me a line and let me know what's goin' on, my brothah!

Pat Olsen
'97 Legacy 2.5GT sedan
Why, no, now that you mention it I really don't have anything to contribute to this thread...
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Old 02-15-2004, 06:33 AM   #9
Kevin Thomas
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Join Date: Jul 1999
Location: 1997 OBS, 1996 SVX, 1988 RX
Vehicle:
1989 1989 XT6

Default Re: Re: Re: Re: Full Runs

Quote:
Originally posted by wac

I reduced one of the pictures in half, but it's not as readable:
Half size version

-WaC
Wayne
Testing!



Yeah, that'a work! I need to build my skillz at this stuff! I re -edited my first post. Thanks Wayne!

'Sup Pat?!?
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Old 02-15-2004, 08:27 AM   #10
wac
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Member#: 689
Join Date: Dec 1999
Chapter/Region: NESIC
Location: Lebanon, NH, USA
Vehicle:
2005 Outback 2.5 XT
Champagne Gold Opal

Default Re: Re: Re: Re: Re: Full Runs

Quote:
Originally posted by Kevin Thomas
Yeah, that'a work! I need to build my skillz at this stuff! I re -edited my first post. Thanks Wayne!

'Sup Pat?!?
Hi Kevin,

I've replaced the original GIF images above with the half size versions.

Hi Pat! I saved a copy of your Legacy GT DOHC dyno runs on a Dyno Dynamics, where you got 114.3 whp with the MRT exhaust and 100.5 whp with the stock exhaust. Do you have any other dyno data for your car?

-WaC
Wayne
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Old 02-15-2004, 02:58 PM   #11
Patrick Olsen
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Sure, I'll send some stuff your way. Unfortunately the one dyno run I don't have, since the computer hiccuped, was the ~143hp run that I made with all the mods. But I have a few others that show the gradual build-up.

Pat
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