Welcome to the North American Subaru Impreza Owners Club Wednesday December 17, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo)

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 07-13-2004, 05:05 AM   #1
adg016
Scooby Newbie
 
Member#: 45645
Join Date: Oct 2003
Location: S. California
Vehicle:
2004 WRX
WR Blue

Default Dyno Results and Implications on CA 2004 WRX ECU Programming

Ok guys,

I have a feeling this is going to be a catalyst for a bunch of discussion about WRX ECUs and learned/unlearned/Vishnu reset behavior. Before I start, please note my car is BONE stock. The only thing that could help its numbers would be 12-lb SSR wheels and a very ginger break-in period that lasted close to 2K miles.

I went to Harman today, and did 5 runs. I want you all to pay close attention to the blue versus the red run. The blue run is how I drove it in, with whatever learned data the ECU had in it since the last reset, say 500 miles worth. The red run represents an ECU reset, whereby I disconnected the negative battery cable, purged the remaining electrons through tapping the brake pedal, and then waited for 10 minutes, just to be on the safe side.

POINTS OF INTEREST:

1. I gained 13 whp with an ECU reset proving that a knock event or some other data point can "stick" the ECU in a severely retarded timing mode.
2. I made more whp than another other bone stock WRX on this particular dyno.
3. Check out the differences in the A/F ratio between the blue and the red. It's huge! Look how lean it stays in the red versus the blue.
4. Subaru is running these cars WAY lean when they're putting out the power they're supposed to. If you multiply 186 by 1.22, you get 227 horsepower, right where it should be.
5. The reality of the situation is that I believe most or much of the time none of us using CA gas are actually getting full power out of our cars. In fact, we're actually being cheated, due to safety precautions the ECU is taking.
6. The ECU doesn't seem to rebound quickly after a KE to bring our timing back. In essence, it gets stuck, and nothing but a hard reset seems to help it get back to where it should be.

CONCLUSIONS:

1. Resetting your ECU if you feel that your car is sluggish has good odds of remedying the situation.
2. Subaru is running the cars too close to the knock threshold for CA 91 octane gas.
3. The ECUs, once they encounter knock, don't return timing advance the way they should.
4. Tuners such as Cobb, Vishnu, and others will all have problems with ideal maps until SOA implements some new ECU programming.
5. Perhaps both my learned and reset runs are a few hp higher than normal due to my break in and my lightweight wheels, but that can be argued.
6. Our cars should have consistent performance running 91 octane CA gas, and we need to be vigilant about this. There's no excuse for pinging in a stock car.

Now for the DYNO GRAPH!

http://gallery.aboutgardner.com/gal...07_12_04?full=1
* Registered users of the site do not see these ads.
adg016 is offline   Reply With Quote
Old 07-13-2004, 04:46 PM   #2
armand1
Scooby Guru
 
Member#: 10309
Join Date: Sep 2001
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
'02 OBS 2-tone!
'95 Montego Miata

Default

Whups! Looks like you meant to post this to the "Engine Management & Tuning" Forum -- mods?
armand1 is offline   Reply With Quote
Old 07-13-2004, 08:46 PM   #3
bknblk
Scooby Newbie
 
Member#: 30055
Join Date: Nov 2002
Location: Wichita KS
Vehicle:
2004 Jeep Rubicon
BackinBlack

Default

nogoodlinky

could be a SOA problem
bknblk is offline   Reply With Quote
Old 07-14-2004, 12:15 AM   #4
adg016
Scooby Newbie
 
Member#: 45645
Join Date: Oct 2003
Location: S. California
Vehicle:
2004 WRX
WR Blue

Default

adg016 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
DRL and HID on a 2004 WRX bluestone Electrical & Lighting 15 04-04-2008 05:09 PM
Can a 2003 utec be upgraded and put on a 2004 wrx? disque71 Engine Management & Tuning 1 09-25-2005 11:55 PM
Latest dyno results and dyno video. 536 hp / 470 tq STEALTH-WRX Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 42 10-25-2004 01:54 PM
STOCK Dyno Results and 2004 ECU Implications adg016 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 109 07-20-2004 03:43 PM
Injen Posted dyno results for their CAI run on a 2004 WRX trustWRX Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 73 01-24-2004 06:07 AM


All times are GMT -4. The time now is 11:10 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.