The Subaru SVX World Network   SVX Network Forums
Live Chat!
SVX or Subaru Links
Old Lockers
Photo Post
How-To Documents
Message Archive
SVX Shop Search
IRC users:

Go Back   The Subaru SVX World Network > SVX Main Forums > Technical Q & A

Reply
 
Thread Tools Display Modes
  #1  
Old 02-04-2008, 11:15 AM
b3lha's Avatar
b3lha b3lha is offline
Phil & Belha
 
Join Date: Aug 2001
Location: Alcyone Limited, Buckinghamshire UK
Posts: 2,671
California Mode

I remember reading, a long time ago, that SVXes sold in California were detuned from 230hp to 220hp because of the stricter emissions regulations. I can't find a reference to that anywhere, and the numbers are a bit too rounded to be believable.

However, from looking at the 1992 USDM factory service manual, it does seem that the California model has a different EGR system. If you look at the attachments you can see an "EGR Temperature Sensor (California Only)".

Looking through the ECU program, I can see that it has two modes. Standard mode and California mode. It uses different numbers in some of its calculations depending on what mode it is in. There are so many unknown variables that I can't say what effect these values have on the performance of the engine. It seems possible that the ECU might tradeoff some performance for better emissions.

The ECU decides which mode to use depending on pin 4 of connector B62. If this pin is connected to ground it will run in California mode, otherwise Standard mode. If you have a California SVX, you could maybe reclaim a couple of hp by cutting or adding a switch in this wire.

If anybody wants to experiment with this then I suggest the following experiment:
1) Verify that your car is a california model (does it have an EGR temp sensor?)
2) Unplug the sensor and run the engine, check that you get a CEL code 55.
3) Plug in the sensor, clear the code and check it is clear.
4) Disconnect the wire from pin 4 of connector B62.
5) Repeat step 2. This time you should NOT get CEL code 55.
6) See whether there is any measurable difference in performance.

See attachments.

Phil.
Attached Images
File Type: png cal-1.png (48.2 KB, 121 views)
File Type: png cal-2.png (20.7 KB, 115 views)
File Type: png cal-3.png (59.3 KB, 111 views)
__________________
Subaru ECU and TCU Website
1992 Alcyone SVX Version L
1992 Alcyone SVX Version L
1994 Alcyone SVX S40-II
2004 Subaru Legacy 2.5 SE Sports Tourer
1996 Subaru Legacy 2.2 GX Wagon
1988 Subaru Justy J12 SL-II

Last edited by b3lha; 02-04-2008 at 11:19 AM.
Reply With Quote
  #2  
Old 02-04-2008, 11:19 AM
TomsSVX's Avatar
TomsSVX TomsSVX is offline
Maniac modifier
 
Join Date: Dec 2003
Location: Branchburg, New Jersey
Posts: 15,489
Registered SVX Classic SVX
the EGR temp sensor was included on 1992 california SVXi BUT not the rest of the USDM models. Starting with 93's all of them had the EGR temp sensor... Just a little heads up.

Tom
Reply With Quote
  #3  
Old 02-04-2008, 11:21 AM
b3lha's Avatar
b3lha b3lha is offline
Phil & Belha
 
Join Date: Aug 2001
Location: Alcyone Limited, Buckinghamshire UK
Posts: 2,671
Quote:
Originally Posted by TomsSVX View Post
the EGR temp sensor was included on 1992 california SVXi BUT not the rest of the USDM models. Starting with 93's all of them had the EGR temp sensor... Just a little heads up.

Tom
Wow. That was quick!

I have looked at a 94 ECU and it still has the two modes controlled by the wire on pin 4. I guess basically all the 93 and onwards run in "California" mode, whatever the state.
__________________
Subaru ECU and TCU Website
1992 Alcyone SVX Version L
1992 Alcyone SVX Version L
1994 Alcyone SVX S40-II
2004 Subaru Legacy 2.5 SE Sports Tourer
1996 Subaru Legacy 2.2 GX Wagon
1988 Subaru Justy J12 SL-II
Reply With Quote
  #4  
Old 02-04-2008, 11:23 AM
TomsSVX's Avatar
TomsSVX TomsSVX is offline
Maniac modifier
 
Join Date: Dec 2003
Location: Branchburg, New Jersey
Posts: 15,489
Registered SVX Classic SVX
yes, thats why my 92 doesn't give me any trouble now that I have disabled the EGR.

Tom
Reply With Quote
  #5  
Old 02-04-2008, 11:25 AM
b3lha's Avatar
b3lha b3lha is offline
Phil & Belha
 
Join Date: Aug 2001
Location: Alcyone Limited, Buckinghamshire UK
Posts: 2,671
The Euro/Aussie model only has "Standard" mode.
The JDM version has no EGR at all.
__________________
Subaru ECU and TCU Website
1992 Alcyone SVX Version L
1992 Alcyone SVX Version L
1994 Alcyone SVX S40-II
2004 Subaru Legacy 2.5 SE Sports Tourer
1996 Subaru Legacy 2.2 GX Wagon
1988 Subaru Justy J12 SL-II
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


All times are GMT -6. The time now is 11:39 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
© 2001-2015 SVX World Network
(208)-906-1122