Welcome to the North American Subaru Impreza Owners Club Monday March 18, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Engine Management & Tuning > Open Source Reflashes

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.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 04-11-2013, 12:17 AM   #1
brokenboy
Scooby Newbie
 
Member#: 225423
Join Date: Oct 2009
Default New ID850 injectors, uneven trims

I put ID850 injectors in my 2008 STi.

Before this, my trims were all zero, and under boost the target fueling was dead on with a wideband. So I'm pretty sure my MAF tuning is good.

Now with the ID850's, I can't get both the trims and the open loop to line up.

ID publishes the latentices for the injectors. If I put these in, I need a flow scaling of ~800cc/min to get nice even 0% trims. However, then under boost it runs about 10% rich. I'm only boosting the wastegate pressure of 13PSI for my turbo right now.

If I put in 885cc/min, which is what the injectors are rated at, I get perfect AFR's under boost, but my cruise trims are off up to 10% (the ECU is adding fuel under cruise).

The weird thing is that the trims add more fuel as my MAP goes to less vacuum, so I'd think a vacuum leak would need more fuel added at idle, not at near 0 vacuum. This could just be the latentcy being of a touch though.

I've checked for a vacuum leak, but I can check again..

Is there anything but a leak that could cause this issue? Am I missing anything but injector scaling and latentcies?
brokenboy is offline   Reply With Quote
Old 04-11-2013, 07:59 AM   #2
Bamofo
Scooby Specialist
 
Member#: 159743
Join Date: Sep 2007
Location: Plymouth Ma
Vehicle:
07 STI Limited
TurboMike Tuned 2.35

Default

The problem is your thinking about it too much :-)

You can tune so many ways... Tune the injectors for 0 trim for ol target or in the middle. Put 850 start the car. If it says it's taking out 15 points just go to the maf table. Select all and press the minus button 10 times, restart and try again. When you get the idle set that way I t should be pretty close on the ol table.

Ol is just an additive that should hit the target afr in that table... Nothing to worry about if you have 10.5 and it hits 11.5.. The Ecuflash guys and romraider guys just made it target afr to make it easier for people to interpret.

Send me a pm if you have more questions.
Bamofo is offline   Reply With Quote
Old 04-11-2013, 11:03 AM   #3
the suicidal eggroll
Scooby Guru
 
Member#: 51961
Join Date: Jan 2004
Chapter/Region: RMIC
Location: Broomfield, CO
Vehicle:
2005 STi
2012 WRX

Default

Probably some non-linearity with those injectors, or some non-linearity with the stock injectors that was being compensated for with the MAF scaling that's now fighting the linearity of the IDs.

Yes, theoretically, you shouldn't need to touch the MAF scaling or load compensations when changing injectors, but 90% of the time you do.

Also make sure you've adjusted tip-in and per-cyl fueling compensations as well.
the suicidal eggroll is offline   Reply With Quote
Old 04-13-2013, 12:04 AM   #4
bswilmington
Scooby Specialist
 
Member#: 217563
Join Date: Jul 2009
Chapter/Region: South East
Location: Eden NC
Vehicle:
2006 Sti 12.68 @ 108
321WHP 422WTQ dynojet SAE

Default

Quote:
Originally Posted by the suicidal eggroll View Post
Probably some non-linearity with those injectors, or some non-linearity with the stock injectors that was being compensated for with the MAF scaling that's now fighting the linearity of the IDs.

Yes, theoretically, you shouldn't need to touch the MAF scaling or load compensations when changing injectors, but 90% of the time you do.

Also make sure you've adjusted tip-in and per-cyl fueling compensations as well.
Since you mentioned it, what are you guys doing to per cylinder fueling?? Zeroing it out?

Last edited by bswilmington; 04-13-2013 at 02:10 AM.
bswilmington is offline   Reply With Quote
Old 04-13-2013, 12:50 PM   #5
the suicidal eggroll
Scooby Guru
 
Member#: 51961
Join Date: Jan 2004
Chapter/Region: RMIC
Location: Broomfield, CO
Vehicle:
2005 STi
2012 WRX

Default

Quote:
Originally Posted by bswilmington View Post
Since you mentioned it, what are you guys doing to per cylinder fueling?? Zeroing it out?
Re-scaling the x-axis so that the same compensations are being applied at the same fuel flow, rather than the same IDC.
the suicidal eggroll is offline   Reply With Quote
Old 04-11-2013, 05:26 PM   #6
Bamofo
Scooby Specialist
 
Member#: 159743
Join Date: Sep 2007
Location: Plymouth Ma
Vehicle:
07 STI Limited
TurboMike Tuned 2.35

Default

Good catch. Per cylinder fueling tables first, then go through the quick steps I gave above and you should be set.
Bamofo is offline   Reply With Quote
Old 04-14-2013, 01:47 AM   #7
TurboJunkie85
Scooby Specialist
 
Member#: 193412
Join Date: Nov 2008
Chapter/Region: RMIC
Vehicle:
1985 pumas.
white

Default

Mulitply your Tip-ins by .54 the whole table. Also try 823.05CC/Min for your injector scale that's a 7% reduction off of your cruise. It should drop your +/- 3% cruise. if your having a hard time hitting the targets with the stuff above shown. Adjust the injector latency down further. Or to ID's Spec page which is
8V
2.280
10v
1.54
12v
1.14
14v
.91
16v
.73
TurboJunkie85 is offline   Reply With Quote
Old 04-15-2013, 11:09 PM   #8
TurboJunkie85
Scooby Specialist
 
Member#: 193412
Join Date: Nov 2008
Chapter/Region: RMIC
Vehicle:
1985 pumas.
white

Default

Or the other thing to do is to rescale your MAF
TurboJunkie85 is offline   Reply With Quote
Old 04-16-2013, 08:03 AM   #9
endrswrd
Scooby Specialist
 
Member#: 323908
Join Date: Jun 2012
Chapter/Region: MWSOC
Location: Dayton Ohio
Vehicle:
2013 BRZ ltd
ISM

Default

Yeah because it seems like you are only having issues at one end of the spectrum or the other, if tweaking latencies doesnt help you, then you may just need to push correction to the low end, and tweak the low end of your MAF scaling to get where you want to be. I say the low end, because you can usually get away with it on the low end without making a jagged MAF curve like you would if tweaking the top end sometimes. (You can feel the jagged curve in a pull if it is bad enough)
endrswrd 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

All times are GMT -4. The time now is 10:24 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.