Welcome to the North American Subaru Impreza Owners Club Saturday January 31, 2015
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 > Engine Management & Tuning > Commercial ECU 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.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 09-17-2006, 07:22 AM   #1
xolosis
Scooby Newbie
 
Member#: 103373
Join Date: Dec 2005
Default MAF Scaling

I replaced my old panel filter with a K&N Unit. While I was installing into the stock box I noticed the first tuner didn't put the lid on the stock box properly. The Turbo Inlet Pipe was slightly too long and one edge of the box was left with a opening. Trimmed back the Turbo Inlet and made sure the box fitted perfectly on all edges nice and tight.

Went for a drive while logging and now A/F Learning is quite out and the car seems to be running lean. I had to compensate by going a richer in my fuel maps. The car definitly pulls harder especially up top as the old filter was filthy.

How can I fix this issue as I thought about re-scaling the injectors but that's not the right way to do it. Don't I need to compensate with re-scaling the MAF Scaling Maps? Here's a 3rd gear pull...

1=Engine Speed (RPM) 2=Air/Fuel Learning #1 (%) 3=Air/Fuel Correction #1 (%)

*1* *2* *3*
1710 -4.69 0
1780 -4.69 0
1884 -5.47 0
1974 -5.47 0
2064 -5.47 0
2152 -5.47 0
2256 -5.47 0
2356 -5.47 0
2450 -5.47 0
2575 -5.47 0
2689 -5.47 0
2801 -5.47 0
2952 -5.47 0
3089 -5.47 0
3260 -5.47 0
3423 -5.47 0
3621 -5.47 0
3786 -5.47 0
4028 -5.47 0
4226 -5.47 0
4403 -5.47 0
4595 -5.47 0
4786 -5.47 0
4992 -5.47 0
5180 -5.47 0
5331 -5.47 0
5546 -5.47 0
5705 -5.47 0
5878 -5.47 0
6039 -5.47 0
6167 -5.47 0
6251 -5.47 0
* Registered users of the site do not see these ads.
xolosis is offline   Reply With Quote
Old 09-19-2006, 06:56 AM   #2
xolosis
Scooby Newbie
 
Member#: 103373
Join Date: Dec 2005
Default

Can anyone comment?
xolosis is offline   Reply With Quote
Old 09-19-2006, 02:04 PM   #3
3barboost
Scooby Newbie
 
Member#: 73609
Join Date: Nov 2004
Chapter/Region: International
Location: Johannesburg South Africa
Vehicle:
2002 wrx
White

Default

nothing to add
subsribing and a free bump for you - i want to know as well
3barboost is offline   Reply With Quote
Old 09-19-2006, 03:22 PM   #4
Freon
Scooby Specialist
 
Member#: 88322
Join Date: Jun 2005
Chapter/Region: MWSOC
Location: Indianapolis, IN
Vehicle:
2009 BMW 135i

Default

I suggest logging what you have, plus MAF g/s, MAF voltage, IAT, front O2 lambda or air-fuel ratio, aftermarket wideband air-fuel ratio, and throttle position.

What you've posted isn't useful at all. Looks like it is full throttle, or at least open loop.
Freon is offline   Reply With Quote
Old 09-19-2006, 04:59 PM   #5
Zumble
Scooby Specialist
 
Member#: 34860
Join Date: Apr 2003
Chapter/Region: Tri-State
Location: NY
Vehicle:
2005 Forester CGM

Default

According to what you posted your car is actually running rich and the car is pulling back fuel.
Zumble is offline   Reply With Quote
Old 09-20-2006, 05:47 AM   #6
xolosis
Scooby Newbie
 
Member#: 103373
Join Date: Dec 2005
Default

Thanks guys,

Yeah its a full WOT pull so do I need to log those parameters that Freon said at idle or at cruise only?

Previously at WOT pulls A/F Learning would be dead on 0.
xolosis 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
Anyone have the maf scaling values for an Perrin Big MAF. Stock WRX injectors NITROS Open Source Reflashes 1 02-05-2008 07:57 PM
probably elementary questions - maf scaling, afr targets, UTEC wg control gpatmac UTEC 36 04-05-2006 06:11 PM
UTEC MAF Scaling? Ski Man Engine Management & Tuning 1 10-10-2005 09:48 AM
a/f learning and maf scaling deluxsti Engine Management & Tuning 2 06-06-2005 05:22 PM
what is MAF scaling? erggy Engine Management & Tuning 0 11-29-2004 12:36 PM


All times are GMT -4. The time now is 07:19 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.