Welcome to the North American Subaru Impreza Owners Club Wednesday July 23, 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 > Normally Aspirated Powertrain

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 12-01-2012, 11:13 AM   #1
wurlyvalve
Scooby Newbie
 
Member#: 73330
Join Date: Oct 2004
Chapter/Region: International
Location: England
Vehicle:
1998 Legacy BH9
Deep Red

Default Running lean at WOT/5000+rpm

Been running with my wideband lambda gauge for a little while now. Noticed, and accounted for with an SAFC, that above 4000rpm the AFR got richer and richer - linearly. I also noticed that I was losing manifold pressure (albeit gaining vacuum) as the revs went up at WOT.

Bing, light bulb illuminated, I've never changed the airfilter! Stripped her out and replaced with a clean K&N.

Fired the beast up and went for a spin, now, the moment I go over 5000rpm (WOT) the lambda gauge goes leaner than a lean thing and will only display " - - - " (which maybe means that it is somewhere beyond 18:1).

I even spruced the old SAFC up to +30%, but to no avail.

This is a JECS MAP ECU, circa 1998, which surely is running speed * density rather than alpha n? Would it not see a completely filled plenum now and fuel up? Maybe my fuel filter is in just as much a need of a replacement.
Is it common practise to change the fpr for an adjustable fuel pressure regulator? Or do people swap the NA injectors for turbo injectors?

I have rebuilt the engine, forgive me for my hazy memory but I have 7 different cars all of which with different specs and I forget what is what - and the beer doesn't help the memory either.
7 degrees later IVC
11:5 comp
phenolic TB spacer - 1"
phenolic manifold spacer - 1/4"
no TB heater pipe
ported heads
tubular manifold 32" pri 1-1/4", 60" total 1-5/8", 4-2-1 Equal length
2" exhaust system, single 2" cat, single straight through silencer
CAI
balanced bottom end
8kg flywheel and lightweight under pulley
earth strap mod
SAFC

Any tips on how to get more fuel in very welcome,
Thanks,
Glen.
* Registered users of the site do not see these ads.
wurlyvalve 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 12:30 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.