Welcome to the North American Subaru Impreza Owners Club Wednesday August 20, 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 > Engine Management & Tuning > AccessPort

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 05-18-2007, 04:26 PM   #1
sajohnson
Scooby Specialist
 
Member#: 6140
Join Date: Apr 2001
Chapter/Region: MAIC
Location: Middletown, MD, USA
Vehicle:
2002 WRX 5MT Sedan
WR Blue. Cobb Stage 2

Default AP Stage 2, 93 octane v1.30: Hesitation and low boost

I did a search and read through the threads that came up but couldn't find a solution to my problem. I'm hoping someone here can help.

My WRX is basically stock except for the Cobb catted DP, intake silencer removed, grounding mod, and a K&N panel filter in the stock air box. The exhaust behind the DP is stock -- resonator pipe and muffler.

I've been happy with stage 2. It runs pretty much as advertised -- more power but more importantly, more 'area under the curve'. There is more torque down low. I can generally use a higher gear in most situations now -- 4th instead of 3rd to pass on the highway, or to climb a steep hill.

The problem is, periodically, it seems to lose power and/or hesitate a bit -- instead of the relatively smooth linear power delivery that I'm used to (once the turbo spools up). I've checked the boost a few times using the AP when it seems slower than usual and sure enough, it is a couple psi low -- maybe a max. of 13.2 psi.

The problems remain until I reset the ECU. Then the boost returns to normal (15.3 to 15.8 psi) and the hesitation goes away, for a while. Then it returns.


Any idea what might be causing this?


* Registered users of the site do not see these ads.
sajohnson is offline   Reply With Quote
Old 05-18-2007, 04:38 PM   #2
t4nk
Scooby Specialist
 
Member#: 129905
Join Date: Oct 2006
Chapter/Region: AKIC
Location: Katy, TX & Anchorage, AK
Vehicle:
2005 WRB WRX
2003 F-350SD, 7.3PSD

Default

sounds like your IAM is taking a fall..
know anyone with a tactrix and enginuity to take a log??
t4nk is offline   Reply With Quote
Old 05-18-2007, 06:31 PM   #3
sajohnson
Scooby Specialist
 
Member#: 6140
Join Date: Apr 2001
Chapter/Region: MAIC
Location: Middletown, MD, USA
Vehicle:
2002 WRX 5MT Sedan
WR Blue. Cobb Stage 2

Default

Quote:
Originally Posted by t4nk View Post
sounds like your IAM is taking a fall..
know anyone with a tactrix and enginuity to take a log??
OK, I searched this forum and the FAQ's hoping I wouldn't have to ask, but no luck. What does IAM stand for?

I found lots of references to it in the various threads I read, but no explanation -- only that if it drops below a certain threshold bad things happen.

I don't know anyone with a tactrix. Is that required to do the necessary data logging, or can I use something else? IIRC, one of the threads I looked at listed a few different types of software. It seemed most could be run on any notebook PC and the PC connected to the OBD II port by using the Cobb AP cable and a serial>USB adapter (all of which I have).

I'm interested in engine management anyway, so if it isn't too difficult and/or expensive I'd like to give it a shot.

Meanwhile, it's not a huge problem -- I can reset the ECU anytime I want and that usually clears it up for a while. I'd just like to know what the cause is -- IOW, is it something serious like detonation or just a software or ECU learning glitch?

Any suggestions will be appreciated.
sajohnson is offline   Reply With Quote
Old 05-18-2007, 07:06 PM   #4
t4nk
Scooby Specialist
 
Member#: 129905
Join Date: Oct 2006
Chapter/Region: AKIC
Location: Katy, TX & Anchorage, AK
Vehicle:
2005 WRB WRX
2003 F-350SD, 7.3PSD

Default

Ignition advance multiplier.

Basicly, the higher the number, the better the performance.

When you reset, its default value is 12 I beleive.. Max is 16 (where u wanna be!) and once u get below 8, it cuts boost and pulls ignition. Meaning something bad is occuring. I wouldn't just keep on resetting every time the IAM falls down, Whatever is making the IAM fall is still occuring, and could be killing your engine slowly but surely..

You could use other things, But I HIGHLY recommend a Tactrix cable and Enginuity for logging.. Its 80 bucks.. Cant beat that.

It could be detonation, severe knock, bad fuel, bad ignition (plugs). IT could be a lot of things bringing the IAM down.. In order to find out what it is, you need to log knock correctio and ignition timing to find out if they are within a good range or not. If they are i'd say its most likely bad fuel or plugs maybe..
t4nk is offline   Reply With Quote
Old 05-18-2007, 07:37 PM   #5
sajohnson
Scooby Specialist
 
Member#: 6140
Join Date: Apr 2001
Chapter/Region: MAIC
Location: Middletown, MD, USA
Vehicle:
2002 WRX 5MT Sedan
WR Blue. Cobb Stage 2

Default

Quote:
Originally Posted by t4nk View Post
Ignition advance multiplier.

Basicly, the higher the number, the better the performance.

When you reset, its default value is 12 I beleive.. Max is 16 (where u wanna be!) and once u get below 8, it cuts boost and pulls ignition. Meaning something bad is occuring. I wouldn't just keep on resetting every time the IAM falls down, Whatever is making the IAM fall is still occuring, and could be killing your engine slowly but surely..

You could use other things, But I HIGHLY recommend a Tactrix cable and Enginuity for logging.. Its 80 bucks.. Cant beat that.

It could be detonation, severe knock, bad fuel, bad ignition (plugs). IT could be a lot of things bringing the IAM down.. In order to find out what it is, you need to log knock correctio and ignition timing to find out if they are within a good range or not. If they are i'd say its most likely bad fuel or plugs maybe..
Thank you t4nk!

Where is a good place to buy the cable and software?

How does the Enginuity software compare to using an off-the-shelf dedicated engine analyzer?

Is the cable necessary? No problem if it is, but I do have the Cobb AP cable and a high quality serial>USB converter.

Another question -- if there is a problem with knock, detonation, mis-fire, etc, wouldn't I be seeing a CEL, or at least have error codes stored in the ECU? I've never had any at all.
sajohnson is offline   Reply With Quote
Old 05-18-2007, 11:02 PM   #6
t4nk
Scooby Specialist
 
Member#: 129905
Join Date: Oct 2006
Chapter/Region: AKIC
Location: Katy, TX & Anchorage, AK
Vehicle:
2005 WRB WRX
2003 F-350SD, 7.3PSD

Default

you can get the cable from tactrix.com
for the programs, PM me after u get ur cable and ill get u hooked up bro.
Enginuity is one of the best loggers out there, you can also view WAY more live data than your APv2.. You can view EVERY sensor and switch on the car.

the cable isnt necessary.. but highly recommended.. some ppl can get their apv2 cable to work, some ppl cant.

Your cobb ap disables some of your cel's.. and i dont know which ones.. so i cant really be sure on if u'd get a cel or not.. I think the CEL comes on if the IAM falls below a certain value..
t4nk 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
v1 Cobb AP Stage 2 93 v130 Map Question tyc17afguy AccessPort 7 03-18-2007 11:14 PM
AP Stage 2 93 hesitation around 4-5k rpm? rmarceau AccessPort 0 03-09-2007 09:06 AM
F/S:cobb stage 2 93 octane reflashed ecu for sale moorebl Private 'For Sale' Classifieds 0 11-11-2004 12:41 PM
Cobb AccessECU Stage 2 - 93 Octane mweinst Private 'For Sale' Classifieds 9 04-18-2004 08:34 PM
AccessECU Stage 2 93 octane questions... Hank3 Engine Management & Tuning 14 05-17-2003 05:03 PM


All times are GMT -4. The time now is 10:33 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.