Welcome to the North American Subaru Impreza Owners Club Monday September 22, 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

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 04-18-2005, 03:33 PM   #1
STISTL
Scooby Newbie
 
Member#: 69659
Join Date: Sep 2004
Chapter/Region: South East
Location: Parkland, FL
Vehicle:
07 BMW 335
12.6 @ 111.1

Default ? About 05 AP

Looking at the live boost there seem to be a difference between the AP
and my boost gauge wich one is more accurate.

Thanks, Marcos
* Registered users of the site do not see these ads.
STISTL is offline   Reply With Quote
Old 04-18-2005, 03:58 PM   #2
dcwrx2
Scooby Specialist
 
Member#: 69005
Join Date: Aug 2004
Location: SoCal
Vehicle:
'04 4EAT Wgn
WRB

Default

AP reads the boost by tapping what boost signal received by the ECU, via the boost sensor. So AP basically reads what exactly the ECU reads. I'll say AP is accurate as long as the ECU is accurate, otherwise the ECU is seeing inaccurate boost from the sensor so the mapping is also incorrect. Anyway, how off is your readings between AP and the boost gauge?
dcwrx2 is offline   Reply With Quote
Old 04-18-2005, 04:03 PM   #3
STISTL
Scooby Newbie
 
Member#: 69659
Join Date: Sep 2004
Chapter/Region: South East
Location: Parkland, FL
Vehicle:
07 BMW 335
12.6 @ 111.1

Default

dcwrx2. Thanks for the quick replay dif is about 2 psi more or less at WOT ( for a moment) then it goes down to 1.-.5 more than the boost gauge. BTW I have Autometer Gauge
Thanks, Marcos

Last edited by STISTL; 04-18-2005 at 04:07 PM. Reason: more info
STISTL is offline   Reply With Quote
Old 04-18-2005, 04:56 PM   #4
dcwrx2
Scooby Specialist
 
Member#: 69005
Join Date: Aug 2004
Location: SoCal
Vehicle:
'04 4EAT Wgn
WRB

Default

I heard from local tech that autometer isn't very good in accuracy (even though I was considering autometer at first, I eventually ordered Defi after some recommendations). I'm not saying your autometer is defective, but if you get inconsistant boost readings and sometimes it is "more" and sometimes it is "less", I think it's acceptable. Maybe it is due to the internal structure of the gauge such as coil springs, or the rubber hose connecting between the gauge and the T-connector flexes/shrinks due to sudden change in pressure. If you getting "always more" or "always less", then there is really a problem.
Use your boost gauge as an indication of abnormal boost spikes or surges, rather than keep monitoring for its accuracy, may keep you away from worrying about it. ;-) Afterall, these gauges only give you approximate value for reference. Most stock speedometers when used with stock size tires, are set to have slightly higher reading for "safety" issues too. When you read 70mph on speedometer, you maybe actually running at 65-68 mph.
dcwrx2 is offline   Reply With Quote
Old 04-18-2005, 05:17 PM   #5
STISTL
Scooby Newbie
 
Member#: 69659
Join Date: Sep 2004
Chapter/Region: South East
Location: Parkland, FL
Vehicle:
07 BMW 335
12.6 @ 111.1

Default

It makes perfect sense Thanks BRO....
STISTL is offline   Reply With Quote
Old 04-18-2005, 05:35 PM   #6
South Coast Subaru
NASIOC Vendor
 
Member#: 21173
Join Date: Jul 2002
Location: Costa Mesa, CA
Vehicle:
2003 WRX Sedan
BLue

Default

Definitely ap is more accurate.
Ferdie
www.southcoastperformance.com
South Coast Subaru is offline   Reply With Quote
Old 04-18-2005, 05:42 PM   #7
dcwrx2
Scooby Specialist
 
Member#: 69005
Join Date: Aug 2004
Location: SoCal
Vehicle:
'04 4EAT Wgn
WRB

Default

I vote for these suggestions to Cobb:
1) In next generation AP, add an analog gauge on the AP which incorporates with the "read live boost" feature.
2) Make an AP "pod mount" or "steering column mount" so we can mount the AP and read off the boost accurately with no mess.
dcwrx2 is offline   Reply With Quote
Old 04-18-2005, 09:15 PM   #8
WRC-Go
Scooby Newbie
 
Member#: 29917
Join Date: Nov 2002
Location: Appalachian Mountains VA
Vehicle:
2003 WRXWgn-WRB sold
EVO IX-MR, 98 Viper

Default

Is this feature (live boost) available on the AP for 02/03 WRXs? I can't find any mention whatsoever of it in the manual that accompanied my AP. 04/05 only mebbe??
WRC-Go is offline   Reply With Quote
Old 04-18-2005, 09:27 PM   #9
dcwrx2
Scooby Specialist
 
Member#: 69005
Join Date: Aug 2004
Location: SoCal
Vehicle:
'04 4EAT Wgn
WRB

Default

It doesn't mention in the User Manual for 04-05 AP too, but it is the feature on the main menu, scroll to the bottom (probably under "Revert to Stock"). Not sure if 02-03 gets this feature though...

Last edited by dcwrx2; 04-19-2005 at 01:19 PM.
dcwrx2 is offline   Reply With Quote
Old 04-19-2005, 01:00 PM   #10
WRC-Go
Scooby Newbie
 
Member#: 29917
Join Date: Nov 2002
Location: Appalachian Mountains VA
Vehicle:
2003 WRXWgn-WRB sold
EVO IX-MR, 98 Viper

Default

Just checked and it's there; odd there's nothing in the users manual about this feature.

Anyway, it works well.
WRC-Go is offline   Reply With Quote
Old 04-19-2005, 01:24 PM   #11
dcwrx2
Scooby Specialist
 
Member#: 69005
Join Date: Aug 2004
Location: SoCal
Vehicle:
'04 4EAT Wgn
WRB

Default

I made a gimp "mount" for the AP so I can use it as a temporary digital boost gauge on the way I drive to work, hehe... The way I did is to pull out the cup holder between the stereo and the A/C vent (not sure if it's the same for other WRXs), then run the black DiagPort-to-AP cable thru the hole of the cup holder, place the AP above the cup holder, and connect the cable to the AP. Then, fasten the AP with some regular rubber bands with the A/C vent behind the AP, and the cup holder. It looks stupid, but as I said, it's a good for temporary solution, lol.... BTW, if you use black rubber band instead of yellowish brown like mine, it looks nicer coz the color matches, hehe.
dcwrx2 is offline   Reply With Quote
Old 04-19-2005, 01:27 PM   #12
crazymikie
Scooby Specialist
 
Member#: 56321
Join Date: Mar 2004
Chapter/Region: NESIC
Location: Hopkinton, MA
Vehicle:
2006 Honda El Camino
Green

Default

The one thing to consider is that the AP can only sample data from the ECU a finite number of times per second. IIRC, for one parameter, you can read it about once every 100msecs.

With a boost gauge, you will see fluctuations/spikes that get missed by the sampling rate of the AP.


Mike
crazymikie is offline   Reply With Quote
Old 04-19-2005, 02:28 PM   #13
dcwrx2
Scooby Specialist
 
Member#: 69005
Join Date: Aug 2004
Location: SoCal
Vehicle:
'04 4EAT Wgn
WRB

Default

I understand, and I have the gauges sitting at home. I'm just waiting for a time that I don't need to work so that I can have time to do the installation work. =)
BTW, AP shows the boost samples at about 4 times per second.
dcwrx2 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
FS: 04 ap v1 and 05 ap v1 Carbon888 Engine/Power/Exhaust 7 04-23-2008 01:27 PM
04 Ap,05 Ap?? Dizzuque Newbies & FAQs 2 11-13-2006 10:10 AM
we know the 02/03 requires brackets for an 05 front end swap, how about 05 to 02/03? bigworm Interior & Exterior Modification 5 02-21-2006 10:13 AM
Question about Cobb AP Stage 2. sticky tires Engine Management & Tuning 8 01-06-2005 03:35 PM
Question about Cobb AP & Utec Way2Slow Engine Management & Tuning 1 01-02-2005 10:15 PM


All times are GMT -4. The time now is 07:01 AM.


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.