Accuracy of AP live boost read

d40winker · 02-21-2007, 05:46 PM

Hey everyone,

Since the AP is reading the bost from the ecu, is it as accurate as the oem boost gage? Im upping my wastegate actuator and the readings are quite different from the gauge to the AP live boost. Any ideas?

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Airboy · 02-21-2007, 06:14 PM

How different is "quite different"?

d40winker · 02-21-2007, 10:53 PM

I push .1 bar on stock gauge which is I think 14.7 psi, and the AP is reading 16.4.

parker/slc/gc8fan · 02-22-2007, 01:01 PM

I would consider the AP more accurate.

It's simply interperating the what the stock ECU thinks your boost is.

d40winker · 02-23-2007, 09:36 AM

That's strange I would think the boost gauge would be more accurate because of the fact that it's tapped in, not just electronically reading it. Any other input?

Force · 02-23-2007, 10:26 PM

I think that the ECU is the most accurate, especially if you have a mechanical boost gauge....I mean it's like doing math by hand vs. using a calculator...the calculator will always be a step faster and a step more accurate 99% of the time. The sensors in the engine are more accurate than the spring in a mechanical boost gauge IMO. However, both my AP and Mech. boost gauge read about the same and at most are maybe .5 PSI different sometimes.

El Capitan · 02-23-2007, 10:42 PM

If you are talking about the colum mounted boost gauge, it isn't reading bars. The stock gauge reads in MPa & .1MPa is 14.5psi.

16.5psi is .113MPa. I'd say that based on how small that gauge is that the AP and the gauge are real close. I have the same set up and it's pretty much the same based on trying to look down and drive at the same time.

Convertion tool link.
http://www.chapelsteel.com/psi-mpai.html

Silver_Bell_WRX · 02-25-2007, 07:15 PM

My ap and autometer boost guages both read the same up to the limits of what the ap will read. Max boost ap reads is 18.4 were a regular boost gauge can read higher if it has the range.
Mike

jruben4 · 03-02-2007, 10:15 AM

Quote:

Originally Posted by d40winker

That's strange I would think the boost gauge would be more accurate because of the fact that it's tapped in, not just electronically reading it. Any other input?

I thought the stock boost gauge reads the ECU boost data, not a true vacuum line - doesn't it install with just an electrical connection?

VWGrk1 · 03-02-2007, 04:23 PM

No, the boost line is T'd off from the BPV line.

02-21-2007, 05:46 PM	#1
d40winker Scooby Newbie Member#: 128010 Join Date: Oct 2006 Chapter/Region: Tri-State Location: NJ Vehicle: 2002 Impreza WRX white	Accuracy of AP live boost read Hey everyone, Since the AP is reading the bost from the ecu, is it as accurate as the oem boost gage? Im upping my wastegate actuator and the readings are quite different from the gauge to the AP live boost. Any ideas? * Registered users of the site do not see these ads.

02-23-2007, 10:42 PM	#7
El Capitan Scooby Specialist Member#: 121261 Join Date: Jul 2006 Chapter/Region: TXIC Location: New Bern, NC Vehicle: 06 STG 2+ STi CGM	If you are talking about the colum mounted boost gauge, it isn't reading bars. The stock gauge reads in MPa & .1MPa is 14.5psi. 16.5psi is .113MPa. I'd say that based on how small that gauge is that the AP and the gauge are real close. I have the same set up and it's pretty much the same based on trying to look down and drive at the same time. Convertion tool link. http://www.chapelsteel.com/psi-mpai.html Last edited by El Capitan; 02-23-2007 at 10:50 PM.

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02-21-2007, 06:14 PM	#2
Airboy Scooby Specialist Member#: 72829 Join Date: Oct 2004 Chapter/Region: W. Canada Location: Calgary, Canada Vehicle: 2006 HTA68'd wagon Powered by RomRaider	How different is "quite different"?

02-21-2007, 10:53 PM	#3
d40winker Scooby Newbie Member#: 128010 Join Date: Oct 2006 Chapter/Region: Tri-State Location: NJ Vehicle: 2002 Impreza WRX white	I push .1 bar on stock gauge which is I think 14.7 psi, and the AP is reading 16.4.

02-22-2007, 01:01 PM	#4
parker/slc/gc8fan Scooby Specialist Member#: 46241 Join Date: Oct 2003 Chapter/Region: RMIC Location: N. Salt Lake City, UT Vehicle: - RIP SDF-1	I would consider the AP more accurate. It's simply interperating the what the stock ECU thinks your boost is.

02-23-2007, 09:36 AM	#5
d40winker Scooby Newbie Member#: 128010 Join Date: Oct 2006 Chapter/Region: Tri-State Location: NJ Vehicle: 2002 Impreza WRX white	That's strange I would think the boost gauge would be more accurate because of the fact that it's tapped in, not just electronically reading it. Any other input?

02-23-2007, 10:26 PM	#6
Force Scooby Specialist Member#: 123515 Join Date: Aug 2006 Location: park ridge, Illinois Vehicle: 2005 vette c6 z51 LeMans Blue	I think that the ECU is the most accurate, especially if you have a mechanical boost gauge....I mean it's like doing math by hand vs. using a calculator...the calculator will always be a step faster and a step more accurate 99% of the time. The sensors in the engine are more accurate than the spring in a mechanical boost gauge IMO. However, both my AP and Mech. boost gauge read about the same and at most are maybe .5 PSI different sometimes.

02-25-2007, 07:15 PM	#8
Silver_Bell_WRX Scooby Specialist Member#: 7677 Join Date: Jun 2001 Location: Burlington, VT Vehicle: 2005 WRX Blue	My ap and autometer boost guages both read the same up to the limits of what the ap will read. Max boost ap reads is 18.4 were a regular boost gauge can read higher if it has the range. Mike

03-02-2007, 04:23 PM	#10
VWGrk1 Scooby Specialist Member#: 57882 Join Date: Mar 2004 Chapter/Region: MWSOC Location: Chicago Vehicle: 2004 WRX WRB	No, the boost line is T'd off from the BPV line.