Welcome to the North American Subaru Impreza Owners Club Thursday March 28, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo)

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.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 01-05-2002, 04:20 PM   #1
Fubaru
Scooby Specialist
 
Member#: 6046
Join Date: Apr 2001
Chapter/Region: BAIC
Location: San Francisco
Vehicle:
'08 Prius

Default Is this ok place to tap for boost pressure reading

Found this picture from another thread:
Can you tell me if this tap will work especially if you speak from experience... I need to tap another spot for boost pressure reading and I'd like to avoid trial & error.
* Registered users of the site do not see these ads.
Fubaru is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 01-05-2002, 04:47 PM   #2
tdman77
Scooby Specialist
 
Member#: 9832
Join Date: Aug 2001
Chapter/Region: South East
Location: Orlando, FL
Vehicle:
2022 WRX
Magnetite Gray

Thumbs up

There was a long discussion on this a couple of months back and this place was determined to be the best place. For you doubters do a search and check out the thread. This was proven with actual road tests.
tdman77 is offline   Reply With Quote
Old 01-05-2002, 04:48 PM   #3
blue-ej20
Scooby Specialist
 
Member#: 10413
Join Date: Sep 2001
Chapter/Region: BAIC
Location: Where the heck am i?
Vehicle:
hey is that a kia
sephia?

Default

i tapped mine to the hose that is connected to the stock bov, i found it on this site...http://www.f1carsets.com/wrx/docs/gauges.html
have fun!
blue-ej20 is offline   Reply With Quote
Old 01-05-2002, 04:58 PM   #4
Fubaru
Scooby Specialist
 
Member#: 6046
Join Date: Apr 2001
Chapter/Region: BAIC
Location: San Francisco
Vehicle:
'08 Prius

Default

Yeah I know this is a well-covered territory but
the tap in this picture here was what was discussed,
which is where I have a tap now:


What about the tap shown in the first picture? Equivalent?
Fubaru is offline   Reply With Quote
Old 01-05-2002, 05:42 PM   #5
V6TurboTA
Scooby Guru
 
Member#: 9090
Join Date: Aug 2001
Location: < of Boston
Vehicle:
09 Forester Gump
02WRX->04STi->09Gump

Default

Those are both tapping into the manifold. The first pic is the way I did it and is the easiest way to do it. The other pic is tapping into the same place with about 5 times the amount of work.

I dont know why you would read from the BOV for manifold pressure (like the stock setup), but I'd rather read directly from the manifold. And you need no tools to install it there. Mines all slip fittings, no clamps. Boost gauge can be removed completely without 1 tool in about 5 minutes.

~v6

edit: There is no need to modify ANYTHING if you install it like in the first pic. Even tho the pic shows the hose being cut and the adapter put in between the splice. I just pull off the stock hose, attach the stock hose to one end of my T fitting, got a 2" piece of windshield washer line and went from the other side of the T to the manifold. I dont reccommend cutting any factory lines that you dont need to. You'll probably appreciate it later.
V6TurboTA is offline   Reply With Quote
Old 01-05-2002, 06:38 PM   #6
bliz
Scooby Specialist
 
Member#: 12065
Join Date: Nov 2001
Location: Newark,DE
Vehicle:
08 evo x mr
wicked white slow pos

Default

was going to ask the same question evently,i tapped the first place showen,but my guage reads 15hg instead of 20hg,is this right.
bliz is offline   Reply With Quote
Old 01-05-2002, 07:00 PM   #7
zsurfrin
Scooby Newbie
 
Member#: 11034
Join Date: Oct 2001
Location: Jacksonville
Vehicle:
2002 WRX
Platinum Silver

Default

I tapped right off of the manifold that is shown in the first pic. The only thing i did differently was i ran the hose aroung the other way and concealed the hose. The first pic shown looks very unprofessional. I prefer keeping the engine compartment uncluttered, therefore, as stock as possible.
zsurfrin is offline   Reply With Quote
Old 01-05-2002, 08:30 PM   #8
enphorcerWRX
Scooby Newbie
 
Member#: 8030
Join Date: Jul 2001
Location: Woodbridge, NJ
Vehicle:
2002 WRX
Platinum Silver Wagon

Default

Did you guys see where the BOV line originates from? If not, its right from the intake manifold. You just have to follow the hose closely, its easy to loose sight of it under there. Give it a try.

Dan
enphorcerWRX is offline   Reply With Quote
Old 01-05-2002, 08:50 PM   #9
tdman77
Scooby Specialist
 
Member#: 9832
Join Date: Aug 2001
Chapter/Region: South East
Location: Orlando, FL
Vehicle:
2022 WRX
Magnetite Gray

Default

Quote:
Originally posted by enphorcerWRX
Did you guys see where the BOV line originates from? If not, its right from the intake manifold. You just have to follow the hose closely, its easy to loose sight of it under there. Give it a try.

Dan
Yeah and so? I don't know about you but I would reather have my boost reading coming from as close to the combustion chamber as possible. This is where you need to be taking the reading from.
tdman77 is offline   Reply With Quote
Old 01-05-2002, 10:23 PM   #10
Jon [in CT]
*** Banned ***
 
Member#: 2992
Join Date: Nov 2000
Chapter/Region: NESIC
Location: Connecticut, USA
Vehicle:
02 WRX Sedan
Silver

Default

Our WRX's MAP sensor reads boost at the throttle body and one would presume that FHI engineers had the luxury of putting it anywhere they wanted. It would be nice if everyone installed their boost line connection at the same place since it would make people's boost reports more useful.

Anyway, here are some other discussions:
http://www.i-club.com/forums/showthr...threadid=40218
http://www.i-club.com/forums/showthr...threadid=96975
Jon [in CT] is offline   Reply With Quote
Old 01-06-2002, 12:02 PM   #11
hman
Scooby Specialist
 
Member#: 3747
Join Date: Jan 2001
Location: Campbell, CA
Vehicle:
2002 Impreza WRX
Platinum Silver Metallic

Default

I connected my "T" to the hose that is connected to the stock bov too. I followed the OEM boost gauge instruction. I think both spots are ok. I do agree with Jon [in CT] that we all should have a standardize spot, so that we can get more consistent reading for all.
hman is offline   Reply With Quote
Old 01-06-2002, 03:07 PM   #12
bdowell
Scooby Newbie
 
Member#: 7524
Join Date: Jun 2001
Location: TN
Vehicle:
2002 WRX Sedan
Platinum Silver

Default

I attached my SBC-iD to the stock bypass valve, could this affect my readings since the SBC-iD is more than a gauge? Should I move it to the manifold?
bdowell is offline   Reply With Quote
Old 01-06-2002, 03:11 PM   #13
Fubaru
Scooby Specialist
 
Member#: 6046
Join Date: Apr 2001
Chapter/Region: BAIC
Location: San Francisco
Vehicle:
'08 Prius

Default

The Blitz instructions recommends tapping after the throttle...
You'll probably see more transient boost spikes at the bypass valve line when the throttle shuts
Fubaru is offline   Reply With Quote
Old 01-06-2002, 04:06 PM   #14
bdowell
Scooby Newbie
 
Member#: 7524
Join Date: Jun 2001
Location: TN
Vehicle:
2002 WRX Sedan
Platinum Silver

Default

Sorry to ask, but what do you mean, after the throttle? My instructions were in Japanese so I made the best out of what I had So I should move it? But to where? thanks!
bdowell is offline   Reply With Quote
Old 01-06-2002, 05:38 PM   #15
Rocky WRX
Scooby Specialist
 
Member#: 9837
Join Date: Sep 2001
Chapter/Region: RMIC
Location: Evergreen CO
Vehicle:
2015 Forester XT
Blue

Default

No worries, bdowell. The BOV hose taps the mainfold past (i.e. downstream of) the throttle, as does the FPR hose. IMHO, any pressure differences between these various manifold tap points will be very minor, if any, as long as they are downstream of the throttle. These arguments seem to repeat every couple of months on this forum. The only location that is 100% wrong is tapping upstream of the throttle, such as off the IC.
Rocky WRX is offline   Reply With Quote
Old 01-06-2002, 06:36 PM   #16
Fubaru
Scooby Specialist
 
Member#: 6046
Join Date: Apr 2001
Chapter/Region: BAIC
Location: San Francisco
Vehicle:
'08 Prius

Default

Rocky, I think the BOV is definitely upstream of the throttle body.
Isn't the valve right off the intercooler & not the plenum?
Anyway, when I had my gauge tapped off the BOV I saw huge spikes (around 18psi) when accelerating hard & upshifting...
those spikes disappeared when I moved the tap to the FPR hose.
Bdowell, I have an .pdf copy of the blitz instructions in english which I can send ya.
Fubaru is offline   Reply With Quote
Old 01-06-2002, 08:56 PM   #17
Jon [in CT]
*** Banned ***
 
Member#: 2992
Join Date: Nov 2000
Chapter/Region: NESIC
Location: Connecticut, USA
Vehicle:
02 WRX Sedan
Silver

Default

The WRX's bypass valve's vacuum hose is definitely connected downstream from throttle body. Let me quote an Imprezer (AKA Imprezident) post from a thread I cited earlier:
Quote:
I do not recommend using this location [the one depicted by Fubaru] for boost gauge or boost controller. Better just leave that hose/nipple untouched. It is a part of stock idle control system and gets wrong readings sometimes casuing the boost gauge or boost controller to see wrong pressure and your idle control system to wig out. All this have been confirmed by TEC II datalogging and many hours of observation.

The best place to tap for a good souce of vaccum/pressure, is the BOV vacuum line. Look at your BOV. You will see that there is a vaccum line connected to it. About 2" away from the BOV the line will have a rubber jacket on it. Under that jacket is an inline connector. Simple replace that connector with a T and you are set.

-Alex
So, let me recap. You can "eliminate" boost spikes by running a rubber hose an extra few feet to the front of your engine from your boost gauge / ebc to soak up those spikes. Or you can measure your true boost by tapping the bypass valve's vacuum/boost line.

I've been gone 5 weeks. I missed this "banter."
Jon [in CT] is offline   Reply With Quote
Old 01-06-2002, 09:28 PM   #18
Fubaru
Scooby Specialist
 
Member#: 6046
Join Date: Apr 2001
Chapter/Region: BAIC
Location: San Francisco
Vehicle:
'08 Prius

Default

I know this has been beat to death, sorry

Jon: isn't the stock bypass valve that bronze colored guy with the
letter "Z" printed on it (shown in the first picture above) and the vacuum line is coming off it to the right. So isn't the bypass valve connected to the intercooler, therefore it's upstream of the Tb???
The boost spikes are therefore real transient spikes that the manifold doesn't see (?)

Anyway, I haven't heard of anybody having idle problems going the other way ... and as you pointed out in the older thread the OEM gauge instructions seems to contradict itself on this.

Last edited by Fubaru; 01-06-2002 at 09:34 PM.
Fubaru is offline   Reply With Quote
Old 01-06-2002, 10:53 PM   #19
Rocky WRX
Scooby Specialist
 
Member#: 9837
Join Date: Sep 2001
Chapter/Region: RMIC
Location: Evergreen CO
Vehicle:
2015 Forester XT
Blue

Default

Jon, thanks for the very interesting words from Imprezer. Please don't stay away for so long next time. I'm still not certain of cause vs. effect. Is he saying that the gauge readings using the idle control hose are incorrect (i.e. the gauge reads phantom spikes induced by the idle control system in its hose), or that tapping that hose causes the idle control system to induce real spikes that can possibly damage the engine? He mentions boost controller issues, but no one here has talked about using that hose to do anything other than read pressure. I don't see how a couple of extra feet of hose is going to soak up much of a spike though.

IIRC, most of the previous arguments I've followed have been 'FPR' vs 'BOV'.

Regarding the BOV, it is bolted to the IC, and when it opens, it vents the IC pressurized air upstream from the throttle, back into the pre-turbo air intake pipe. However, the hose that provides the pressure/vacuum to open or close the BOV, is connected to the intake manifold, downstream of the throttle. That's the hose that people tap for their boost gauge. It's the little hose coming off the side of the BOC crown. If you follow it, you will find that it attaches to the intake manifold.
Rocky WRX 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
good place to tap for boost gauge? ted@mb Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 15 07-07-2006 12:28 PM
Best place to tap for boost gauge on 05 STI? Inprogress Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 5 09-20-2004 01:06 PM
ideal place to tap for boost reading R.C.Y.K. Electrical & Lighting 6 11-17-2003 04:04 PM
Easiest place to tap for Oil Pressure guage. Kwyjibo Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 9 01-13-2003 05:27 PM
Here is the best place to tap for a Boost Gauge....(big pics) Jimmy S. Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 16 12-15-2001 04:22 AM

All times are GMT -4. The time now is 06:06 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.