What is this sensor.. and WHY is it not on my car after install n tune.

Ray_STi · 03-11-2007, 07:13 PM

I just got a new turbo + APS inlet and other **** installed.

I just noticed yesterday that i found a un-connected lead.. I thut tht I am missing a sensor. I compared it with a friends sti and voila... its missing..

What is this sensor.. and what could be the reason that i dont have it in my car after the install ?

My friends Setup with stock turbo stock inlet hose stock boost control solenoid

My setup with GT52 and samco inlet hose, prodrive solenoid. Notice the missing grey sensor..

Why was it taken out ?

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MRX WRX · 03-11-2007, 07:43 PM

it is for the PCV system and to be honest with you it does not make a difference wether it is connected or not in fact i believe that if you install a Perrin type intake hose ,it is deleted. from what i can tell it alters the vacuum pulled on the top side of the PCV valve. i would not worry about it.

ShaggyGT · 03-11-2007, 08:01 PM

Just wrap it up with electrical tape. They set it up the proper way so that the CEL doesnt come on. Just tape it up and tuck it under the manifold.

-Matt

modaddict · 03-11-2007, 08:53 PM

When I put my Crawford Air/Oil separator, I had to take it out. It's a blow-by sensor I believe. basically it was a pressure switch, I believe. I pulled the metal "spade" out of the sensor, and plugged into the connector to make the circuit. That way it won't turn on the CEL.

just tuck it away. as long as the CEL isn't on, you're probably ok.

Ray_STi · 03-11-2007, 08:59 PM

does this have anything to do with my boost gauge showing 25 psi at wot for a while when my car is boosting a mere 17psi ??

ShaggyGT · 03-11-2007, 09:26 PM

No. You have something else wrong. A 25psi spike is enough to kill the motor.

modaddict · 03-11-2007, 09:28 PM

Quote:

Originally Posted by Ray_STi

does this have anything to do with my boost gauge showing 25 psi at wot for a while when my car is boosting a mere 17psi ??

OMFG!

you're engine is probably toast.

Badler · 03-11-2007, 10:32 PM

Quote:

Originally Posted by Ray_STi

does this have anything to do with my boost gauge showing 25 psi at wot for a while when my car is boosting a mere 17psi ??

That doesn't make sense. If it says 25psi, what makes you think your car is only boosting 17psi? Did you install the boost gauge? Where are you getting this info (25psi) from? Do you have EM?

Fred Fredburger · 03-11-2007, 11:13 PM

Curiously subscribed.

Ray_STi · 03-11-2007, 11:23 PM

EM is telling me 17 psi, we checked it on the dyno too.. Rob @ automaster was also freaked out, as he had put a feul cut or something at 17psi.. its may be the senor is goin nuts... i dunno.

Car is fine.. doing excellent. Its definately NOT boosting to 25+psi.. Defi BF imperial boost gauge gone mad.

The only thing that changed was this missing sensor. I somehow feel that this has something to do since it manipulates the pressure reading, and mebbe my boost gauge is tapped to this line. Nehow, i'll try and move the T joint elsewhere and see how it reacts.

Badler · 03-12-2007, 05:09 PM

I was hoping your boost gauge was elec. and not mech. That makes more sense then. Weird.

Ray_STi · 03-12-2007, 06:40 PM

I have no idea. Appreciate any help on the boost gauge issue.

RootUsr · 03-12-2007, 09:24 PM

another curious subscriber...

blueflu · 03-12-2007, 09:49 PM

My defi boost gauge reads higher than my HYDRA!

medamullet · 03-12-2007, 10:16 PM

You should ask the guy who installed it what happened???? Now you see it? Now you don't?

Badler · 03-13-2007, 01:07 AM

Get a wiring diagram for the Defi's and check it.

SuperSTI · 03-13-2007, 10:03 AM

Thats easy. That sensor is just a connector that connects the breather to the stock turbo inlet hose. Looks like you have a aftermarket one on the car. So it gets eliminated. I thought the same thing until I got my FPRed kit from perrin and the directions told me the same thing.

x99percent · 03-13-2007, 11:46 AM

Quote:

Originally Posted by modaddict

When I put my Crawford Air/Oil separator, I had to take it out. It's a blow-by sensor I believe. basically it was a pressure switch, I believe. I pulled the metal "spade" out of the sensor, and plugged into the connector to make the circuit. That way it won't turn on the CEL.

It's not a "sensor" at all... All the spade does is short the wires together.

Plugged in = no CEL, Unplugged = CEL. So, it just needs to be shorted out.

x99percent · 03-13-2007, 11:48 AM

Quote:

Originally Posted by Ray_STi

EM is telling me 17 psi, we checked it on the dyno too.. Rob @ automaster was also freaked out, as he had put a feul cut or something at 17psi.. its may be the senor is goin nuts... i dunno.

Exactly what "EM" do you have?

cpasti · 03-13-2007, 11:48 AM

Try a different mechanical boost gauge with your current hookup first and see what it reads, easy enough to try if you can get your hands on one.

As for the sensor, does anyone know "why" the aftermarket inlet pipes don't make provision to keep the sensor? It may not matter running it unhooked, but why not bother to make provision in the aftermarket inlet pipes to allow it to run as designed?

TheMadScientist · 03-13-2007, 01:06 PM

Quote:

Originally Posted by cpasti

Try a different mechanical boost gauge with your current hookup first and see what it reads, easy enough to try if you can get your hands on one.

As for the sensor, does anyone know "why" the aftermarket inlet pipes don't make provision to keep the sensor? It may not matter running it unhooked, but why not bother to make provision in the aftermarket inlet pipes to allow it to run as designed?

IT IS NOT A SENSOR!!!!

There is nothing in that housing just a jumper. Those are just PCV breather lines wich get rerouted with the install of some inlet hoses.
Get another boost gauge and check. Even a cheap autometer from autozone.

TMS

Ray_STi · 03-13-2007, 01:21 PM

I will do that.. thanks.. As for the EM i'm running ECUTek.

MRF582 · 03-29-2007, 03:30 AM

Quote:

Originally Posted by TheMadScientist

IT IS NOT A SENSOR!!!!

What is the point of that thing? Emissions and how?

modaddict · 03-29-2007, 06:59 AM

^^^I believe it is a switch. for blowby "sensing". Too much pressure, and the switch trips.

but im just pulling that out of my azz...

TheMadScientist · 03-29-2007, 07:25 AM

Quote:

Originally Posted by modaddict

^^^I believe it is a switch. for blowby "sensing". Too much pressure, and the switch trips.

but im just pulling that out of my azz...

Yup just pulled out of your ass.

Again IT IS NOT A SENSOR, SWITCH, OR ANYTHING!!!!

TMS

03-11-2007, 07:13 PM	#1
Ray_STi Scooby Newbie Member#: 97683 Join Date: Oct 2005 Chapter/Region: Tri-State Location: NJ Vehicle: 2005 WRX STi CGM/Gold - Element GT52	What is this sensor.. and WHY is it not on my car after install n tune. I just got a new turbo + APS inlet and other ** installed. I just noticed yesterday that i found a un-connected lead.. I thut tht I am missing a sensor. I compared it with a friends sti and voila... its missing.. What is this sensor.. and what could be the reason that i dont have it in my car after the install ? My friends Setup with stock turbo stock inlet hose stock boost control solenoid My setup** with GT52 and samco inlet hose, prodrive solenoid. Notice the missing grey sensor.. Why was it taken out ? * Registered users of the site do not see these ads.

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03-11-2007, 07:43 PM	#2
MRX WRX Scooby Specialist Member#: 114566 Join Date: May 2006 Chapter/Region: TXIC Location: houston Vehicle: 2005 STI aspen white	it is for the PCV system and to be honest with you it does not make a difference wether it is connected or not in fact i believe that if you install a Perrin type intake hose ,it is deleted. from what i can tell it alters the vacuum pulled on the top side of the PCV valve. i would not worry about it.

03-11-2007, 08:01 PM	#3
ShaggyGT * Banned * Member#: 19221 Join Date: May 2002 Chapter/Region: South East Location: Jacksonville, FL Vehicle: 2005 Legacy GT (STi) UR35R/Rotated Intake Mani	Just wrap it up with electrical tape. They set it up the proper way so that the CEL doesnt come on. Just tape it up and tuck it under the manifold. -Matt

03-11-2007, 08:53 PM	#4
modaddict Scooby Guru Member#: 95840 Join Date: Sep 2005 Chapter/Region: NWIC Location: Pasco, WA Vehicle: sold to a good bud awaiting next car	When I put my Crawford Air/Oil separator, I had to take it out. It's a blow-by sensor I believe. basically it was a pressure switch, I believe. I pulled the metal "spade" out of the sensor, and plugged into the connector to make the circuit. That way it won't turn on the CEL. just tuck it away. as long as the CEL isn't on, you're probably ok.

03-11-2007, 08:59 PM	#5
Ray_STi Scooby Newbie Member#: 97683 Join Date: Oct 2005 Chapter/Region: Tri-State Location: NJ Vehicle: 2005 WRX STi CGM/Gold - Element GT52	does this have anything to do with my boost gauge showing 25 psi at wot for a while when my car is boosting a mere 17psi ??

03-11-2007, 09:26 PM	#6
ShaggyGT * Banned * Member#: 19221 Join Date: May 2002 Chapter/Region: South East Location: Jacksonville, FL Vehicle: 2005 Legacy GT (STi) UR35R/Rotated Intake Mani	No. You have something else wrong. A 25psi spike is enough to kill the motor.

03-11-2007, 11:13 PM	#9
Fred Fredburger Scooby Specialist Member#: 2539 Join Date: Oct 2000 Location: Snohomish, WA, USA	Curiously subscribed.

03-11-2007, 11:23 PM	#10
Ray_STi Scooby Newbie Member#: 97683 Join Date: Oct 2005 Chapter/Region: Tri-State Location: NJ Vehicle: 2005 WRX STi CGM/Gold - Element GT52	EM is telling me 17 psi, we checked it on the dyno too.. Rob @ automaster was also freaked out, as he had put a feul cut or something at 17psi.. its may be the senor is goin nuts... i dunno. Car is fine.. doing excellent. Its definately NOT boosting to 25+psi.. Defi BF imperial boost gauge gone mad. The only thing that changed was this missing sensor. I somehow feel that this has something to do since it manipulates the pressure reading, and mebbe my boost gauge is tapped to this line. Nehow, i'll try and move the T joint elsewhere and see how it reacts.

03-12-2007, 05:09 PM	#11
Badler Scooby Guru Member#: 133597 Join Date: Nov 2006 Chapter/Region: SCIC Location: Orange	I was hoping your boost gauge was elec. and not mech. That makes more sense then. Weird.

03-12-2007, 06:40 PM	#12
Ray_STi Scooby Newbie Member#: 97683 Join Date: Oct 2005 Chapter/Region: Tri-State Location: NJ Vehicle: 2005 WRX STi CGM/Gold - Element GT52	I have no idea. Appreciate any help on the boost gauge issue.

03-12-2007, 09:24 PM	#13
RootUsr Scooby Specialist Member#: 39652 Join Date: Jul 2003 Chapter/Region: MAIC Location: Centreville Vehicle: 2007 WRX TR (UGM) R.I.P d00m Wagon	another curious subscriber...

03-12-2007, 09:49 PM	#14
blueflu * Banned * Member#: 142707 Join Date: Mar 2007 Chapter/Region: NWIC Location: missoula,mt Vehicle: 2002 wrx/sti/jdm... blue with custom paint	My defi boost gauge reads higher than my HYDRA!

03-12-2007, 10:16 PM	#15
medamullet Scooby Guru Member#: 99442 Join Date: Oct 2005 Chapter/Region: International Location: Man of Mystery Vehicle: 2006 SGM STI I'm on CORN YO!	You should ask the guy who installed it what happened???? Now you see it? Now you don't?

03-13-2007, 01:07 AM	#16
Badler Scooby Guru Member#: 133597 Join Date: Nov 2006 Chapter/Region: SCIC Location: Orange	Get a wiring diagram for the Defi's and check it.

03-13-2007, 10:03 AM	#17
SuperSTI Scooby Specialist Member#: 67182 Join Date: Jul 2004 Vehicle: 2004 Subaru STi 11.0 @ 128mph - 93/Meth	Thats easy. That sensor is just a connector that connects the breather to the stock turbo inlet hose. Looks like you have a aftermarket one on the car. So it gets eliminated. I thought the same thing until I got my FPRed kit from perrin and the directions told me the same thing.

03-13-2007, 11:48 AM	#20
cpasti Scooby Specialist Member#: 50582 Join Date: Dec 2003	Try a different mechanical boost gauge with your current hookup first and see what it reads, easy enough to try if you can get your hands on one. As for the sensor, does anyone know "why" the aftermarket inlet pipes don't make provision to keep the sensor? It may not matter running it unhooked, but why not bother to make provision in the aftermarket inlet pipes to allow it to run as designed?

03-13-2007, 01:21 PM	#22
Ray_STi Scooby Newbie Member#: 97683 Join Date: Oct 2005 Chapter/Region: Tri-State Location: NJ Vehicle: 2005 WRX STi CGM/Gold - Element GT52	I will do that.. thanks.. As for the EM i'm running ECUTek.

03-29-2007, 06:59 AM	#24
modaddict Scooby Guru Member#: 95840 Join Date: Sep 2005 Chapter/Region: NWIC Location: Pasco, WA Vehicle: sold to a good bud awaiting next car	^^^I believe it is a switch. for blowby "sensing". Too much pressure, and the switch trips. but im just pulling that out of my azz...