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Old 03-11-2007, 07:13 PM   #1
Ray_STi
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Default 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 ?
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Old 03-11-2007, 07:43 PM   #2
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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.
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Old 03-11-2007, 08:01 PM   #3
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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
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Old 03-11-2007, 08:53 PM   #4
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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.
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Old 03-11-2007, 08:59 PM   #5
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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 ??
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Old 03-11-2007, 09:26 PM   #6
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No. You have something else wrong. A 25psi spike is enough to kill the motor.
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Old 03-11-2007, 09:28 PM   #7
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Quote:
Originally Posted by Ray_STi View Post
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.
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Old 03-11-2007, 10:32 PM   #8
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Quote:
Originally Posted by Ray_STi View Post
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?
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Old 03-11-2007, 11:13 PM   #9
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Curiously subscribed.
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Old 03-11-2007, 11:23 PM   #10
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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.
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Old 03-12-2007, 05:09 PM   #11
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I was hoping your boost gauge was elec. and not mech. That makes more sense then. Weird.
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Old 03-12-2007, 06:40 PM   #12
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I have no idea. Appreciate any help on the boost gauge issue.
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Old 03-12-2007, 09:24 PM   #13
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another curious subscriber...
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Old 03-12-2007, 09:49 PM   #14
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My defi boost gauge reads higher than my HYDRA!
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Old 03-12-2007, 10:16 PM   #15
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You should ask the guy who installed it what happened???? Now you see it? Now you don't?
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Old 03-13-2007, 01:07 AM   #16
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Get a wiring diagram for the Defi's and check it.
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Old 03-13-2007, 10:03 AM   #17
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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.
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Old 03-13-2007, 11:46 AM   #18
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Quote:
Originally Posted by modaddict View Post
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.
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Old 03-13-2007, 11:48 AM   #19
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Quote:
Originally Posted by Ray_STi View Post
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?
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Old 03-13-2007, 11:48 AM   #20
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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?
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Old 03-13-2007, 01:06 PM   #21
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Quote:
Originally Posted by cpasti View Post
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
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Old 03-13-2007, 01:21 PM   #22
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I will do that.. thanks.. As for the EM i'm running ECUTek.
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Old 03-29-2007, 03:30 AM   #23
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Quote:
Originally Posted by TheMadScientist View Post
IT IS NOT A SENSOR!!!!


What is the point of that thing? Emissions and how?
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Old 03-29-2007, 06:59 AM   #24
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^^^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...
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Old 03-29-2007, 07:25 AM   #25
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Originally Posted by modaddict View Post
^^^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
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