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Old 09-23-2001, 06:18 PM   #1
Force[FED]
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Smile Completed Greddy oil pressure gauge install!

I finally took the time to install the tap/signal for my electronic Greddy oil pressure gauge. It took me about 1.5 hours to finish the job (I already had the gauge installed, with it powered and all).

Since the stock oil pressure galley plug is under the alternator, the first thing to do is remove the alternator. A couple 12mm bolts hold the alternator in place. I actually pulled the alternator all the way out, since it gave me lots of room. I unplugged the single wire off the stock plug, and used a 24mm socket to remove the plug. The Greddy plug is the exact thread/pitch, so it screws right in place (17mm wrench to tighten it down). Ziptied the stock wire and new Greddy wire up nice and neat, and re-install alternator (this was the hardest part, lining up the holes on the drivers side to get the long bolt back thru).

I ran the signal wire along with the boost gauge signal wire (electronic), and thru the same firewall plug under the brake booster. Up thru the dash, and to the gauge. DONE!

I was getting around 6cm/kg2 pressure when started cold (~90psi)...this sound about right to other WRX owners with oil pressure gauge? I think it is. Will report more readings when I get some drive time.

Surprised that the stock oil pressure warning light did not come on? Will it only come on when it is plugged in and gets a low reading? I thought just unplugging it would also trigger the warning light (but am glad it did not).

Any questions, I will try and help out!

Kev

www.forcefed4.com
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Old 09-23-2001, 06:38 PM   #2
joefong
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i installed a blitz oil pressure gauge and i plugged the stock sender back on the other part of the brass T that came with the gauge. did the greddy one not come with one? and the readings are right. i get about 600 kpa which is ~90psi when i cold start too

joe
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Old 09-24-2001, 05:46 PM   #3
fastnoypi
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Does anyone know the "thread/pitch" of the stock oil pressure galley plug? I have a Defi unit that utilizes a sandwich plate between the oil filter but i'd rather keep the oil filter from being located too low.
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Old 09-24-2001, 07:38 PM   #4
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Quote:
I unplugged the single wire off the stock plug, and used a 24mm socket to remove the plug.
24mm or 14mm?
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Old 09-24-2001, 09:00 PM   #5
Force[FED]
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DEFINITELY a 24mm socket. The stock oil pressure plug had a large cross section for the socket. I could not lock the socket on the wrench and get the socket onto the stock plug due to the single male connector on top of the plug. But I got it by just placing the socket onto my wrench, and then onto the plug (without locking socket to wrench).

The Greddy plug only used a 17mm wrench (since the cross section was not as beefy as the stock).

Kev

www.forcefed4.com
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Old 09-24-2001, 09:55 PM   #6
Austin
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Thanks!
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Old 09-25-2001, 01:24 AM   #7
joefong
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yea the stock is 24mm, there is also a special oil pressure plug socket that will get that out, but if u dont have one then an open end 24mm wrench will get it off

joe
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Old 09-25-2001, 03:37 PM   #8
GarySheehan
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Yep, we're getting about 95 psi cold on our Autometer oil pressure gauge.

Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
www.teamSMR.com
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Old 09-25-2001, 03:50 PM   #9
RiftsWRX
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Default oil warning light

Kev:

So to confirm, you've had no problem with the light not coming on when the sender is disconnected and removed?

If that's the case SWEET!!!! I have to do my mechanical autometer and that makes life good, opposed to messing with tee's

Jorge (RiftsWRX)
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Old 09-25-2001, 08:26 PM   #10
Austin
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My Greddy oil pressure (and fuel pressure and egt) guage just came in the mail today. I was gonna install at least the oil pressure, but now it's raining...
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Old 09-25-2001, 09:49 PM   #11
Force[FED]
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Thanks Gary...I noticed I am getting right around 6.75kg/cm2 when cold starting the car...which is close to 95psi. Also surprised that just cruising to work, the thing will run almost 6kg/cm2 (~90psi), just slightly less! At warm idle I get around 25psi of oil pressure, but the gauge is moving around slightly. This is probably why they didn't go with a sensitive gauge, most people don't like ACCURATE gauges.

Jorge, I do NOT have a low oil pressure light on in my car (and I just disconnected the stock setup, didn't tee it off). I was shocked...SteveS (my bro) even admitted he figured the thing would be set up to be 'fail-safe', such that if the sender failed, you would get the light and know something was wrong. But it didn't work this way...kinda scary. If you ask me, the stock dummy light is kinda useless. Hope no one is counting on it.

Kev

www.forcefed4.com
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Old 09-26-2001, 09:48 AM   #12
RiftsWRX
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Thanks Kev!

Did my water and fuel senders last night.

Tonight I have to tear down the alternator and hook up my SS line that goes to my gauge, and do my tranny sender.

Thanks!
Jorge (RiftsWRX)
www.ProjectWRX.com
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Old 09-26-2001, 09:56 AM   #13
Austin
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Jorge - hope you put a write up about installing the fuel sender on your site... I'll be looking for it soon.

It'll be a couple more days until I can get my oil pressure in... My beautiful new greddy oil pressure guage came with an egt temp probe... Don't think I'm good enough to make *that* work!
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Old 09-26-2001, 03:45 PM   #14
aov
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How are you guys hooking up the oil pressure sender. I'm interested in keeping the stock one and have heard of different ways of doing it; use a T at the point under the alternator, or running a SS line to the firewall and placing the T there with both senders.

I also have a water temperature gauge that I am wondering where to hook up.

All help appreciated!

-anders
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Old 09-26-2001, 07:03 PM   #15
Austin
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Jorge - Are the fuel lines standard size, or are they some special metric size? They *look* like regular 1/4inch metal tubing... I'll probably do a compression fitting "T"... where do you say is the easiest location to tap in at?
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Old 09-27-2001, 04:35 AM   #16
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Three questions:

What's the thread/pitch of the oil pressure sender? Is it 1/8" NPT?

Is the stock sender used for anything besides the warning light?

What's a good range (in PSI) for the gauge?

PEACE

OUT

100
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Old 09-27-2001, 12:32 PM   #17
aov
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I believe the threads are 1/8" BSP, which is why you probably want to get the proper adaptor. Here are a couple of links I have found:

Lots of info, but we can't fit the sender to the T in that location:
http://students.washington.edu/markpaco/guages.html

I-club thread on the same subject:
http://i-club.com/forums/showthread.php?threadid=30576

Pretty decent guide (lets you know where to order the adaptor):
http://www.geocities.com/matsut_rpi00/autometer.html

I also found a site that talked about critical failures of brass T fittings, but I can't find the link. Basically they said the best thing to do was run a SS line to the firewall and fit both senders to a T fitting there.

-anders
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Old 09-27-2001, 12:45 PM   #18
RiftsWRX
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anyone found a place (confirmed) here in the states that sells the BSPT adapter?

Jorge (RiftsWRX)
www.ProjectWRX.com
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Old 09-27-2001, 01:17 PM   #19
RiftsWRX
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well I just ordered all the adapters from pegasus racing... I'll just go that route as opposed to messing with everything... Time to pull the alternator tommorow night hehe

Jorge (RiftsWRX)
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Old 09-27-2001, 05:28 PM   #20
redobs
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Quote:
Originally posted by Force[FED]
Thanks Gary...I noticed I am getting right around 6.75kg/cm2 when cold starting the car...which is close to 95psi. Also surprised that just cruising to work, the thing will run almost 6kg/cm2 (~90psi), just slightly less! At warm idle I get around 25psi of oil pressure, but the gauge is moving around slightly. This is probably why they didn't go with a sensitive gauge, most people don't like ACCURATE gauges.

Kev

www.forcefed4.com
Hmmm...I get about 7 kg/cm2. BTW, I have the defi gauge. I used their adapter that goes between the filter and the engine. Any one else use a similar adapter???
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Old 09-28-2001, 10:34 AM   #21
Koua Jones
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I just finished putting my Defi Oil Pressure Gauge on the other day. The pressure when my engine is cold is a little higher than 6kg/cm2 and once it warms up just below 6kg/cm2. At idle it runs about 2kg/cm2. But I think something is wrong because when I am driving slow ~20mph and turning my pressure drops to 0 and the stock oil pressure light comes on. (It never did this before.) I am going to check if my oil filter is on tightly.

redobs - How far did you screw in black plug that came with the Defi unit?
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Old 09-28-2001, 10:46 AM   #22
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Quote:
Originally posted by Koua Jones
redobs - How far did you screw in black plug that came with the Defi unit?
All the way in...it looked like it was leaking a little, so I cranked down on it. Now, it seems to have seized or is just on very tight. I was gonna remove it to put teflon tape on it(cuz I forgot) and I can't get it off. I hope I can get it off, cuz I was gonna hook up oil temp to it, too.
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Old 09-28-2001, 11:14 AM   #23
Koua Jones
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Quote:
Originally posted by redobs


All the way in...it looked like it was leaking a little, so I cranked down on it. Now, it seems to have seized or is just on very tight. I was gonna remove it to put teflon tape on it(cuz I forgot) and I can't get it off. I hope I can get it off, cuz I was gonna hook up oil temp to it, too.
I didn't screw it in all the way or use teflon tape. Do you think this is where my problem lies?
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