Oil pressure Switch and Sender

[flaatr]

So I'm cleaning up some more wiring and I noticed a difference between my car and others I've seen... First I only have the oil pressure sender and no switch and second, to the best of my knowledge, the sender is in the wrong port.

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Based on the reducer in port 3 of my spare flange the sender could go here or in port 1.

My car has plugs in both port 2 and 3 and the gauge in port 1... like this.

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BTW, It's a 1990 1G GSX

What is the correct configuration?
-Raffi

 

[19Eclipse90]

1 is for the oil pressure switch (dummy light).

Neither 2 nor 3 is actually for the sender (gauge), but 2 is closer to the original position than 3. The original configuration has the gauge unit in the position shown below.

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[flaatr]

Neither the one on the car or my spare have this feature...

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Not sure if there were multiple casting revisions...

-Raffi

 

[19Eclipse90]

Interesting. I have an idea for why that is (different castings), but I'll check and try to verify it before I mention it here.

If you want it as close to original as possible, use an adapter to place it the sender in #2. As I stated before, #2 is closer to the original position than #3 as #2 taps into the same oil gallery as the original position. #3 is after the oil filter whereas #1, #2 and the original position are all before.

Could you use #3? Sure - I wouldn't expect an enormous pressure drop through the oil filter to have a huge effect on what the gauge will read. After all, the stock gauge isn't numerically telling you the pressure, it's simply giving you an idea of where it stands.

Hopefully that sorts things out for you.

 

[flaatr]

If I am correct, and I don't know that I am, my port 1 & 2 are both pre filter and are on the same common point as your port, circled in red... the one I don't have.

Can you verify this? Does your port go directly to the unfiltered area under the filter as my port 1 & 2?

-Raffi

 

[19Eclipse90]

The port circled in red goes to the same gallery that #2 taps into, absolutely no question. I'll have to run over my notes later this evening, but I'm pretty confident that #1 and #2 share the same gallery for this housing (on water-cooled housings, this is a separate gallery which is where I'm getting mixed up), which would mean that #1 also shares the gallery as the red circled port.

Some other bits of the oil path through the '90 OFH are sorted out here: http://www.dsmtuners.com/forums/turbo-system-tech/409331-6-bolt-swap-90-ofh-turbo-feed.html.

 

[flaatr]

OK... if your red circled port is in fact the same oil, with no restrictions, as my Port 1 & 2 then I could leave the pressure switch in Port 1 and run my remote line to my pressure sender off port 2 leaving port 3 terminated with a plug...

If it is what it is...

Waiting to hear back.

-Raffi

The only question that remains is where is the oil switch mounted on a 1990 1G with this plate if the sender was in Port 1... seems like something is still missing.

 

[19Eclipse90]

If it is what it is...

Verified -- it is.

OK... if your red circled port is in fact the same oil, with no restrictions, as my Port 1 & 2 then I could leave the pressure switch in Port 1 and run my remote line to my pressure sender off port 2 leaving port 3 terminated with a plug...

You should have no issues doing that.

The only question that remains is where is the oil switch mounted on a 1990 1G with this plate if the sender was in Port 1... seems like something is still missing.

My theory didn't pan out. I'm just as lost on where this housing came from because all 1G cars came with the gauge and the dummy light. I will eventually check a couple other sources for everyone's general knowledge. Until then (assuming I can actually check these other sources), the best I can come up with is that I don't believe it to be a USDM DSM housing. The only picture I could find through a quick search was the fourth picture in this post: GSRSOL - 4GTuner - Page 2.

 

[flaatr]

it is odd... I have one on my car and the one I have been photographing that I pulled myself off a 90 gsx in a local yard. 2 for 2. Strange.

No matter... Since all there ports, my 1 and 2 and your circled port, are all sharing a common chamber the pressure will be the same. I'm not going to replace the flange if I don't have to.

Thanks for all the help and if you uncover any more of the mystery please let me know.

-Raffi

One last question... what kind of wrench do I need to remove the oil pressure switch without scaring the outside of it. It has a very weird shape.

Chanel lock pliers or vise grips are not what I would consider an option.

-Raffi

 

[19Eclipse90]

Unfortunately, I've only ever used channel locks. Maybe someone else can offer a different solution.

Still having rotten luck finding anything like your housings.

 

[flaatr]

Back from the dead... Which of the ports for the external cooler is the output port and which one is the return (input)?

-Raffi

 

[19Eclipse90]

The port on the left in the pictures above (or the one towards the radiator) is the input to the oil cooler. You can see this easily in post #2 -- that port runs straight from the oil filter.

So, oil runs through the oil filter to the left port where it either bypasses the cooler all together by means of the oil cooler bypass valve or it runs through the cooler and back into the right side where it flows to the rest of the engine.

If you're asking about the ports on the cooler itself, it hardly matters. It's a heat exchanger one way or the other. If you mount the cooler with the ports on the side rather than the top or the bottom, I would suggest running the input (left port - from the oil filter) on the housing to the top-most cooler port and the return (right port - from the oil cooler) to the bottom-most cooler port.

 

[empie1]

Out of curiosity, what product are you guys using on the threads of the pressure sender? Mine has always dripped from there no matter what I do.

 

[flaatr]

Is this what you are saying?

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-Raffi

 

[19Eclipse90]

You bet.

 

[flaatr]

Awesome!!!
Thanks

-Raffi