GameboyRMH
GameboyRMH GRM+ Memberand MegaDork
1/24/18 9:05 a.m.

I'm looking to upgrade the oil pressure monitoring on my 4AGE from a plain ol' idiot light to an analog sensor that will feed the ECU (where it can be logged) which will then trigger the idiot light (which is better at getting the driver's attention than a gauge) based on a minimum pressure vs. RPM graph. This will also let me set a minimum oil pressure for startup like Aston-Martin puts on their cars.

I figure it would be best to add oil temperature sensing in the same sensor if possible, replacing my current system of getting out and pointing an infrared temp gun at the oil cooler after runs.

It seems that very few such sensors are made and all the ones I've found are madly expensive. I'll consider spending up to $150 for such a sensor. The thread on the block is 1/8-28 BSPT which is commonly used on Toyota and Nissan engines so it would be a bonus if it had that fitting.

This one is almost perfect, except it would need an adapter and the price is "you have to ask:"

http://www.kasensors.com/sites/default/files/downloads/ASMC_Series_Miniature_Pressure_%26_Temperature_Transducer_Datasheet_ASMC_1115.pdf

Jcamper
Jcamper Reader
1/24/18 10:17 a.m.

Not exactly what you are looking for, but I am looking real hard at a set of these gauges for my car. http://www.longacreracing.com/products.aspx?itemid=1730&prodid=7405&pagetitle=AccuTech™+SMi™+Oil+Pressure+Gauge 

Also going to add a retina burning idiot light for water pressure. That is the one that cost me a head gasket at the end of an enduro in the heat. I broke the fan belt and didn’t realize it until too late. Idiot lights were too dim to convince me I had a problem, and it shoved just enough water out to uncover the water temp sensor. Turned a perfectly reliable race engine into a season off. Jcamper

GameboyRMH
GameboyRMH GRM+ Memberand MegaDork
1/24/18 10:24 a.m.
Jcamper said:

Also going to add a retina burning idiot light for water pressure. That is the one that cost me a head gasket at the end of an enduro in the heat. I broke the fan belt and didn’t realize it until too late.

I set up a temperature-dependent rev limiter on my engine for this. It only allows the normal limit (8200rpm) between 150F and 212F. Above that, a 5krpm limiter cuts in, which is sure to get my attention. A blew a head gasket and possibly contributed to the melting of a piston just over a year ago because I didn't notice an overheat.

Like this, but I've tightened it down since then:

I last lowered the upper limit to 212F after I found that the engine only got up to 203F in a 15-minute lapping session.

GameboyRMH
GameboyRMH GRM+ Memberand MegaDork
1/25/18 7:47 a.m.

Bump, nothing? If there are none, I'll just order this:

https://www.summitracing.com/int/parts/vdo-360081/overview/

It's compact which is good for fitting on this engine, and calibration charts are available for it.

ChasH
ChasH New Reader
1/25/18 9:39 a.m.

 VDO makes a double pole sender. One pole is a switch for a light the other pole is for a gauge.

GameboyRMH
GameboyRMH GRM+ Memberand MegaDork
1/25/18 9:48 a.m.

Don't need a light sender, that will be controlled by the ECU.

wspohn
wspohn Dork
1/25/18 11:22 a.m.

Speedhut does a double gauge with oil temp and fuel pressure, but I don't see why you couldn't use the fuel pressure for oil pressure.  You can T in for a warning light of course.

 

https://www.speedhut.com/gauge/GR338-DUAL-FOILT-02/1/Dual-Gauge---Fuel-psi,-Oil-Temp

3_1_7
3_1_7 New Reader
2/3/20 12:51 a.m.

Old thread I know, but curious if you ever found a cheap-ish sensor that worked out and seemed to reliable? Thanks in advance...

Paul_VR6
Paul_VR6 Dork
2/3/20 12:36 p.m.

Motion Raceworks just released an M12x1.5 temp/pressure sensor for the LS that isn't too spendy.

Mangocats
Mangocats
12/13/20 4:25 p.m.

Not cheap-ish at all, unless you consider it insurance against a blown engine:

https://www.amazon.com/Oil-Temp-Pressure-Sensor-4921475/dp/B07HY3BF9J

 

 

pirate
pirate HalfDork
12/13/20 4:53 p.m.
 

Also going to add a retina burning idiot light for water pressure. That is the one that cost me a head gasket at the end of an enduro in the heat. I broke the fan belt and didn’t realize it until too late. Idiot lights were too dim to convince me I had a problem, and it shoved just enough water out to uncover the water temp sensor. Turned a perfectly reliable race engine into a season off. Jcamper

For a warning light I used a Aqua Signal LED bait well light. They come in white, blue and red and I think yellow. They require 7/8" hole and are 1 1/2" in diameter. I use a red one for oil pressure in a open car and it is very visible even during daylight hours. I have a gauge but agree a light will get your attention. They sell on Amazon or boating supply companies.

 

 

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