Jeezus

iTrader: (4)

Say you have a gauge... Lets say fuel gauge. Fuel gets to a set limit of being too low, and the fuel light comes on. I want to run something like this, but for oil pressure. If oil pressure is too low, a light and/or buzzer goes on/off.

Lets say, lowest oil is at idle, and 17psi. I set a buzzer/light to go off when oil is at 10psi or less.

How would one go about doing this? I know this is a general question, so I am not expecting a specific answer. I will dig around some wiring diagrams and parts tomorrow, but wanted to get a head start tonight.

blackdeath647

iTrader: (2)

its gonna be kinda hard, since oil has lots of different densities and it also varies with weather, and when your car warms up...i'm not saying its not possible, but good luck, i haven't heard of this before but who knows it just may be out there .

Jeezus

iTrader: (4)

No problem

When the car is cold and warming up, it see's higher oil pressure being that the oil is thicker when cold.

blackdeath647

iTrader: (2)

that's what i mean tho, as the oil warms up it becomes less dense so it expands and therefore your gauge will read higher, then as it gets cold it'll read less, gas gauge is not really a problem because it takes very extreme temperatures to cause a huge effect on its density, but it don't take much for oil, perhaps if you could somehow have a gauge (or 2) that would read the level when its hot, and read it when its cold, then take the average, its the only way i can think of...as far as expansion goes, i know it's more drastic than gas, as to how much more idk, maybe some of the big brainiacs from the forum can kick in some ideas.

i guess a way to measure the expansion rate would be to go outside in the morning before first start of the day and check the oil level, then after arriving to your destination (when car is nice and warm to running T) check the oil level again....how to tell a gadget to do this is beyond me haha

nobodymv

iTrader: (3)

Maybe I am misunderstanding the issue, because my car has WHAT I BELIEVE to be a low oil pressure buzzer that goes off if the pressure is too low....and I am pretty sure it is stock and not after-market because an idiot light turns on as well. Is this buzzer for something else? (I am pretty sure the low coolant has a buzzer as well that sounds similar)

blackdeath647

iTrader: (2)

now i'm just plain confused hahaha

i guess what i'm saying is that accuracy would be off, because when you start your car your pressure will be less it would seem, so lets say its very cold outside and oil is very thick pressure will be low because its hard moving all that oil around so lets say the "buzzer" comes on until the car warms up and oil is flowing faster so pressure rises to "normal" and the buzzer stops, so..which one would be the one to trust there?....i think i'm gonna sleep this one off and hopefully i can be of more help tomorrow/later on today/later lol

bad 83

iTrader: (3)

There is an oil level sensor in the oil pan that activates a light and buzzer. This is not effected by oil pressure. There are aftermarket digital gauges that can be set to give a warning.

Re-Speed.com

iTrader: (3)

blackdeath647,

The pressure will be higher until the oil warms - Then the pressure will drop.

Stu,

You will want an adjustable sender so you can set the warning level. This kit has the sender and light but you can just get the sender.

Get one with 1/8th NPT threads. Then you can use it in the engine block or an aftermarket pedestal.

Very common part on road race cars. I had one on my first IT car that fed a 2" round trailer light on the dash. You could not miss it when it came on

http://www.racerpartswholesale.com/p..._Light_Systems


-billy

Jeezus

iTrader: (4)

Thanks Billy! I already use both of the outputs on the pedestal. I guess I can pull the stock sensor on th rear iron (iirc) and stick this in there instead, since I don't use it anyways. How do I go about adjusting it? I assume it would be somewhat of a screw... just plug it up and let the car idle, then turn the adjustment down until the light goes off. Just thinking aloud.

gsl-se addict

iTrader: (3)

Stu: Just get a T and connect your oil pressure gauge and the warning light/buzzer to the Re-speed block. You are just measuring pressure, so multiple connections to the same spot will not change anything.

If you wanted to build something to do this, it would be very easy. You would just need a pressure switch (one that switches at say 10psi) and a light and/or buzzer. The light/buzzer would come on if the key was 'ON', but not running, but that shouldn't be a big deal.

The other option would be to use the stock sender. You would need a voltage regulator (few cents), a few resistors, and a comparator circuit (simple/cheap). When the resistance of the sender went above/below a certain value, the comparator would trigger the buzzer/light accordingly. This would/could be adjustable as to when it comes on.

Re-Speed.com

iTrader: (3)

Yes, it has a screw to adjust. The rear iron is 1/8th BSP so you will need a 1/8th female to 1/8th BSP male adapter.

That is how I had it setup. Let the engine warm up (hot oil) then adjust at idle.
Worked great for a number of years.

The only time I saw the light come on was turn 7 at road Atlanta before I baffled the oil pan. It would just blip and go off in a split second.

-billy

rotordave

iTrader: (1)

This seems to have been made more complex than it needs to be. There are aftermarket gauges, like the SPA gauges, that allow you to set an alarm level to display a light or sound an alarm. The sender is only reporting the analog value, its logic inside the gauge that determines if an alarm should be raised.

Jeezus

iTrader: (4)

Less gauges = more sleeper. I have an A pillar dual gauge pod, so that atleast lets people know whats up. The next few gauges will go on the left and right side of the lower dash so no one will see them. I will move the oil temp and pressure gauges there, since they will be "less important" than the boost and wideband gauge.

I am only wanting the low oil pressure light because I will be going above and beyond what is needed to run what I would like to run.