whats the best over rated sensor to use (RIFE SENSOR BLOCK)?

Just a quick question about the best sensor to use. We have a rife sensor block that was donated (non profit raffle car building ) that has a 3 bar map intake temp sensor and a 300 psi and 150 psi sensor in the block.

the engine is a super charged 4.67 lt over bored straight 6 amc engine and its running a MPFI intake modified from 4.0 engine.

the question is since I have to choose between running a 300 psi sensor for oil or a 300 psi sensor for fuel ( and the other for oil ) is it better to have too much sensor for oil or too much sensor for fuel ?

thank you for your input.

What is the voltage resolution of your ECU or data logger? You will have reduced resolution with the larger range sensor. I would suggest if your ECU is making fueling changes based on fuel pressure, then you would want to use the 150 psi sensor for fuel pressure since that would have the best resolution. Most likely your oil pressure will just be used for alarms or safeties, and you could deal with a loss of resolution.

If your input system has 10-bit resolution for a 5V input (so 1024 unique values or 5V / 1024 = 4.8mV / bit). A 150psi sensor would typically have a 4V range (0.5V - 4.5V), so 150 / 4 = 37 psi / volt = multiply this by 0.0048 and you get .183 psi/ bit. For a 300psi sensor this would be double or .366 psi.

Now if your ECU or logger had a 12bit resolution, then you could have 4 times the resolution 0.046 psi the 150psi sensor (and 0.092 psi for the 300 psi sensor).

+1 for David's comments, the 150 psi for fuel and the 300 for oil so you have improved accuracy on the sensor where it's more critical.

Thank you guys so much, I had imagined this myself but was not super sure since the guys at rife didn’t seem to think it would matter all that much.

it’s a Holley HP ecu which allows for me to fill 16 cells total. When calibrating the sensors manually I figured I could use every cell up to the point where it was unlikely to ever have pressure that high and then start skipping cells and then several cells. This looks like this in the HP calibration software for the 300 psi sensor ( Holley will only allow me to input 250 psi Max for fuel ) so this is what the 300 psi sensor looks like setup for fuel. ( not ideal )

also this is what 150 psi looks like for oil.

the next question is in the interest of resolution should I setup the 150 psi sensor with this weird offset filling every cell untill I go beyond normal fuel rail pressure and then start skipping cells or is this actually a bad idea? ( the every cell full then skip some idea not the 150 psi idea which we already established is a good idea. )

There should be an interpolate function (so it will fill in the values in between)., so you only have to enter the values at 0.5V (0PSI), and 4.5v (150 or 300 psi). Or it's probably OK, to only put those two values in the table -- you might ask Holley about that just to be sure.

If they only allow a maximum value of 250 psi, then this will be 3.83 volts, so enter 3.83 volts and 250 psi.