EFI University

ecuflasher · Joined: 24 May 2008 Posts: 27 Location: EU

There's a number of fluid pressure sensors listed on Motec's website. Which is most suitable to use as a fuel and also oil pressure sensor? I'm thinking the 250 PSI (1723 kPa) Honeywell MLH pressure sensor should be alright. Any advice?

APEX Speed Technology · Joined: 13 Nov 2004 Posts: 726 Location: Venice, CA

We always use the 150psi for oil and fuel.
_________________
Neel Vasavada
Apex Speed Technology
2947 S. Sepulveda Blvd
Los Angeles, CA 90064
310-314-2005
www.apexspeedtech.com

Martiens · Posted: Sun Mar 15, 2009 11:03 pm Post subject:

I use honeywell 250psi for both.

Dont fit directly on engine block to minimise vibration on sensor and also do not fit upright if its in wet environment to keep water from accumulating over time inside the connector on the sensor. This will cause corrosion which in turn causes headaches.

ecuflasher · Joined: 24 May 2008 Posts: 27 Location: EU

They only list a 100PSI or 250PSI honeywell fluid sensor these days and I can't use the 100PSI cause my oil pressure is higher than that. Looks like the 250PSI is my only option. Is the resolution of the Honeywell 250PSI sensor good? It will withstand both petrol and engine oil?

Many thanks Smile

Martiens · Posted: Mon Mar 16, 2009 1:51 pm Post subject:

Yes its resolution is suffiecient and it does handle regular fuels (gasoline/petrol/oil)

For nitro and other corrosive applications Motec sells a different sensor.

M

ecuflasher · Joined: 24 May 2008 Posts: 27 Location: EU

Thanks Martiens! Btw, I bought a Bosch LSU4.2 sensor from TechEdge Australia instead of Motec but after reading Motec's datasheet on their LSU4.2 sensor, it seems that they processed the sensor inhouse and came out with a calibration number that's to be used in setting up the sensor in the Motec software. Can I just do a free air calibration and get the same results?

s15dxb · Joined: 13 Dec 2005 Posts: 94 Location: Dubai

You can use a multimeter to check the resister ohm in the sensor. and that would be the calibration number.

Martiens · Posted: Tue Mar 17, 2009 9:47 am Post subject:

Do a free air cal, its the same.

Be sure that its not in a "dirty" environment like a workshop or dynoroom.

other choice would be to measure the Calibration resistor in the connector and multiply the Ohms by 10 to get cal NR. It think Cal nr and free air might be different if done at altitude

M