Oil Pressure with Modified Supras

[coldtires]

Hello,

I have a '21 Supra 3.0 with an upgraded turbo, PI, flex fuel tune, etc. I wanted to know what all pressures you guys were normally seeing in your car at idle, cruising, and WOT. I see 100+ PSI / 7-8 bar at WOT. With 3-4 bar at idle and up to 5 while cruising.

I might have a faulty oil pump from what it seems in these forums and other BMW forums as my year was affected with the plastic internals. Other symptom is the obvious unable to measure oil level. But before I plan on replacing it, I wanted to know what everyone else was seeing.

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[razorlab]

Oil pressure is tunable so you first need to see if your tuner did that. Logging target in addition to actual will give you better insight.

 

[coldtires]

Oil pressure is tunable so you first need to see if your tuner did that. Logging target in addition to actual will give you better insight.

Yeah, I also discussed it with the tuner and the same exact topic. He says he had left it untouched.

 

[coldtires]

Oil pressure is tunable so you first need to see if your tuner did that. Logging target in addition to actual will give you better insight.

Also wanted to ask, anyway to log target using Bimmerlink or MHD+?

 

[razorlab]

Yeah, I also discussed it with the tuner and the same exact topic. He says he had left it untouched.

Okay then it's a bit easier. OEM oil pressure targets at operating temp are:

Idle: 36 psi
Cruise: 36-64psi (2000-4000rpm)
WOT: 64-80psi(4000-7000rpm)

This is absolute, so subtract ambient pressure for gauge. (depends on what your logger is set to)

Also wanted to ask, anyway to log target using Bimmerlink or MHD+?

I don't think MHD has target, unfortunately, but you can basically map it out via the table screenshot I posted above.

 

[coldtires]

Okay then it's a bit easier. OEM oil pressure targets at operating temp are:

Idle: 36 psi
Cruise: 36-64psi (2000-4000rpm)
WOT: 64-80psi(4000-7000rpm)

This is absolute, so subtract ambient pressure for gauge. (depends on what your logger is set to)

I don't think MHD has target, unfortunately, but you can basically map it out via the table screenshot I posted above.

Might have to dumb it down for me sorry lol. Could you clarify subtract ambient pressure for gauge?

As for the logger, which one should I use?

 

[razorlab]

Might have to dumb it down for me sorry lol. Could you clarify subtract ambient pressure for gauge?

As for the logger, which one should I use?

So when you log, you can set the logger to use absolute pressure (not taking into account the ambient pressure) or gauge/relative (taking into account ambient pressure)

Example:

At idle, the DME is targeting 36psi absolute. If you are at sea level and logging in gauge/relative pressure, it would be subtracting 14.7psi so you would see 36-14.7= 21.3psi

If your logger isn't set to gauge/relative pressure, you would see 36psi.

 

[coldtires]

Gotcha, and could you just search up the ambient pressure in your area instead of the logger? When you do get the value, what insight would it give?

Does Bimmerlink have a way to check gauge/relative?

 

[coldtires]

For reference too, I am about 3000 above sea level.

 

[razorlab]

Gotcha, and could you just search up the ambient pressure in your area instead of the logger? When you do get the value, what insight would it give?

Does Bimmerlink have a way to check gauge/relative?

Here you go, in Bimmerlink:

 

[coldtires]

Thank you. I realized I've already been logging with the actual oil pressure value offset-corrected (based on ambient pressure) and it's been reading 0 the entire time. Does that indicate another issue?

 

[razorlab]

Thank you. I realized I've already been logging with the actual oil pressure value offset-corrected (based on ambient pressure) and it's been reading 0 the entire time. Does that indicate another issue?

It might just be a non-working data channel in Bimmerlink. If it was truly zero, the rod bearings would be toast.

 

[coldtires]

Lmao, for sure thanks. I'll see if I can log it later. As for now, what info does the gauge/relative value give?

 

[razorlab]

Lmao, for sure thanks. I'll see if I can log it later. As for now, what info does the gauge/relative value give?

The "Ambient Pressure" logging item I circled above will show you what your local ambient pressure is. At 3,000 feet it probably will be around 13.2 psi

 

[Z4m40i]

It might just be a non-working data channel in Bimmerlink. If it was truly zero, the rod bearings would be toast.

Yeah I get some weird stuff in bm3 as well using the RAM channel.

this thread was very helpful, as my tuner had to adjust oil pressure for the VANOS exhaust target, and I didn’t have a baseline.

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