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Old 08-22-2010, 11:17 PM   #1
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Default Cold idle oil pressure? Hot idle oil pressure? What's yours?

I am seeing 55 cold, 10 hot.

I am running an 03 with an aftermarket sensor in the stock location. BE OPGs.

You?

Last edited by Faeflora; 08-23-2010 at 09:53 AM.
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Old 08-23-2010, 12:22 AM   #2
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10 hot, holy bawls????.... I'm 50-60 cold 20-25 hot using 5w-30 that's on my Autometer gauge not stock fake gauge.
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Old 08-23-2010, 12:55 AM   #3
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60-70 cold, 30-35 hot on stock gauge with 5w-30.
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Old 08-23-2010, 12:57 AM   #4
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10w-30, 45ish cold, 22-25ish hot. 10 is REALLY low.
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Old 08-23-2010, 01:05 AM   #5
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With a completely cold engine, I peg the stock oil pressure gauge with anything over 2000rpm. At operating temperature (160*), I see 30psi in 5th, which is about 3500rpm. I THINK. You have major problems if you're seeing 10psi at anytime beyond a 100rpm idle.
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Old 08-23-2010, 02:20 AM   #6
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Quote:
Originally Posted by curly View Post
With a completely cold engine, I peg the stock oil pressure gauge with anything over 2000rpm.
Isn't pegging it also a bad thing? Mine goes up til about 75 under the same conditions.
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Old 08-23-2010, 09:21 AM   #7
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I'm probably about 12psi hot idle, 65psi cold idle per stock gauge. I can also peg the stock gauge/relief valve on a cold engine at anything above an idle. Hot, and high RPM, I probably hit 55/60 PSI.

Dont the 95/later idiot OPGs switch from "off" to "on" at 8psi?

Probably has a lot to do with Teeing a 4AN feed line directly from the sensor port.

Last edited by fooger03; 08-23-2010 at 09:35 AM.
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Old 08-23-2010, 09:42 AM   #8
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On three different engines I've had 10-12psi at idle when hot (according to an autometer electric gauge), one of which was completely rebuilt with a new oil pump. Built engine ran Rotella T, other 2 were 10w30.
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Old 08-23-2010, 09:50 AM   #9
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Quote:
Originally Posted by curly View Post
You have major problems if you're seeing 10psi at anytime beyond a 100rpm idle.
Hmm. This is why I started the thread.

I have an aftermarket PLX sensor right where the factory one used to be. The gauge is digital, so the readout is accurate but I'm not sure if the readings themselves are correct.

Where would be a good (and easy) place to measure oil pressure elsewhere- with a handheld gauge?
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Old 08-23-2010, 10:05 AM   #10
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Quote:
Originally Posted by RotorNutFD3S View Post
On three different engines I've had 10-12psi at idle when hot (according to an autometer electric gauge), one of which was completely rebuilt with a new oil pump. Built engine ran Rotella T, other 2 were 10w30.
ditto
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Old 08-23-2010, 10:45 AM   #11
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Quote:
Originally Posted by RotorNutFD3S View Post
On three different engines I've had 10-12psi at idle when hot (according to an autometer electric gauge), one of which was completely rebuilt with a new oil pump. Built engine ran Rotella T, other 2 were 10w30.
Same oil pressure in the NA as the NB?
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Old 08-23-2010, 11:10 AM   #12
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Quote:
Originally Posted by faeflora View Post
Same oil pressure in the NA as the NB?
Yup.
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Old 08-23-2010, 01:19 PM   #13
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If you could please note where you guys are taking it from and if there are any T's on the line.

I see warm cruise around 40... idle as low as 15 hot.

Location: T'ed at stock location with OEM gauge and turbo feed. AN line brings with sensor mounted on firewall.
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Old 08-23-2010, 02:00 PM   #14
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I wouldn't think 10psi for hot oil at idle would be an issue. That's plenty of pressure to pump hot oil through the engine and feed the bearings.
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Old 08-23-2010, 03:12 PM   #15
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Quote:
Originally Posted by faeflora View Post
I am seeing 55 cold, 10 hot.

I am running an 03 with an aftermarket sensor in the stock location. BE OPGs.

You?
Pretty much the same. Aftermarket sensor, stock location off a Tee.
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Old 08-23-2010, 03:15 PM   #16
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Hehe, I'm seeing 40psi warm idle in the GTX with a Mazdaspeed HV oil pump.

I think it was usually about 20psi warm idle with the miata oem OPG though.
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Old 08-23-2010, 04:39 PM   #17
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mine drops to 10 psi on idle dips. normally around 15-20. definitely within spec at 3000 rpm though.
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Old 08-23-2010, 06:40 PM   #18
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Quote:
Originally Posted by y8s View Post
mine drops to 10 psi on idle dips. normally around 15-20. definitely within spec at 3000 rpm though.
What is spec?

When I put it in gear and am above 1000 rpm it's generally above 20. Hot cruise is around 35.
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Old 08-24-2010, 12:35 PM   #19
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So I retro'd the 1.6 gauge and sender into my car, so the needle might be off....

Peg the gauge when cold....
Just over, just under 60psi mark when hot @ 4K rpm
Idle is normally around 30psi... with the really hot temps, it's been just under in stop and go @ idle....

'95 workshop manual says:
Quote:
Oil Pressure:
98-196 kPa (15-28 psi) @ 1,000 rpm

295-392 kPa (43-56 psi) @ 3,000 rpm
Dave,
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