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Old 05-22-2014, 09:09 PM   #1
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Weird Oil Pressure Issue

New to the forum! New to 5.0s! Thanks in advance!

So normal driving, oil pressure is great. It is very steady around 60 psi. But under heavy acceleration, the oil pressure slowly drops. It does not drop to zero but goes pretty low to about I would say 20 psi. As soon as you take your foot out of it, it goes right back to normal. Factory gauge.

Here are the particulars on the car: 89 LX 5speed. I just bought this car a couple of weeks ago. It looks like an aftermarket block but its hard to tell. Was told it is a 306 with forged pistons at minimum. TFS heads, X303, original cobra intake with 70mm throttle body, Vortech V1, Aftercooler, FMU, T-Rex booster pump, MSD 6AL BTM, BBK Long tubes, off road h-pipe, mac 2.5 cat back. When I bought it, the car was way over the previous guys head. It had a wicked vacuum leak that was the plenum gasket and it ran like total crap so I never pushed it hard. That is till today after I fixed all that.

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Old 05-23-2014, 02:41 PM   #2
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Factory gauge is doodoo.

Unfortunately a good aftermarket one would dispel any concerns.
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1989 Sonic Blue LX Coupe, 349 ci, TW heads, TFS Track Heat Intake, 75mm Accufab TB, 80mm ProM, 30 lb. inj, TKO, 3.73, 31 spline w/ TruTrac, MAC 1-5/8" LT headers w/ H pipe, Flowmaster, electric fan Moates QH
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Old 05-28-2014, 05:52 PM   #3
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Factory gauge? There's your problem. The factory gauge is not accurate in any way shape or form whatsoever. You need a good aftermarket gauge to have any idea what your actual PSI is.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.

Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.
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