mazda/nissan

iTrader: (2)

my oil pressure moves with my tach, once warmed up it sits near 0 at idle, and may go up to about 35 or 40 at WOT

cardriverx

iTrader: (12)

mazda/nissan

iTrader: (2)

i think i'm going to get another oil pressure gauge and mount it on my gauge bezel because i've heard the OEM ones can crap out... may also be my sending unit though

urgaynknowit

iTrader: (5)

mines at 80 cold, and sits 30-60 warm

elesjuan

iTrader: (11)

I've seen it before but can't remember.. Which wideband display is that?

kenzo42

iTrader: (6)

Where in the video (time,secs) do you see or hear knock. I don't have an ear or eye for this.

johndoe

iTrader: (5)

it's the bouncing of the oil pressure gauge needle

Braineack

iTrader: (62)

how can you see knock on a gauge the surely isn't working

m2cupcar

iTrader: (5)

or: image how far that thing would be bouncing IF it were working

cardriverx

iTrader: (12)

just FYI, I dont hear any knock at all, so if it is knock it is subtle



the wideband display is a $10 volt meter off ebay wired into one of the LC-1 outputs.


The gauge moves ALOT more when the car is cold...

m2cupcar

iTrader: (5)

it could be trash in the sender (random flickering) - I had that BUT is it repeatable at the same rpm/load? IOW doesn't only flicker under load at 6k vs. 6k w/o load? That'd be an indicator.

cardriverx

iTrader: (12)

where is the best place to get a reading for oil pressure?

m2cupcar

iTrader: (5)

for comparison? I would do it at that same spot, "apples to apples". Doesn't take much to unscrew the OE sender.

magnamx-5

iTrader: (7)

The oe spot is the ideal location to measure pressure. And Scot i felt it better to be cautius in my advice as i did see the guage move abit and given the range it showed us there, i figured it was a significant variation to advise him off. Not that he would go around thinking he was 1000000000% safe and be hammering the **** out of his pistons with silent knock.

Savington

iTrader: (31)

Magna, I didn't see the gauge wiggle enough to indicate detonation. The OP is very low, though. My '94 is around 85 at cold idle, down to around 30 at normal warm idle, to 25 at hot idle. WOT oil pressure is never lower than 45-50.

cardriverx

iTrader: (12)

imma put a real gauge on it. What are the size/pitch of the threads for the stock location?

magnamx-5

iTrader: (7)

1/8th bpt