oil pressure and sender questions

[MA70Snowman]

Did a search, found some of the info I was looking for but still had a couple of questions

Finished my rebuild. on my car get everything going and primed the engine. (cranked without spark or fuel going to engine) .. I cranked and cranked and never saw my oil pressure gauge move. Now I know I have oil, because I found a couple of leaks in my -10 AN lines going to my oil T-stat. I did shim the oil pump during rebuild. about 7mms. so here's the questions.

1. What oil pressure (psi) should I expect to see?
2. Whats to low/to much psi?
3. How can I verify if my sender is bad?
4. If sender is bad, can I replace it w/ an aftermarket one going to an aftermarket gauge? (I'm curious about this, cause I do recall from my searches IJ i think, mentioned it controlled Idle speed?)
4b. whats the thread size on the stock sender?


Thanks guys. Kinda shooting from this hip on these questions.

 

[berniek]

When I did my JDM 7MGTE build, I bought a new oil pressure sender, among many other items. It still read 20 PSI low at idle, and lower yet at high speed. The way I knew was by a trick I've been doing for some years:

Take a new oil filter, and a center punch. Make a hole in the bottom of the filter with the punch, so no chips are formed. Use the body of the punch to open the hole to 1/4", scrape the paint off around the hole, and solder in a piece of 1/4" copper tubing. Attach a hose and gauge with tight hose clamps. You will then read the pressure from the pump.

When cold, the pressure can approach 80-100 PSI despite the oil cooler bypass. When hot, the idle pressure is about 20-25 PSI. But in my case, the dash gauge with the new sender reads next to zero.

One consideration: You will be reading pressure upstream of the filter element. When hot, it will not mean much, so hot idle oil pressure reading will be pretty accurate. When cold, there is a bypass valve inside the filter which opens at a differential pressure of perhaps 6-8 PSI.

Hope this helps. You can keep the modified filter on hand to check actual oil pressure at any time.

BernieK
'91T, non-targa, refreshed JDM, Walbro, Lex, 550cc ND injectors, 57 trim turbo at 17 PSI (at 3000 pipe), '98 wheels and engine mounts (strong!), Lipp, modified stock FPR, Treadstone IC, hardpipes, Cometic, ARP, Random Tech 3" single cat downpipe, HKS LE-T16 exhaust, Cometic, ARP, Exedy organic clutch (street use), Cr-Mo light flywheel, Raptor BOV (recirculated), deflashed valve bowls, exhaust helicoils, tower strut.

Did a search, found some of the info I was looking for but still had a couple of questions

Finished my rebuild. on my car get everything going and primed the engine. (cranked without spark or fuel going to engine) .. I cranked and cranked and never saw my oil pressure gauge move. Now I know I have oil, because I found a couple of leaks in my -10 AN lines going to my oil T-stat. I did shim the oil pump during rebuild. about 7mms. so here's the questions.

1. What oil pressure (psi) should I expect to see?
2. Whats to low/to much psi?
3. How can I verify if my sender is bad?
4. If sender is bad, can I replace it w/ an aftermarket one going to an aftermarket gauge? (I'm curious about this, cause I do recall from my searches IJ i think, mentioned it controlled Idle speed?)
4b. whats the thread size on the stock sender?


Thanks guys. Kinda shooting from this hip on these questions.

 

[MA70Snowman]

okay after reading your post, I guess I should clarify some things

1. I have a remote Oil filter, so no longer have the oil bypass.
2. My current oil route is
Block -> Filter -> oil T-stat -> oil cooler -> back to T-stat -> block All lines are 1/2" NPT and -10 AN fittings.

My question regarding the gauge, is that I would like to install an electronic Gauge and replace the OEM one. but my hange up being do I need the stock sensor for the ECU? still would like to know the Threading on the stock sender.

I like the idea about the oil filter gauge, I will do that to get a baseline reading. thanks.

 

[isnms]

thread = 1/8 bspt

 

[MA70Snowman]

thread = 1/8 bspt

Thanks