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Old 03-30-2006, 01:00 PM   #1
bluestone
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Member#: 36583
Join Date: May 2003
Chapter/Region: SCIC
Location: Irvine, CA
Vehicle:
2004 WRX sedan
Aspen White

Default Oil temperature gauge vs Oil pressure, also cheap D-Gauges

Trying to decide between these two... I am inclined towards the temp because all I want to know is if my car is warmed up. I read before there is some relation between temp & pressure so either gauge will tell you that. The pressure costs a little more, and supposedly will let you know whether your engine is about to crap out, but then supposedly by then it is too late anyway.

Any convincing argument whether I should get the pressure for the extra 25 bucks? Also if anyone in the area wants to combine shipping with me to get one off ebay, here's the seller he has a bunch of D-Gauges both white and black face:

http://stores.ebay.com/Panda-Racing-Pro
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Old 03-30-2006, 01:28 PM   #2
mpower22
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Chapter/Region: MAIC
Vehicle:
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08 z51C6 (growing mullet)

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meh I have both pressure and temp...and egt...and boost.....all defi d gauges....decent match to the speedo and tack....pretty cheap...work fine for me....happy with them....
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Old 03-30-2006, 01:38 PM   #3
ButtDyno
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Location: Why do they always say the Evo
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is the "dark side"
06 Evo #7 STU, 03 IS300

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You can tell when the engine is warmed up using the pressure gauge. Unless you're tracking the car or otherwise abusing it at high speeds for long periods of time (in which case you really care about peak temps) that should be all you need.

john
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Old 03-30-2006, 03:12 PM   #4
AJ711
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Location: Singletracks
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98 GM67 + 03 SG6
2 whls > 4 whls

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Agreed with John. General driving, oil pressure will be a better choice. Yes, you do have a dumby light that will give you a second at most of warning, but the gauge will give an overall picture of things. Pressure will drop to 20psi when things are warmed up properly, and increase past 100psi on cold starts when driving past 3000RPM. Not to mention it can show you if you have a leak or not. I'm currently seeing between 15-20psi at idle ---> I have a leak, as evident from the stains in the driveway.

Oil temp will be necessary for prolonged stress on the engine. Track days, long periods at higher RPMs, or just general desire to know (my case) are areas that the oil temp will be desired.

Or, just get a sandwich adapter and buy both gauges. You can never have too many gauges.

<---has 7
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Old 03-30-2006, 03:34 PM   #5
bluestone
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Aspen White

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Cool, so seems like oil pressure shows more of what's going on. I guess 30 min highway commutes or 3-4 hr roadtrips don't count as prolonged stress? I really only need one gauge right now, have an empty spot on the autometer-style dash gauge bezel.
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Old 03-30-2006, 04:48 PM   #6
Gonz
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Quote:
Originally Posted by bluestone
Cool, so seems like oil pressure shows more of what's going on. I guess 30 min highway commutes or 3-4 hr roadtrips don't count as prolonged stress? I really only need one gauge right now, have an empty spot on the autometer-style dash gauge bezel.
oil pressure gauge only gives an indication of temp in the sense that you can tell when the oil becomes less viscous and the idle pressure drops from 100 PSi down to 25 psi or so.

HOwever, the oil temp could be at 100, 250, 300 degrees and you wouldn't know it from oil pressure. Also, when I had both gauges, i noticed that the oil pressure at idle drops to 'normal' well before the oil temp actually reaches 100 F, warmed up.

I think oil temp is more useful in that if you see the temp creeping up, you can stop and check things out. Have you lost oil level ?

I once did, through a bad gasket on the drain plug. I could see the temp getting slowly higher than normal. It gives you chance to look for a problem.

If you see your oil pressure has bottomed out, then what are you going to do ? Rebuild the motor ?
If your car has hundreds of thousands of miles on it, then oil pressure might serve as a good indiator of how long till your going to need a rebuild or to let you know that you should switch to a heavier oil.

G
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Old 03-30-2006, 04:49 PM   #7
dunk
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It's worth the money to go for the oil pressure gauge.

Duncan
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Old 04-04-2006, 12:50 PM   #8
Jyik40
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Join Date: Nov 2003
Chapter/Region: Tri-State
Location: Greenburgh, NY
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2005 Spec-V
Sapphire Blue

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I actually just bought the D-Gauges from Panda Pro. You can call them up and get them to combine the shipping from you. I had to get those since the prices were so cheap (relatively). I think they are discontinued, so if you want them you should get them while they are still available.

I bought two temperature gauges and the oil pressure gauge.

Mpower: How big is the Defi oil pressure sending unit? Is it tiny like the Greddy/Omori type senders?

Jay
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