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Old 09-30-2005, 03:44 PM   #1
916dave
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Default Mech vs. Elec Gauges

I'm contemplating getting some Omori boost/egt gauges. Is there any real difference between the mechanical vs. the electronic gauges?
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Old 09-30-2005, 04:03 PM   #2
waktasz
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For electrical gauges you probably have to buy an additional sending unit and it involves more wiring, but is probably more accurate.
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Old 09-30-2005, 04:57 PM   #3
916dave
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mmm.... so for simplicity's sake, go with the mech? I mean, the mech gauge is still probably more accurate than the stock?
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Old 09-30-2005, 04:59 PM   #4
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I bought the omori electronics for better accuracy- they arent hard to hook up at all, not a big deal, you just have to splice a few other wires.
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Old 09-30-2005, 05:07 PM   #5
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Did you have to get an additional sending unit also? If so what does something like that cost?
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Old 09-30-2005, 05:22 PM   #6
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If you already have the Subaru Boost, would there be any problem getting the Omori mechanical boost then just hooking it up to the hose/wires for the Suby one?

logic tells me no, just making sure
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Old 09-30-2005, 05:24 PM   #7
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I don't see why there would be a problem with doing it that way.
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Old 10-01-2005, 04:47 PM   #8
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Quote:
Originally Posted by PhatheadWRX
If you already have the Subaru Boost, would there be any problem getting the Omori mechanical boost then just hooking it up to the hose/wires for the Suby one?

logic tells me no, just making sure
it wouldnt be a problem, but the omori gauge is 52mm and the stock subaru gauge is 40mm..so the stock pod had to be modified with a dremel or something to make it fit.

if you buy the electronic gauges they come with all the sending units needed, but they do cost a little bit more than the electronic gauges. Check out www.j-spectuning.com for good gauges slection and prices.
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Old 10-01-2005, 05:06 PM   #9
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Omori makes a 45mm gauge which will fit in the Subaru 42mm pod. I replaced my OEM Lamco gauge in the 3-gauge pod with an Omori, it fit with some dremeling of the bezel. If you have the column mounted gauge the Omori can be squeezed into the pod.
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Old 10-02-2005, 12:41 AM   #10
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i was thinking about the difference between electronic and mechanical gauges and i figured that electronic gauges start out with a mechanical unit, then it converts it to an electronic signal that goes to the gauge...so when you think about it, the reading that the gauge displays is originally from a mechanical unit...so is the electronic gauge really more accurate? it might have a more accurate mechanical unit, but other than that i don't know why it would be...the needle will maybe move a little different too...am i way off on my theory?
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Old 10-02-2005, 01:11 AM   #11
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All electrical gauges use an electric meter movement. The signal that moves the meter is provided by a sensor that measures the parameter in question- a pressure sensor for boost/vacuum, thermistors for oil or coolant temp, etc.
Mechanical gauges do not use electric meters and have mechanisms inside that are acted upon directly by whatever is being measured. Boost gauges usually contain Bourdon tube movements inside, which mechanically compare the ambient atmospheric pressure to manifold pressure.
In the case of boost gauges, both types are accurate as long as they are decent quality meters. The electrical ones have no moving parts besides the actual meter movement, so their response time is faster but this is not a huge issue.
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Old 10-02-2005, 01:45 AM   #12
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Quote:
Originally Posted by dubluv17
i was thinking about the difference between electronic and mechanical gauges and i figured that electronic gauges start out with a mechanical unit, then it converts it to an electronic signal that goes to the gauge...so when you think about it, the reading that the gauge displays is originally from a mechanical unit...so is the electronic gauge really more accurate?
Unfortunately, I don't think there is a universal answer to that question. One has superior accuracy & precision if the accumulated "error" that occurs as the actual signal is being passed along, converted, and contaminated with "noise" is smaller compared to the other. Could we say that one system definitely accumulates less error than the other?

For example, poor wiring/circuitry in an electronic gauge could offset the ideal supply voltage to the pressure sender in an electronic gauge such that it becomes a terrible system. The piezo element of an electronic gauge's pressure sender could be of a poor quality with significant hysteresis. In a mechanical gauge, the bourdon tube, or the gearing that follows could be poorly calibrated. A system made of high quality parts could have been improperly calibrated. In the end, it's the sum of the errors that matters.

I know that for industrial use, sensors are available in different ratings (in terms of accuracy, precision, response time, and possibly other relevant metrics). The "better" ones are usually more expensive, but that is not always the case. Afaik, aftermarket automotive gauges do not publish their quality metrics (e.g. precision, accuracy, etc.) per established industrial standards. Until then, it is up to the consumer to make their own conclusions.

As a "driver's feedback" tool, imho any gauge that reads reasonably consistently, and returns to zero when it should, is probably adequate. Anything beyond that is probably personal preference.


my 2 cents

Edit: Mulder beat me to it.
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