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Old 08-05-2002, 04:28 PM   #1
gypsymoth
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04 Silver WRX STi

Default what is the purpose of gauge pack?

I am just wondering what is the guage pack (manifold vacuum, voltage, and oil temperature) used for?

How will seeing the vacuum, voltage, and oil temperature help me as a driver, mechanic, or anything else?

Is it just dead weight?

Chieh
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Old 08-05-2002, 11:01 PM   #2
z&cobb
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Default Re: what is the purpose of gauge pack?

Quote:
Originally posted by gypsymoth
I am just wondering what is the guage pack (manifold vacuum, voltage, and oil temperature) used for?

How will seeing the vacuum, voltage, and oil temperature help me as a driver, mechanic, or anything else?

Is it just dead weight?

Chieh
--
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I'm tempted to say dead weight in an RS. Knowing vacuum could help you drive for maximum gas mileage, and a voltmeter used to be standard on cars because it reveals problems before the idiot light goes on. The oil temperature is nice to know on a modified WRX, but it's not too important on an RS.
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Old 08-06-2002, 01:55 PM   #3
gypsymoth
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04 Silver WRX STi

Default Re: Re: what is the purpose of gauge pack?

Quote:
Originally posted by z&cobb


I'm tempted to say dead weight in an RS. Knowing vacuum could help you drive for maximum gas mileage, and a voltmeter used to be standard on cars because it reveals problems before the idiot light goes on. The oil temperature is nice to know on a modified WRX, but it's not too important on an RS.
Thanks. I know about how to use the voltmeter to check the battery, but that's pretty much all I know.

How would knowing vacuum help maximize gas mileage? The more vacuum the less gas used? Or the other way around?

Chieh
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Old 08-06-2002, 10:50 PM   #4
tmat3
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More vacuum you have, the healthier the engine is. The engine is a big vacuum machine. If there is a leak, it creates less vacuum and fuel efficiency will go down. The ideal vacuum reading at idle is around 600 - 650 mmHg.

Oil temp is very useful if you do a lot of hard driving (i.e. race, AutoX, high RPM driving...) If the oil temp goes up too high, the engine can die. Also, you can easily tell if the engine is fully warmed up or not. Mine (Autometer temp gauge) reads around 180F on highway, and 210F in city, and never exceeds 220 even in 100F degree weather.
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Old 08-07-2002, 02:39 PM   #5
gypsymoth
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Default

Thanks. That was very informative.

How easy is it to install the gauge packs? Does it take a lot of work like drilling into different components? Or does it just plug in to various places, like the ECU?

Chieh
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Old 08-07-2002, 02:41 PM   #6
gypsymoth
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Quote:
Originally posted by tmat3
More vacuum you have, the healthier the engine is. The engine is a big vacuum machine. If there is a leak, it creates less vacuum and fuel efficiency will go down. The ideal vacuum reading at idle is around 600 - 650 mmHg.
Oh yah . . . would there be more or less vacuum at higher RPM?

Chieh
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Old 08-07-2002, 04:38 PM   #7
tmat3
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at high RPM, if you're stepping on the gas, you would get less vacuum because the throttle body is open. BUt, if you are coasting, then you would generally get more vacuum than at 600RPM idle.

As for installation, it's not very complicated. It takes time to install though. Vacuum gauge needs to be tapped at fuel pressure regulator vacuum line, volt gauge needs to be tapped into a + line, and oil temp requires a new engine oil drain plug that is provided with the gauge pack.

I chose not to get Subaru gauge pack that costs $500, and decided to get Autometer gauges (A/F, Oil Pressure., Oil Temp, Water Temp, and EGT).
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