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Installing a vacuum gauge

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Old Nov 29, 2005 | 10:22 AM
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Installing a vacuum gauge

A friend of mine has a "economy" gauge on her older Mercedes. I'm assuming it is a vacuum gauge of sort located somewhere in the intake.

If I wanted to install something similar on my V10, where would I put it?

I would also like to do this to determine if there really is any restrictions in the factory intake snorkel. I guess I would need to install one after the filter and as close to the throttle body as possible, right?

What readings would I look for?

Being a vacuum salesman you would think that I would know this...
 
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Old Nov 29, 2005 | 10:28 AM
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Well...looky at what I found.

https://www.ford-trucks.com/forums/s...d.php?t=144651

Still doesn't really help me with determining proper readings, though.

Anyone got input?
 

Last edited by Monsta; Nov 29, 2005 at 10:50 AM.
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Old Nov 29, 2005 | 12:09 PM
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Originally Posted by Monsta
Well...looky at what I found.

https://www.ford-trucks.com/forums/s...d.php?t=144651

Still doesn't really help me with determining proper readings, though.

Anyone got input?
17-22 is the kinda 'normal' range in a typical gas engine. Guys get by with as low as 3 when running big cams with lots of overlap but they have to use a vacuum reservoir if they have power brakes.

There is manifold vacuum, and venturi vacuum. We have EFI so the venturi vacuum doesn't count since we have no carb. But it is vacuum guys discuss sometimes when timing their engines since venturi vacuum is zero at idle (a valve closes the line). You'll want to use manifold vacuum directly off the intake manifold.

I had a couple old Ramblers as a kid with manifold gauges for gas mileage. They said "poor, good & best", but no actual readings.
 

Last edited by ken04; Nov 29, 2005 at 12:19 PM.
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Old Nov 29, 2005 | 02:09 PM
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Monsta,

Be sure and let us know how this one goes. This seems like something cool to have, not to mention gauges that actually move are more fun to have. And the gas gauge doesn't count, that one seems to only one move in one direction, south...

Anyways, I'm curious to see where you tap into it, where you mount the gauge, and also what type of gauge you get (autometer?). Good luck!

 
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Old Nov 29, 2005 | 02:35 PM
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use manifold vacuum .
 
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Old Nov 29, 2005 | 10:24 PM
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"Choosing gears for economy is like getting a Diet Coke with your Whopper Meal..."
And you want an "economy" guage?
 
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Old Nov 30, 2005 | 02:15 AM
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Well. that is what is was called in the Mercedes.

I don't want it for economy. I want to see if the intake really IS restrictive or not.

I want to tap into the snorkel (see Gale Bank's thoughts on performance intakes et al.) for starters. However, I do not know what numbers I'd be looking at.

If I keep it, THEN I'll tap into the manifold and leave it there...just for fun.

I think I'm gonna get the dash panel guage "pod". I'd like to have extra gauges down where the rest of the instruments are. Tranny temp first, the second one may well end up being this vacuum gauge because like 2000silverbullet says "gauges that actually move are more fun to have."
 
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