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 Post subject: Vacuum/Boost gauge
PostPosted: Mon Sep 14, 2015 5:43 am 
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Just got a 91 Firefly Turbo, there's a hose coming off the manifold, through the firewall, about ten feet of clear hose coiled up, and a broken gauge laying on the passenger side floor. I assume this is a boost/vacuum gauge, is it factory? If so, what's it supposed to look like and where does it mount? Anyone got a picture?

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 Post subject: Re: Vacuum/Boost gauge
PostPosted: Mon Sep 14, 2015 6:17 am 
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a.k.a Bum head
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There was no factory boost gauge. Which means you can mount one anywhere you like. :lol:

I usually took out the ash tray and mounted two up in that spot.


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 Post subject: Re: Vacuum/Boost gauge
PostPosted: Mon Sep 14, 2015 4:30 pm 
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Location: columbus, ohio
yep, woodie, you have a clean slate with a boost gauge.

i built a pillar mounted 2 position housing. that has seen many permutations of gauges over the years but i recall starting with a cyberdyne electronic vacuum/ boost gauge and a narrow band afr gauge in my first turbo3/vert swap.
Image

the boost gauge is very informative. the narrow band gauge takes some interpretation and only displays a general indication of rich or lean. sometimes my narrow band gauge would strobe. =)

i sort of like the old school vdo single pods. i have 3 of them mounted on the top of the instrument cluster bezel, the ones i give the highest priorities.
Image

i also needed more gauges for my experimental car so i installed one on the dash. my supervisory computer for the megasquirt gives me 8 more gauges, virtual displays but still useful.

since i'm an old guy i have been installing gauges in my hot rods for a long time. i prefer the newer type electronic gauges, they keep the obnoxious stuff under the hood. i have been sprayed with hot, pressurized engine oil a few times. i've also had a few dash fires from ammeters gone wild. :twisted:

there are a number of good electronic gauges on the market, some of them very inexpensive. i have always liked cyberdyne as their faces black out when power is off. i use the innovate mtx wide band afr set and that has come down in price. a narrow band gauge is about 25% of the cost of a wide band gauge so it makes sense to do the throw down for the better gauge. :wink:

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 Post subject: Re: Vacuum/Boost gauge
PostPosted: Tue Sep 15, 2015 5:38 am 
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t3 ragtop wrote:
Image


Holy crap, you like to know what's going on, don't you? :lol: Too much information for me, I'm trying to stay near stock. Now I'm puzzled, cause the bit where this hooks into the intake manifold sure looks factory.

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 Post subject: Re: Vacuum/Boost gauge
PostPosted: Tue Sep 15, 2015 4:34 pm 
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for the manifold connection to connect a vacuum/ boost gauge it's best to use the hole in the center on the back side of the manifold. you want to use a location that will give you an integrated pressure signal.

i have always had to remove a steel plug from the turbo3 intake manifold and replace it with a 1/8" mpt barbed hose fitting (hose bib.) the threads in the manifold aren't really npt pipe type, it has the same odd threading as the oil ports. still, the 1/8" npt tapered fitting will tighten up okay. i use pipe thread paste there as tape has a bad habit of covering across the fitting's end and blocking flow.

the cyberdyne vacuum/ boost gauge i run uses a pressure transducer that i mounted on the firewall. that keeps the hose length to a minimum. the wiring is a 3 conductor twisted, shielded, gray instrumentation cable. at the gauge there are 3 more separate and larger wire diameter wires for +12vdc, ground, and accessory lighting (dimmer signal.)

since you seem to already have a pressure signal hose running into the cockpit all you will need is lighting for a mechanical gauge.

more unsolicited advice - use a gas filter in that hose. the vapors from the intake manifold contain trace hydrocarbons that will eat a pressure transducer or diaphragm in a boost gauge. the run of the mill metro uses one in front of the map sensor which is easily re-purposed for a boost gauge. :wink:

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1991 Blue Geo Metro Convertible highly modified 1.0L Turbo3 5 spd. - 1991 Red Geo Metro Convertible customized with a Twincam 5 spd.

My Turbo3 Project
My Cardomain Page -Ol' Blue
My YouTube Channel
My Photo Gallery
SAAB Sonett II


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 Post subject: Re: Vacuum/Boost gauge
PostPosted: Wed Sep 16, 2015 5:27 am 
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Not trying to jump you're post and I know I'm risking looking stupid but would I use a standard small fuel filter for the gauge line or is there a special filter? I'm sure there must be a special filter but thought I better check.
If it's a special filter what would I call it to locate one?
Thanks Edd

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 Post subject: Re: Vacuum/Boost gauge
PostPosted: Wed Sep 16, 2015 6:26 am 
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No problem FE, I'm probably going to do this and would like to know the same thing.

I consider no advice unsolicited, T3. I'd like to know everything in that big head of yours.

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91 Pontiac Firefly Turbo
10 Suzuki Kizashi


Alcohol, Tobacco, and Firearms
Should be the name of a convenience store, not a government agency


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 Post subject: Re: Vacuum/Boost gauge
PostPosted: Wed Sep 16, 2015 8:27 am 
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The filter you'll want will have activated carbon/charcoal in it to filter out the HC fumes. A fuel filter wouldn't do what you need.


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