Explain the vacuum boost gauge please

[Anthony]

Read post above

Yea. The second time I read it proves you don't know what your talking about.

The ecoboost motor has vacuum too. The gauges are NOT the same in the ecoboost and gt.

It's not putting "turbo" in Anything, the turbo compresses air and puts it in the cylinder.

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[Evolvd]

You're reading manifold pressure. When it's in vacuum the cylinders are pulling the air in, under boost the turbo is putting positive pressure into the manifold. The more time you stay in vacuum the better your gas mileage will be.

 

[Vile_the_Bastage]

You're reading manifold pressure. When it's in vacuum the cylinders are pulling the air in, under boost the turbo is putting positive pressure into the manifold. The more time you stay in vacuum the better your gas mileage will be.

BOOM! What he said! Plus what I said!

/thread

 

[Grintch]

The boost gauge is how much turbo is being put in the ecoboost. The vacuum gauge is for how much vacuum is in the v8 engine. They don't change the gauge so that on the production line, it is less parts to sort/change therefore there are less mistakes made

The V8 gauge is all vacuum, there is no boost side.

And it's a useless gauge. I don't give a rats ass what my vacuum is, now oil temperature would have been a useful gauge.

And if they can't figure out how to install the right gauge (which apparently they do, as they are different), we're screwed with all the other EB & GT differences.

 

[Vile_the_Bastage]

I can't live without a Wideband gauge (in conjunction with a boost gauge) in a boosted car. Especially after I've been screwing with it (mods and tune). You can tell how shit a tune is real fast when you are in full boost and your AFR's be like 13!!! KNOCK KNOCK MOTHA@$&*!!!

 

[dgc333]

The boost gauge is how much turbo is being put in the ecoboost. The vacuum gauge is for how much vacuum is in the v8 engine. They don't change the gauge so that on the production line, it is less parts to sort/change therefore there are less mistakes made

I have owned turbo charged engines continiously since 1985 and all but the Focus ST had a gauge that read manifold pressure above and below atmospheric pressure. I am quite sure the only reason the ST didn't is the gauges on top of the dash are tiny and you wouldn't be able to read it if read vacuum too.

 

[Evolvd]

I can live without many gauges, however oil pressure is the most important. If you know what your standard oil temp is suppose to be you can tell if you low pressure (temp goes up). Vacuum is useless on a non-boosted engine unless you're tuning fuel delivery but just like boosted engines, once you set it there shouldn't be any need to continue to stare at it.

 

[Juben]

Vacuum can be useful on a boosted engine. You can tell a lot about an engine's health by the amount of vacuum it has, if there's a vacuum leak, etc.

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[Grintch]

I don't think anyone is arguing against the vacuum/boost gauge on the EB. It's the vacuum gauge on the GT that is about the most useless gauge they could have given us.

 

[Greg15]

My wife asked me what that Vacuum gauge is in my GT. I told here it's measuring the pressure or lack of pressure in the intake manifold due to the suction caused by the pistons. She replied, "Why do you care about that..."

 

[anotherneon]

My wife asked me what that Vacuum gauge is in my GT. I told here it's measuring the pressure or lack of pressure in the intake manifold due to the suction caused by the pistons. She replied, "Why do you care about that..."

because people like gauges thart move....seems like its doing something. Same reason why kids would run narrowbands in their cars.

 

[VNMOUS1]

Its stupid that it comes with the PP GT. Last time I checked, the GT isnt supercharged / turbocharged lol

It's convenient for us because we put blowers on cars

Bj

 

[cbrtrx]

Actually a vacumm gauge is very useful if you understand it, even on an n/a engine. It can tell quite a bit about the engine and also possible intake restrictions.

 

[DRKHR5]

At idle and at light throttle his engine will still be in vacuum as well. When your turbo hits it's boost threshold (when your motors exhaust gasses have spun it up enough to make useable power) the needle will swing right and your gauge will read positive boost. Vacuum isn't limited to V8's, all motors will sometimes be in this condition.

OP that needle can be fairly handy for troubleshooting issues with your motor and or turbo. For example, if you are sitting at idle and your Vac is pegged to the left, not moving, you could have a leak somewhere. The same is true if you mash the gas and your car is not hitting its boost target (have no idea what that is on the Eco 'Stang). Under normal conditions, you would honestly just ignore that gauge until something felt wrong.

**Edit**

The gauge is still useful for troubleshooting N/A motors as well, and will definitely come in handy should you choose to supercharge. As an added bonus, it's factory so it won't look tacked on like you will find with a few turbo imports.

When you said that if the gauge is pegged left at idle... there "could" be a problem... did you mean on the turbo 4? Because... in my GT PP.. it is pegged left all the time at idle. I will verify this next time in the car... but if its not pegged left.. its barely registering any vacuum at idle. ***** EDIT: My vacuum gauge is sitting at about 20 or 22 when at idle... almost all the way left.. but definitely not pegged. ******

Im just as confused about this gauge as the OP...

because it got really confusing through everyone's responses on here and somehow now I believe people are saying that the vacuum gauge helps indicate Boost if you decide to turbo or supercharge your mustang?!?!? How is this? Vacuum isn't spelt B-O-O-S-T or even P-S-I....

im even more confused after reading this thread just because there didn't seem to be a simple answer as to what the vacuum gauge is useful for Stock... not considering possible future power adders.

Just My opinion after reading all of this. :headbonk:

 

[Juben]

A vacuum gauge is useful on a naturally aspirated (N/A) car (GT) because it can show a little bit about the general health of your engine, if you have vacuum leaks, etc. For instance, let's say a healthy Coyote should have 22-24 vacuum on a healthy engine, but yours only has 10-12. You'd notice this and would know that something is possibly wrong.

Also, a vacuum gauge doesn't read boost. So if you installed a turbo or supercharger while retaining the factory vacuum gauge, it'd just go to 0 and stay there while the engine was under boost.

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