The Vacuum Gauge

[Tommy V]

Do u know all the ways a vacuum guage can help u when diagnosing a engine problem?Vacuum is a veryimportant paparameter to watch plus can also help tell what kind of state ur engine is in internally,if u know how to read it.

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[GT Pony]

Do u know all the ways a vacuum guage can help u when diagnosing a engine problem?Vacuum is a veryimportant paparameter to watch plus can also help tell what kind of state ur engine is in internally,if u know how to read it.

True, and it swings around a lot which is cool.

I watch the virtual vacuum gauge sometimes to see what the idle vacuum is, and what it goes way down to when coming down from high RPM with the throttle fully closed. I'm seeing about 20 in-Hg at idle and 25 in-Hg on a closed throttle high RPM deceleration. Looks pretty normal IMO.

Another fun one to watch is the Air/Fuel gauge.

 

[arghx7]

Do u know all the ways a vacuum guage can help u when diagnosing a engine problem?Vacuum is a veryimportant paparameter to watch plus can also help tell what kind of state ur engine is in internally,if u know how to read it.

Yes but on these newer engines they're harder to read and interpret. You actually run less vacuum during normal driving (not idle or overrun decel) on modern engines. That's the result of TiVCT operating to improve fuel economy. It reduces manifold vacuum. It changes the valve timing in such a way that the throttle has to be cracked open more to achieve a given amount of torque.

That's the least technical way of describing it.

 

[benanderson89]

What I meant was that for me the Mustang is purely about fun, it does not get driven for economy in any way whatsoever.

My main commuter car is a 2013 Jetta Diesel that, with its tune, gets deep into the 50's for mpg, and is absolutely lethargic to drive. It's the Mustangs carbon offset.


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Or, you know, you're driving to work or to the shops and you don't want to be wasting fuel for something so mundane. Save the fuel for the times when you wont have a few 6-packs or your briefcase in the boot.

 

[Tommy V]

Yes but on these newer engines they're harder to read and interpret. You actually run vacuum. acuum during normal driving (not idle or overrun decel) on modern engines. That's the result of TiVCT operating to improve fuel economy. It reduces manifold vacuum. It changes the valve timing in such a way that the throttle has to be cracked open more to achieve a given amount of torque.

That's the least technical way of describing it.

Yes u are correct but vaccum at idle can tell a whole lot.However is getting harder with the tivct to read vaccum.

 

[GigaHz]

Will the ecoboost gauge swap in place of the GT PP gauge.

 

[GT Pony]

Will the ecoboost gauge swap in place of the GT PP gauge.

I'd think it would. Both cars probably use the same manifold pressure sensor, so the EB gauge would work if that's the case.

 

[Anthony]

No. The get would probably use a 1bar sensor and the ecoboost uses a 2 bar, but I'm told it gets its info from the can bus. I'm working on it

 

[GordieBobfish]

Obviously there are diagnosis benefits to engine vacuum but I still stand that it isn't critical enough in a brand new car to have made it a standalone gauge when they could have easily programmed into the other "gauges" that are in the drivers display.

They only put it there because it moves a lot, I'd be willing to bet on that.


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[Clink]

Obviously there are diagnosis benefits to engine vacuum but I still stand that it isn't critical enough in a brand new car to have made it a standalone gauge when they could have easily programmed into the other "gauges" that are in the drivers display.

They only put it there because it moves a lot, I'd be willing to bet on that.


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I'd agree, something cool for passengers to see when you rev.

 

[Autocratic]

What size are the gauges? If they are a standard 52 or 60mm why not just fit whatever you want. Some white faced Defi gauges would look really good. Also Stack makes dual readout gauges so you could potentially have four gauges in space of two.

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