Boost Pressure

[Big Blue]

I don't do apple so can't say. It is not by same author. I'm doubtful though.

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[dondonbabyraptor]

Can someone explain to me barometer pressure in relation to our Ranger and how to tell if something is not working correctly if barometer pressure is "so and so". Please

 

[arbjosh]

Bluetooth OBD2 reader + OB2AA + torque pro.

Not going to lie, it was kind of a PITA to setup in my opinion. I just installed it so lets see how clunky it is in the long run. I'll be removing the decimal readings. On the plus side, the response is spot on. No lag between the bluetooth OBD and headunit.

 

[y2krtaf]

Great thread,I added something else that is a Nice add on.

Should be nice to see what kind of boost it’s making under different loads and different situations.

Used the parts and pieces mentioned,and a glow shift pod mount,and was up and working in about an hour.

Very simple and straihgt forward.

 

[micl9]

Great thread,I added something else that is a Nice add on.

Should be nice to see what kind of boost it’s making under different loads and different situations.

Used the parts and pieces mentioned,and a glow shift pod mount,and was up and working in about an hour.

Very simple and straihgt forward.

I like this gauge better! But the other one looks good too!

 

[y2krtaf]

I like this gauge better! But the other one looks good too!

Living in Az,knowing the air temp out of the vents is nice.
Although the A/C in these is good,it rarely blows colder than low 50’s out of the vents..
‘My Hellcat,and Jeep,blow low 40’s,with the Hellcat blowing right at 40.

May have a buddy check it just because.

 

[Big Blue]

Just find an used android phone to use. It doesn't need an active cell account to work.

 

[yamahaSHO]

Can someone explain to me barometer pressure in relation to our Ranger and how to tell if something is not working correctly if barometer pressure is "so and so". Please

Generally, barometric pressure will be used in compensation tables for boost, VE, etc. As you lose baro pressure, your turbo (particularly the small ones found on an OEM like this) will start running out of its efficiency island, so you may see boost go down at really high altitudes (same with excessive intake temps). You generally have comps for target boost as well as wastegate duty cycle. These can be manipulated based on the turbo size you run. If you put a fairly large turbo, you can sometimes command more boost at altitude, or even the same boost to keep the power losses down.

As for VE, pressure at the end of the exhaust goes down, so I generally see engines lean out at high altitudes (generally when going into the mountains... I live at 8k feet) if baro comp tables are zero'd out.

 

[dondonbabyraptor]

Generally, barometric pressure will be used in compensation tables for boost, VE, etc. As you lose baro pressure, your turbo (particularly the small ones found on an OEM like this) will start running out of its efficiency island, so you may see boost go down at really high altitudes (same with excessive intake temps). You generally have comps for target boost as well as wastegate duty cycle. These can be manipulated based on the turbo size you run. If you put a fairly large turbo, you can sometimes command more boost at altitude, or even the same boost to keep the power losses down.

As for VE, pressure at the end of the exhaust goes down, so I generally see engines lean out at high altitudes (generally when going into the mountains... I live at 8k feet) if baro comp tables are zero'd out.

Very detailed. Thank you Jason, will look into some of this terminology.

 

[TORQUERULES]

23 psi here btw.

 

[Dgc333]

Can someone explain to me barometer pressure in relation to our Ranger and how to tell if something is not working correctly if barometer pressure is "so and so". Please

Barometric pressure is the pressure that is applied to everyone and everything on the surface of the earth by the atmosphere that surrounds the earth. Your altitude in relation to sea level will will vary the barometric pressure as well weather conditions. Barometric pressure is in reference to no pressure at all as in outer space. The weather guy talks about it in "Hg (inches of Mercury) so you see numbers like 30 +/- "Hg it can be expressed in psi absolute (psia) or typically around 14.7 psia.

Here in North America we talk about boost in pounds per square inch or psi and manifold vacuum in "Hg. Typical Boost gauges will display both manifold vacuum as well as boost pressure. On the boost side it will be graduated in psi and on the vacuum side "Hg. When the engine is not running the gauge will read 0 or in relation to barometric pressure 14.7 psia. If you have 10 psi of boost that would be 24.7 psia. On the vacuum side 15"Hg would be approximately 7.3 psia.

It has been mentioned in this thread that the engine produces less boost in cooler weather. The reason for this is the 2.3 Ecoboost control strategy is for the engine to meet torque targets. In cooler denser air it does not require as much boost to meet the torque target.

 

[yamahaSHO]

Barometric pressure is the pressure that is applied to everyone and everything on the surface of the earth by the atmosphere that surrounds the earth. Your altitude in relation to sea level will will vary the barometric pressure as well weather conditions. Barometric pressure is in reference to no pressure at all as in outer space. The weather guy talks about it in "Hg (inches of Mercury) so you see numbers like 30 +/- "Hg it can be expressed in psi absolute (psia) or typically around 14.7 psia.

Here in North America we talk about boost in pounds per square inch or psi and manifold vacuum in "Hg. Typical Boost gauges will display both manifold vacuum as well as boost pressure. On the boost side it will be graduated in psi and on the vacuum side "Hg. When the engine is not running the gauge will read 0 or in relation to barometric pressure 14.7 psia. If you have 10 psi of boost that would be 24.7 psia. On the vacuum side 15"Hg would be approximately 7.3 psia.

14.7 PSI is roughly what you'd see at 'sea level', barring any high or low pressure front. Where I live at 8k feet above sea level, I generally see 10-11 PSI (12's when I drive into Denver) of atmospheric pressure (vacuum readings of -7PSI/14.x inHg on one of my cars, where near sea level, it reads -10 to -11 PSI/20-22 inHg and -3.8 PSI on one of my cammed vehicles). Manifold pressure of 25 PSI over atmospheric, here, is more like 35-36 PSI, absolute.

Power loss is real up here. You lose power, run out of compressor efficiency, and have less air to remove heat. If you can keep a vehicle cool up here, you can easily keep it cool at lower altitudes.

It has been mentioned in this thread that the engine produces less boost in cooler weather. The reason for this is the 2.3 Ecoboost control strategy is for the engine to meet torque targets. In cooler denser air it does not require as much boost to meet the torque target.

I don't have any Ford software available as the Ford's I generally tune are a bit older and we move to stand-alone ECU's, (this being one of them: ), but here some tables from a Subaru:


Boost Target vs Barometric Pressure:

Wastegate Duty Cycle vs Barometric pressure (this is a stock map, you don't need negative values in to make less boost at altitude, it will automatically do that, so my tables generally look different):

And like mentioned above, some vehicles will use torque request... They all implement them a little different... From the same Subaru map, this is one of three different throttle maps that a user can select on the fly:

2 of 3:

You can also set a hard limit between the 3 selections, so it's like having 3 maps on-the-fly:

Which this correlates into how much boost you'll run:

Then here is a VW with lots of torque tables :

I'll start using Ranger tables when I receive my Ranger and get some software. I wish Cobb supported it as they support other EcoBoost stuff.

 

[Smprfiguy]

Here is some light reading for you it should just about cover all your questions.

 

[dondonbabyraptor]

Barometric pressure is the pressure that is applied to everyone and everything on the surface of the earth by the atmosphere that surrounds the earth. Your altitude in relation to sea level will will vary the barometric pressure as well weather conditions. Barometric pressure is in reference to no pressure at all as in outer space. The weather guy talks about it in "Hg (inches of Mercury) so you see numbers like 30 +/- "Hg it can be expressed in psi absolute (psia) or typically around 14.7 psia.

Here in North America we talk about boost in pounds per square inch or psi and manifold vacuum in "Hg. Typical Boost gauges will display both manifold vacuum as well as boost pressure. On the boost side it will be graduated in psi and on the vacuum side "Hg. When the engine is not running the gauge will read 0 or in relation to barometric pressure 14.7 psia. If you have 10 psi of boost that would be 24.7 psia. On the vacuum side 15"Hg would be approximately 7.3 psia.

It has been mentioned in this thread that the engine produces less boost in cooler weather. The reason for this is the 2.3 Ecoboost control strategy is for the engine to meet torque targets. In cooler denser air it does not require as much boost to meet the torque target.

Appreciate the very detailed response. Hello my me figure out more about this world, thank you Dave

 

[Dr3wDrop]

This looks soooo good!

I am going to reach out to P3 first to see if they plan on making an air vent boost gauge. If they have no intentions, I will certainly get in touch with HN Customs for one of these.

Based on your pictures, looks like a lot of the cutting under the vent was for that blue air tubing. I may go with an electric gauge this one to minimize my butchering skills.

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