2025 Hurricane S/O Boost data.

[jmr]

Using a app on my phone for my 3.0 S/O monitoring manifold pressure boost and other sensors.
It appears the 22psi of boost that is advertised is accurate btw this was done using 93 octane gas.



I posted a video of 4 runs with the Rebel using 93 octane premium.
The video is at 20% speed to make it easier to view. Unfortunately there isn't a graph of the sensors just the numeric values.

 

[v8440]

Interesting. I also notice that timing advance is listed as -2.5 degrees. I wonder if that's 2.5 degrees pulled out from target advance because of detected knock or if it's actually 2.5 degrees after top dead center...

 

[n8zcc]

Does the manifold PSI reading include the atmospheric pressure? 37 - 22 = 15 or 1 bar.

How can the manifold pressure be higher than the boost unless atmospheric pressure is included?

Typically pressure readings are represented as above atmospheric pressure but sometimes this isn't always the case. Thinking about the difference in atmospheric pressure drops as altitude increases, the computer has to calculate fueling, spark timing, and air density. I wish tools that provide data would be more specific about the base of the data presented. Maybe this is general knowledge and I'm out of tune.

Does the engine have a sensor for boost pressure or has the sensor been replaced with a computer calculation like so many other sensors?

 

[MT755]

Interesting. I also notice that timing advance is listed as -2.5 degrees. I wonder if that's 2.5 degrees pulled out from target advance because of detected knock or if it's actually 2.5 degrees after top dead center...

The SO can use 87 octane but the hp and torque are measured with 89 octane. Maybe the -2.5 degrees is pulled because he is running 87?

 

[v8440]

The SO can use 87 octane but the hp and torque are measured with 89 octane. Maybe the -2.5 degrees is pulled because he is running 87?

That could well be, which would correspond with what I said about 2.5 degrees retarded from target advance. By target advance, I mean what the computer will set timing to at that moment in the absence of any knock.

 

[v8440]

Does the manifold PSI reading include the atmospheric pressure? 37 - 22 = 15 or 1 bar.

How can the manifold pressure be higher than the boost unless atmospheric pressure is included?

Typically pressure readings are represented as above atmospheric pressure but sometimes this isn't always the case. Thinking about the difference in atmospheric pressure drops as altitude increases, the computer has to calculate fueling, spark timing, and air density. I wish tools that provide data would be more specific about the base of the data presented. Maybe this is general knowledge and I'm out of tune.

Does the engine have a sensor for boost pressure or has the sensor been replaced with a computer calculation like so many other sensors?

Manifold pressure in this case is apparently atmospheric pressure plus boost pressure. So the engine must necessarily have both an ambient air pressure sensor and a manifold pressure sensor.

 

[jmr]

It's not the most intuitive app. Intake Absolute Manifold Pressure must include atmosphere too to get 37 psi.
I've been using 93 octane exclusively and it seems at max boost of 22 psi it pulls the timing back to -7.5 degrees.

 

[Rezweld68]

Using a app on my phone for my 3.0 S/O monitoring manifold pressure boost and other sensors.
It appears the 22psi of boost that is advertised is accurate btw this was done using 93 octane gas.

View attachment 189192

I posted a video of 4 runs with the Rebel using 93 octane premium.
The video is at 20% speed to make it easier to view. Unfortunately there isn't a graph of the sensors just the numeric values.

What app is this and where can I get it? Thanks

 

[jmr]

What app is this and where can I get it? Thanks

It's called FourStroke and it's on my iPhone. I think it was $3.99 to get the option to read the sensors.

 

[Rezweld68]

It's called FourStroke and it's on my iPhone. I think it was $3.99 to get the option to read the sensors.

Thank you, I will look for an Android version.