Can someone look at the drivers side turbo??

[Blue_Raptor]

Without the turbo, you would see constant vacuum, and a lot more than the vacuum you typically see on the Raptor. So it is boosting, just not always in the positive. That's my understanding.

That's not quite how it works. Our engines see "full" vaccum all the time: during throttle off deceleration. NA engines obviously never see boost as there no hardware to create boost, but at WOT the vacuum will be around zero. On Turbo vehicles, the turbo is not always boosting. Its always spinning (with the engine on) but not always producing boost. Boost is dependant on engine speed and engine load. You can very slowly (i.e. very little engine load) take the engine up to 5K and it will not be making boost. But if you floor it from idle it will start producing boost as soon as the engine is in the appropriate range for the size of the turbo.

Since our trucks are heavy bricks with (relatively) large tires, the load placed on the engine is higher even considering the size of the engine. At a steady 70 on a flat section of freeway, I will be right near 0 boost/vacuum whereas in my old Fiesta ST 70 on a flat freeway was decidedly in vacuum. It takes more engine load to move our trucks.

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[got3fords]

That's not quite how it works. Our engines see "full" vaccum all the time: during throttle off deceleration. NA engines obviously never see boost as there no hardware to create boost, but at WOT the vacuum will be around zero. On Turbo vehicles, the turbo is not always boosting. Its always spinning (with the engine on) but not always producing boost. Boost is dependant on engine speed and engine load. You can very slowly (i.e. very little engine load) take the engine up to 5K and it will not be making boost. But if you floor it from idle it will start producing boost as soon as the engine is in the appropriate range for the size of the turbo.

Since our trucks are heavy bricks with (relatively) large tires, the load placed on the engine is higher even considering the size of the engine. At a steady 70 on a flat section of freeway, I will be right near 0 boost/vacuum whereas in my old Fiesta ST 70 on a flat freeway was decidedly in vacuum. It takes more engine load to move our trucks.

Apparently, boost is anything above 0 psi. That's where I went wrong.

 

[Blue_Raptor]

Apparently, boost is anything above 0 psi. That's where I went wrong.

Yes, that is correct.

 

[jordantii]

I'm glad my picture request has turned into something more. Good info. I'm just surprised that @Mystic was not the hijacker...

 

[Mystic]

I'm glad my picture request has turned into something more. Good info. I'm just surprised that @Mystic was not the hijacker...

Hang on, I gotta hijack your other thread about paint chips first...there's a method to the madness.

 

[jordantii]

Hang on, I gotta hijack your other thread about paint chips first...there's a method to the madness.

Hahahahaha! You're the best!

 

[landiscarrier]

Boost PSI does not automatically equate to more HP.

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