Kpa to Psi conversion at altitude

[StealBlueSHO]

http://www.convertunits.com/from/psi/to/kpa

Try this calculator...It's a resource I use....I get confused myself when you start talking about pressures in absolute and relative to atmosphere.

When I put in "0" PSI (relative to atmos.) I get 101.32 KPA so I think that is a constant which is why KPA is nice...When we all talk PSI we mean relative to atmosphere...So when you use KPA you don't have to make that assumption...Which is why I think when you log desired TIP in Livelink it only can be viewed in KPA..Maybe MAP too but I forget...I like looking at them both in KPA

So if 0 PSI relative to atmosphere is 101.32 KPA then 184 KPA is 12 psi the way I see it....But I could be wrong

Is it accurate to say 12 psi at your altitude is equal to 14 psi at sea level? Maybe but it starts to confuse me there

Totally. Both of my SC cars make 2 more PSI of boost at sea level on density alone. Someone's we get lucky when it gets cold and we'll get an extra lb of fun. Our dyno correction factors here are usually 15-17%.

Right, but that would be for a car that doesn't limit the output.

On my tunes I set boost limits and load limits.

In the stock SHO strategies Ford uses boost limits and load and torque limits

Setting boost by commanded tq is the way to go actually and what ford does...It delivers the most smooth power and a consistent car at all elevations but boost will  change with that model..

In the tuning world people say " I want 12 psi" or whatever it is they want....I wanted about the same psi from 2000-6000 RPM...It's just what I like to see...When people see boost all over the place they think there is something wrong

So.... Here is a question for you... Is load considered the total amount of torque output calculated by the ECU?

A couple questions then and pardon my ignorance...

A: In all my logs load almost exactly mirrors what my intake manifold map sensor reads from a boost perspective...is load also accounting for air density (altitude, temp, humidity, etc) and also timing advance?

B:  If in tuning these cars, load limits are set, and I notice that in some tunes the throttle blade is used to control total load production, then does it matter if the charge is cooler or warmer if the car is going to limit load anyway?

Thanks in advance Bradley!

 

[ZSHO]

Here is a chart for reference and it starts at 14.7psi which is 0  but for every 2000ft it drops down 1psi which then equals to 13.7psi. IDK.  Z