## Equation for PSI value in ADX

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**1**of**1**### Equation for PSI value in ADX

I would like to add a PSI value into into my ADX, it currently has the number displaying in KPA but i would like to be able to see it as a PSI reading also.

I just dont know what the equation would need to be

the one for KPA is (X * 0.781) + 8

What would i need to have here for the PSI value ?

Peter

I just dont know what the equation would need to be

the one for KPA is (X * 0.781) + 8

What would i need to have here for the PSI value ?

Peter

### Re: Equation for PSI value in ADX

enclose the whole lot in brackets and multiply by the conversion factor from kpa to psi, which is 0.1450

### Re: Equation for PSI value in ADX

so your saying it should read

((X * 0.781) + 8) * 0.1450

Because it doesn't appear to be right when i play the log back

((X * 0.781) + 8) * 0.1450

Because it doesn't appear to be right when i play the log back

### Re: Equation for PSI value in ADX

well if you want boost psi you will have to minus the atmospheric pressure off of it. so more like (((X * 0.781) + 8) * 0.1450) - 14.50

- Holden202T
**Posts:**9889**Joined:**Sat Feb 28, 2009 9:05 pm**Location:**Tenambit, NSW

### Re: Equation for PSI value in ADX

this is what I use for a 3 bar map sensor to get boost PSI

X * 0.177 - 14.185

X * 0.177 - 14.185

No matter what the question is, the answer is always more horsepower!

Just starting out? Have a read of the getting started guide

Basic tuning of a delco ECM with $12P thread

Advanced tuning of a delco ECM with $12P thread

Just starting out? Have a read of the getting started guide

Basic tuning of a delco ECM with $12P thread

Advanced tuning of a delco ECM with $12P thread

### Re: Equation for PSI value in ADX

The easiest option (and the best for the least rounding error) is what Jayme suggested. If you want to simplify it the calc is...

2 Bar = (X * 0.113)-13.54

3 Bar = (X * 0.177)-14.381

2 Bar = (X * 0.113)-13.54

3 Bar = (X * 0.177)-14.381

- Holden202T
**Posts:**9889**Joined:**Sat Feb 28, 2009 9:05 pm**Location:**Tenambit, NSW

### Re: Equation for PSI value in ADX

yeah I only use it with zero decimal place, I don't really care exactly what it is, just want to get an idea of what PSI its running when I change wastegate springs and the like.

No matter what the question is, the answer is always more horsepower!

Just starting out? Have a read of the getting started guide

Basic tuning of a delco ECM with $12P thread

Advanced tuning of a delco ECM with $12P thread

Just starting out? Have a read of the getting started guide

Basic tuning of a delco ECM with $12P thread

Advanced tuning of a delco ECM with $12P thread

### Re: Equation for PSI value in ADX

Thanks for that info, I guess I could have worked it out but was a bit unsure what most of the values where for.

### Re: Equation for PSI value in ADX

Will certainly be accurate to 1 decimal place

You could also change the calc to reference baro, so you see the true boost pressure.

You could also change the calc to reference baro, so you see the true boost pressure.

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