Powerlogger - Analog 2 (boost) offset input adjustment question

S

slipstick

Member
I have been using a -0.08000000 offset adjustment for analog 2 boost in powerlogger for many years. I have been satisfied that the boost recordings are close to being accurate. My question is: does this adjustment have an affect on the Control B (Barometric Pressure) setting? If it does, it seems to me that I could find the perfect adjustment number by changing it so that the Control B setting matches current barometric pressure. I could park adjacent to my local weather station and change the adjustment setting until the Control B display agrees with current barometric pressure. Does this procedure seem logical???
Leon
 
S

slipstick

Member
Eric
The essence of my thoughts and question is: do you know if the analog 2 offset adjustment effects the barometric pressure recorded by Powerlogger Control B?
Thanks in advance for your opinion.
Leon
 
EricM

EricM

Administrator
Staff member
Yes it affects both. Control B simply zero's the boost to your current barometric conditions. Is that what you're asking?
 
S

slipstick

Member
My experience is that the barometric pressure recorded by Control B appears to be quite different from the barometric pressure posted by my local weather station (thus, I have wondered about the accuracy of my Powerlogger Boost recordings). I was wondering if the offset adjustment could be used to bring the Control B into conformance with actual barometric pressure and thus Powerlogger boost would be calibrated accurately. My weather station posts results every 20 mins. and I drive to the location so elevation is not a problem. The whole idea of the exercise would be to adjust the analog 2 offset so that BOOST is displayed very accurately.
As I mentioned in my first post, I have been satisfied with my -0.080000 setting for a long time. The thoughts and questions I have posted may or may not be significant to having a very accurate BOOST recording in Powerlogger.
Anyway, thanks again for your thoughts.
Leon
 
EricM

EricM

Administrator
Staff member
What MAP sensor are you using? The more expensive types can be a little more accurate (like the AEM 3.5 bar MAP sensor).

Control B is simply recording what your MAP sensor is reading with the engine off. The MAP sensor reading will be affected by your offset, and the accuracy of the sensor.

If you want to match your weather station, you can bump the offset up or down until the kPa on Powerlogger matches your weather station.
 
S

slipstick

Member
My MAP sensor is a 3 bar that I installed years ago. I'll look into a more accurate version as you have suggested. You answered my question re offset and Control B.
And, I can imagine that MAP sensors may be like mechanical gauges in that they have a mid range that is more accurate than the lower and higher pressure areas of the entire range.
 
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