Power Vision HeadT or ET settings.

[838]

I was under the impression that the ET calibration on the power vision was/is measured at the head. But now I see this head temp HeadT calibration as well?

ET and HeadT vary by about 100*F on my unit. What is the difference between these two units of measurement and what are the low, average, high and dangerous numbers for each unit??

Edit: For air cooled Twin Cam engines.

Thanks 👍

[Jamie Long]

You will monitor Engine Temp (ET) as this is based off the ET sensor and it is referenced in most of the tuning tables. Head Temp is based on modeling, typically used for theoretical temps based on a handful of inputs and is primarily used for the Spark/Temp correction, the Head Temp channel is going to report much higher than ET. Typical ET for a twin cam in a mild to moderate state of tune is 240-320 relative to conditions & load. When sitting stationary in hot temps it is not uncommon for ET to go above 350. 

[838]

You will monitor Engine Temp (ET) as this is based off the ET sensor and it is referenced in most of the tuning tables. Head Temp is based on modeling, typically used for theoretical temps based on a handful of inputs and is primarily used for the Spark/Temp correction, the Head Temp channel is going to report much higher than ET. Typical ET for a twin cam in a mild to moderate state of tune is 240-320 relative to conditions & load. When sitting stationary in hot temps it is not uncommon for ET to go above 350.

So a head temp HeadT reading of >450 is not uncommon or excessive for a street build? And ET is more accurately reading head temperatures since the ET sensor is on the head?

Is there a correlation between ET and oil temperature, since there is not a way to read oil temperature on the PV?

[Jamie Long]

You will monitor Engine Temp (ET) as this is based off the ET sensor and it is referenced in most of the tuning tables. Head Temp is based on modeling, typically used for theoretical temps based on a handful of inputs and is primarily used for the Spark/Temp correction, the Head Temp channel is going to report much higher than ET. Typical ET for a twin cam in a mild to moderate state of tune is 240-320 relative to conditions & load. When sitting stationary in hot temps it is not uncommon for ET to go above 350.

So a head temp HeadT reading of >450 is not uncommon or excessive for a street build? And ET is more accurately reading head temperatures since the ET sensor is on the head?

Is there a correlation between ET and oil temperature, since there is not a way to read oil temperature on the PV?

Not uncommon for Heat Temp to report 100 degrees higher than ET. There is not a oil temp sensor so there no channel to monitor it, no direct correlation as its not proportional to engine temps.