battery voltage vs data logger batt voltage

[a73_4g67]

Hey guys, do you have the same reading from battery voltage and logger batt voltage?

Mine reads 13.1 from data logger during idle. Ive let a battery shop test the battery. It reads 14v (healthy reading)

During WOT/hi load, logger batt voltage drops to 12.0v

I've checked my AF using a wideband. It leans out after 5.5k rpm. Goes up to 12.4
Ive adjusted the AF on my chip and it still reads 12.4. From 11:1 to 10:1 on the af map.
Though I have minimal knock using pump gas(93 ron), 18psi Evo 3 16g, 21 max tima.
stock engine.

I have a 190lph walbro pump with relay. 650cc injector, stock reg. 650cc corrected at 33 hex from the chip.

 

[JDMath]

mine read 13.9 -14.2 like its suposed too... i dont know why it doesn't give you the same reading... what program do you use to log??

 

[a73_4g67]

mmcd 1.8. weird. I trust the logger than anything else. Im thinking the low voltage is the reason why Im leaning out at 5.5k rpms up.

Ive seen 13.7v at idle and 13.2 at WOT on my friends car.

mine read 13.9 -14.2 like its suposed too... i dont know why it doesn't give you the same reading... what program do you use to log??