draab2006

iTrader: (1)

Hey guys, I have HP tuners and I have been trying to diagnose some minor detonation/pre-ignition my car has been experiencing when it's hot outside. I noticed however that my histogram for timing logged a lot of reads of 40 degrees of timing, with some as high as 44 degrees. Is this normal? This seems like it's a little too advanced, I would imagine somewhere in the 30's is normal. It seems to only be in the 40's when the cylinder air-mass is under .2, anything higher and it gradual dips down to as low as 20 degrees. Am I being too worried?

ddnspider

iTrader: (26)

Yes that is normal, most RPM in the low g/cyl region are in the upper 30's to 40 degrees.

MontecarloDrag

iTrader: (3)

There are some calibrations with even 50 degrees in the areas of very low load

draab2006

iTrader: (1)

Thanks for the reassurance guys! I am particularly weary of any readings I see because I have noticed pretty considerable detonation at around 2,000 rpm under load. It is especially noticeable when it's over 85 degrees outside. With HP tuners, is there a good way to "see" detonation via knock sensors via logging?

MontecarloDrag

iTrader: (3)

Yes, include the PID called "Knock Retard" in the main table. It will register any knock the sensor can pick.

draab2006

iTrader: (1)

Awesome, thank you!