Hondata

Does someone notice power reduction on dyno sometimes?

I tune 2 civic Si 2012 last week, and sometimes the power in the powerband drop

I attach the dyno sheet, and the datalog files

Ignition, throttle, cam don't change at all during the run.

both cars do it.

You need to post the calibration that was used when the datalog was made.

here is the cal file used

I did 3 dynoruns with this calibration.

2 were fine, one has the dip

The only thing I can see is that it gets a little leaner in the 6000-7000 rpm range on the datalog, but I do not see anything else in either the datalog or the calibration.

I see the same thing, and I don't understand why the car do that, this happens a couple of time the same day on 2 differents civic Si 2012

The only other thing that I can see that could be effecting this is the knock ignition limit tables where there are negative values. Read more about this at http://www.hondata.com/help/flashpro/kn ... tsub=knock