I've always felt, reasoned and had experts agree that it's bad to have the trailing ignition fire before the leading. I believe this a PRIME engine popper when encountered at the right/enough times.



I just reviewed a map from a reputable mechanic. There were 22 incidents of negative split in his "tuned" map.



If you have a PFC and Datalogit, it's easy to check on the TRAILING screen. Click on the split checkbox.



CHECK YOUR MAPS!



http://home.columbus.rr.com/dv8/badmap.jpg

wow that is REALLY bad!!!!!! i'm gonna move this to the ECU forum ok ?

Damn thats not good! I don't understand how to read the map though. Can someone explain? I want to check my split.

Also, is there a way to view this through the commander? I'll have to borrow my friend's datalogit otherwise.

i just recently figured out how read POWERFCESE https://www.nopistons.com/forums/pub...#>/biggrin.png



to program a powerFC you take a base unit "r" and multiply by the number in the cell for instance of above



-14 x R = -14R



put in a number for R say 5



you get R= -70



that is how you read a PowerFC map and its correction factors :bigthumg:

Although, there're negative split in some of those area, the one that it looks very dangerous (-14) is actually not a concern since you can only get into those areas at deceleration and zero throttle.

What about the ones in n18 and n19?

is the PFC acurate enough to NOT fire the trailing before the leading in the case of all the 0 splits? just wondering. i am not familiar with the pfc... but from what i can make out, it looks as if the split actualy increases in the higher rpm/boost ranges. (if that is what they are). my question... in those areas, do you think it may be wiser to actualy decrease the split to make up for the higer speed of the motor? in some instances it looks as if the split is 15* after. the way i have mine set up in the haltech is that the split actualy is lower at the higher boost levels... lets debate the split a little bit here.

does that output screen on the datalogit tell you the actual split ? i know the method i used above you need to use with the commander

yeah...i didnt understand your method. not by looking at the datalog anyway. https://www.nopistons.com/forums/pub...IR#>/dunno.gif

it does sound very intreguing...i wish to subscribe to your news letter https://www.nopistons.com/forums/pub...#>/biggrin.png