Nissan ECU Tuning

sideways danny · Joined: 01 Nov 2006 Posts: 43

has anyone made an xdf file for the CA18DET to use in tunerpro? I'd like to give this software a go but address files are a little out of my scope of understanding

skyshack · Joined: 09 Feb 2006 Posts: 4 Location: Burton on Trent, UK

OK here it is.

I've had problems with the AFR map and had to leave it as raw data.

Can't use this in conversion as no "IF".
14.7 * if DATA > 128 then Factor = (DATA - 64) / 128 else Factor = (DATA + 128) / 128

Tried
14.7 * (X + (128 - 192 * ( X & 128) / 128)) /128
didn't work as the "&" operator doesn't seem to function

So tried this
14.7*(X + (128 - 192 * ((X / 128) - (X % 128) / 128))) /128
That did work but some values were wild ~ 23AFR.
Also didn't work for hex$80
$7F = 127, factor = 1.992 OK
$80 = 128, factor = 2, result = 0.5
$81 = 129, factor = 0.508 OK

If a value in no Feedback area was changed and the map saved it was saved with Feedback active.

http://www.fast-files.com/getfile.aspx?file=15104

sideways danny · Joined: 01 Nov 2006 Posts: 43

Tunerpro is THE SHIT!!!!!!! Peter you are amazing!!!!

skyshack · Joined: 09 Feb 2006 Posts: 4 Location: Burton on Trent, UK

Today I realised ECU uses Base TP x factor NOT AFR x factor.

AFR = 14.7/factor

Conversion should have been
14.7*128/(X + (128 - 192 * ((X / 128) - (X % 128) / 128)))
Still won't work as the set value would always be for feedback on.

But the AFR that calc gives is just a notional AFR as the base TP is for a single condition with base efficiencies for thermal, combustion and mech. The factor provides a correction not just for AFR but also for the variation for those efficiencies from the base. So presenting the AFR would only lead to trouble as the measured AFR won't match.