I may be going about this wrong, but is it safe, or possible to add RPM points in the low octane/high octane timing maps? For example, "5250" between 5000 and 5500.

I can seem to totally grasp the interpolate function yet. Can someone help explain interpolate horizontal, vertical, and 2D. Does it mean it will copy the data up or down when you hit ALT+B for example?

Thanks.

 

You cannot add RPM, however you can rescale.

 

I don't know exactly how the ECU interpolates, but I would assume it's something at least vaguely similar to:

Formula:
Timing = [
(Map[0][0] * LowLoadAffinity * LowRPMAffinity) +
(Map[0][1] * HighLoadAffinity * LowRPMAffinity) +
(Map[1][0] * LowLoadAffinity * HighRPMAffinity) +
(Map[1][1] * HighLoadAffinity * HighRPMAffinity) ] / (LoadDiff * RPMDiff)

So example:

Q. Determine actual timing advance for 5400RPM, 245 load using:

3D Map > Raw Data:
LowerLoad = 240
UpperLoad = 260
LowerRPM = 5000
UpperRPM = 5500

Map[0][0] = 6
Map[0][1] = 7
Map[1][0] = 8
Map[1][1] = 9

LoadDiff = UpperLoad - LowerLoad = 260 - 240 = 20
RPMDiff = UpperRPM - LowerRPM = 5500 - 5000 = 500

LowLoadAffinity = LoadDiff - (Load - LowerLoad) = 15
HighLoadAffinity = LoadDiff - (UpperLoad - Load) = 5

LowRPMAffinity = RPMDiff - (RPM - LowerRPM) = 100
HighRPMAffinity = RPMDiff - (UpperRPM - RPM) = 400


A.
[(6 * 15 * 100) +
(7 * 5 * 100) +
(8 * 15 * 400) +
(9 * 5 * 400)] / (20 * 500) = 7.85°

But that's just a guess, because I've got nothing better to do on a Sunday morning.

 

I made the above formula into an interactive PHP script: http://www.rallyevo.com/interp.php

 

ehhe shameless I think he was asking about the interpolate function in EcuFlash.

but you get a A+ for effort.

 

lol, oh well, I have fun doing little projects

 

phew, right over my head for now. Thanks though. Hopefully, I'll understand all of it soon.