Disassembly: Ignition Trim Tables

[Nater3kgtVR4]

Any info on adjusting the ignition coil dwell settings to get a smoother power band?

[Fakepower]

What is the load axis unit? MAF or kPa? Thanks for the clarification.l

[Greg E]

MAF pulses * MAF size

[Fakepower]

Thanks Greg,

Is there a good way to translate Maf load into a speed density load? ie PSI

Edit: I've uploaded an excel spreadsheet of the data in a more "speed density format", with 3D maps included. please look over the data, I've done what I can to make sure I entered it right.

[Greg E]

No there isn't. Pressure will always change depending on air volume. The MAF measure air volume. A pressure gauge is just resistance on a pipe. This changes depending on volume, temperature and barometric pressure.

Neither have a direct relationship.

[KeithMac]

Hello Greg, I 've recently set base timing and noted timing retards as rpm increases when locked (due to delays in the transistors etc).

Is there a "trim" for this to make sure commanded timing is actual timing at higher revs?.

Also do you know if the timing reported by the OBD port is shown with all the trims already applied?.

Cheers, Keith.

[Greg E]

Hello Greg, I 've recently set base timing and noted timing retards as rpm increases when locked (due to delays in the transistors etc).

Is there a "trim" for this to make sure commanded timing is actual timing at higher revs?.

It's caused by CAS latency. There maybe a trim but I never owned a 91/92 car so I never went hunting for it. Most guys just adjust the big table to match.

Also do you know if the timing reported by the OBD port is shown with all the trims already applied?

Yes. What you're seeing is the final output.