DIY LTCC or similar system for LT1s

[kur4o]

You have gathered some immense quantity of data. Amazing job. I bet you have freaked out at some point.
Too bad we didn`t have the spark energy output. And that coil discharge time is awesome.

Map correction proved useless so you can ditch that input and use ECT instead. I discovered that 96-97 lt1 calibrations have some added code for dwell. An rpm vs voltage calculations and Map corrections. There are also 3 different dwell calculations used by the TPU, just like in the later ls1 code. Map os also fixed at *1 correction.


I examined the data you have for the d580 coils which I also have. The GM data is at 85% for not normal operating range and close to 93% at normal operating range.
So these coils are maxed out from factory.

The other coils are more like one size fit all settings, since they are at least 2 different interchangeable coils for given application.

I also managed to make the full coil list with part numbers, stamp number and years of usage.

Gen0
1. 12558984 p/n and stamped; d580; square ls1 cars 97-04 made by denso.

Gen1
2. 12558693 p/n and stamped; d581; square ls1 truck 99-04 made by mitsubishi.
3. 10457730 p/n; 19005218 stamped; d585; round ls1 truck 99-07; made by ??ac delco

Gen2
4. 12611424 p/n
4.1 12570616, H6T55271ZC stamped; melco mitsubishi ;d510c square; truck 07-13
4.2 updated with 12611424 acdelco stamped; d510c square; truck 07-13
5. 12573190 p/n and stamped; d514a; round 05-13 cars, trucks; made by delphi

Gen3
6. GM 12619161 p/n and stamped; square 14-on; made by GM or ??delphi??
7. GM 12658183 p/n and stamped; round 14-on; made by GM or ??delphi??


I am not getting a heart attack. The plan you have seems good enough. Not sure if 2 2d tables can substitute 2 3d tables but it will be close enough. The gm data proved to be upto the 85-93% safety margin, so perfectly suitable to be used as a starting point.

I have 3 different theories why there are no multi spark implemented.
An overkill.
NO real gains or improvement.
Code implemented for emissions but not needed or used or code is not polished enough and needs improvement or some undesirable side effects experienced during testing.



Looking again at the data, there might be some modeling or pattern for coil temperature vs engine coolant used by GM. Some of the coils[gen1] are off the chart at 100*C and I doubt they can reach that levels underhood.
SO gen1 used much higher safety margin, guess the 1 size fit all +20% was applied there.