$5D spark map

[300kwv6]

Hi All,

Just looking through some older $5D bin files and notice in the F1 SAMAIN: Main Spark Advance vs MAP and RPM it only goes upto 4800 rpm. What happens when the revs are above this point?

Here's an example:

spark_map.jpg (136.59 KiB) Viewed 3580 times

Cheers

[VX L67 Getrag]

If its like the newer models it will just flatline at that spark setting till it reaches rpm max setting in the calibration!

[antus]

have a read of this thread from here, its done the same way.

https://pcmhacking.net/forums/view ... 4&start=10

[300kwv6]

Thanks for the info. So if using 12p we fill in timing across the board and don't use extension slope?

[Holden202T]

yeah thats correct, if you are transferring a tune from 5D say into 12P use the extension slop number as a guide ... eg. 2 degrees per 1000rpm, should be pretty straight forward to work out the increase on the 12P table and apply the same from 20-100kpa.

[300kwv6]

Thanks. I guess this must've been a limitation of the factory based tunes.

[Holden202T]

well it also means 1 number can be used to create values for alot of cells and hense save space, i dare say its more a matter of smaller bin file limitations.

[antus]

Thats true, those original factory bins are only 16kb. We have more and higher resolution tables in 12p, but thats got 32kb of space available. I guess at the factory they also were building daily drivers and up there a 1 number slope was probably close enough for rpm which the engine wouldnt spend much time in on the trip down to the shops or cruising on the open road - especially with an auto behind it. That one was probably high up on the 'compromises we can take' list.