Injector Latency or Injector Dead Time
One of the Speeduino settings that determines when the injector actually squirts is the amount of time between when the injector gets power and the time that it actually squirts. This is called latency or dead time. Depending on the injectors you choose, you may be able to find the latency on the internet or not. For the Acell 150117 17 lb/hr injectors I chose, I could not find the data. I called up Holley technical support (Holley bought Acell), and they searched in their files for about 10 minutes and couldn't find the spec, either. The default injector latency value in the Speeduino .ini is 1ms, so that is what I used. After doing a lot of searching, I came upon a method described by one of the Speeduino Gods (PSIG - David), that shows how to collect data once you've got a good tune and use it to calculate the real latency for the injectors you're using. Setting this correctly is seen as making things "better" or "right" so you know I'm going to try it out.
I just wanted to share the link to PSIG's draft paper on how to do this magic trick: