LA sequential fuel and spark EFI conversion

TF360 said

So it actually fires in sequence. Are the injectors close enough to spray the precise amount at just the right time. Looks great

Click to expand...

Yes. For the fuel, the injectors can be batch fired or sequentially fired. In batch fire systems, the ECU usually limited outputs for the injectors. So you would likely group one side of the engine on one output and vise versa. This means fuel is sprayed onto a closed valve. This isn't a big deal since it is essentially what a carburetor does. Sequential means it sprays on the fueling event for that particular cylinder.
For spark, there is wasted spark and sequential. It is essentially the same as the injector, only the plug is sparking in a cylinder that is already on the power stroke or exhaust stroke so the spark essentially does nothing. Sequential acts like a distributor. The cool thing about having individual coils for each cylinder is it negates the need for an external spark "enhancing" box like an MSD. The reason we use an MSD box is to charge the coil faster. With only one coil having to fire for every cylinder, sometimes it can't charge fast enough. Within tuner studio, the dwell time of the coil can be adjusted to increase the spark output of coil. It's pretty neat to see. There's also no need to purchase those high dollar aftermarket LS coils, the stock ones are fine. I've seen several people running 1500HP boosted applications on stock LS coils. Don't waste your money on that crap.