Batch fire will get you 95% of the HP. Sequential with AFR balancing will get you another 3%, proper injector timing phasing will get you another 2%.
Basically on a 900HP engine you can pick up another 40HP with sequential and proper injector phasing. In tight racing classes that can be the difference between winning and losing. On the street, not so much difference. There are obviously some small variances in the percentages gained depending on the engine and horsepower output, but my friend has had pretty repeatable results with racing Hemi's and engine master's competition. Both competitions where every last HP is searched for.
