[BLSTIC]

I'm about to build a very octane sensitive engine. Factory released figures show a 7% increase in torque in the same engine, between regular and premium fuels (91RON to 98RON), with that total being 10.5% higher than the otherwise damn near identical earlier variant that was tuned for 91 and had lower compression. Naturally I want that torque. There are higher compression again engines, but those are designed for stupidly high octane LPG, so I'm not sure I should try running 12:1 on a 3.6x3.9" bore/stroke short revving engine.

Because of the apparently octane sensitive nature of the engine design I want to run water injection to make the most of it. Because it's a naturally aspirated engine with bulk low-rpm torque (420Nm from a 4.0L engine, or 310ft-lb from 243ci) it needs to react really fast. Fast enough that I'll probably use the rate of TPS increase as an earlier trigger than solely manifold pressure.

So what systems have you guys got that are suitable for naturally aspirated engines, have good atomisation, and have close to zero response time?