[Richard L]

The HFS-3 cannot (compared to the HFS-6):
- offset against the initial F-IDC - the F-IDC threshold % = starting point of meth flow %
- It doesn't have manifold pressure compensation, but can use it as a reference for injection (see below).
- alter the failsafe reset period = pegged at 3 seconds
- read "Direct Injection" pulses such as the 335i or Audi FSI pulses
- control a MAC valve directly as with the HFS-6

The HFS-3 can:
- scale-up/down the incoming F-IDC for car with very large fuel injector that doesn't run up to 100%.
- You can run the system based on boost or IDC only. In single stage or progressive mode.

The HFS-6 is more suited for engine with large turbo with power beyond 550whp.