New to injection

[UpgreyD]

Hey all

New guy here, came to learn all I can about water injection

A little about my project:

2007 wrx 2.5L EJ55 USDM sedan

current engine mods:

Cobb Access port stage 2 ECU tune - stock intercooler and TD04-13T turbocharger with 4" bellmouth turbo downpipe mated to a full 3" catted exhaust at 16psi by 4500rpm.

Plus additional irrevelant suspension mods.

So, what I'm looking for is some education and guidance.

In the future, I'm looking to add a larger intercooler, a larger turbocharger with a possible 49lb or 52lb compressor wheel and internal wastegate, other relevant fuel upgrades and of course Aquamist.

Currently, I'm confused as to what the differences are between the HSF-3 and HSF-6. Looks like the HSF-3 gauges flow based on a PW modulated signal from the fuel injection cycles in the ECU? How does the HSF-6 gauge this? Looks like there's an additional flow control module?

I'm looking to also run an electronic boost controller with a 3-port solenoid. Maybe the AEM tru-boost or turbosmart e-boost2. How can I run this system in parallel with an aquamist system to allow the boost controller to switch to wastegate pressure should the water/alcohol injection fail as an added failsafe?

thanks in advance :D

[Richard L]

Both HFS-3 and HFS-6 uses the fuel injector signal as prime source for flow control. Th HFS-6 has more F-IDC re-scaling function compared to the HFS-3's idc gain only.

For example, if the incoming iDC is 30%, the HFS-3 can multiply x2, 1 (default) or divide it by 2

The HFS-6 can pre-offset the same 30% signal by +/- 20% before the multiplier. It will also compensate the idc due to increase manifold pressure.

Gauge and failsafe is identical except the HFS-6 trimmer the failsafe reset timer compared to the HFS-3's 3 seconds.

Flow control valve is the same on both except the driver circuitry is built into the FCM.

Both systems can reduce boost to wastegate pressure of cutting the control line of the boost controller to the BCV in the event of failsafe activation.