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Below is the detailed study of
the new HFS-5 system and the concept behind the designed.
Design aim of the HFS-5 water/methanol injection system:
In order to maximize of effect of water/methanol injection, the rate of delivery should be closely related to the real time engine operating parameters. The first objective is finding a signal that is comparable to the engine’s cooling/octane demand at the exact moment in time.
Finding the signal to match engine’s demand:
Load sensors such as throttle position, mass air flow and MAP sensor are a prime signal source of engine load. But without RPM reference, these sensors are only representing a two dimensional impression. For example, MAF sensor without RPM reference only measures air consumption, regardless of gearing or boost pressure. The engine could be cruising at high speed (less stress) or it can be travelling at 20mph on a rally stage under extreme load and high temperature stress. The same chuck of MAF signal cannot represent the engine’s running condition overall.
Why tracking fuel injector duty cycle:
With the help of the modern engine management system, the same chunk of MAF signal, coupled up with a bunch of signals gathered from sensors such as ‘air temperature’, ‘coolant temperature’ and ‘EGT’ (interpreting the lambda probe’s heater element) and of course, engine speed. It will make an informed judgment when to add or trim fuel depending on the real-time operating environments. The final decision made by the management will be reflected by the duty cycle of the fuel injector. The HFS-5 uses this IDC signal to meter flow.
Picking the correct delivery method and hardware to complete the task:
We have ruled out the variable pump-speed delivery system for a numbers of reasons. Due to the inertia of the rotating mass, variable pump-speed system is not responsive to the fast changing engine load at various throttle openings and engine speed changes, especially during gear shifts. Flow range is narrow due to limited pressure span. It requires 4x the pressure change to produce twice the flow change. Poor atomisation and pulsating line pressure at low pump speed is an inherent characteristic of such a system. Without consistent droplet size is vital to inlet cooling and even cylinder distribution, one will always tune for cylinder receiving the least cooling, resulting over-injection on other cylinders.
HFS-5 chooses the well established method for fluid delivery:
Decision was made to employ the ‘tried and tested’ delivery system similar to a fuel injection system to meter fluid flow. A 150W heavy duty pump is made specially for us by Shurflo USA. Equipped with three 125psi internal by-pass valves provides the regulated system pressure. A surge arrestor/accumulator refines the low-ripple further. A high-speed stainless inline valve completes the line up. This valve is capable of flow over a litre of fluid at 125psi. A dedicated controller reads the fuel injector’s duty cycle % and channels it to the inline valve.
A dash gauge displays the flow information from a digital turbine flow sensor:
Failsafe is serviced by the Aquamist’s proven DDS3 module, which is designed to go further then just detect clogged jet/nozzle and cut hose…..this device can give visual feedback on a partially clogged jet/nozzle. Two switched outputs provide the necessary interface with device such as boost control valve and map switch equipped engine controllers.
HFS-5 meets all criteria of a reliable and highly precise fluid delivery system:
We believe the HFS-5 is the only fluid delivery system that meets the minimum requirement for achieving full integration into your tuning programme, with absolute precision. Tracking the fuel delivery is the most reliable method to meter your water/methanol flow accurately under the whole engine operating range. Anything short of this means having to tailor your fuel map to compensate the irregular fluid quantity ingested by the engine.
Should you decided not to mirror the fuel flow in your future upgrade programme, the HFS-5 system can read a PWM output from a third party engine management controller so a custom water/methanol map can be created.
This one-time offer is a rare opportunity of a life time for you to try out this professional system at a very affordable price. Jack our US representative will be hosting this offer.
We will be posting the pricing details and the link to the introductory offer next week here.
Last edited by Richard L; Jan 26, 2007 at 03:51 PM.
as far as two tanks goes, from the site listed it appears that the multi-gallon tanks were an odd shape, so he probably went with the 4 or 5 quart tanks to give him about 2-2.5 gallons of meth while being able to save space and mount them where they are!?? Just my guess.
A Study found that the average american walks around 900 miles a year. Another study found that americans drink about 22 gallons of beer a year. So on average americans get about 41 miles per gallon.