WMI
I'm wanting to push close to the limit of that setup on pump fuel and the climate here is hot, which hinder this goal. So additional system will be added to "combat" with the hot air - water-methanol injection. In short, fine spray of water and/or methanol is injected in intake path during high loads. The process of transition from liquid to gas of that mix take a lot of heat and intake air become cooler, which help with suppression of detonations. On other hand, the methanol have higher octane rating than petrol and in that way the octane rating of air-fuel mixture is increased. That is a very simple explanation and there is more detail articles and videos on the net.
Generally, WMI kits offered are separate systems controlled by their own control unit using additional data like boost or fuel injectors duty cycle to achieve that. The goal here is WMI system to be very advanced and controlled by ECU as everything engine related. For that goal, the system will be complicated and will consist of a lot of parts.
The pump, hose, nozzles, holders and check valve are from Snow Performance
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Two nozzles will be used: 375ml/min at 40psi (size 5 in their nomenlature) and 225ml (size 4), which was ordered later. Generally different WMI manufacturers rate nozzles differently.
Red hose doesn't comply with my color concept and black one have been sourced.
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Injection will not be controlled only by start and stop of pump like is done on most of the kits, but will be used also a solenoid which will be PWM controlled by ECU. For that task have been bought ProMeth solenoid
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As a tank is used washer fluid tank from some Lancia Lybra, which is located on left on it and here it will also be on the left in the place of air filter box. It also have low level sensor, which will be used in the fail-safe strategy. Such solution was intentionally searched as I want closer to original looking and no additional tank in the trunk for example, which is normal for such systems.
Most off the shelf kits have very basic fail safe feature or doesn't have any at all. For advanced fail-safe device is used AEM Water/Methanol Failsafe Gauge. Also have been bought their WMI filter.
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It is a standalone system with flow gauge, which is also a control unit. Have its own interface from which it is configured. It can provide fail signal as an output to other system and it is used in the ECU. Failsafe is very important for WMI as if the tune is more aggressive and dependent on WMI and that system doesn't work as intended, then catastrophic result can happen.
Unfortunately, look like their flow sensor is not specifically designed to work with methanol content and have failed on other car after not so long use!
So to avoid such scenario (hopefully) have been bough Aquamist flow sensor, which is specially designed to work with methanol and also use different more linear principle to measure flow.
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It also need a dedicated cable provided also by Aquamist (on above picture are showed two sensors and cables for them). Both AEM and Aquamist flow sensors return frequency signal, but range and characteristic is different between them and hence flow gauge will not indicate as intended, but more important is catch of fail situation. After some testing on other car have been seen that the difference between actual flow and this showed on gauge is small.
As the gauge in AEM's WMI fail-safe is not only a simple gauge and have to be in the car, so it will be used also as a gauge. Generally this is not as per my gaugeless concept, but as it have to be in the car better to be normally visible. Also in addition to fluid flow it have indicators for low and high flow as per configuration from user interface.
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