[Richard L]

Originally Posted by DiGiTaLBee

That's what I thought. But why is it missing from this system? I think (and maybe wrong) that with smaller engines, and the PWM-Valve working at lower speeds, this is needed more than the HFS-6 system that is intended for more powerful engines, as Richard pointed out. Did it up the price of the kit too mutch or it is really not needed? Can I have a kit with it or install one myself? I am planing on doing "direct port" injection that is why I am concerned about the pulsating jet so close to the intake.
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Sorry for asking so many questions but this is a new kit and not match is written about it.

Thank you both for your replies

The item in question does two jobs. It stores a small amount of pressurised water from the previous injection event on readyness for the next event. This fills the gaps where system pressure can drop by a small amount before the water pump spools up from a dead stop to arriving at the intended system pressure. The second job is to softening the hammer-effect caused by the rapid on/off action of the inline valve.

One of reason for omitting it is final system cost, we have to trim $200+ off the HFS-6 so people can afford a PWM valve system other than the HFS-6. We have been criticised for not designing a system for the masses.

As to the effect on the overall system performance in its absence, it is mimimal. This is because the HFS-3 is designed as a trunk mounted system, the long pressurised nylon hose (18 feet) between the pump (in trunk) to the inline valve (engine bay) will act as the 22cc surge arrestor/accumulater.

The item can be purchased separately, part #806-409. You need to get the kit of parts as on the HFS-6.

Please ask as many questions as you want, this is the place to do it. Information-overload and just as bad as providing too little.