I am thinking about converting from the Snow Stg 2 kit to an Aquamist kit. My big question is what is the difference between the HFS-1 and HFS-5. I am on the stock turbo and will be upgrading to the FP Green soon. I have all the other bolt ons. I just want to know what the differences are and do I need the more expensive one of the two.
Thanks.

 

In a nutshell

The HFS 1 is a single stage unit that basically turns on at a fixed set point. It has a flow sensor, gauge and has built in fail safe. You adjust the flow rate by chosing the jet size.

HFS 5 adds an accumilator so the pump remains at a steady 125 psi and pulses a high speed valve to deliver alcohol in proportion to injector duty cycle in a very linear and smooth manner.

If you buy a HFS 1 you can always upgrade it to a HFS by buying the parts needed to upgrade.

I really like both the kits and have found them both to be highly effective. While the HFS 5 is the superior unit, I have been really excited about the great results and simplistic basic set of of the HFS 1. Bang for the buck its hard to beat all the features of the HFS 1.

Either way they both have the principle advantage of Aquamist - mainly a flow sensor and gauge.

Al

 

Could you please PM price for each to 91915.
Thanks

 

Just out of curiosity: it sounds like the HFS-5 is approaching the operation of a standard no-return-line fuel system (only it delivers water/meth/alky). Is there a reason nobody has looked at using just an off-the-shelf fuel injector for WI and controlling pulse width just like you would for fuel?

 

thats basically what the aqaumist system is. Only you have the ability to run several nozzles with only one HSV. This way it is a lot cheaper than needing say 4 injectors if you wanted to do port injection. You can simply run 4 nozzles, and better yet you can change out the nozzles whenever you like.

Also, it is much easier to install a tiny nozzle in a UCIP than a large fuel injector.
With the fuel injectors you would also have to figure out how to feed it with alky. Injectors are designed to feed from a fuel injector not a thin 4mm line.

 

I am not sure if fuel injectors can be used for methanol but there are other factors such as seal/leakage. Most injector is good for 3-4 bar pressure differential, above that, acceptable leakage cannot be guaranteed. (all metal/metal valve is prone to some leakage, worse with age).

Another factor is the contaminant within the fluid. The fuel system is very well filtered but I am not sure if joe public can ensure the filtration and contaminants are kept to a minimum especially non-demin water is sometime mixed in with the injectant.