HFS-6 Inconcistent Injection

[trdhilux]

I have also run trough my calcs for jet size. Original installer had 1mm jet installed.

240cc injectors x 6 + 440cc 7th injector =

1880cc/0.15 (water or 50/50)=

282cc/min water meth=

0.5mm jet

Does this seem right? There is no boost compensation in jet pressure as water is injected pre supercharger.

Josh

[trdhilux]

Richard have you got anymore suggestions for me? There doesn't appear to be any corrosion?

Regards Josh

[Richard L]

Looks very clean to me. Good.

What are the flow results of a 1mm nozzle for 1 minute?

Looks clean from the outside. I wonder how clean is the internals, FAV and flow sensor. Do you use distilled water?

One more possibility for inconsistency. Since the pump is not water proofed. The internal bearing may be partially seized and cannot generate a proper pressure. Can you remove the pump head and check the pump bearings.

Alternatively, splice in an inline 300psi pressure gauge, and check if the line pressure is around 160psi.

[trdhilux]

Haven’t done a times flow test yet, will do that soon and report back. Will be with the 0.8mm jet as I recently changed down to that.

Yes always use distilled water, I will go over the pump and see if there is any corrosion. When I have put into TST before, the flow seemed to be solid with no variance in flow for the whole test period, this was for quite a few minutes as I ran nearly two liters through it. How does the flow sensor work? Is it an external sensor? I can only see cabling going to the circuit board, nothing going to flow sensor, or is it a paddle wheel and Hall effect type arrangement?

Will report back soon.

Josh

[Richard L]

Flow sensor is the hall effect type. It senses the rotating speed of the magnetic turbine within the metal tube.

If flow is not steady under TST test, pump is the prime suspect.

[trdhilux]

That is understandable, when i was in TST mode though it wouldn't register at all, apart from an intermittent spike every now and then of 2 bars. makes me think the sensor wheel may be sticking. is there anyway i can pull it apart and inspect? havent had a chance to do a one minute flow test yet.

regards

[trdhilux]

Bit of an update of some work i have done.

I tested the cc/min of the installed #8 jet. It only pumped out about 260cc. The chart shows at 160psi should be near 460cc/min. This is indicating to me the pump could be failing.

I pulled the flow sensor housing apart and everything was free, blowing through the unit with my mouth i could feel the trigger impeller spinning. This is telling me the it either isnt spinning due to reduced pressure or flow in the line.

Next step will be to pull apart the pump head and check for signs of corrosion etc.

Other than that, i can only assume that the flow sensing circuit has failed.

Josh

[trdhilux]

Another update,

I have pulled apart the pump, haven't found any signs of corrosion in the pump, bearings etc look fine, spins freely by hand. The diaphragm looked really clean as well.

I am not sure of the anti surge unit on the outlet of the pump, whether it could have blockages etc. Is this unit necessary, i notice the later pumps don't have it.
Looks like ill need to wire in a pressure gauge and see what pressure is coming from the pump.

Is there a way to test the hall affect sensor on the printed circuit board?

Is there a minimum flow that the sensor will only work on. I presume that if i get 260cc a minute, that the sensor should read this, as with a smaller jet installed 260cc/min is achievable.

What pin on the gauge is the flow sensor trigger?

Regards

[Richard L]

the flow sensor may require cleaning. There is a filter between the tank and pump.

[SAMzG35]

I have a full hfs6 that I’m parting out. I bought it 5 years ago or longer and never installed it. When I tried to use it this year the Ethernet connectors on the circuit board are loose or something and it wouldn’t function properly. Long story short if you need any parts for the hfs6 I have a full kit to part out with.