Re: False flow readings from flow sensor.
 

I have to to move the assembly and now its wrost here a picture of the new setup :

http://i62.photobucket.com/albums/h9...ps5e9debc9.jpg

I have try to unclip the sensor and no false reading when the sensor is unclip.

Re: False flow readings from flow sensor.
 

That is great, we eliminated one thing for now.

It that case, rotate the sensor to three o'clock and see if the ghost reading goes away.

Re: False flow readings from flow sensor.
 

I have done a quick test at idle and

12 oclock = false reading
3 oclock = no false reading so far
9 oclock = false reading

Re: False flow readings from flow sensor.
 

I believe the turbine is fluttering between the poles at certain angle and create false pulses.

How far is the jet from the FAV?

Re: False flow readings from flow sensor.
 

1 foot from the first jet (after Throttle body (check valve))
3 foot from the lower jet (after intercooler)

Re: False flow readings from flow sensor.
 

Is this problem happened recently?

Re: False flow readings from flow sensor.
 

your fav still is right on the engine mount. It will cause false readings, see pic below for what has worked for me.

http://i246.photobucket.com/albums/g...0/NCM_0017.jpg

Re: False flow readings from flow sensor.
 

after some day of testing with the sensor in the 3 oclock position I still have false reading sometime but its way better than before.

I will try to move the assembly close to the windshield washer tank but before I need to reorder some small tubing because It will be too short.

Thanks

Re: False flow readings from flow sensor.
 

The rocking of the turbine wheel in the sensor is the most likely cause of the false readings.

The turbine wheel is magnetised. Polarity flip when rotates. Producing electrical pulses from the Hall Sensor Chip inside the "C-clip."

Depending on the orientation of the turbine wheel relative to the Hall sensor, a slight movement will produce a pulse. If the position is very closed to the flipping of the magnetic poles. Slight vibration will produce false readings.

By rotating the c-clip diametrically, you can avoid false readings. Or place the FAV away from vibration.

Re: False flow readings from flow sensor.
 

bad news after reordering some tubing and relocate the flow sensor exactly where Dave80 sensor is and I still have a lot of false reading.

Re: False flow readings from flow sensor.
 

Is it possible for you to unbolt the FAV cluster and rest it on something soft and see if you see false reading. It is done on idle.

I try to establish what caused it. Mechanical vibration or electrical signal. Un-clip the sensor and see if the gauge still registers something.

Re: False flow readings from flow sensor.
 

It is mechanical vibration. I was fine with false readings until the weather got real cold here and you can feel the car vibrate more (winter time). Not spraying meth now so it doesn't bother me, but once a week I do turn on the system and spray a little to get the pump moving and sometimes get some false readings.

Re: False flow readings from flow sensor.
 

If I unclip the sensor no false reading I will try on something soft.

Re: False flow readings from flow sensor.
 

We can now concentrate on the mechanical solution.

Re: False flow readings from flow sensor.
 

Hi, do you know if this is compatible with my system :

http://www.howertonengineering.net/w...ml-m-1-8-bspp/

I think my flow sensor is defective

Re: False flow readings from flow sensor.
 

This is the correct part iof you want to have it replaced.
http://www.howertonengineering.net/h...ensor-turbine/
http://www.aquamist-direct.com/806-5...nsor-assembly/ (if Howerton doesn't have it in stock)
Or

You can send it back to me for repair. No charge but you have to pay return shipping. Airmail post is ~?10.00.

Re: False flow readings from flow sensor.
 

if its my sensor any warranty from aquamist ?

here some picture of the soft setup :

http://i62.photobucket.com/albums/h9...psf35730cb.jpg

http://i62.photobucket.com/albums/h9...ps0b663430.jpg

Re: False flow readings from flow sensor.
 

Yes, there is, it can be repaired or replaced, but you must send it back to me. What is the serial number of your controller? If is under warranty, we will repair or replace and free shipping provided we don't see any strange debris inside.

Out of warranty, we can repair free (not repairing and parts free if it is physically damaged). But you have to pay for the return shipping. Shipping via airmail is very cost effective.

You must put a statement on the outside of the package... "return to manufacturer for repair" or you will be responsible for the import tax and duty.

Re: False flow readings from flow sensor.
 

serial is 121185

Re: False flow readings from flow sensor.
 

Oct 2012 was the delivery date to Canadian Dealer.

Send the sensor back to me for closer examination. It is not easy to simulate your present situation if the sensor works as designed on the bench. It is more an operational problem rather a faulty sensor. It is quite a simple design, mechanically.

You appeared to be good with mechanical things, try disassembling and give it a clean. Make sure the sensor is vertical when re-assembling.

Re: False flow readings from flow sensor.
 

Have you got a result from this?

Re: False flow readings from flow sensor.
 

On a closing look, the FAV is held in position with a cable tie rather using the bracket supplier with the system. It can be that secure as far as vibration is concerned. Bolt on the FAV properly and see if it improves.

Putting in a new sensor will not improve the situation.

http://www.aquamist.co.uk/HFS4/FAV install.jpg

Re: False flow readings from flow sensor.
 

here a picture of my previous setup :

http://i62.photobucket.com/albums/h9...ps452fbbc2.jpg

I tie the fav to the harness away from all the vibration after you tell me

"Is it possible for you to unbolt the FAV cluster and rest it on something soft and see if you see false reading. It is done on idle.

I try to establish what caused it. Mechanical vibration or electrical signal. Un-clip the sensor and see if the gauge still registers something."

Re: False flow readings from flow sensor.
 

This is a mystery I dearly like to solve.

The soft surface test may move this forward.

Re: False flow readings from flow sensor.
 

hotshot I feel your pain man. I have been battling with this for months now and we both have gti's. I even moved the fav assembly under the rain tray where the ecu is located in our gti's without any luck. I had it running without any false readings last summer and i posted the pic of what location worked for me, but getting some false readings once again. Wondering if there is a manufacturer defect, since there was bunch of us who bought the hfs-4 kit at the same time from the group buy. Modhills from mk6 forum mentioned having false reading also. Funny thing is I didn't get any false reading for the first two weeks after the initial install. Also, I took the fav assembly apart hoping there was something stuck in there causing the problem, but there was nothing.

Re: False flow readings from flow sensor.
 

after looking at your pic hotshot the metal bracket on the fav assembly is touching the windshield fluid washer reservoir tube. That tube vibrates very much, especially with the spm engine mount you have.

Re: False flow readings from flow sensor.
 

I try another different setup its better but I still have some false flow reading from time to time.

I install another HFS4 last weekend for a friend and he got the Rev 2 and I see a adjustement for the false flow reading is there any way to upgrade to a V2 ?

Re: False flow readings from flow sensor.
 

Thanks for the update.

If the problem is electrical, we can solve it with electronics but mechanical problem has to be solved mechanically. Please tell me about your new set up.

The V2 does not have circuit modifications for the flow sensor. Can you tell me what that adjustment is?

Re: False flow readings from flow sensor.
 

my new setup is fine but Ive got some random false flow reading.

After 1 week my friend got zero false flow reading and I use the exactly same setup as me for the FAV the only difference between the 2 set is he have a V2 and I have a V1.

I think I will try to swap hie V2 with my V1 to see if the false reading goes away.

Re: False flow readings from flow sensor.
 

Can you check the pump relay is not pulsing during idling. If the 12v supply to the controller is not stable, it can make the pump come on intermittently and producing pressure pulses along the 6mm line.

Change controller and it still happens, it could be the above.

Re: False flow readings from flow sensor.
 

Hi Richard , Today I decided to try again to unplug the connector on the fav (3rd time) to see if the false reading are still there and for the first time yes even with the sensor unplug from the FAV I have false reading do my problem is not mechanical.

What do you suggest ? shield the cable ?

Re: False flow readings from flow sensor.
 

I suggest using the sensor tip end as a detector. Move it around until you track down the source of interference and route the cable around it. You will probably need a mirror by the gauge if you are going to do this on your own.

Ignition coil associated cable is the worse.

Re: False flow readings from flow sensor.
 

Richard did you ever tested the effectiveness of some kind of EMI shield sleeve over the flow sensor cable? Wondering if that would help with any interference.
http://multimedia.3m.com/mws/mediawe...ld+Sleeves.pdf

Re: False flow readings from flow sensor.
 

This is a good find. I don't know much about this but it looks good.

I don't get that many interference reports, so far I have heard a few reported since the introduction of the HFS3/4.

Re routing or rapping some grounded ali-foil seem to have solved the problem. It seemed to happen on Golfs and Minis.

Re: False flow readings from flow sensor.
 

Good source of emi shielding sleeve for people in USA/Canada is from these guys:
http://www.mcmaster.com/#emi-rfi-shi...eeving/=r085u6

Re: False flow readings from flow sensor.
 

Do you have to register before entering the site?

Re: False flow readings from flow sensor.
 

no sir. They are a very good and trusted company here in US.

Re: False flow readings from flow sensor.
 

I followed the link but was asked to log in. OOps it worked this time.

Re: False flow readings from flow sensor.
 

fixed my problem for now. Moved the fav assembly to a new spot and false reading are gone.

Re: False flow readings from flow sensor.
 

Did you use the shielding as well as relocation?