HFS-3 not spraying ::mystery solved::

[Richard L]

Looks like it is working now?

[sniper]

work!!!
I made a few data log

THRES: 11.00
AN6 pink= 0V-0% 5V-100% (Flow sensor signal: 0.5 to 4.5V)



THRES: 10.00



failsafe activated
BKSW green= boost on/off

[sniper]

I add some upgrades

[Richard L]

Amazing soldering work. You now have all the options.

I notice an over shoot on the flow signal. If you can shorten the line between FAV and jet, you can minimise this effect.


What jets are you running?

[sniper]

final setting
THRES: 11.00
GAIN: 12.00 default
FS-DL: 12.00 default
WL: 10.00
SC: 13.00
WH: 14.00

Jet size: 0.4/0.6
0.9mm restrictor ................... 0 - 1080cc/min

Jumper link: default
HFS-4 flow sensor map: solder link 1-2
IDC pre-amplifier gain: x2.5

[Richard L]

Is this system setting working well for you. If you would like a greater linearity you can request a "lower" flow valve or go for a smaller restrictor.

[sniper]

Richard
All jet are tied to the parameters detonation
If I have a detonation, my changes are as follows:
jet 0.6 / 0.6 (0.8)
0.9mm restrictor delete

Currently
Is this system (Jet size: 0.4/0.6) working good

[Arthurwiljami]

Originally Posted by Arthurwiljami

Finally got the car running with a little wastegate duty cycle and the roads are not icy anymore. Only thing I've adjusted since last time is I turned the threshold from klock 9 to 10 so it would trigger the spray later AND IT WORKS WL/WH is still in end positions but the main thing is the system is working.

I'm not sure what was the trigger that activated the failsafe before. Basically it activated before it even got to start spraying so I quess it was just spraying too early even the IDC wasn't that low.??

I want to thank you Richard for all the support you've given. The whole installation/adjustment has been full of mysteries and things have worked the way they shouldn't or just differently compared to other Audi S4's and this made it more than challenging.

Hopefully this thread isn't going to be re-reopened

Thanks

Thread bump from the grave.

I'm having same failsafe issue again after changing injectors 840cc to 1080cc. Adjusted threshold from 12 a clock to 10 since IDC dropped but no effect. Still don't see leds in the paragraph display.
How/what do I need to adjust to get this to spray again?

[Richard L]

What is your maximum duty cycle on the new injectors?

You may need to use x1.5 instead of the x1 is you are not using full duty cycle.

[Arthurwiljami]

Need to check the max duty but I believe it is below 60% at this point it tuning. What do you mean x1 to 1.5x? I remember reading something about scaling in some other thread but can't find it in the manual.

In the meantime;
I'll be using pump fuel and E85 so my duty will be varying a lot depending which tune I'm running so was thinking of changing to MAP sensor control. I have the blue wire from the gray harness connected to oem MAP signal but my circuit board looks like this MPS/IDC?
https://www.dropbox.com/s/9jy271vhgk..._0447.JPG?dl=0