waterinjection.info - Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

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Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

No, it doesn't need to come on at all. If it does, it has reached its ceiling.

Very nice looking work!

Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

Quote:

Originally Posted by Richard L (Post 19521)

This is a good find. I was looking for BCV until I realised the car is supercharged. So this valve should work, need to know how to approach this.

Cutting the motor control wire may not work, it might just stay in the same position since the ECU is controlling the position of the flop by the two wires to the v308, based on the J808's voltage feedback.

If the voltage of J808 goes outside the 0.5 to 4.5V, the motor will go immediately to full bypass mode and drop boost.

I suggest we can intercept the feedback signal and force the flap into a more open position. This way, it might not throw a code and we can achieve our failsafe activation without having to recycle the ignition key.

There are several ways to achieve this by the HFS4. Do you have the car on your drive yet? We can start working on this.

Ok, car is all ready now, system is installed minus the failsafes. Not sure where to start with this. I have all the tools needed if i need to measure the voltages on the valve while the car is running.

Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

One step at a time, and update every stage if possible..

Can you measure the voltage of pin 2 when the idle and WOT?

Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

Quote:

Originally Posted by Richard L (Post 19747)

One step at a time, and update every stage if possible..

Can you measure the voltage of pin 2 when the idle and WOT?

Haven't had anytime to get the measurements yet. Still on my to do list.

What do you think about adding a single .3 injector pre blower? just for air cooling, would it work ok with my direct port setup? I would jut run a line off the end of the 6 port manifold where its currently plugged.

Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

There is no harm putting a 0.3 jet. Anything to keep the SC casing/gearbox cool is a plus. It will of course cooling the air as well.

The extra port on the 6-port manifold is ideal for that. An inline checkvalve would be advised if the hose is long.

Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

Hey Richard, I have inherited this project and had some more questions about failsafe.

It looks like the bypass valve that was mentioned before is just a motor and an angle sensor. Can the HFS-4 be wired to use this somehow?

https://preview.ibb.co/e8phRv/SC_Bypass_Page_1.png
https://preview.ibb.co/gRwkeF/SC_Bypass_Page_2.png
image ru

Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

I think it may work.

You need apply a 5V bias at pin 2 or disconnect pin 1. Need to experiment.

Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

Ok let me measure the voltage on pin 2. I'll see if I can manage to log the bypass from the ecu to match up.

I can also just disconnect pin one to see what happens.

Do you know what the corresponding pins are on the ECU? Otherwise I'll test continuity of whatever color wires I find.

Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

I will email it to you.

Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

Quote:

Originally Posted by Richard L (Post 23969)

I will email it to you.

Hey Richard,

Did you send me anything? I didn't see it in my email if you did.

Thanks