HFS-6: Setting up the fail-safe?

[MacSTi]

I guess I have 2 questions that come out of this. The first being why was this happening when the system was turned off? The second being since I was already tuned, I am very concerned about touching a system that has already been fine tuned and possibly causing harm to a good working motor in the process. I am not 100% comfortable doing something like this when the tuner nor the OEM ECU had no control over the wastegate when the wires were hooked up. I guess I am just very nervous that I will touch something that will cause issues.

[Richard L]

When the system is turne dogg, it wil dault to low boost for safety reasons.

If you don't want this default settiing, un-link the "DHB" link so that the system does not ineterfere with your high boost pressure on the "off" position. Ensure you have a tank full of "race" gas every time the HFS-6 system is switched off.

All these questions you asked in the the user manual.

[MacSTi]

That's the thing Richard. When the unit is turned off and the wires were connected it was overboosting not low boost.

[Richard L]

I assume your car is not using the OE BCV.

Please do one thing for me, disconnect the power to the BCV and tell me if you still gets high boost. If ths is the case, there may be may hose routing mistake. The HFS6 just highlighted a serious problem.

You might argue the boost controller is wrong properly. The ECU doesn't care what duty cycle % it pumps into the BCV as long as it reached the target boost.

Let me know what happen to the boost when you remove the BCV plug.

[MacSTi]

I assume you are referring to the boost control solenoid. I have a prodrive solenoid which plugs into the OEM harness and acts like the OEM. Your asking me to unplug it and see what happens? It should revert to wastegate I assume is what you are saying.

The issue is not a hose issue because it has been working properly for the last year. It has only been a issue since the failsafe was wired into the ecu. Once we disconnected it, it worked properly again. I don't know any different way to try and explain it more clear. I wish it was as simple as here is the issue and here is how to fix it.

I mean I was also the one speaking to you from the shop Saturday and Sunday. When you called me Sunday morning I was getting ready to come home when I had the issue.

[Richard L]

I may not have explained the situation to you clearly.

Without the HFS-6 wired in ( this is your normal ECU to prodrive valve arrangment), if you unplug the harness to the prodrive valve, the boost should default to wastegate pressure -any outcome other than this - is not normal. This is regardless of how many years the system is in place and working correctly, it is still wrong.

Until you have tested this, the HFS-6's boost cut will never work properly. I am not rying to argue with you, I merely help you getting the HFS-6 failsafe working as it should.

[Richard L]

Mac,

I have done some research on the prodrive setup, here is a brief outline:

Port 1 ....... to turbo
Port 2 ....... to wastegate
Port 3 ....... vent to atmosphere

Please check you hose connections for me so that we are on the same page.

- When the BCS is in the un-energised state ............. boost = wastergate
- When the BCS is in the pulsing or energised state ........ boost is increased by ECU.

Here is where I got the information from:
1) http://forums.nasioc.com/forums/show...e+3-port+valve
2) http://forums.nasioc.com/forums/showthread.php?t=870619

Hear from you soon - I want to get your failsafe working properly.

[MacSTi]

Just wanted to update the thread. Disconnected the boost solenoid and it is flowing properly at waste gate pressure which determines the solenoid is wired properly. I will check the ECU harness wiring tomorrow to make sure the wiring is according to the instructions.

[Richard L]

Good, so far so good. Mechanically sound on the hose porting to the BCS.

Just need to trace the same BCS pulse wire all the way to the ECU and splice it there.

[Richard L]

All cleared up and working 100%. There has been just some wiring issues.