View Full Version : HFS-3 with big fuel injecters
I hope every one is doing well.
My HFS-3 Installed and adjusted by my tuner on my BT Audi B5 S4, to inject 100% meth. Running +2 bar boost, the HFS3 is not activated until it reaches over 1 bar boost, I would like to make it come on earlier, tried by adjusting the THRES but it is cranked all the way counter clock already by my tuner. Is there any thing else that can be done to make it activate any earlier?
TJ
Richard L
14-11-2012, 05:57 PM
Is your big injector low impedance?
Richard L
15-11-2012, 09:05 PM
Are you triggering the H3 with IDC or MPS?
What are the sizes of your fuel injectors? If they are very large, your duty cycle could be quite small. If this is the case, you can multiply the input by x1.5. Refer the instruction sheet came with the green harness.
Richard L
15-11-2012, 09:12 PM
Can you measure the voltage on test pin 16 relative to the "ground" pin.
1. pre-crank
2. during cranking
3. engine started and idling
4. light cruise
5. mild acceleration
6. WOT.
Are you triggering the H3 with IDC or MPS?
What are the sizes of your fuel injectors? If they are very large, your duty cycle could be quite small. If this is the case, you can multiply the input by x1.5. Refer the instruction sheet came with the green harness.
The injectors can flow 83lb @ 3 bar.
According to my tuner the system triggers with both IDC and MPS?
Are you triggering the H3 with IDC or MPS?
you can multiply the input by x1.5. Refer the instruction sheet came with the green harness.
What will multiplying the input do to Failsafe?
Will look for the instruction sheet but if in case it's lost or missing, can it be found on the net somewhere?
Richard L
16-11-2012, 08:41 AM
The injectors can flow 83lb @ 3 bar.
According to my tuner the system triggers with both IDC and MPS?
You cannot do that, either IDC or MPS. not boith. Perhaps that is the problem.
Richard L
16-11-2012, 08:43 AM
What will multiplying the input do to Failsafe?
Will look for the instruction sheet but if in case it's lost or missing, can it be found on the net somewhere?
Multiplying does nothing to the failsafe. The instruction sheet is inside the green harness bag.
You cannot do that, either IDC or MPS. not both. Perhaps that is the problem.
That's what I thought, I installed another HFS-3 my self on my other car with 630 cc injectors and have no issue with early trigger with IDC only.
Will check with my tuner if he had actually connected both IDC and MPS.
Richard L
16-11-2012, 12:43 PM
I do not have any answers for you, I can only go by what you (your tuner) told me.
Put the other controller on this car and let me know.
You cannot do that, either IDC or MPS. not boith. Perhaps that is the problem.
Just confirmed with the tuner, both IDC and MPS are wired.
I do not have any answers for you, I can only go by what you (your tuner) told me.
Put the other controller on this car and let me know.
OK, will try that too.
Richard L
16-11-2012, 06:16 PM
Just confirmed with the tuner, both IDC and MPS are wired.
He did not read the instruction, it is "either...or"
He did not read the instruction, it is "either...or"
I guess I need to disconnect either one, will do it tomorrow.
Richard L
16-11-2012, 06:51 PM
You don't have to disconnect, just remove on jumper link on the MPS slot on the HFS3 controller.
You don't have to disconnect, just remove on jumper link on the MPS slot on the HFS3 controller.
OK thanks for this. My tuner may have already removed that jumper link, will have a look.
And here is what he said when asked about if its the IDC or MPS that is wired:
"They are both wired. It may or may not use the MAP sensor for triggering unless the jumper is set to to use it, but I'm pretty sure it still affects how failsafes work, because if you turn the trigger to late and the car makes a lot of boost it will still trip the failsafe (although that could be related to something else). We've just been wiring it this way since the HFS-1 and we've never bothered wiring one without the MAP sensor to see if it makes a difference".
I hope that he can join us on this discussion.
Richard L
17-11-2012, 03:11 PM
Your tuner is correct, wired both in in case you need it in the future.
The MPS will not affect the spray or fail safe unless:
1. You set MPS to trigger the system
2. Solder link the MPS pad on the underside of the circuit board. (70% IDC and 30% MSPS)
I cannot put it more clearer than above.
Are you going to respond to my post #5 so I can see the how HFS-3 is processing the IDC signal.
Just confirmed with the tuner, both IDC and MPS are wired.
My apologies as the info that I have provided above is incomplete and perhaps misleading. My Tuner actually wired both but removed the jumper from the MPS, the system was running off the IDC only with the MPS kept as an alternative option.
Your tuner is correct, wired both in in case you need it in the future.
The MPS will not affect the spray or fail safe unless:
1. You set MPS to trigger the system
2. Solder link the MPS pad on the underside of the circuit board. (70% IDC and 30% MSPS)
I cannot put it more clearer than above.
Are you going to respond to my post #5 so I can see the how HFS-3 is processing the IDC signal.
Managed to look at the controller today and and as mentioned in the previous post the MPS was not connected. I removed the jumber from the IDC and jumped the MPS with it and went for a test drive. The system triggers earlier, around .8 bar at partial flow (half the led bars lit up) until around 1.5 bar then the flow maxed out. It was hard to be accurate due to traffic. There was no issue with failsafe.
Will respond to your post #5
Can you measure the voltage on test pin 16 relative to the "ground" pin.
1. pre-crank
2. during cranking
3. engine started and idling
4. light cruise
5. mild acceleration
6. WOT.
I shall try it in the morning
Richard L
17-11-2012, 08:39 PM
Once these IDC signal is noted, we can track down the late trigger problem.
Richard,
I had to leave town before completing the test. I'll be away until Christmas...will conduct the test upon return.
Can you measure the voltage on test pin 16 relative to the "ground" pin.
1. pre-crank : .03
2. during cranking : 0.13
3. engine started and idling : 0.10
4. light cruise: .25
5. mild acceleration: .35
6. WOT : 2.5
Finally manager to take the measurments and the results are as above in volt.
Richard L
19-01-2013, 01:29 AM
It appears you are only see 50% of the fuel flow. I suggest you put in a x1.5 multiplier (underside of the circuit board). Cur x1 and link x1.5.
After solder modification please make another measure as before for me.
You should be a much healthier signal on pin 16.
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