System will not trigger from IDC

[crum86]

Got a HFS3 V2 in my car which was running fine with the old EMS8860 engine management. I have since changed to a Haltech PS2000 but I can't seem to get it to reach the injection threshold, even with the dial turned right back. The IDC led is flashing so it is getting an injector pulse of some sort. I'm running 6 x low impedance 750cc injectors (2.2ohm) if that makes any difference and I'm fairly certain the ecu used a peak and hold driver. Impedance can be selected in the ecu and there are no resistors wired into the loom. The signal is wired up through the green wire on the grey plug and red is to a ign source.
I've noticed a couple of posts about cutting and soldering links on the board. Is this something that I will need to do or should I try wiring in the green harness as I've noticed in later versions say to use this for peak and hold?

[Richard L]

Got a HFS3 V2 in my car which was running fine with the old EMS8860 engine management. I have since changed to a Haltech PS2000 but I can't seem to get it to reach the injection threshold, even with the dial turned right back. The IDC led is flashing so it is getting an injector pulse of some sort. I'm running 6 x low impedance 750cc injectors (2.2ohm) if that makes any difference and I'm fairly certain the ecu used a peak and hold driver. Impedance can be selected in the ecu and there are no resistors wired into the loom. The signal is wired up through the green wire on the grey plug and red is to a ign source.
I've noticed a couple of posts about cutting and soldering links on the board. Is this something that I will need to do or should I try wiring in the green harness as I've noticed in later versions say to use this for peak and hold?

The standard injector input on the grey harness will not read low impedance injectors. You need to use the green harness. But the earlier version of the V2 may not read it properly without returning back to factory for free upgrade. What is the serial number of your V2? You will also need to modify the bottom of the circuit board to active the green harness input.

[crum86]

Hi Richard heres a pic of the board. Hopefully it won't need sending back as I'm in Australia. Just noticed the cel jumpers is missing. Will that effect anything at all?
I'm wondering if the injector drivers are slightly different between the 2 ecu's as the system ran perfectly with the same low impedance injectors

http://i1278.photobucket.com/albums/y514/crum86/20150623_111319_zpsvlr5pjpk.jpg

[Richard L]

The board was made in April 2012, not compatible with low impedance injector or DI injectors. 7 months on, we upgraded the controller to read lo-imp and Di injectors. We also supplied a green harness for the user port.

In your case, you need to send the controller back and purchase a green harness. There is no charge for the upgrade but you have to pay for the return shipping and purchase the green harness at www.aquamist-direct.com

[crum86]

Ah bugger. Was hoping I wouldn't have to send it back. It did come with the green harness so is it worth trying?

Will it just need to be sent to the address on your contact page?

[Richard L]

If it comes with a green harness, it is worth trying, it was probably a beta period. October was the official green harness launch.

Here are the steps:

1. Wire the red and green wire of the green harness across the fuel injector directly.
2. Cut PWM- and solder link "CUST" on the under side of the circuit board.
3. You still need to connect the red wire of the grey harness to the 12V supply to fuel injector (+)

Question: do you use a resistor pack with the lo-imp injectors? If this fails, I will pm you my address or at the back of the user manual.

[crum86]

Cheers for that. Fingers crossed it works.

Not running any resistor packs as the impedance is definable in the ecu and I'm running individual outputs

[crum86]

Looks like I have had a win. Seems to be activating now. One question though. I wound the thres trimmer back and it is activating at idle with 0% throttle before it is fully counterclockwise. I haven't road tested it in the preset 12 o'clock position but should it be that sensitive?

[Richard L]

A few of the Betas did have this over sensitive issue. If you are good at soldering, replace just one component. I can tell you what to do. The component involved is super tiny. 1.6mm x 0.8mm.

[crum86]

Definitely keen to give it a go. Got a bit of gear at work which shouldn't make it too difficult

[Richard L]

Here it is:

http://www.aquamist.co.uk/forum/DI.jpg

[Richard L]

let me know the result.

[crum86]

Thanks Richard. Will let you know how it goes

[crum86]

Looks as though it has all been successful. Takes a few rpm to get it triggered with the trimmer fully counterclockwise but I'd say this is due to the largish injectors (750cc). Should I use the 1.5x multiplier to get it to trigger a little earlier as I'm only at around 24.5% idc at 8psi boost. I don't have the actual duty cycle data logged but used a calculator that uses ms and rpm to come up with the % figure. I did have to turn the trimmer back to get it to start injecting at 10psi. Is there a typical boost pressure to use for a starting point or does it change with individual vehicles?

Also am I able to data log from the aquamist if I wire it into one of the ecu's inputs? I noticed in a couple of other threads where a yellow wire was mentioned for this.

[Richard L]

Never tired of hearing success stories! You must have very skilful soldering techniques.

Yes, x1.5 is essential if you are not using all the capacity.

Just connect the yellow wire to the ecu input. Here are the signal configurations:

0 to 0.5V ............... reserved for sensor detection
0.5 to 4.5V ............ flow signal (conditioned by the SC trimmer on the gauge)
4.5 50 5V ............. sensor malfunction signal.

You flow log will be between 0.5V to 4.5V

[crum86]

Thanks for the help Richard. Will change to the 1.5x multiplier and road test it as soon as I'm able to get access to the car again.

Just waiting on a reply from Haltech in regards to setting up a data logging input but it's good to hear that it is possible with the aquamist unit.

I'm really keen to finally get a water/meth tune done in the car now

[Richard L]

Not many people use these signal, shame.

[crum86]

Quick question to revive an old thread

I have since changed to high impedence injectors. Will the resistor I fitted need to be removed again or will the system work properly with it still in place?

[Richard L]

same resistor