HFS-3 on BMW 535d
 

Hello!

I am from a small country called Estonia.
So i ordered myself a aquamist HFS-3 kit. I am planning to install it on my E61 535d. Right now its tuned to max with stock turbos and everything. Next logical step in my mind was water/meth kit.

I have a few questions about it. How is the injection going to be controlled? I understood that there is a possibilite to control it via fuel railpressure. It should work then with railpressure sensor? What wires i do have to connect there then? I have looked at HFS-3 diagrams, but still a bit confused. I would be very thankful if someone could draw a simple diagram etc.
Also, how or from where i should setup failsafe? And what size nozzels i should use, and 2 nozzels or install 3?

Best regards,
Kert

Re: HFS-3 on BMW 535d
 

The HFS4 aquamist systems reads idc and rail pressure. Boost pressure is only used for correction.

For diesel, M50/W50 injection, it rarely needs failsafe as: No flow = loss of power = failsafe. All aquamist system has a flow sensor based failsafe. It will depend on you how you want it integrated if you run water only.

Is the boost pressure controlled by a BCV on your engine?

Re: HFS-3 on BMW 535d
 

There is a good tuning company in your country who is specialise on the disesel systems, see below. Give them a call.

Dmitri Danilkin
ESRacing OÜ
Mureli 5
Tallinn, 10617
Estonia
Phone Number 58818336

Re: HFS-3 on BMW 535d
 

Thanks for your replies. Yes my engine has a boost control valve. And first i think, i am going to use windshieldwater, so then it is going to be about 30/70 mixture.
I already consultated Dimitri at Esracing. He recommended me to order HFS-3 kit, and said, it can be easily controlled via railpressure sensor. More information was not coming from there :D, he offered that they could install the kit by them selves, but the price was almost another HFS-3 kit, so it would not be reasonable to pay 400+ euros for a work what i could do myself with one night.
So just i need to know where i should connect rail pressure sensor?
When to look at the diagram, there is a injector +/- at user port and also at ECU port. Do you have to connect railpressure sensor + and - to one of them?

https://farm5.staticflickr.com/4323/...39e6a56c_b.jpghfs3 by Kert Reinhold, on Flickr

Re: HFS-3 on BMW 535d
 

Use the aux or map sensor (more major role) input.

Re: HFS-3 on BMW 535d
 

Map sensor i understand and know what wire i have to connect to the blue wire form pin ECU. But what is the yellow AUX wire for? Where should it be connected? And green wire goes to injector - ? May i also connect it to railpressure sensor m - ?

In that case, user pin wires i just leave empty?

Sorry if my questions are a bit foolish, but i have never dealed with water/meth injection, so i want to make it clear to me, so there would be no errors if i start the installment

Best regards,
Kert

Re: HFS-3 on BMW 535d
 

The yellow wire is for a third load signal, affect +/- 15% of the final injection %. It is rarely used.

Re: HFS-3 on BMW 535d
 

Then i just leave the USER port alone. Connect ECU port green wire to car injector - wire, red one to injector + wire, and blue wire to MAP sensor + wire?
Am i correct now? And thats it, system should work?

Re: HFS-3 on BMW 535d
 

if you are using the fuel injector signal on the green wire of the grey harness, you need to modify the underside of the circuit board to detect PWM (+). Cut and solder.
Also link the MPS.

Post a picture of your ECU so I can confirm the correct wiring.

Re: HFS-3 on BMW 535d
 

you really should have purchased the HFS4.