HFS-4 Q&A, application for your engine...

[Richard L]

Anyone wants to discuss how they can make best use of the HFS-4, please post here. There are so much more the H4 can do. Please specify makes, model and power target.

[monkiboy]

Originally Posted by Richard L

Anyone wants to discuss how they can make best use of the HFS-4, please post here. There are so much more the H4 can do. Please specify makes, model and power target.

hi richard - thank you for your tremendous customer support.

i just signed up for the GB for the HFS-4 and a dual tank enclosure.

i have a 2008 usdm subaru wrx making around 450whp on pump 93 and plan on running 50/50 to see what more i can extract from the setup.

what suggestions do you have for my installation or tips to best take advantage of my new HFS-4?

thanks, again!

[Richard L]

This is very straight forward.

I have spoken to Cobb, they are very happy to cut boost as a fail safe until something more refine comes up. At present they are working on a meth map, based on the HFS-3. A HFS-4 will be with them in the next few days. Depending on their work load, they will run it. I also believe one of the Cobb shop is installing and tuning a HFS-3 based 335i. The HFS-4 is backwardly compatible with the HFS-3 as far as Cobb is concerned.

We will publish a generic H4/Cobb wiring diagram before the end of the GB.

The HFS-4 is now equipped to work with Procede (any version) and BMS JB4. It has a "RAW pulse" and voltage output to represent meth flow to work with their failsafe input.

Which Cobb maps have you tried so far?

[maxman]

Originally Posted by Richard L

This is very straight forward.
I have spoken to Cobb, they are very happy to cut boost as a fail safe until something more refine comes up. At present they are working on a meth map, based on the HFS-3. A HFS-4 will be with them in the next few days. Depending on their work load, they will run it. I also believe one of the Cobb shop is installing and tuning a HFS-3 based 335i. The HFS-4 is backwardly compatible with the HFS-3 as far as Cobb is concerned.
We will publish a generic H4/Cobb wiring diagram before the end of the GB.
The HFS-4 is now equipped to work with Procede (any version) and BMS JB4. It has a "RAW pulse" and voltage output to represent meth flow to work with their failsafe input.

Which Cobb maps have you tried so far?

So far with my mods I have been using Stage 1 aggressive. Cobb has said that a Stage 1+ is in the works (to take into account the upgraded FMIC) but it has not been released yet.
Cobb Stage 2 and Stage 2+ require upgraded downpipes and I'm stock in that area.

[Richard L]

Originally Posted by maxman

So far with my mods I have been using Stage 1 aggressive. Cobb has said that a Stage 1+ is in the works (to take into account the upgraded FMIC) but it has not been released yet.
Cobb Stage 2 and Stage 2+ require upgraded downpipes and I'm stock in that area.

In any case, the HFS-4 is well equipped to tackle any goodies forth coming from Cobb.

[Richard L]

Originally Posted by monkiboy

hi richard - thank you for your tremendous customer support.

i just signed up for the GB for the HFS-4 and a dual tank enclosure.

i have a 2008 usdm subaru wrx making around 450whp on pump 93 and plan on running 50/50 to see what more i can extract from the setup.

what suggestions do you have for my installation or tips to best take advantage of my new HFS-4?

thanks, again!

Do you have a FMIC? I assumed you do. Please make sure the two jets (yes two) is placed as far away from the throttle. 3-6" apart is perfect. This promotes better mix and allows more time for the droplet to perform inlet tract cooling.

The reduced droplets will give better cylinder distribution so you don't have to tune to the cylinder with least water whilst the others are over cooled.

The HFS-4 has three MAP sensor input definitions, absolute, 2 bar and three bar. It converts any two of the latter MAP sensors signal from "atmosphereic to boost" to 0-5V.

This is useful if you want to want to balance the meth flow between idc and boost (vacuum is nulled out).

50/50 is a good starting point.

[okswerve16]

Thanks for the support! I signed up for the group buy, I plan on running the HFS-4 with direct port injection on an audi a4 fsi motor is there any new info that I will need for install verse your older systems.

[Richard L]

Originally Posted by okswerve16

Thanks for the support! I signed up for the group buy, I plan on running the HFS-4 with direct port injection on an audi a4 fsi motor is there any new info that I will need for install verse your older systems.

Is there a reason why you are going for direct port?

I was more concernng about the reaction time of the meth delievery. There is delay due to having to purge the air out and to refill a network of hoses due to the syphoning effect of engine vacuum.

If the direct port is being used for suppliementing the lack in capacity of the FSI injectors for high power application, than the installation is quite straight forward. You won't need to trigger the system until mid to high load. Delivery delay is no longer of any concern if you trigger the system slightly earlier.

But if you commencement of the injection id from low to mid load, the delay will affect the smoothness of the delivery because theere isnlt much time between refilling the hoses and spraying. Under this conditions, you must add four checkvalves behind each jet to stop the vacuum from syhoning the fluid out of the hoses.

Here is a link to such as example:
(see a small checkvalve is inserted behind each jet.

http://www.aquamist.co.uk/vbulletin/...p?t=781&page=3

For long term trouble free operation, good filtering is essential.

[okswerve16]

Originally Posted by Richard L

Is there a reason why you are going for direct port?

I was more concernng about the reaction time of the meth delievery. There is delay due to having to purge the air out and to refill a network of hoses due to the syphoning effect of engine vacuum.

If the direct port is being used for suppliementing the lack in capacity of the FSI injectors for high power application, than the installation is quite straight forward. You won't need to trigger the system until mid to high load. Delivery delay is no longer of any concern if you trigger the system slightly earlier.

But if you commencement of the injection id from low to mid load, the delay will affect the smoothness of the delivery because theere isnlt much time between refilling the hoses and spraying. Under this conditions, you must add four checkvalves behind each jet to stop the vacuum from syhoning the fluid out of the hoses.

Here is a link to such as example:
(see a small checkvalve is inserted behind each jet.

http://www.aquamist.co.uk/vbulletin/...p?t=781&page=3

For long term trouble free operation, good filtering is essential.

Richard, that is exactly why I want to use direct port to supplement the injectors and their lack of flow. Since there is no flow data for the injectors I will be using (rs4) how can I calculate nozzle size? Also since I am going to use the 1-4 splitter I will only need one filter before the splitter correct of what size micron? TIA!!

[Richard L]

Originally Posted by okswerve16

Richard, that is exactly why I want to use direct port to supplement the injectors and their lack of flow. Since there is no flow data for the injectors I will be using (rs4) how can I calculate nozzle size? Also since I am going to use the 1-4 splitter I will only need one filter before the splitter correct of what size micron? TIA!!

In that case, setting the system up is a lot easier.

There are two options on the filter front.
1. We manufacture a high pressure 130 micron inline filter (Picture below)

2. It is poossible to supply a jets with a 25micro internal filter. But it is only available on a 0.3mm jet. flowing about 100cc/min. We can put the same filter in a larger jet but the filter and clog up within a few months unless you put another 30 micron between the tank and pump. (pictiure below 2/3)

3. The HFS-4 comes with an in-tank 112 micron filter (picture 4/5)