Do you pre-set a certain amount of boost like other meth kits have? Or how does it know when to start spraying? I have always wondered this.

 

The HFS-xx is fuel injector DC% triggered. If you have 0-5V pressure, MAF, TAP signal, it can also be used to trigger it. If you don't have a MAP sensor, you can trigger the system via a Hobbs switch (not supplied).

 

So where is everyone tapping there wires into? You wire in the injector duty cycle... so with the HFS-1 kit, it will start spraying at what percentage?

Then you have to wire in a trigger?

This is confusing me.

 

you get to set the turn on point. i beleive it is adjustable from 25 to 75% duty cycle turn on point.

you tap the trigger wire into the injector wire on the ecu if using IDC to be the trigger. from there you set the jumper to be IDC instead of MAP... the jumper is in the junction box where the wires all go.

 

Ahhh, ok, makes sense!

For the setup in my sig, at what IDC% is recommended or most used?

Also, is the aquamist setup on backorder? I heard that it is....

 

the turn on point is usually defined by your setup. it depends on how big of injectors you run, how much boost you run, and basically where you want the meth to turn on. i usually have mine trigger pretty high... mine turns on at 18psi about. but i've tuned some to turn on a t 10psi, and some as high as 21psi. the IDC % is pretty constant comparison to boost pressure, thats why i'm telling you in psi not in IDC. i can give you the exact IDC if you want...

 

Thanks Kevin for helping out.

The turn on point for the IDC input is between 12% to 72%.

 

What are good IDC's to use and why? What's the advantage of starting to spray later as opposed to starting to spray earlier?

I currently have an SMC kit and am thinking of switching to an HFS-1 simply because I tend to get knock during boost onset, and the thought of alky draining out of the line after the throttle plate closes is killing me!

 

I'm using a map sensor and boost pressure to trigger my setup. Whether you trigger off injector duty cycle or boost pressure, the point is..... it comes on when you basically tell it to by the programming you do.

It's confusing at first, but once you study the install instructions for a short while, it makes perfect sense. It's only complicated until you really get into the install, and then it will all make perfect sense.

 

If you want take a look at my How To for installing the HFS-5.

Chances are it will answer most of your questions. It is a sticky in the Alky section of this forum and also in my signature.

 

there are some advantages to spraying later, primarily methanol consumption goes waaaaay down. if you are triggering at 10psi on the stock turbo, basically every time you touch your throttle you'll start injection meth. if you use it often, your going to eat up a lot of methanol. if you trigger high, say 19psi, it will only really use methanol when you go WOT. i would expect a gallon of methanol to last you twice as long triggering it higher in the the boost. if you have seen Slowcars videos of the meth turn on for the HFS series, you'll see there is no buildup of pressure like in the SMC kit. the meth once it is triggered is full pressure and the spray is instant. because of this you don't need to trigger it early in anticipation of it having to build up pressure and achieve the desired spray pattern.

triggering it lower in the boost does seem to help with the low flow failsafe trigger point from turning the boost off while it is spooling. Richard does have a fix for this though...

i can't tell you a good IDC though because that is dependant on what boost you run, and what injectors your using.

 

Thanks Kevin, that's my main problem with the SMC kit, I get knock when going WOT sometimes. Usually it's when I'm at like 2000-2500rpms and WOT through the peak torque area (stock turbo), and that's really annoying. On top of that, I use NLTS and my kit keeps spraying inbetween shifts!

 

All PPS (pump speed system) without a solenoid valve has a tendency to "run on" between shifts. Some makers gives the option to upgrade. As the PPS system is very competitive, cost is everything to gain sales.

"Switch-on" delay is not as important as you can always turn on the spray a bit earlier. "Run-on" of "dribbling" is not pleasent. It is more important to ask this before making a purchase of a PPS system.