So because of the upcoming hot summer days and the beauty of Nefmoto flasher combined with Win0ls for tuning ive decided to put together a basic WMI kit. Since I am on a budget with this upgrade its going to be running off a boost pressure switch instead of those fancy expensive progressive controllers that I seen alot of ppl using. Anyways before I start my install I was hoping i could hear from you guys running meth on acouple things.

1st "noob" thing im scratching my head on is what is a good reliable 12v ignition switch source that I could tap into to get my system running properly on my a4 1.8t b5? I thought about using the wire right behind my ecu harness but i really dont want to start hacking up the wires that runs the most important part of my car.

Now when its all set up and running I plan on taking logs and safely tuning timing in the areas that could use it via KFZW/KFZW2 as far as i read on here. Are there any other things i should be looking at? Thanks 

That way of wiring seems simple enough and ill probably end up going that route. Out of curiosity tho if the pressure switch acts as an on/off switch couldn't it just run straight to the battery with a fuse because itll only activate once it see's desired boost? or do i run the risk of burning out the switch itself from constant power? idk im prob over thinking this because its been raining the past couple day and i haven't got around to installing it yet.

On another note I have seen both of those methods of tuning for meth but im still on the fence on how im going to go about?
if anything im only going to be changing timing in the higher loads/rpm. With my novice logic with tuning me7 im going to leave lamfa they way its set up on pump because majority of my power band is going to be spent without Meth.

Prj,

I'd love to have map switching on my car though I don't know how to implement it. I know it doesn't seem easy but I'm willing to spend the time learning. Do I need to get familiar with finding ram locations within a file first? And if so what software is best for helping me do this?

Meth is the only reason why I'd need map switching, not sure if only needing to be able to change kfzw makes life easier in terms of implementing the map switching or not?

Previous to this I was just going to install a tank level sensor and tune to 3 degree timing corrections then add meth but I would like to properly take advantage of it with more timing. I plan to use a microcontroller connected to a MOSFET and control the duty cycle of the pump to increase as boost pressure increases so I get more meth with more boost

You can implement it through CNOKT, but if your engine is highly tuned and already near to component limits then this won't help.
By the time it reacts and the boost gets pulled down enough there is a high chance you have bent a rod or done other damge.
Not to mention it will do this over and over and over again, because it will knock every time. It will also cause runaway knock because the knock will be so severe that it won't be able to pull enough in time.

When I get +100hp from meth, I usually have a lot higher boost and up to 8-10 deg more timing...

Hence why I said - either run a small jet and don't bother mapping for it, or do it right.
As for implementing mapswitching yourself - good luck. If you do not have experience with assembly and coding or microcontroller development, you are better off paying someone to do it for you.

Complete waste of time. Pressure does not equate to how much WMI flow you need. You will just have huge consumption and the engine will bog down in the midrange if you actually run enough of it to make a big difference, as you will have the same amount at 4000 and 6000 rpm, whereas engine flow is significantly higher at 6000 rpm.

There is one system that does everything right:
http://www.aquamist-direct.com/806-063-hfs3-v3-1-system-a-truly-progressive-system-utilising-pwm-valve/
PWM IDC tracking, map switch output etc.

Everything else I have had the displeasure of working with has been quite bad.
What you are describing is not worth the hassle. Just save up some money, install Aquamist, buy a map switching solution and do it right the first time.

That's how I did it (minus buying the solution, as I write them myself), and that's how I do it for customers.

P.S.
I am not saying this because I want to sell you anything - I am just saying how it is. I have been installing WMI systems for years now.

The first time I worked with Aquamist it was such a pain, but once I understood how it worked and how poorly it had been installed it all made sense
and I will also say it worked quite well.

Thanks for the reply Prj.

I think I jumped the gun so to speak, after seeing lots of kits activated by boost pressure. Now you corrected me I can see it was a silly idea. I imagine that aquamist

I realise that kit will be a lot better than one I may be able to make, however I would still like to make one. I have purchased a small nozzle. I could see that most of the kits are quite crude and literally supply X amount of water meth once a set boost level is reached. I'm hoping to use it for a university project, so even if it doesn't make it to my car it would be nice to make so thanks for the point in the right direction.

I will most likely buy the aquamist kit as it looks like really good value - and then be looking for someone to purchase a map switching routine from for my ECU (032TL ME7.5)

TorqByte has the best setup I've come across for building components of your choosing around the controller, and the capabilities of the controller software are excellent.

WMI is magic.  I gained at least 40whp on my 1.8t frankenturbo with WMI and proper tuning.