Usually methanol injection is just wired up kind of like a nitrous system, with a relay switching on flow at some given point (rpm or boost based usually). But for my turbo Rx-7 project I've been following the latest developments in water/alcohol/methanol injection a bit, and I'm thinking I may end up with the new Aquamist HFS-6 system which will be in production in a few months. Even though it's pretty expensive ($900 for everything I believe), it seems to have a several advantages over traditional setups.

First, just like older models of this unit, it delivers the methanol in the same way that a modern fuel injected car delivers fuel: constant pressure with a duty-cycle controlled injector. That's Bosch D-Jetronic or L-Jetronic style, the same basic shit that's on your late 80s Honda Accord Lx-i or zxappeal's old 280zx. Compare this to a "progressive" system that just speeds up and slows down the methanol injection pump. That may be better than an on/off switch but it still causes atomization issues, along with the reduced precision and response in comparison to a duty-cycle controlled setup.

Secondly, the HFS-6 has a new setup that appears to be one of the first examples of CAN architecture (not a LAN Local Area Network, but a similar CAN Controller Area Network, used in all modern cars) in the aftermarket at a semi affordable level. It uses ethernet style cables to connect the main components and transfer information digitally rather than a ton of analog wire harnesses.

Finally and most importantly, the delivery method is based on automatically compensating for whatever input you hook it into, as opposed to just an on/off rpm or boost based switch in the traditional setup. I think it still has the capability to deliver alcohol through a laptop-controlled table of rpm vs boost or whatever input you choose as well. So you can hook it into a pressure sensor, or an injector signal, or just an analog 0-5v signal from whatever device you choose.

I'll just have to wait and see how it ends up working out in terms of reliability and such. Since all 86+ rotaries use staged injectors, if I choose to base the methanol delivery on a fuel injector signal I will also have to buy an additional $120ish module to work with that staging process.

[Edited on February 14, 2009 at 10:57 AM. Reason : pics]

2/14/2009 10:41:28 AM

hang on, arghx is coming up with a 20 page response, oh wait

2/14/2009 10:50:58 AM

meth injection systems typically alter the duty cycle of a pump and not an injector?

sounds like a terrible but much cheaper alternative to this. assuming the pump is built for it.

2/15/2009 12:49:13 PM

I got all the stuff for a badass water/meth injection system. inline filter, accumulator, pump, spray nozzles, and wiring. I should do something with it

2/16/2009 12:25:10 AM

^ i think you should give it all to me

2/16/2009 12:43:17 AM

I, too, would like a digital methanol injection system

2/16/2009 9:24:05 AM

yeah, most progressive kits just alter the pressure to the nozzle.

isnt there some way you can control the meth injection with megasquirt?

2/16/2009 11:12:15 AM

^ does your Megasquirt board have an auxiliary pulsewidth modulation output like a Haltech?

[Edited on February 16, 2009 at 2:50 PM. Reason : same kind of output you would use for an IAC valve]

2/16/2009 2:47:09 PM

i still think its funny that arghx brings that 190% tech dank to this forum and yall mock him...

yep its no 455 olds

2/16/2009 7:46:43 PM

but it's in a teasing way that we mock him

2/16/2009 8:54:15 PM