[Diy_efi] PW Controlled Sequential Water Injection - It RUNS!

[David Cooley]

 the MPG improves because you can:
A. Lean out the cruise mixture without fear of detonation and
B. the water injected replaces some of the fuel in the mix, so less fuel per
volume of air is required
 
 
-------Original Message-------
 
From: A list for Do-It-Yourself EFI
Date: 10/21/04 08:43:51
To: A list for Do-It-Yourself EFI
Subject: Re: [Diy_efi] PW Controlled Sequential Water Injection - It RUNS!
 
Hi Daniel,
 
Would you have some pointers at explanations about cruise mpg
improvement ?
 
Alexei
 
 
"Daniel R. Nicoson" wrote:
>
> It ran. I'm happy and celebrating with a bowl of vanilla ice cream & Oreo
> cookies and a Mt Dew.
>
> I ran it tonight for about 15 minutes, only a few leaks to fix and a
> pressure gauge to wire up Saturday AM. Hopefully dyno time over the
> weekend. I can't claim any blazing performance improvement based on
> tonight's run. I still have to load the appropriate tune into the EEC to
> take advantage of the system. The EEC Tuner list was helping me with that
> tune today.
>
> What is it?
> 8 separate 14# injectors with their own "water feed rail", water pressure
> regulator referenced to intake vacuum (actually a 1994 Mustang 5.0 fuel
> regulator), a 6 gallon supply tank in the trunk with a Sureflo diaphragm
> pump. Water flows up to the feed rail through your basic 300 psi air
> compressor hose and the return flow through the same. I built an analog
> controller that is triggered by the respective fuel injector pulse width,
> the water injector is delayed a set amount of time and then fires for the
> remainder of the pulse width. This delay is adjustable giving me the
> ability to change the percentage of water injected. I have 30# fuel
> injectors. I also use the EEC Tuner which gives me full control over my
> fuel tables and spark tables. The injector drivers are proper P & H if I
> ever need to run lo impedance injectors. Right now just running Crown Vic
> 14# high impedance injectors.
>
> What's it supposed to do on a NA 1994 5.0 Mustang?
>
> Two things, provide detonation resistance at WOT (two T-3 turbos waiting
for
> an install...) and POSSIBLY improve highway cruise mpg.
>
> Theory:
>
> WOT operation you guys all know. Cooler intake charge; also water replaces
> the extra fuel normally used to cool the cylinder during the combustion
> event. I'll be experimenting with pretty lean mixtures at WOT (13:1 even
> 14:1 AFR).
>
> Highway cruise. Based on some WWII research reports - they were running up
> to 50 parts water to 100 parts fuel at high load, achieving great power
> gains AND achieving about 10% improvement in efficiency. My thoughts were
> that 50% water at low LOADs probably would be too much but if I built the
> controller with some adjustability I could EXPERIMENT and see if a lesser
> amount of water would help at highway cruise.
>
> Most of the ideas I used were from you guys on these lists. A lot of
people
> from various lists have contributed. I think we started discussing pulse
> width controlled sequential water injection back in July 2003. I've been
> working on it ever since. I had to learn all about the electronics and
> spent most of this 15 months getting all that working right. My wife jokes
> that I could open a Radio Shack store with everything it took to finalize
> the circuit (most of it came from Mouser and Digi Key). The fabrication to
> mount the extra injectors under my Trick Flow manifold took over a month.
> The feed rail is welded stainless steel (Dustin where I work is a wizard
> welder!). The wiring harness in the car was a LOT of work.
>
> This is an EXPERIMENT! Eventually I will write all this up, post some
> circuit diagrams etc. Right now I have about 30 days before the snow shuts
> me down, I want to get some data during that time. I am also concerned how
> long the injectors will last. I ran straight water tonight. After the
> leaks are all resolved, I plan to run 80% water & 20% methanol that has 1
oz
> of Klotz - Uplon fuel lube per gallon of methanol. The Klotz is supposed
to
> provide upper cylinder lube for alcohol fueled vehicles AND provide rust
> protection for the fuel system. My only corrosion concerns are the
> injectors, pressure regulator and pressure sensor. Everything else is
> stainless, rubber or plastic (boat fuel tank).
>
> Its an EXPERIMENT, I'm having fun! Worst part is I'll be traveling for
work
> the next two days and won't get back to the project until Saturday AM.
>
> Fire away!
>
> Dan
>
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