New to WAI

[darwin_evo]

Hey guys,


Considering to install a wai kit... thinking of the aquamist HFS-5

Mods: full bolt'ons, fp red


Some q's:

1- considering to run 100% alky (no water), only thing i can find here is isopropanol, would this be ok??

2- wt's the max alky to fuel ratio i can run? possible to go upto 50/50?? max air flow with my setup would be 55 lb/min (probably less)

3- From what i understand, you can connect the injector signal to the HFS-5, meaning that you'll have the same alky/fuel ratio (+/- some fluctuation due to different manifold pressure) throughout the rpm range (all you have to do is pick the right nozzle size), is that right?



Plz share your thoughts/comments


Tks

[Richard L]

Originally Posted by darwin_evo

Hey guys,


Considering to install a wai kit... thinking of the aquamist HFS-5

Mods: full bolt'ons, fp red


Some q's:

1- considering to run 100% alky (no water), only thing i can find here is isopropanol, would this be ok??

2- wt's the max alky to fuel ratio i can run? possible to go upto 50/50?? max air flow with my setup would be 55 lb/min (probably less)

3- From what i understand, you can connect the injector signal to the HFS-5, meaning that you'll have the same alky/fuel ratio (+/- some fluctuation due to different manifold pressure) throughout the rpm range (all you have to do is pick the right nozzle size), is that right?

Plz share your thoughts/comments

Tks

Thank you for considering Aquamist.

Answers to your questions in brief:

1- If possible avoid isopropanol, I read this article that this alcohol is not good for this application. If methanol is not available, try de-natured ethanol from: http://www.brenntag.be/ (Belgium)

Article about iso-P.
http://enginehistory.org/Frank%20WalkerWeb1.pdf

2- It is possible to run to 30% without too much mapping problem. Beyond this, you need a full blown ECU to manage the alcohol. plus return ti tank pressure regulator.

3- Yes.

[darwin_evo]

Tks for your prompt reply,


1- I read some of the article briefly. As I understood the prob was that the iso-p made the mixture too rich... the guy was using 50/50 mixture, maybe in my case (70/30) that won't be a prob, or maybe since i can control the afr I can overcome it... nyway i guess i'll try iso-p first then go for denatured ethanol... If anyone already tried using iso-p plz share your results.

2- I've read that when using the HSF-5, smallest injectors needed are to be used in order to take full advantage of the valve. Let's say I chose my injectors in such a way to have 85-90% duty cycle, would that mean i can go beyond 30/70 mixture??

3- Since you can only go 30/70 with wai kits, and you can go like 20/80 if you mix the alcohol with your fuel in the tank, would it make sense to buy a wai kit for only 10% more in the mixture??

Tks again,

[Richard L]

1- Open to any new ideas. I like to be clear between WMR and WFR:
- WMR (Methanol to Water ratio): anything from 0-100%
- MFR (Methanol to Fuel ratio): up to 30%. Over this ratio, you need to write your own ethanol map, driving the HSV directly. Mirroring the fuel IDC will be tricky to remap.

2- Matching the water jet and restrictor combination allows you to tighten the linearity of the mirroring algorithm.

3- Please clarify 30/70, are you referering to WMR or MFR?

[darwin_evo]

Hey Richard,


What i meant is methanol to fuel ratio, since I already stated that I'll be running 100% meth.


Plz tell me if the below is true:

Let's say I want to run 30/70 MFR. Alky's are like 30% lighter than fuel from what I read here, accordingly a 30/70 combination by mass would require 43% cc's of meth (43% of the total fuel cc's).

ie: using stock injectors, 4x560 = 2240 cc's
meth required to run 30/70 MFR: 2240x43% = 963 cc nozzle (w'out taking account of the manifold pressure reducing the meth pump flow)

Now if i want to run 50/50 MFR, why doesn't the above logic apply??

I hv no prob programming a microcontroller to generate my own PWM based on the RPM and boost in case this is required to run a 50/50 MFR, but I need to know the reason why I can't just mirror the injectors duty cycle for above 30/70 MFR.

[Richard L]

OK, 100% meth.

Density of Mathanol 0.79 and fuel ~0.75, about the same. Water is 1.

The same logic applies for M50:F50. I was confused with M/Water mix before. You can certain mirror the fuel IDC.