Water injection

[cage]

Boring!?

[hybrid]

So what pressure are you thinking of running the fluid line at? 1 bar or more?
Is it going to be boost regulated? (assuming no from parts listed).
How about a bottle empty warning light?

It will be 60 PSI to start with (so a bit less at the nozzle under boost).
Hobbs switch only for now. I may change it later depending on how it goes.

No Warning light yet - I don't want to run any more wires into the car for now. Maybe later.
But I'm going to configure the MAT retard table so if there is no water left, intake temps will rise and I will pull the extra timing out that I will dial in with once the water injection is up and running.

Cage... hows that busted suspension going?

[cage]

Boo to you Hybrid.

[boofhead]

mat retard good idea.

cage - lol

[hybrid]

Forgot to mention. I have been trying to research which washer fluid in Aus might contain methanol. I haven't been able to find any info at all.
It might be because the methanol is generally used in cold conditions which we don't really see in Aus. We're more likely to have soapy stuff here.
So I'm starting to think I'm going to just buy distilled water from bunnings. And if I want to add some alcohol as well, I'll just mix in some metho, which should be mostly ethanol.
Ethanol doesn't soak up as much heat as methanol, but it's still pretty good.

[boofhead]

50:50 mix of meth:water is best because you get temp suppression plus timing advance benefits. Water alone provides cooling only no timing change as no small octane change.
Use methanol - careful with other forms of fuel.


http://www.enginebuildermag.com/2012/02 ... injection/

http://powerplusfuel.com.au/shop_produc ... product=60

http://www.australianchemicalsuppliers. ... h=methanol

[hybrid]

Plenty of people have used Metholated spirits (known as denatured alcohol in the states).
http://www.alcohol-injection.com/forum/ ... hanol.html

Cooling effects of water on the intake charge (and cylinder temp) alone lets you increase ignition timing, so you don't HAVE to run alcohol.
But you can push harder with a mix.

Really at 6lbs boost, I'm not trying to set the world on fire.

[boofhead]

I was hoping you would then consider going to 12

[hybrid]

I was hoping you would then consider going to 12

When my warranty runs out it's an option. I was going to change over to a billet impeller first, which will allow more RPM.
https://928motorsports.com/parts/paxton_impeller.php

I can probably work out what my current impeller RPM is. I've never calculated it.

[hybrid]

6.88" crank pulley and 3.7" on the charger.

So that's 1.86:1 drive ratio (not much really).

13,000 RPM shaft speed at 7,000 RPM
Internally geared at 3.54:1

So that's 46,090RPM impeller speed at 7000.

The max impeller RPM is 53,000.
The 928 pulley would let me go to 60,000RPM.

[hybrid]

3.25" pulley would get me to the max of the stock impeller
52,500 @ 7000RPM

2.87" pulley would get me to 59,400RPM @ 7,000 if I was to upgrade to billet impeller.

[Husky65]

You can get an 8" crank pulley I think, chuck that on with the pulley you have now and see how it goes. That would put you right at 53000 rpm at 7k. Just shift at 6 and you'll be sweet
Are you shifting at 7k, or just using that for your calcs?

[hybrid]

Crank pulley is much harder to change (and more expensive).
I would be shifting more like 6000 or so, but I bumped up my rev limiter to 6500 I think because it was hitting the limiter before I crossed the lights at the track.
So 7000 was just a safety thing for the impeller really. They may have some safety factored in to their 53000 limit too - not sure.
Because I was being cautious with my RPM, I have decided to go for a 3" pulley instead of 3.25".

I have most of the parts for the water injection now except the water tank, but hopefully that will arrive this week.
I've decided on this style:


Unfortunately, it happens to be a direct replacement for multiple h*lden vehicles, but it will also fit the spot I have cleared perfectly.
I will modify it to supply both my windscreen washer and the injection pump.

The nozzles arrived. They're much smaller than I was expecting, though I don't know why I was expecting bigger.
I found a 1/8" NPT fitting in my spares (thanks to beginning my garage cleanup/organisation) that I will use for the nozzle.


I drilled the centre out so there was enough room for the screen plus some area around it for water flow.
I only drilled far enough in to reach the first couple of mm of screen so as to keep as much strength in the fitting as possible.
My last cut was with a 7mm drill.

[boofhead]

I used a similar one for water bottle in my mustang.

Good update.

GBX - look 3inch pulley - you need multi-stage nitrous now...

[Husky65]

3.7" to a 3" pulley change is gonna be very noticeable ha ha....good stuff!