14psi on 4agze

[takai]

Yup agree with Hen. I know of several gzes which have been thrashed all day every day at 14psi with no issues whatsoever.

[LO01UX]

Awesome now just gota wait for the crank and cam pulleys to come from the states n its fun time

[NME308]

I was actually just thinking bout water injection, how well does it work?

Awesome!

For charge cooling methanol/alcohol gives best results and supports highest power.
For detonation suppression water gives best results with some cooling benefits as well.
Most racers will use a 50/50 mix of water and methanol for safety and power.

The theory goes that the finer the particles you introduce to the intake tract the better the results due to better atomization etc. In practise bro and I use a nitrous plate under carb for introducing 50/50 water meth to approx 1/3 petrol volume. Although our system is assumed by experts to be clumsy the practical results are safe 1000hp from 350 cube V8 with water meth working vs melted plugs when some doughboy (me) accidentally disconnected the wrong wire and disabled it...

If you were to introduce water meth say from 10psi that should give you a fair margin of use punting around semi normally without needing a 2nd fuel tank for the stuff!

Steps off soap box!

Cheers,
Jason

[LO01UX]

Ok sweet, so how would I rig it up for the gze?

Like have a small injector rigged to spray at a certain from a certain rev range or sumthing?


By the way thanx everyone for your help and input especially terra, hen and feral cheers boys

[NME308]

You could be as crude as 10psi hobbs pressure switch activation, cheap low pressure fuel pump, mechanical methanol injector(s), and one way valve to prevent syphoning. Spray in front of SC. Activating from 10psi should mean you will not unnecessarily drain your water meth tank dribbling round in traffic so its ready for when you get nasty with it!

There are calculators online you can dig up for how much petrol is needed to support a given hp level. You would have a pretty good idea of how much hp you are aiming for, so you need to flow your water meth system into a bucket and ensure you set it up to put out about 1/3 of the volume you calculated earlier that your engine is going to use for fuel at full noise.

If this makes any sense please PM me with an accurate interpretation!

Cheers,
Jason

[MWP]

so you need to flow your water meth system into a bucket and ensure you set it up to put out about 1/3 of the volume...

1/3rd is a crap load.
All the reading ive done on water injection says 1/10th is approx the best amount.

This is a decent quick read on cheap water injection:
http://autospeed.com/cms/title_AutoS...8/article.html

[NME308]

1/3rd is a crap load.
All the reading ive done on water injection says 1/10th is approx the best amount.

This is a decent quick read on cheap water injection:
http://autospeed.com/cms/title_AutoS...8/article.html

Then keep reading my friend!

http://autospeed.com/cms/title_The-H...3/article.html

The amount of water that has a positive effect can be as small as 10 per cent of the fuel flow (a water/fuel ratio of 0.1:1) and as high as 150 per cent of the fuel flow (a water/fuel ratio of 1.5:1).

Cheers,
Jason

[Duk]

A good water injection system should be variable flow to match the fuel usage.
Most systems that are variable flow use a variable voltage controller that slows down the pump to reduce flow. This invariably results in lower pressure at the nozzle and an increase in droplet size and/or dribbling.
I like http://www.fjoracing.com/products/wa...tion/parts.php (I haven't used any of their stuff, tho), especially their high speed solenoid spray nozzle

[NME308]

I like http://www.fjoracing.com/products/wa...tion/parts.php (I haven't used any of their stuff, tho), especially their high speed solenoid spray nozzle

Quoted for truth!

At over $1000US however for someone like me it is a little pricey...
I was just providing an example of how cheap it can be set up, and as per my own practical experience the kit does not have to be scientifically perfect to achieve the results needed.

Cheers,
Jason

[Duk]

I want to get my hands on 1 of those solenoid valve nozzles and use the extra injector map in my E Manage Ultimate to run a post intercooler spray aswel as the small pre SC spray I have.
A cheeper method for other EFI cars could be the Jaycar Digital Boost Controller. It uses an injector signal as it's input. What better way to drive a water injection system that neads to be proportional to fuel flow?

[MWP]

I like http://www.fjoracing.com/products/wa...tion/parts.php (I haven't used any of their stuff, tho), especially their high speed solenoid spray nozzle

Now there is an idea...
Just buy the "high speed solenoid spray nozzle", and use a Jaycar DFA to control it.
Have the DFA read fuel injector pulsewidths then divide that by 3/5/10 or whatever.

I wonder what the difference is between the "high speed solenoid spray nozzle" and something like a methanol fuel injector.
The methanol fuel injector should be stainless right, so it shouldnt rust?

[Duk]

I wonder what the difference is between the "high speed solenoid spray nozzle" and something like a methanol fuel injector.
The methanol fuel injector should be stainless right, so it shouldnt rust?

I thought about that too. Problem being, the only stainless methanol injectors I could find were huge 1600cc fcukers.
Another option might be to add a good spray nozzle directly to a quallity solenoid valve and try and figure out the best frequency for the thing to operate at so that you can get the solenoid to sort of hover in various amounts of open for increased duty cycle. (if that makes sense).
It's what the reccomended for the Jaycar DBC to prevent solenoid valve wear.

[NME308]

You guys are missing the point!

Water methanol does NOT have to be proportional to fuel supply! The research indicates amounts of water meth in concentrations from 10% to 150% being effective. My point is that this is one of the most forgiving things to tune full stop!

If you want to make it complicated for kicks and giggles go ahead!

Using a hobbs switch to engage water meth at 10psi or greater if wished will ensure you are already at wide open throttle and pretty much maximum fuel flow while water meth is being requested anyhow. This makes the need for 'proportional' flow pretty much redundant. Oh and also cures the problem of rusty efi style injectors because you can use anything from mechanical alky injectors (old school stuff) to garden misters to introduce the stuff in the air intake pipe in front of the supercharger!

Cheers,
Jason

[MWP]

You guys are missing the point!
Water methanol does NOT have to be proportional to fuel supply! The research indicates amounts of water meth in concentrations from 10% to 150% being effective. My point is that this is one of the most forgiving things to tune full stop!

Nope im not...
If im going to the trouble of installing water injection, im going to control it properly.
Itll be running *all* the time, not just when on boost.
Ill then be able to lean out my fuel mixtures (14.7:1 or more) right the way through the fuel map.
Itll give me awesome fuel economy and an internally spotless engine, plus of course, det resistance on boost.

Ill run 10:1 off boost, and more on boost.
Water tank will only need to be ~10L, and be filled when i fill with fuel.

[Duk]

Nope im not...
If im going to the trouble of installing water injection, im going to control it properly.
Itll be running *all* the time, not just when on boost.
Ill then be able to lean out my fuel mixtures (14.7:1 or more) right the way through the fuel map.
Itll give me awesome fuel economy and an internally spotless engine, plus of course, det resistance on boost.

Ill run 10:1 off boost, and more on boost.
Water tank will only need to be ~10L, and be filled when i fill with fuel.

http://autospeed.com/cms/A_110615/article.html