[mops]

Hello.
I'm about to order, Just need some clarification.

Background info on the car/engine/local info.
bmw m20 - straight 6/12 valve 2.7L displacment (84x81 bore x stroke).
With Holset HX35 turbocharger. Front mount intercooler is present but but very big (550mm x 200mm IIRC). It's OK, but could be larger. Megasquirt 2 standalone ECU. This engine is pushing out ~400bhp daily with ~16 psi of boost. This particular engine is prone to detonation around 4500rpm (peak torque). ECU will turn on WI over certain revs/boost

Here in NZ fuel quality is a bit of hit and miss, all though on pump it says 98RON, but fine print says up to 97.5 RON. In reality 'bad batch' of fuel is pretty common and then i have to retard timing. I'm looking for some extra detonation suppression, and I'm wanting to give a water/alcohol injection a try.

Also I'm looking to use 35% methoanol/water mixture, as this is available locally very cheaply off the shelf (ACE -20* windshield spray fluid). If 50/50 mix is much better in terms detonation suppression then i'll use this, but that will require buying methanol separately and mixing it...

Now, the questions:
- After some research I think DO3 nozzle (189cc/min) is right for my application ? DO3 nozzle is 189cc/min but at what base pressure ? (no information on this on the nozzles screen)
- does the fact that i want to run 35/65 mix affect nozzle sizing ?
- I understand 250psi pump is adjustable form 150 to 250 psi. This implies that nozzle output is somewhat adjustable also. Is there any info/data as to how adjustable flowrate is based on pressure ?
- nozzle screen claims 'fine droplets', etc, etc, but at no point actually states the median droplet size at pressure/etc. Is there any data/independent measurments available regarding this ? I came across claims of '14 microns' on those forums, which is pretty damn fine, considering similar industrial nozzles manage ~100-300 micron size (this varies alot with pressure and flowrate, etc, too big topic to discuss here). Only industrial air atomizing nozzles can get to such low territory as 10 microns (these use compressed air to atomize liquid).

[dvldoc]

http://www.alcohol-injection.com/for...sure-1229.html

That should give you a better ideal of how the pumps and nozzles work with each other.

With the new pump you will get higher overall output pressures.

I don't know what nozzles you have availible there but the monarch basic M seriers nozzles put out 25 to 20 microns at 200psi. We had them design us a better nozzle for around 15 to 10 microns depending on pressure and nozzle size. The smaller the nozzle the higher the output pressure the smaller the microns. Methanol is also much less viscous with water that's why you can get the much smaller microns. Even Monarch MTD-92 oil burner nozzles put out 40 to 60 microns at 100psi.

D03 puts out around 4.4gph at 200psi just for FYI. And would work well for your application with the 250psi pump.