Suggestions
Sorry for the delay getting back to the board, just started a new job but on 12 hour midnight shifts so --------- Argggg --- its friday.
Lets see:
- where to install the pre-compressor nozzle?
My nozzle is positioned about 20 inches so if you can I'd suggest about 0.5 meters for your setup.
- how much water to map to the pre-compressor nozzle (and when to switch water on)?
Start with about 2% of max air flow mass, that will give you near the ideal 3% or so at peak torque rpms. I'd turn it on about 50% - 70% of max boost. If you turn it on too early it can send the compressor into surge, If it operates close to the surge line at mid range rpms just as it comes on boost. Low air flow, but fairly high boost, places the knee of the air flow plot at its closest approach to the surge line on many turbos. I'm getting into surge on my new turbo and may need to install an rpm window switch so the pre-compressor WI can't come on until I get over a certain rpm.
Summit racing has a cheap rpm switch that I'm looking at.
- what combinations of injection should I try (post IC water off, pre-compressor on etc)?
For documentation I'd like to see the Pre-turbo only values, then numbers for both pre-turbo and post IC. I suspect you will want to delay turn on of the post IC injection until you reach the boost level that begins to stress the Intercooler and increase manifold air temps.
- anything else?
Yes, a couple passes with the pre-compressor injection on with pure water, and the common 50/50 mix would be nice if you can. That would give 3 reference points so we could guess-ti-mate what other injection mixes would give.
I'd throw out a pre-test guess of around 25 - 30 deg F drop on water alone and around 40-50 deg F drop on 50/50 mix.
Looking forward to your numbers.
Oh almost forgot, please record ambient temp and humidity conditions if you can.
Larry
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