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Originally Posted by Richard L
AKWRX...
I suspect you use alcohol instead of water form two reasons? cooling and fuel supplement?
The position of the temperature may not be as ideal due to the closeness of the un-evaporated liqiud, it may read closer to the ambient temperature of the liquid rather the combined temperature of the part-evaporated liquid and air coming out of the supercharger.
When you conduct further tests later with the probe nearer to the intake manifold, it will also have interest results compared to the previous position. I wonder if you could post a picture of the engine bay so we can see the where everything is located.
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Correct, the use of alcohol injection (actually about 85% methanol/15% water) instead of an IC, is only a part of the purpose. 92 octane pump gas will be used, so the alcohol, depending on how much is injected, should also raise the knock threshold to the equivalent of at least 100-104 octane. That is based on past experience with alcohol injection on a WRX. And, it will allow a much more agressive tune, with more boost, ignition advance, and leaner A/F. With a very agressive tune (up to 23psi boost, and 30+ degrees advance), the WRX has consistantly shown 60-90F cooler EGT at WOT. All these additional pluses should be reasonable expectations with the Honda JRSC, too.
The JRSC has a single port for WI in the intake manifold (very near the temp probe position). This install has that supplied port closed off, and two injection nozzles (HAGO #3s) positioned to be equi-distant between the #1-2 and #3-4 intake runners. There are lots of pictures, but not sorted out yet. Have had some siphoning issues because the tank is mounted above the nozzles. Waiting for a solenoid controlled shutoff valve (similar to a NOS purge valve) to arrive to be installed on the output line and wired to open only when the injection pump is on. There are other optional locations for a temp probe that can be explored if the present location doesn't seem to give representative temp info. All the Hondata programming features are not activated as yet, either. We'll see how things progress in the next few days...