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OK, been thinking about this issue of the air temp readings and doing some research. I believe the probe used in the airstream is incorrectly configured for air, its a probe configured for liquid - very different type of measurement head and technology required. I am going to swap out the air sensors into the water sensor pick-up points as still waiting for the gauges to arrive - I am sure this will give me the right temperature readings. I have ordered two HVAC style temperature probes and a matched digital display from the UK that is configured specifically for air. I also will move the incoming air probe position closer towards the air filter box. It is currently 250mm away from the inlet to the s/c. Reading the guff from Kenne Bell in the US, the IAT should be measured close to the air filter for the most accurate comparison.
Picked up some further info tonight that I have been chasing without luck previously. The temp rise across a twin screw blower is approx. 10 degF per PSI boost. The terminal temperature of the air leaving the blower is further boosted by the ambient temp (plus any heat soak effect from under bonnet temps), so if I convert to DegC, at 14psi boost, today, I would have had an ambient temp of 12degC plus a 60DegC temp rise thru the blower, hence the air temp leaving the blower would have been circa 72DegC. This temp hits the w2a intercooler core. The info I am missing is the actual chilled water temp, pre and aft the w2a unit, which I will get by swapping out the probes as mentioned tomorrow. From there I should be able to calculate the expected temp drop across the coil, however the new UK temp probes will be the final determinant as they are calibrated and guaranteed accurate within 0.5degC.
The journey continues. All good stuff I reckon. I think it is time to crank the water injection system up as well and see what the total cooling effect is - not going the full water/methanol route at this time, just water.
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