Time for another update.
This next project has been a few months in the making, but I finally got round to completing it about 2 weeks ago, and have been doing testing since then.
Following on from measuring intake temperatures, I wanted to build an enclosure for the filter for the following reasons: 1) insulate from some of the heat, 2) tone down the induction noise.
I started off with some cardboard templates, and after much cutting, measuring, fitting, cutting, and so on, I ended up with the following:
I also made a lid for it too:
After some more trimming, these were the final bare pieces:
For heat insulation, I used heat-resistant paint on the one side, and then insulating foam on the other side. I did a couple of scientific tests using open flames etc, and I can confirm that the insulation properties are pretty good, lol.
And here is the final product, all fitted:
Onto the results. The noise is definitely toned down quite a bit, but you can still hear that there is something cooking under the hood. But overall I am happy with the result.
In terms of heat insulation, I have tested for a while now, and I can honestly say there is no noticeable improvement in the temperature of the air which surrounds the cone filter. The figures are pretty much the same as without the heatshield in place.
So, the above results can be for various reasons. 1) My airbox effort is not a 100% tight seal everywhere, there are some small gaps, where hot air could still enter. This also applies to the noise. 2) It could also be residual heat filtering through the chassis leg, and fender. 3) I didn't have millions to R&D a proper plastic airbox that seals 100%.
So in conclusion, the noise has been toned down a bit, but there is no real improvement in air intake temps. Plus the turbo heats up the air anyway, so effective intake temps will always be 3-7deg above ambient (based on my previous testing).
That's all for now.