Quote:
Originally Posted by d69chris
the Roto-fab seats to the hood, instead of a lid. The intake tube is screwed to the box. It seals across the bottom and up the fender well. The only place left to draw air it the front of the box, where the stock use to, and more volumn coming through the grill. Not sure what a lid adds that sealing to the hood would not.
I don't have a baseline, but am planning on getting my car dynoed this week, if I can find someone that knows what they are doing in my area.
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We've been involved in a great deal of testing on an engine dyno with enclosed air boxes. Engine dynos are good for this because they take some of the variables out of the equation when testing various designs.
We've learned one general rule-more space around the filter means more power.
We ran box configurations in different sizes, with and without a lid, no lid and a hole cut in the box and finally no box at all. Each time we created more space around the filter, we gained power. If you can install a 2' cube to mount the filter, that's ideal!
With packaging considerations, it's not very realistic though.
The other issue is filter size-generally, bigger is better. However, an increase in filter size or changing the shape for packaging can have negative effects. The filter itself can block air from traveling around to other areas of the filter if it's too close to a wall. This reduces the effective size of the filter regardless of it's physical size.
Our approach is to use as large of a filter as possible while leaving as much room as possible around the filter. Using the hood as the lid maximizes the space available. It is important to seal off engine/radiator heat, so we do effectively address that issue as well.
We have incorporated many features in this intake that are a direct result of extensive testing and engine dyno results. With N/A vehicles, all of the "little things" really do make a difference, especially in actual driving conditions.