Of course I'm not, Andy. I'm an amateur mechanic and a club racer, not a aeronautical engineer. Anyway, I said it was a 66% reduction in the cross-section area, not a 66% reduction in flow. (You quoted it in your response, so I know you saw it.)
I don't know. Feel free to ask them.
Conversely, where would I find information describing why 27mm is correct? I haven't seen any real help in understanding the issues; just assertions that it's correct, unbiased, and so forth.
Meanwhile, you've missed gone on about these other points and missed my most important question: I'm interested in hearing what other BMW racers are doing to prep their cars. As far as I can tell, just mounting the part requires custom fabbing duct work (to match the diameters of the SIR to the MAF), or finding a supplier who can make an SIR with the correct diameter. If I can find other drivers who are solving this same problem, it would help greatly; it's my hobby, and not my business, so having such a substantial workload dumped on me at the last moment is prohibitive.
In fact, at this point, I just can't imagine competing in ITS this year; I just don't see how I can get the fab work done, end up with something that works, aand so on, in time to have a successful season. Switching to a different class looks far easier.
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