With the whole car, you'd never know without a wind tunnel or an enormous amount of measuring, point-by-point, under the car. However, in the engine bay you could just do what I was describing before with a long hose, one end in the car, one end where you want to measure, and do comparisons that way.
I've put a flat bit of metal from under the bullbar bumper to a steering guard, (the factory type, which is a big bit of pipe: NRC7009 - just so you can picture it), and sealed up the bonnet. I know I'm getting low pressure because of it, but haven't had the chance to measure it yet.
Interestingly, that factory fitted a plastic thing under the front of the engine bay on some '90s models, MWC6937, which is referred to as a "cooling tray", (or something like that), in some factory books. I think it was used in conjunction with that plastic front spoiler under the bumper, but I still haven't worked out what it was supposed to do. I'm going to make something similar and see what happens - I've got to do the measurements as above first, though.
At any given point in time, somewhere in the world someone is working on a Land-Rover.
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Originally Posted by Davo
Thanks for the link. That's the kind of thing people need to read to get a start on this. There is so much really good information out there these days that this biggest problem is wading through it all.
Autospeed is excellent and is where I really started to actually learn about this stuff, instead of just guessing. Then I found reports and technical sites and have kept trying to learn.
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