Quote:
Originally Posted by glamcem
Do you have any experience with FRS/BRZ platform? Can you recommend any spoiler/wing upgrade that can go with a lip spoiler that I can combine with it?
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Nope. I haven't purchased one yet, so I can't help you with specific pieces for a twin. The principles, of course, are the same when talking about production-based passenger cars.
If you'd like to understand those principles, I recommend
Competition Car Aerodynamics by Simon McBeath. It is written in plain English, and it has more than enough in it to answer your initial questions, as well as the ones you'll have later. The information in it will enable you to make much more informed choices, which will save you money in the short and long runs. It's pretty easy to buy a bunch of pieces that don't meet your real needs.
Re: Flat Bottom & Diffuser - don't bother with the latter unless you've installed the former. Every professional I've dealt with has made that perfectly clear. Air that is tumbling along underneath the car is not going to attach itself to the face of the diffuser just because it's there. I'd put that pair of aero pieces at the bottom of any list you're making.
Re: "I am on the fence of adding an extension to the front lip like my friend did to his MX-5 since I believe it will improve the air flow for the brake ducting..." - air flow in that region of the front bumper cover isn't well understood. This CFD graphic is a useful illustration:
Re: "We know a local guy who can fabricate a custom abs lip like in the picture below" - know that MDO (medium density overlay - used for outdoor signs (think highway signs)) can be worked into any flat shape you want; it's easy to work with, not expensive, can be painted, and it's great for putting a radiused leading edge on the splitter; this graphic shows why you want that radiused edge if you're after maximal downforce from the splitter - i.e., it results in a 'hot spot' of strong low pressure and the passing air being attached to the underside of the splitter, thereby increasing downforce and reducing drag:
