SiEP3 wrote:I'll need to personally write to Honda on this, if anything just to clarify wrt to warranty etc. I was just interested to know if anyone else had asked the question.
Honda themselves haven't released any figures on downforce which would be interesting to know. There is a difference between downforce and drag, the marketing stuff does state that it is a negative lift car, however the flat underbody and diffuser alone if done correctly could provide negative lift, I just wonder how much additional negative lift the wing provides as speed increases , or whether it helps more with reducing drag (and minimal lift) at high speed at say 160mph, I would think at that sort of speed the benefits of low drag far outweigh even more downforce, its also a fixed wing (not active aero like a real wing where you can effectively change lift characteristics to vary with speed ) so the difference in downforce achieved at 70mph the max speed is considerably less than at full speed.
Warranty. You will not void the warranty for parts which you have not touched. For example, if you get a seized rear calliper they cannot, and will not, say that your alteration to the tailgate caused that because it clearly didn't. However, if you get a water leak in the boot they may say that your modification was a contributory factor or, at worst case, the cause.
You won't get any figures for down force. I tired. The most you will get is a statement "that the overall effect is negative lift" and as you say this is from the marketing bumpf. During the press briefings only analogies were used without the figures and graphs without quantities on the axes. However, the wing is designed to flex - it will slightly change profile as load increases reducing drag
I was lead to believe that the wing profile is designed to produce negative lift to keep the rear in check in combination with the other features on the car. The most interesting item, I think, for drag reduction on the car is the side fender vents.