Gurney flap & some engine bay cooling

Time to add some extra aero. There's a bunch of things to do to get the most out of the EVO CT9 and one of the small but very effective ways to add some aero is by adding a Gurney Flap to the rear wing.

There's a lot of science out there since Dan Gurney put his name to it back in the 60's but if we strip back some science and go with the basic rule of thumb of between 1-5% of chord then i should be ok. So what this comes down to is measuring the wing across the face and you get 192mm. Then if you multiply that by 2.9% you'll get 5.5mm. So i'll start off by making one out of aluminium at 5.5mm in height and see how it goes on the track. No wind tunnel testing here!

For those who want to read some science then there's some great info in Zerihan and Zhang's thesis http://www.southampton.ac.uk/~mb4/xin_zhang/27.pdf

So after reading you'll know why I've chosen to start at 2.9%. So if there's any benefit i can measure it and then always make them bigger and try to measure those benefits also until 5% is reached as i don't think i will be going fast enough to ever go over 5% due to the drag it creates. 

The EVO needs a much better splitter and this is on the cards also, just trying to source the right materials at the right price and then i'll post it up.

Until then, enjoy some Gurney Flap DIY.

And then the thesis by Davis http://soar.wichita.edu/bitstream/handle/10057/3715/t10084_Davis.pdf?sequence=1

I've a lot to learn about aero, as do most people, but there are some results that are proven and some are not. A lot of the big name brands in Japan & US (ahem Voltex, APR) have these products available and have tested these to a degree and if you want to pay race car tax for these items by all means, but I'd rather study Cyber EVO and make the bits myself as they did in the early days.

Material used is 1.5mm x 24mm x 24mm aluminium

So admittedly that was a quick job so i also added some aluminium insulation tape to all the pipes in the engine bay that i want to remove from heat soak. Yes i hear you saying that by wrapping these pipes i'll be keeping heat in also but the heat created by the turbo & manifold will be hotter than the air inside the pipes so I'm happy to give this a go. There's only small gains here if any, but a small gain is a gain. I believe for every 5 deg cooler you gain 1% in power.