Short version:
I have an APR 300 wing. Looks like it's producing enough DF at MIN AOA to left the sheet metal of the trunk. I can see some deformation right in front of the mount. I am not moving a a larger Kognition wing and so am obviously worried about it being worse seeing how it uses the OEM mount points. To make things more complicated, I have a dry carbon trunk I'd really like to use.
So...

Has anyone make up a mounting system that bolts to the trunk floor, then the trunk sits on it, then the wing on top of all to "sandwich" the trunk? I'm thinking I could then use a "hood pin" time of quick release to mount the front edge of the trunk (If I can find a way to securely mount to the car) and the rubber pull-type tension straps on the back. That will give me a way to remove the trunk.
Or will it be fine?
Or am I trying to reinvent the wheel and there's a proven way to do it?

 

Maybe just doing w/Tim did w/one of his rear wing versions. Wide base foot print (see pic) and removing the rubber trunk feet & going to a solid foot. Pretty sure he moved on to a real serious Cognition wing where the verticals descend down through the trunk sill & onto to the trunk floor

 

That may work on my metal trunk, for now. The new wing has a really nice-sized base.
I'll still have to figure out something for the CF trunk.

 

I like your sketch and design.

Have you considered moving the wing mount to the fenders. With the size and height of the wing you are considering it may clear the trunk lid.

Add bracing under left and right fender and bolt wing to that. Angle supports inward if needed.

Mitsuatb

 

I'd prefer that, I'm just not sure how hard it is to do custom uprights.
Right now I'm considering making a box (or maybe just a "U") out of 1" square aluminum and mounting it to the truck floor. I can put the hood pins on the front and the trunk lid/wing supports on the sides, then shim as needed. It shouldn't weigh much.

 

I've debated for a long time cause I'm using a Kog wing and oem trunk mount too. Given the chance to have a fab guy extend the cage into the trunk area and build the mounts, I'd do it sure. I just haven't seen the need yet to spend that level of money on it. What I also found interesting is that it...technically...is acting like Active Aero. The faster you go in a straight line, the lower the wing angle naturally gets but we're talking cm's here not inches. But as soon I we slam on the brake all of that jumps forward and you're back to your set AoA. It's a bit ghetto to think of it that way but it really works. As it pulls up on the trunk air is now getting into the trunk area off of the windshield, as is sand and dust. So I think i'd also put vents in the trunk. The only reason I haven't yet is because a certain honda racer out of AZ had an oil fire come IN said vent ports at an accelerated pace Vs had he not had any exposures back there.

 

When I say the wing is lifting the area in front of the mount, I mean right in the middle of the trunk.
I can actually see and feel where the metal is bent.
It's like this on both sides.
I can't imagine this Wing would put that much stress on the trunk, but I can't figure anything else it would be from.

 

Maybe you dont have enough leading edge wing angle? (lift?) One would think we should see a trunk depression if there was significant downforce? Are you measuring your wing angle w/a finder?

 

Paging @Kidloco51

 

​​​​​I used a level to guesstimate the least AOA I could, seeing how I have no front aero.
unscientific, but the car is SUPER neutral right now. I got really lucky. Car handles great.
So, now that I have it right where I like it, I'm going with a new wing and adding a splitter so I get to start all over LOL

 

Ben has called Tim for some real help

Remember, many years ago i failed the stock wing at Fontana (F'r snapped so hard it dented by trunk). No doubt, there's some real shaat going on back there LOL

 

it would definitely seem so. Newer wing has a decent footprint. But I don't trust it...

 

Oh hey, I saw that wing for sale lol

 

I'm stilling rocking an evo 8 wing, but my car's overdo for quite a few things. Mainly better shocks and some aero.

 

I have an APR GTC 300 with risers for sale It will save you a ton of money, since it's not pretty (chipping clear coat) but functional.