RapidC84B

I just can't get on board with the hatch mounted wing? My C5 racecar had it bolted to the frame. There are options to do this with the C7, but the APR price is attractive for a trackday/TT car. I'm concerned about hatch movement under load and stress fractures over time.

Input?

charger21

I would not. It just goes against everything I have learned about aero. It may work if you are not expecting a high rate of downforce. I just have a spoiler on the rear of my C5, and it is even bolted to the frame.

davidfarmer

hundreds of people do this every weekend, the cars have thick multi-layer composite decks and are strong enough to withstand anything expect for a hard impact. It will come off in an impact, but otherwise you will be fine.

I personally have mine bolted through the decklid into the rear tub.

We are talking about DE, not wheel-to-wheel. The decklid is much stronger than the thin-walled APR wing

charger21

^^^That is kind of my point. It may work sometimes, but why not do it once the right way and never worry about if it is strong enough.

cooper1219

davidfarmer

n8goodrow

Subscribing as the APR wing is going on soon

c5racr1

sperkins

I worked on a C5 coupe once that had a deck lid mounted APR and the amount of flex was shocking. I measured the AOA change with 100lbs sitting on the
decklid at 3*. This was due to the flex in the OEM weatherstripping. I ended up installing bolts in the tub on each rear corner to act as a hard stop to keep the hatch from compressing under load. I also made large aluminum plates for the underside of the decklid for the wing mounting bolts to go through to sandwich the decklid and spread the load. Once those things were done, the wing was very solid.

Shikaitsu

I've seen 170+ mph with my APR in both roll racing and HPDE. Doesn't move a bit and the car is light years more solid at that speed than before.

Dane@LGmotorsports

I like that front left decal

had3nuf

I haven't seem any issues yet.

RapidC84B

cooper1219

TrackAire

A decently installed wing on the deck is not going to come off (especially something as mild as an APR). I still reference back to the both the ACR and ACR-E. The wing on the ACR-E is nearly 6" wider than the Gen 4 ACR wing and is bolted to what feels to be the flimsiest carbon fiber hatch I have every flexed up and down side to side. It does have some extra bracing for the ACR-E wing, but it's just a thin walled hatch. The issue isn't going to be the downforce (aero suction) as much as the drag trying to rip the unit of the back of the deck. Some will also argue that the angle of attack of the wing will change as the aero suction pushed the deck down and squishes the rubber gasket, etc. I think there is more angle of attack change every time you accelerate and brake as the nose of the car goes up and down due to on track chassis dynamics than the deck getting push down slightly.

Here is a scary video of a twin turbo Dodge Viper ACR-E hitting 215 mph with the wing in place (multiple times). It sucks the car down so much that the car was riding on the diffusers, grinding the strakes away. The driver is lucky that the car did not get air born as the nose of the car came way up. They have since remedied this issue with the suspension IIRC. The drag energy at 215 mph is pretty huge but the wing stay attached.....luckily. A good shot of the car scraping its rear can be seen at around 7:20 in the video. There are also some still pictures of that situation floating around that are even more dramatic.

Lawdogg

Have the APR wing attached to my decklid. 100+ track days, 60,000 street miles, over 150 mph hundreds of times, over 180 mph once. No stress cracks and no issues, just good down force.

Cyclone09Z06

Mine is working great, no issues 18,000 mile. Lots of 150 plus

w00tw00t

@Lawdogg what front splitter do you have to balance the rear wing? also what rear wing do you have? I'm contemplating getting one for my C7 GS (Track car)

Lawdogg

Lg splitter with shorter undertray and world challenge vented hood.