Anybody running an APC GRC 300 or bigger on a stock un-reinforced trunk?
I'm being told with the Evo, the deck lid needs reinforcement for the added downforce. I remember racing a 911 GT2 with a big-*** dual-level wing sitting on an un-reinforced lid, and it never flew off. The 911 lid is also a lot smaller, so maybe it can hold the weight better, I dunno. What's the verdict? Reinforce it, or no?
FWIW, the car will be going through some pretty high-speed turns(T2,8,9 at Willow), so a lot of force will be placed on the wing/trunk.
Hurry! It's holding up the install, and I wanna get this thing done and to the track
TIA

 

The Evo Spec GTC-300 uses an extra drilled hole to help support the mounts. Most I've seen don't add any additional supports. The wing comes in 61" and 67" widths. LMK if you need one.

 

I have one, and am having it installed. I'm told it'll cost roughly $800 to reinforce the trunk for the extra downforce, and I'm trying to find out if it's neccesary.

 

Seems as if you could simply brace the top of the trunk to the back of the trunk and it would support about as much weight as the wing could generate.

For $800 I would hope to see some holes in the trunk that extend the wing to the LCAs where it would put all the weight on the tires and not on the suspension. This way you don't eat up suspension travel with downforce.

Ok, maybe not for $800 but thats a good bit of cash to simply shore up a trunk imo.

 

Seems like the area needing the reinforcing is where the trunk lid would close to the body of the car. The trunk, when closed, is only really being held closed by the latch, but being held in place my two small rubber bumpers on the frame of the car, and two on teh trunk lid itself (The two bullet shaped piece.) I would imagine that when running a big wing such as that, you would see the rubber bumpers getting *squished* and not transferring the downforce to the car effectively. I have never done it before, but I would somehow make the force transfer from the trunk lid itself to the body of the car better than having it go through the rubber bumpers.

 

I would talk to Johnny @ APR, Phone: (909) 594-3796. Also try Muller as they have one on their track Evo, they use a diagonal brace to keep the wing from moving side to side.

If the wing mounted to the center of the trunk it would need bracing. The Evo spec CF bases bolt right to the stock trunk holes, with an additional hole needed for support. I turned my trunk bumpers out for my GT-II wing.

Rick

 

I e-mailed Bushur and AMS. They both said the stock trunk should handle the extra weight.
I have a fabricator down the parking lot from my shop, so I'll prolly just look at the supports, and figure something out if it looks week. I think if it was however, someone would have chimed in with a horror story about it flying off with pieces of the trunk still attached.
Mueller has the car, and says the GTC 300 wing (one I'm using) uses different mounting points than the stock one, so that lid's trashed. Just have to look for another
Thanks for the input guys.

 

AMS, DTM, Works and a few other shops should be able to give good help with road racing stuff as they have great track records with road racing. Buschurs build good power but how many great road race cars have they built?

In other words talk to folks who do the sort of thing you need at a high level and talk to them. If your building a drag car Buschurs would be a good place to go, maybe not so much for this?

 

Working too hard? I posted I e-mailed Bushur and AMS.
They wrote back that with the mounting of the wing I have, it puts pressure on the outside part of the deck lid, where it's strongest. Said I should be ok with no bracing.

 

Define too hard. 6, 12 hour shifts in 6 days.

 

Yeah ... That qualifies. I've been working 6-days 8-10-12, hours a day for three years now, and I'm kinda spent.. Sunday, I just wanna stare at the wall. Racing kinda shoots that one for me though.
You gotta try to tone it down, or you're gonna burn out.
Hopefully it's just temporary.
Good luck