Undertray Question
Thread Starter
Racer
Joined: May 2000
Posts: 453
Likes: 51
From: Stuart Florida
Undertray Question
I have a stage 2 splitter on order. Is it necessary to add the undertray? If so is it in addition to the panel above the stock splitter that is basically under the radiator?
Thanks,
Gary
Thanks,
Gary
Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,821
From: Charlotte, NC (formerly Endicott, NY)
I have only been under my Stage 3 car which comes with the Stage 2 splitter installed from the factory (Stage 2 end caps are installed at the dealership or by the Customer). My under tray covers a large part of the bottom of the front of the car. It is below the splitter and fastened to it with 22 or 24 small screws. It also seems to reinforce the splitter, especially in those situations where the splitter is dragging on the ground entering a driveway. The dragging tends to push the edge of the splitter down and backward and the undertray fastened to the edge resists that motion.
Bill
Bill
Pro
Joined: Jul 2016
Posts: 698
Likes: 191
From: N. San Diego-Fallbrook California
As Bill stated the undertray is used to reinforce the splitter. I recently put a Stage 2 splitter on my car without the undertray. I have not had any issues as it is a ridged splitter however you will have to be careful with driveways, curbs, etc. I replaced the Stage 1 splitter that does not have an undertray and the Stage 2 fits in the same holes, no real impact to the radiator in my opinion. That said, I would install the undertray to support the spltter. It is more of a gamble the car scraping without it, as in my case. I may purchase one in the future.
Last edited by SLEEKVET; Mar 15, 2018 at 12:54 PM.
Cruising
Joined: Jul 2016
Posts: 14
Likes: 7
From: Eastbay CA
When I installed mine I had to remove a large piece that some call the stage 1 undertray, it has a rubber flap hanging down. I installed the GM stage 2-3 undertray ($100+ approx) which does indeed bolt to the front splitter. The instructions are not very clear, pictures only. Cosmetically, it seems like you could get away with not installing the undertray, but it seems like you would be missing a big chunk of what makes it "aero" as it makes the whole bottom part flat. Also, acs told me they have a beefier one that they believe to be superior to the OEM one. The GM one is not very ridged, tho I don't know what benefits come with a stiffer tray. There are a number of threads about this but it did take some digging to piece together the info. HTH
PS if you do remove the old one, I strongly recommend removing the metal clips that hold the screws on as GM privded new ones which might hold the screws better.
PS if you do remove the old one, I strongly recommend removing the metal clips that hold the screws on as GM privded new ones which might hold the screws better.
Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,821
From: Charlotte, NC (formerly Endicott, NY)
I was under the car today and took a look at the undertray. The undertray bolts to the splitter and to the cross bar below the radiator. There is a large flap that bolts to the cross bar and and to the cradle. The splitter is above that large flap which only covers the center portion.
Bill
Bill
Thread Starter
Racer
Joined: May 2000
Posts: 453
Likes: 51
From: Stuart Florida
I was under the car today and took a look at the undertray. The undertray bolts to the splitter and to the cross bar below the radiator. There is a large flap that bolts to the cross bar and and to the cradle. The splitter is above that large flap which only covers the center portion.
Bill
Bill
Gary
