This How-To is for replacing those annoying plastic fasteners that hold the undertray on. I looked into using Dzus fasteners but they are very expensive. If you have the cash by all means they would be great but the Southco captive fast lead screw is cheaper and can be removed almost as fast as a Dzus fastener using a cordless drill.


Annoying plastic fasteners.


Plastic undertray


Captive Fast Lead Fastener Southco part#17-11-204-11


Lead Screw clip Southco part#17-10017-11


Rivet Receptacle Southco part#17-10015-14

Install pictures next...

 

The clip conveniently attaches to the plastic tabs on the front bumper.


For the frame and sub frame you'll have to drill the hole bigger...


To about 11/16"


New hole to allow the rivet mount receptacle to fit flush.


Drill 1/8" hole stainless steel pop rivets.

 

Paint the exposed metal for rust protection.


Pop rivet in the receptacle


Installed on front frame.


Installed one on the front cross member. One is enough here.


Attached captive lead screws to the undertray and install.

 

Very cool. Props!

 

Gonna try it!! Thanks

 

Here is an old post of mine that I have had good success with, and still use the same pieces today.

https://www.evolutionm.net/forums/3134211-post78.html

 

Good idea and nice write up! I am always looking for better solutions to mount my undertray quickly because the D-ZUS fasteners dont always work.

 

OR (and this is a big "or") you could just use the other factory clips and be able to take off the tray in 5 min with one flat screwdriver.

Just saying.

https://www.evolutionm.net/forums/ev...ion-clips.html

 

+1 ^

Small investment for a 5 min removal. Best "go fast" mod I ever spent my money on!!

 

njboy, how much did this cost you overall?

 

Depends on the vendor but the total mod is around $30-$40 depending on what tools you need. You may have to try different sellers to get small quantities less than 100 etc.
I looked into using other plastic fasteners but I didn't want my tray coming off if I take the car up past 100mph. Using the fast lead screw is definitely less expensive than the Dzus fastener.

On another side note these stainless fasteners will add a little less than 1lb extra weight to the undertray area.

 

I'm sorry, but what in the holy hell are you talking about????? Seriously?

So the screw-in clips were wind tunnel tested to resist the drag of 100mph, yet the push clip, through the miracle of interwebs and conjecture, are rated at...... Something below 100mph?

I'm trying to wrap my head around this logical step you have taken.


Here is some actual input: I've been using the Mitsubishi push clips for over a year with many (frequent) trips north of 100 mph. And you would be shocked and awed to know that the tray holds on just fine.

As you took the many, many, many hours of researching the bolts you went with, plus drilling, riveting and assembly I made the logical leap of faith that you would understand the tray wont mysteriously fly off at the speeds this car is capable of. You have proved me wrong sir.

 

I'm glad the tray holds for you. I wanted a fastener that was not plastic. It may sound like I attacked you personally but that's not the case.
I chose 100mph arbitrarily only because it's a round number. :-)I don't want my tray falling off at any speed and this is my way of probably over-engineering the problem.
Standard disclaimers apply do what you want I'm just showing another method.

 

the spoiler falls off at 150mph as well.

 

I used lots of those plastic lisence plate press-in screw hole thingers and medium sized screws. I'm so inlove with my mini cordless screwdriver right now (i havent had much use for it for 5 years)