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Motorsports & Track Forum
From Auto-X to Trackday to Racing and Professional Motorsports this is the place to discuss making BMWs fast

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Old 05-26-2017, 08:15 AM   #1
Weste46
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Join Date: Dec 2011
Location: Westfield, IN
Posts: 877
My Ride: 2001 330ci
Flat floor mounting

Hello all.
I was wondering what people on the forum do to mount underbody panels for a flat floor. I have seen well nuts used, but I don't want to have to drill into the floor as this is still a dual duty car, and those holes would probably begin to rust eventually. How do you guys mount your flat floors? I already have a plan for mounting splitter and diffuser.
I will only be tracking twice a year, so this is mostly a fun project, but I still want to do it right and a splitter/diffuser combo needs a smooth bottom IMO. I also plan to fence off the airflow underneath.

Thanks
Weste46

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Old 06-12-2017, 04:48 PM   #2
Fair
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Join Date: Jul 2007
Location: Dallas, TX
Posts: 102
My Ride: Various BMWs
There are no "hard and fast rules" rules when it comes to mounting flat undertray panels. Adding a flat floor can take a significant amount of fabrication work - not just to cut the panels, but to make the mounting anchors, getting the panels level, additional cooling methods, etc. For only 2 track days a year it might not be worth it... ?



Here are a few pictures of aluminum panels we built for a customer's track car (tube framed car). It was a lot of hours...



There are things you have to keep in mind: the radiators/engine bay mostly vent out of the bottom of the car. Any heat sources above the floor will get hot! And if you have an "off" the under panels are the first things that get destroyed.



You also need to make the panels removable for easy maintenance access. Things like an oil change can take 3 times as long if you have to pull panels off to access the filter, drain plug, etc.



But making a flat floor into a diffuser makes that last part much more effective. Hey, if you have the funds and the skills, go for it. But don't expect major lap time returns for the amount of time/effort spent. This is one of those "small" gains you go look for when the rest of the aero package is already maxed out.

Good luck,
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