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DIY: carbon front fender spats

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Parts required:

Mcmaster sheet CF 1/16 thick: https://www.mcmaster.com/8181K27
Mcmaster sheet CF 1/32 thick: https://www.mcmaster.com/8181K44
Mcmaster square CF square tube: https://www.mcmaster.com/2040N11
Rivnuts variety of sizes, M3, M4, M5, M6, M8 e.g. https://www.mcmaster.com/94020A391
Mcmaster Black bolts and washers, M3... M8 e.g. https://www.mcmaster.com/91239A418
Mcmaster low profile black fasteners: https://www.mcmaster.com/99024A305

Tools required:

Drill and assorted bits
Rivnut tool


1. Make cardboard templates. Measure wheel to the cardboard with car on the ground to get the rough shape and then take down a half inch or so as it's not needed.

2. Cut the spat and underside panel from template. Cut the endplate but leave some additional material for final trimming

3. Line up the spat and drill alignment holes through it, and the front splitter, and bumper lip as you go.

4. Start with a couple of attachment points at the bottom and then move to the top so it's all held in place. (tape the top so it doesn't scratch the paint while working)

5. Drill the right rivnut size and install it.

6. Drill the right size for the bolt through the spat and then bolt it up.

7. Repeat up from bottom to top

8. Move on to the flat underside, use three M8 rivnuts at the front, middle and rear of the underside. Caution, be careful not to let the drill pull through and punch a hole in the upper side of the spoiler as it.. sucks arse.

9. Cut 90 deg angles from your carbon square tube.

10. Drill holes in the 90 angles

11. Mark where you want the endplate to attach and drill through with a 1/32th bit so you have room to do if you mess it up.

12. Drill out the size required for the low profile nuts+bolts and then install. Put the flat washer on the inside as it grabs well on the carbon tube surface.




Edited by thehelix112, 18 October 2020 - 12:03 PM.

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nice work! my neck hurts from turning my head :)


what is the intended goal behind fender splats besides looking aggressive? more front end downforce? bug catching? how do these compare to something like front bumper canards?

Edited by choerizo, 28 September 2020 - 03:09 PM.

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Sorry about the pictures man.  I can't actually fix them on my phone but I'll try to do it on my computer later today.


The primary goal is to improve the efficiency of the overall setup.  I hope this will do this in a few different ways:


- Create a low pressure zone ahead of the wheel and suck more air through the coolers (oil and DCT) on either side

- Reduce drag by avoiding having the wheels in the primary airflow

- Minor downforce improvements provided by the flat pieces and the endplates (tunable by changing the size of the endplates)

- Reinforcing the bumper/splitter by attaching them to each other


Hope that helps,





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Oh I forgot to say, similar goal as canards/dive planes. They both setup vortices down the side of the car as well as providing some front down force. Canards won't help pull air out of the wheel well though..

I plan on doing rexspeed kansai canards to match after I've seen how the balance with this setup is, and/or have gotten rear wing risers to get a bit more df back there: https://www.vividrac...-151454616.html


Edited by thehelix112, 18 October 2020 - 12:05 PM.

  • 7racer likes this



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Very nice, I'm definitely going to have to keep this in mind

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