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DIY Custom Front Splitter/Undertray and Diffuser

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Old Dec 15, 2014 | 01:43 PM
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Default DIY Custom Front Splitter/Undertray and Diffuser

I am currently in the process of mocking up some aero for the SC as I plan to take it out to some track events next year...

I am willing to share the cardboard template if anyone is interested.....its for 92-96 style front bumper with SC400 lip

Also others should share some of their FUNCTIONAL aero.....

Here are some progress pics of cardboard template for the splitter/undertray...I will be making it out of alumilite or dibond....1/4" thick material...it is super light weight and very strong







Stay tuned for updates.....

Last edited by CatManD3W; Dec 15, 2014 at 01:53 PM.
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Old Dec 15, 2014 | 03:21 PM
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oooh. i have been thinking about something like this. subscribing
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Old Dec 16, 2014 | 09:37 AM
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Originally Posted by estomax
oooh. i have been thinking about something like this. subscribing
Me and a buddy will be putting the finishing touches on this at the end of the week........and before anyone comments I will be attaching the splitter to the subframe with aluminum brackets.....I do things right no half assed stuff here

I still need to see how to make it removable with ease....

Last edited by CatManD3W; Dec 16, 2014 at 10:11 AM.
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Old Dec 16, 2014 | 10:38 AM
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That's the way to go .. Awesome share to the forum family..
Did you do any final results?
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Old Dec 16, 2014 | 11:36 AM
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are you going to track this car?
it would be awesome to have some before and after data logs or something
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Old Dec 16, 2014 | 02:08 PM
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Originally Posted by mecheng10
are you going to track this car?
it would be awesome to have some before and after data logs or something
At some point yes.....it has been proven that it provides significant downforce......
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Old Dec 16, 2014 | 04:44 PM
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Originally Posted by CatManD3W
At some point yes.....it has been proven that it provides significant downforce......
Just thinking out loud here, and I've never seen anything about it one way or the other... Wouldn't producing more downforce up front on a RWD car be bad unless also increasing the downforce in the back? Maybe the suspension will be able to compensate, but I would think pushing the nose down would lift the tail a bit, reducing grip at the drive wheels. The car is already somewhat nose heavy and not lacking for being pushed down up front.
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Old Dec 16, 2014 | 11:38 PM
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Default splitter

was considering doing this and having it shaped using plexi glass...
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Old Dec 17, 2014 | 12:59 AM
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i have been thinking about something like this.
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Old Dec 18, 2014 | 06:35 PM
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Originally Posted by skeet92
was considering doing this and having it shaped using plexi glass...
Plexiglass is to weak....you need something stronger....it will crack and shatter into a million pieces....

Look into the material I mentioned above...they can be found at any sign shop
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Old Dec 18, 2014 | 06:36 PM
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Big things popping!

Nice work so far. Can't wait to see the finished product.

I'm 97-SC300 brother by the way.
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Old Dec 18, 2014 | 06:46 PM
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When you design it, think about using some sort of breakaway standoff to attach. When you go off track, it shouldn't take the entire front of your car with it should it catch on something.

My wife started with the alumalite stuff for hers on her m3, but she ended up building it out of fiberglass instead, and putting on a Kevlar edge at the front of it. Her car is full track so also has 2x dive planes and big rear wing for more aero.

Here's a pre-painted pic as she is was building one of hers (think this is v2.0 out of 3, each gets lighter and better) so you can see the little pucks she embedded for the standoffs to attach hers.
Attached Thumbnails DIY Custom Front Splitter/Undertray and Diffuser-image.jpg  

Last edited by DaveGS4; Dec 18, 2014 at 06:52 PM.
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Old Dec 18, 2014 | 06:56 PM
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Going full on track spec........I have just started with the lip....I plan on mocking up some more parts for side diffuser on stock OEM sideskirts, rear diffuser....and rear wing....

Do you guys think the rocket bunny spoiler for say a 240sx makes pretty good downforce...it is similar to nascar and other sports car racing...

I thought about taking about a 6-8 inch strip of alumilite and making it similar to the way nascar rear spoiler does with the adjustable wing struts to the rear trunk

Similar to this:


Last edited by CatManD3W; Dec 18, 2014 at 07:10 PM.
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Old Dec 18, 2014 | 08:15 PM
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I use ABS plastic for the front splitter, it's heavy, but has survived 30 hours of bad driving and mowing the grass/off-roading. Most of my flat panel bottom and diffuser were ripped out the first tack day this week

DIY Custom Front Splitter/Undertray and Diffuser-zn8dqvm.jpg

Last edited by fried_rice; Dec 18, 2014 at 08:24 PM.
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Old Apr 17, 2016 | 04:48 PM
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Did you ever get these parts made?
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