Functional Front Splitter Full Race purpose < Legit!

[BlackMount]

Hey guys, I'm getting ready to custom make a Front Splitter\ Lip or Spoiler or Diffuser or whichever you would like to call it, and decided to post about it to generate some interest and what not. This will me going on my 1994 Talon.

This is from a Member on here and DSMtalk known as cioc, I attempted to contact him regarding his front splitter, and am waiting on a reply about it.

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I will be using the same Material as mentioned above (ABS Plastic) and it will be 1\4 inch thick, and I need to take a few more measurements but as of now I will ordering 2 72X24X0.25 Inch Sheets so I have plenty of material to work with.. Best vendor I found for the sheets as of now is from Interstates Plastics at about 80$ a sheet not including shipping. I will personally probably be using Adjustable Support Rods from APR Performance, which are about 50$ a pair not including shipping; and I will be bolting it all together with Stainless Steel Metric Bolts, Washers, and nuts, and maybe some pins for easy Removal.

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Details about the Material

I will be using General-Use ABS Plastic Sheets 1\4 inch thick. They have Tensile Strength of about 5,300 PSI, and impact strength of little more then 6 Ft-lbs. and is good for hot uses up to 150 degree's with out loosing its shape while being subjected to an outside force.

For anyone who may ask I'm not sure on an exact amount that the splitter will stick out from the bottom of the front bumper but if I had to guess I will probably say 3-4inches

I plan to track my 94 Talon N\T (W\ Turbo), and some added down force would be great, plus I love the look of a nice splitter which was the inspiration for the idea.

*** admin edit - commercial posting policy violation ***

anyone looking for Carbon Fiber front splitter, and willing to spend a little more then 250$ APR Performance - Custom Front Wind Splitter ARP Performance makes them for you. for "340$ and up"

Questions\Suggestions welcome.

 

[nek]

That 1g is BALLER

 

[cioc]

I received a ton of requests for additional information when I first made this a few years back. The splitter works great at providing additional cooling since it seals off the bottom of the radiator. As for the downforce, I have no data to substantiate but it is not as rigid as some splitters. I've heard people make them out of sheets of Alumalite which may be a better choice. Anyway for those making these out of ABS I used a jigsaw to cut the traced shape out and then smoothed all the edges with my Dremel.

 

[blizz99]

I'm very interested in this! When will this be available?

 

[9O_tsi]

that looks awesome
i want one for my car...

 

[GreenGSX]

I built a splitter for the One Lap VR4 last year. I used Alumalite instead of the ABS and I constructed a frame out of aluminum that helps hold it to the bottom of the car. You can check it out here.

How to build a front splitter » Rochester DSM OneLap

 

[cioc]

Now THAT is a functional splitter. Tim, ever weigh the whole assembly? I'm thinking of redoing mine with Alumalite. I may not drop it below the fascia like you did but if it will be functionally better, I may go for it although I'd hate to add too much weight to the nose of the car.

 

[phantom_19]

Ooh man, just like in forza 3 . Really intimidating look on your dsm. Great job

 

[GreenGSX]

Now THAT is a functional splitter. Tim, ever weigh the whole assembly? I'm thinking of redoing mine with Alumalite. I may not drop it below the fascia like you did but if it will be functionally better, I may go for it although I'd hate to add too much weight to the nose of the car.

I haven't weighed it but aluminum tube is super light and the 1/4" alumalite is well...pretty lite. I built it big because I had hoped to be able to trim it down if I had to balance the down force with the rear wing but in the end I need every bit of front down force I could get. So I left it as is. I also built it as low as I could to try and create fastest laminar flow I could without going so low that it would hit every pebble. As it is now I will scrape the very front of it as I back out of my driveway and pass over the drainage culvert along the sides of the road.

This year I am planning on extending the "flat bottom" past the transmission until it meets the floor boards and then box the sides in with some ground effects to help hold in as much air as I can under the car. Still haven't got it all figured out but that's the plan anyway.

 

[nek]

From Link
Since the air under the car has a shorter distance to travel then the air going over the car it moves faster.. Bernoullis’ principal says faster moving air has a lower pressure and that lower pressure is what causes front down force. It’s that down force that we are after to help balance out the added down force of the rear wing.

Note: The air going above of the car is moving faster then the air underneath ( it needs to cover more distance in the same amount of time). This causes low pressure above which causes lift. A splitter is supposed to be designed in attempt to block some of the air from going underneath the car.

 

[GreenGSX]

From Link
Since the air under the car has a shorter distance to travel then the air going over the car it moves faster.. Bernoullis’ principal says faster moving air has a lower pressure and that lower pressure is what causes front down force. It’s that down force that we are after to help balance out the added down force of the rear wing.

Note: The air going above of the car is moving faster then the air underneath ( it needs to cover more distance in the same amount of time). This causes low pressure above which causes lift. A splitter is supposed to be designed in attempt to block some of the air from going underneath the car.

Take a look at this. You might be over thinking the concept.

How Does a Splitter Work? - Page 1

 

[shleppy]

Any chance of getting this for a 2g? If so then I will absolutely get one, It looks like a really nice piece!

 

[polarmoment]

Take a look at this. You might be over thinking the concept.

How Does a Splitter Work? - Page 1

I think he's just correcting the mis-statement in the link that the air traveling shorter distance moves faster. He's correct, it is the other way around. Using venturis under the car will compress the air and cause it to move faster, creating lower pressure and thus, downforce.

The splitter uses the stacking up of air at the top side bumper to SLOW the movement of air on the top side of the splitter itself (not the whole car). Air velocity under the splitter remains unchanged- it's the slower air stacking up against the bumper that causes high pressure on top of the board.

Mostly just a point of clarification, since it doesn't work on the whole car, just on the nose. It's also worth noting that the closer the splitter is to the ground, the more pitch-sensitive it becomes. Not a problem on a race car with 1000lb/in springs, but on a car that dives and squats at all, it will provide more consistent aero load when it's not as close to the road. The old IMSA GTP cars had issues with this, but their splitters were 1.5" off the ground. That's why you see the raised center section of the splitter on newer prototypes..

 

[bigdoug3022]

damn that looks awesome. did you start selling them yet?

 

[BlackMount]

No, I've been fighting with transmission issues ever since I ordered the material, so I really haven't made much progress.

Between fixing the trans, and have been doing alot of traveling for work lately, just haven't had the time.

However, I will get it made soon enough . Their is track event May 7th, so I'm hoping to have some major work done by then.


I apologize for not staying updated with this !

 

[Achelea]

A bit of zombie fun: Ressurecting old threads.

I wonder, has anyone done anything with a flat bottom to a diffuser on the rear of the car?

 

[Phil1320]

I'd be interested as I'm going to start converting my car from drag to road race before this year is out. Please keep us posted. Thanks!

 

[wvturbo2]

Where did you all get the abs plastic I need a big enough sheet to do under front bumper back to block not using mine for down force but to cover lower part of car and help with air flow

 

[nek]

Take a look at this. You might be over thinking the concept.

How Does a Splitter Work? - Page 1

Yeah you are right as polarmoment has said. The downforce is created only on the lip. I still question the zero velocity assumption. I know its just to prove that pressure increases with lower velocity but I cant see air slowing down to much when we have a radiator directly above the lip.
Also, for some reason Im still not a fan of completely sealing off the rad to the fmic. It may work great for a race car but it seems like a lot of work in traffic for your fans to pull air through your fmic and radiator. Im a fan of a small scoop in the space between your rad and fmic to pull air up and in. That way in traffic, you can bypass the fmic for air. Thats if your car isnt already scraping the ground .

 

[Bud92gsx]

So the sheet of plastic runs 50 bux then? I think you can get the same material at your local lowes/home depot/ menards..I don't know how long the sheet is tho..I just seen it the last time I was there..