Madrx7racer

I am currently piecing together a small custom FMIC and I want to make an undertray with vents for my oil cooler and radiator. In order for you guys to understand wtf i'm visualizing in my head I need the following from someone.


1. A high resolution pic of a STOCK undertray OR
2. A pic of an FC with the Border/corksport type 1 FROM BELOW ( car on a lift and you underneath it)


here is a rough idea of my plans:








my FC did not have the underbelly so I can't measure that.......I don't have my front end yet so I can't mock anything up. So I was wondering if you guys could hook it up with some pics and thought on this possible project of mine.

ANY sort of feed back that will help me fix or improve something is always wanted.

Madrx7racer

If I get my front end soon I'll go ahead and post updates

Digi7ech

iTrader: (1)

Here is a ghetto pic of what I would do.

I would think you would get more airflow from this point instead of trying to pick up off the undercar airflow.(Unless you made a small lip to scoop air off the ground)



If some one with fluid dynamics or something has real proof go for it. This is my guess at what would work.

Madrx7racer

yeah.....I was thinking of creating a wide scoop on the sheet metal but like I said I need a pic of the bottom of the kit or at least a stock undertray.....the problem with the drawing you made is that the IC is parallel to the ground and mine isn't......look at the pics I pposted above and look at this pic with the STOCK bumper on:

Madrx7racer

As soon as I get my front end I can finish this FMIC and drive my baby again.......it's been a while since I've driven my car......

Black91n/a

Do one of these, should be good for cooling, shouldn't cost a lot, shouldn't be hard to do.

Liquid Anarchy

iTrader: (2)

I think you'd want to do more like this. Air going through the oil cooler is probably going to be warmer than water at the bottom of the radiator. That and stock there's a metal plate behind my cooler in effort to duct air away from the radiator.

ZeroDrift

iTrader: (1)

gasp! Those are ADR DTM rims... I used to have a set of those for my old civic.. In fact, I have 1 rim left... its a 4 lug design.. pm if you want a spare

I too plan to make an undertray for my car come summer. I am planning to incorperate it into an extensive underbody aero project, ending w/ a rear diffuser. And I believe having the oil cooler vent beneath the car is better than having it vent into the radiator.

hondahater

iTrader: (2)

so are you using a special hood like in that picture?

Madrx7racer

I am still in design stage so nothing is final.............I will consider all your guy's input when it reaches final stages. YES they are ADR DTMs and I'm going to powdercoat them in dark bronze eventually. As far as the hood I will be making a custom hood out of an NA ( have 2 aluminum hoods in case I mess up on one.) much like my friend Jaiyurai......can't find pics........I kinda like the "scoop" on the 3rd gen posted above but it will be TOO low and it WILL get destroyed in no time

Madrx7racer

I would still like pics of the underside of an FC or the underbelly tray if anyone has them please.

Black91n/a

I'd post pics, but I don't have any. That scoop was actually on a miata. Be careful of doing a full flat underbody. You MUST leave an opening in the rear of the engine bay to let all that air that gets in the front out of the back. Someone with a miata did a full underbody and his car overheated after 3 laps due to a lack of airflow through the radiator etc due to the air being unable to escape effectively. I'd think that running a splitter/diffuser in the front up to about the axle line would be good then there's little to be gained by coating the underside with panels. A rear diffuser will add some downforce though. Also be sure to let the exhaust system get some cooling air or it may get ugly under there.

Good luck with the project.

Madrx7racer

good suggenstions.......I was also going to either get or make a vented hood to help with the heat expulsion....I will eventually get the CF rear diffuser (CF so it won't shatter on bay area roads )

Valkyrie

I'd also like to see a pic of the stock undertray... since I don't have one.

I think a simple sheet metal peice that goes from under the lip (+1 if it's an aftermarket or T2 lip...since you can suck more air in that way), to the bottom of the oil cooler, and then upwards to the bottom of the radiator, plus some panels on the side of the radiator would work just fine... just two bends in the piece, and bolt it to the various parts (you have to be able to take it out, of course... so rivets would be a bad idea).

Basically, you're just making sure all that air actually goes into the air damn, through the FMIC, oil cooler, radiator, and then back out into the engine bay, where it will probably be sucked under the car. Rather than just going straight under the car... a lip does nothing without an undertray.

Apparently there's one company that sells a sheet metal undertray, but it's like 250 bucks, which seems a lot considering it's just a flat peice of sheet metal that's been traced out and cut.

So, get a big *** peice of sheet metal, put it under your car's lip, and trace the shape out, then cut that shape out, and then trace where it needs to bend, and the angle, then bend it, drill some holes in the right places, and bolt her up.

A lip, some sideskirts, and a rear diffuser, combined with some undertrays would sure make for some nice downforce (theoretically), and look cool too... it would also help the undertray do it's job by sucking the hot air out of the engine bay.

Canards and a rear wing are nice for downforce too... The problem with groundeffects is that they're bad if you have a lot of curbs to worry about... or a steep driveway (like me...I've got my doubts as to whether I can get out of my driveway with the stock ride height and body work). And the problem with GT wings and canards is that they look silly. :p hehehe...

'87 turbo II

iTrader: (1)

also the radiator is slung lower for a lower center of gravity not that a radiator would matter much, track guys kill to shave an ounce or two, so why not want to move that ounce lower (really like what 2 pounds for an aluminum radiator)?