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Old 01-24-2007, 10:24 PM   #1
Patrick Olsen
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Cool Laile/Beatrush underpanel for BD/BG installed

Underbody aerodynamics is something I've been wanting to fiddle with for a while, and not too long ago while bouncing around various JDM parts websites I discovered that Laile makes an underpanel for the BD/BG (part #S561010). Their website says it's for turbo models, but I figured I could make it work - it's just aluminum, so if I had to trim it here or there it wouldn't be too hard.

Of course, nobody actually carries it here in the States, but I looked around for places that carried Laile/Beatrush parts and emailed some of them. I ended up going with www.cyberauto.com, which is actually a few different websites. They had the best combination of price and shipping time. I wasn't expecting it to appear until roughly the end of the month, but last Friday it showed up. Woohoo!

Today I put the car up on a lift and installed the part. As expected, there was some interference with the exhaust, but some "spacers" and longer bolts took care of that without any real issues. The panel is aluminum, as I said, probably about 1/8" thick (well, probably 3mm thick, since it's from Japan and most likely metric). At the front end it mounts to a plate that goes across the bottom of the radiator support:


On each side there's a little bracket that hangs down from the front bolt of the sway bar bushing mount:

The JDM cars have different bushings with flat brackets, whereas the USDM cars have those kinda weird humped brackets. So you can see the chassis end of the bracket got deformed when I tightened the nut down. No big deal, it's just aluminum.

At the rear of the underpanel there's a bracket that bolts to the cross-member, and that's where I had some interference issues. I figured there would be problems with the exhaust, as the underpanel is designed for a turbo car (with the exhaust above the cross-member). Sure enough, I was right:

Not the best pic, but with the bracket touching the OBX header, the flange was about 1/2" from the cross-member. So I bought a couple longer 8mm-1.25 x 40 flange head bolts to replace the original bolts, and then used a couple 10mm nuts on each one as spacers, like so (again, pardon the crappy pictures, not much light under the car so the flash was throwing lots of shadows):



With all the brackets in place, I bolted the underpanel on:



Butt dyno says the car is about 1/2sec quicker to 60, and I can hit 87mph at redline in 3rd instead of just 82mph before.

OK, just kidding. The next time I take the car to a track day I'll probably try running with and without it to see if there's any change in front end stability at speed. I can already see a couple things I want to fix. I'm not sure what the big hole in the middle of it is supposed to be for, since all it does is allow you to look at that plate that bolts across the cross-member. So I'll cover that over with a piece of sheet aluminum to make the bottom that much more smooth. Also, the plate slopes up at the front, which isn't really necessary and may actually be suboptimal, so I think I'll flatten it out. I'll probably end up attaching it with just a couple bolts to the bottom of the bumper (the black portion) where it overlaps. I'll also probably widen it at the front so that it extends all the way out to the edges of the bumper. Anyway, it's a good start, and although I could probably recreate something like this pretty easily using aluminum sheet from Home Depot, that stuff isn't as thick and sturdy as the Beatrush piece is, so I'm pretty happy with this.

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 01-24-2007, 10:25 PM   #2
fibuz
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Sweeeet!
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Old 01-24-2007, 10:54 PM   #3
b4u
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more beneficial for someone who rallys, but freakin pimp. i'd pay u to make me one!
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Old 01-24-2007, 11:44 PM   #4
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Quote:
Originally Posted by Patrick Olsen View Post
I'm not sure what the big hole in the middle of it is supposed to be for, since all it does is allow you to look at that plate that bolts across the cross-member. So I'll cover that over with a piece of sheet aluminum to make the bottom that much more smooth.
It's probably there so you still have an accessible center jack point. Otherwise, you'd have to jack each side out at the sills.

It's a very nice looking piece of aluminum.
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Old 01-25-2007, 12:37 AM   #5
Patrick Olsen
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Originally Posted by b4u View Post
more beneficial for someone who rallys, but freakin pimp.
It's not intended to be a skidplate, it's an undertray to improve aero. Much like all the newer Subarus (and many, if not most, other new cars as well) have from the factory.

And, yes, KD7000, BIGSKYWRX pointed out that rather obvious purpose to me, too. My car is low enough that I generally jack from the sills anyway, but I would have figured out what the hole was for probably a few days after I covered it over.

Pat
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Old 01-25-2007, 01:02 AM   #6
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Nice, looks like a clean piece of work.

Beats my 3/16" homemade skidplate in the looks dept. that's for sure
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Old 01-25-2007, 03:11 AM   #7
that one legacy
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sweet! how much was it + shipping?
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Old 01-25-2007, 08:33 AM   #8
Jonathan
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I see the access hole for the oil drain, but what sort of access do you have to your oil filter ? To me the big reason why I have yet to install any form of "skid plate" or an under body "aero deflector" is do to this issue.

Any thoughts on remote mounting your oil filter somewhere more accessible so you don't have to drop this panel each and every time you perform an oil change ?
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Old 01-25-2007, 09:14 AM   #9
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Looks nice, Pat!

I used to make skid plates and I can tell you that making something like this from scratch would be a PITA. Relocating the oil filter would be more of a challenge than removing the skid plate for every oil change. It's not that bad really, there's only 8 bolts and it might add 15 minutes. Oil changes should not be rushed anyways. They are a good time to check out the underside of the car and make sure that there are no leaks, torn CV boots, etc.

This plate would definately not work with a non turbo subaru that still had stock or Borla replica headers. The OBX headers give tons of clearance and you can fit most skid plates meant for turbo subarus (this applies to impreza, forester, and outback models also).
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Old 01-25-2007, 02:06 PM   #10
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Off Topic: What kind of oil filter is that?
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Old 01-25-2007, 02:20 PM   #11
that one legacy
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Off Topic: What kind of oil filter is that?
looks like a Purolator PUREone, a pretty good filter for the money.
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Old 01-25-2007, 07:41 PM   #12
Patrick Olsen
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Yup, Purolator.
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Old 01-25-2007, 08:23 PM   #13
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Hey Pat, did you get a bigger oil filter along with the oil cooler setup I see there?
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Old 01-25-2007, 08:34 PM   #14
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I was going to go way off topic and start mentioning all the interesting things seen under his car (like duct tape and brake vents) but I don't see anything indicating an oil cooler.

Ahh, maybe it's what looks like aluminum the filter is screwed to.

Where's Waldo?
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Old 01-25-2007, 08:46 PM   #15
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Nice work Pat!

I'm sure Pat will step in at some point, but IIRC he's using that sandwich adapter as a point to mount aftermarket oil pressure/temp sensors.

Oh, I would guess that hole under the center plate is because a lot of people (me included) use it as a jack point
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Old 01-25-2007, 08:49 PM   #16
Russell Rogers
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It looks like there are an fittings coming from that sandwich adaptor.... if you are running one;what oil cooler kit are you running I am looking for one for my car and am getting ideas.......

btw i like the underpanel alot, If i hadn't already bought sheet aircraft aluminum for mine i would buy that one.... good install
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Old 01-25-2007, 11:45 PM   #17
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Quote:
Originally Posted by that one legacy View Post
sweet! how much was it + shipping?
I would like to know this also

Looks like a pretty nice plate.
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Old 01-26-2007, 03:49 AM   #18
Patrick Olsen
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Quote:
Originally Posted by rougeben83 View Post
Hey Pat, did you get a bigger oil filter along with the oil cooler setup I see there?
Quote:
Originally Posted by flanders View Post
I was going to go way off topic and start mentioning all the interesting things seen under his car (like duct tape and brake vents) but I don't see anything indicating an oil cooler.
Quote:
Originally Posted by Dan Cech View Post
I'm sure Pat will step in at some point, but IIRC he's using that sandwich adapter as a point to mount aftermarket oil pressure/temp sensors.
Dan is correct - no oil cooler (yet). The sandwich adapter is just there so I could mount an oil pressure and temperature sending unit. I've since moved the temperature sending unit to the oil gallery at the top of the engine, so only the pressure sending unit is still in the sandwich adapter.

As for the duct tape on the bottom of the bumper, that's just some very ghetto radiator ducting to ensure air coming through the lower opening in the bumper is forced through the radiator and can't escape by passing under the radiator support. That was a precursor to doing some more "real" ducting, which this underpanel is the beginning of.

Quote:
Originally Posted by Wiscon_Mark View Post
I would like to know this also
Cost was about $225 shipped. Basically, all of the vendors I emailed said the price of the underpanel was the same - about $180. A couple of the vendors I emailed said they could ship is sloooooow for about $45 or so, or fast for about $100. Cyberauto.com did it fast for $45, so that's who I went with. They said it would take 3-4 weeks, but in actuality it was only 10 or 12 days. Not too shabby.

Pat
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Old 01-26-2007, 01:33 PM   #19
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Mach III here in San Francisco apparently carries the Beatrush products.

I'll contact them and see what they have to say about getting this.
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Old 01-26-2007, 09:25 PM   #20
dplacen
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Nice Plate!
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Old 01-28-2007, 02:15 AM   #21
Patrick Olsen
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It would appear the underpanel actually improves airflow. Doing some highway driving this afternoon/evening, my steady state temp at 75ish was about 83-84C on my Defi gauge pack. Previously, the temp would stabilize at about 86-87C on the highway. When I slowed down, the temp would go up to where it used to sit. Interesting...

Pat
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Old 02-07-2007, 03:18 PM   #22
flanders
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I talked to a shop that will do a group buy for this piece. If 10 people get in it will be $130 each not including shipping. The piece is large so shipping will probably put it around the price that Pat paid.

I am not affiliated with this shop, just trying to help you guys out.

Send me a PM if you are interested.
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