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Old 03-27-2009, 07:48 AM   #51
ADAS1223
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Quote:
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Where can you get a $75 skid plate? Hook me up.
Oh nvm, a local had one for sale for $70 and he was gonna make more but upped the price. I just checked the thread and he said there's not enough interests to make more... eh. i was out dated
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Old 03-27-2009, 03:13 PM   #52
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So someone who has actually finished one of these, can you make a diagram of the finished product with dimensions? The best would be to do it like the member did on the previous page with the stock skid plate, but obviously show all the dimensions for the new one.
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Old 04-14-2009, 01:40 PM   #53
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I'm starting a project on one out of 3/16" Aluminum, I'll post up what I come up with.

Last edited by T-37; 04-14-2009 at 01:40 PM. Reason: punctuation = fail
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Old 04-14-2009, 01:48 PM   #54
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Just go to home depot and buy a 1/4" - 1/2" piece of wood, cut it, and bolt it up.
It's underneath, so no one will ever see it, and it's only a couple bucks so it can be replaced as often as you feel like.



If you're really worried about what people think, just paint it black and slap a sticker on it. They'll think you're cool.
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Old 04-14-2009, 01:54 PM   #55
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I can see a couple problems with wood:

-If it breaks because you actually hit road debris, etc it will splinter and could do all sorts of damage. At least the aluminum will just dent.

-If a piece of 1/2" was used, it will as heavy or heavier than some of these designs, like the street signs.

There are some great DIY designs in this thread....subscribed.
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Old 04-14-2009, 02:13 PM   #56
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Quote:
Originally Posted by justincredible View Post
Just go to home depot and buy a 1/4" - 1/2" piece of wood, cut it, and bolt it up.
It's underneath, so no one will ever see it, and it's only a couple bucks so it can be replaced as often as you feel like.



If you're really worried about what people think, just paint it black and slap a sticker on it. They'll think you're cool.

I already have the aluminum





don't use wood....anyone
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Old 04-14-2009, 08:25 PM   #57
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I'm trying to make a template now out of cardboard ... but where do you guys find the aluminum sheet metal? and for what price?
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Old 04-14-2009, 09:05 PM   #58
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head to your local steel supply shop and pick up some alu sheet.
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Old 04-14-2009, 09:12 PM   #59
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Originally Posted by Nick-subiefan View Post
I'm trying to make a template now out of cardboard ... but where do you guys find the aluminum sheet metal? and for what price?

You will have to go to a local shop for the aluminum, like an industrial supply type store, or maybe a salvage/scrap yard. Its also important to keep in mind, if you want something pretty heavy duty (1/8" or thicker), you are more than likely going to need access to special equipment to bend it (brake, blowtorch, ect).


Edit: I got a piece of 3/16" thick cut to 27" X 42" for $56. But I can totally understand the pricing of the Primitive and Rally Armor skid plates, considering the material cost, and the labor involved in cutting, bending and drilliing 3/16" thick aluminum.

Last edited by T-37; 04-17-2009 at 12:42 AM. Reason: Added price
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Old 04-14-2009, 11:53 PM   #60
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Also worth looking into is Ultra-High Molecular Weight Polyethylene, it's what they use for underbody protection on rally cars.
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Old 04-15-2009, 01:01 AM   #61
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^^ Sounds expensive
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Old 04-15-2009, 03:01 AM   #62
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Quote:
Originally Posted by DeathSStar View Post
I can see a couple problems with wood:

-If it breaks because you actually hit road debris, etc it will splinter and could do all sorts of damage. At least the aluminum will just dent.

-If a piece of 1/2" was used, it will as heavy or heavier than some of these designs, like the street signs.

There are some great DIY designs in this thread....subscribed.
And all that ignores the greatest problem with wood, namely that it will swell with water and rot. When it rots it will crumble and break, sending bits of debris out behind you as you drive.

So you get all the bonuses of having moisture trapped up against your under carriage added to the joy of flinging stinky pieces of rotted wood at other drivers.
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Old 04-15-2009, 03:14 AM   #63
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When I mad ea custom skid plate. We aquired am alluminum road sign. Took a razor and cleared it of unwanted letters. Made the template out of cardboard. hit with a buzz wheel, smoothed teh edges down a little. Put the 5 bolt in the subframe and then dabbed them with grease and started from there with finding the exact spot for the holes. once it was all bolted up we scribed a line across the front leading edges and then sat teh skid plate on a word bench and bent 2 inches of the leading edge up wards about 45 degrees.
The street sign is great thicknesss for rally x and other play. we didnt get into assesories holes. its a quick 5 bolts me personaly im not worried about that to change oil and what not. But its has held up strong plus its very cheap, head to teh local road commission. scrap yard.
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Old 04-21-2009, 04:59 PM   #64
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I found some 1/8 Aluminum sheet in a piece of 4ft x 4ft for the low price of $27 a piece.
The place is called Berlinsky Scrap Metal in Joliet. If anybody from the area wants some I think they have at least 2 more sheets.
All the Scrap metal places I asked so far would not sell metal, specially the road signs.
After I finish mine I'll post the diagram and pics of it on and of the car.
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Old 04-23-2009, 04:01 PM   #65
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Here are some pics of my home made Skid Plate. It's not 100% done yet.
It needs a couple of bends and mounting holes. The holes that are in it now were there in the Aluminum sheet when I got it. I'm also thinking to paint it.


Do you guys think that there might be an issue with the air from the engine bay beeing trapped there? It looks like it has room to get out around the transmission area.
Is that enough? I don't want to mess the air flow and overheat the engine at Auto-X and Track days.
Thanks guys.
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Old 12-06-2009, 12:45 AM   #66
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I'm looking into making my own skid plate as the materials used in the ones offered seem to be 3003 aluminum with a tensile strength of 16,000 I don't want a flimsy plate and don't want to go thick and heavy just to gain strength I'm thinking 7075 T6 with a tensile strength of 83,000 PSI or at least 6061 T6 which is 45,000 PSI. A piece of 3003 would have to be 1" thick to get the same strength as a 1/8" thick piece of 7075 T6. I'll come back here and post what I find out just in case anyone is interested.
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Old 12-09-2009, 11:32 PM   #67
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the primitive skid plates are made of 5052. so far ive been priced 170-215 for a 4x4 sheet of 3/16...gonna see if i can kind cheaper or a road sign ....but if its good enough for the primitive plate id say good enough for me

Quote:
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I'm looking into making my own skid plate as the materials used in the ones offered seem to be 3003 aluminum with a tensile strength of 16,000 I don't want a flimsy plate and don't want to go thick and heavy just to gain strength I'm thinking 7075 T6 with a tensile strength of 83,000 PSI or at least 6061 T6 which is 45,000 PSI. A piece of 3003 would have to be 1" thick to get the same strength as a 1/8" thick piece of 7075 T6. I'll come back here and post what I find out just in case anyone is interested.
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Old 12-11-2009, 06:37 PM   #68
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5052 has a tensile strength of 33,000 and at 2.619 lbs per square ft in 3/16" thick. It will be around 26 lbs (I figure about 10 sq ft). You can get a 3x4 sheet for $115 at onlinemetals.com. You can get a 3x4 sheet of .071 7075 T6 for $116.47 and at 1.0428 lbs pr sq ft it will be about 10 lbs and about the same strength. 7075 isn't weldable though so you would have to find another way to fasten the spacers on the back two bolt holes.
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Old 12-11-2009, 06:54 PM   #69
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Subscribed! Great work to those that have posted pics.
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Old 12-11-2009, 10:25 PM   #70
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5052 has a tensile strength of 33,000 and at 2.619 lbs per square ft in 3/16" thick. It will be around 26 lbs (I figure about 10 sq ft). You can get a 3x4 sheet for $115 at onlinemetals.com. You can get a 3x4 sheet of .071 7075 T6 for $116.47 and at 1.0428 lbs pr sq ft it will be about 10 lbs and about the same strength. 7075 isn't weldable though so you would have to find another way to fasten the spacers on the back two bolt holes.

yea never bothered to look up tensile strengths so if you want the toughest stuff get 7075 id say...but as you mentioned its not weldable so you need a sheet big enough to do what you want, and im gonna have the 'wings' like the one posted above and would rather have 1 piece either welded or solid. im liking this street sign idea, especially leaving the lettering and such intact. anyone know where i can get one in northern NH or bangor area in ME
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Old 12-16-2009, 09:27 PM   #71
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If I end up doing this for mine ill post dimensions for all of us 08/09 guys (for the 2.5i atleast, Im pretty sure the STI and WRX underbelly is different )
bump for this
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Old 12-16-2009, 09:37 PM   #72
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I still got to get around to making a template for mine. My friend gave me a piece of 1/8" 3.5'x3.5' 6061....he works at a machine shop and it was a divider between alum. locks for a project...so it was "scrap" for them

chris
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Old 12-16-2009, 11:00 PM   #73
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Been thinking of making some for my rpm sub frame. Where would I get the sheet metal?
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Old 12-17-2009, 11:48 AM   #74
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^ at your local home depot
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Old 12-17-2009, 12:38 PM   #75
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News to me. As they carry limited metal.
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