im interested in getting one of these, but i dont think they are work 250 bucks ...

http://nismo.com.au/pricelists/General/Sky...s/R34airbox.jpg

dont suppose anyone is able ot make one? or has made one? or knows where to get one cheaper?


cheers

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its just some bent and cut sheet metal. make your own
i'll even go as far as to say the pictured one doesnt look like it'd be that effective, as its not insulated, and quite thin, therefore radiant heat will begin to soak that whole box after a while

have a search, theres quite a few threads, including DIY's about airboxes

cheers , ill have a llook

as long as you run some kind of air feed into the box, the radiant heat from the thin wall wont have as much effect.

i use a copy of that partition on my blue car, just modified to take a 100mm intake pipe.

i just made an airbox out of perspex the other day.
i lined it inside with some silver faced heat resistant foam. but it didnt look very subtle under the clear perspex. so i thought i might paint it black on the inside.
in the process of testing paint on a scrap piece, i decided to see how it deals with heat.
i was surprised to find the perspex is pretty damn heat resistant. i placed a piece on my palm, and aimed a jet flame at it till it started to melt, but i didnt get any heat on my palm. i'm impressed !!!
so there you have it. perspex. easy to work with. easy to shape. cheap, and pretty effective.

obviously not painted yet. and i will probably only insulate the side, not top.

Tony just be careful with what paint you use on the perspex as it can actually change its heat resistance and course it to warp easier (found out the hard way)

Underbody car spray (sound deadner) is what we found to be the best, it will not only help to reduce the heat you can make your box out of thinner materials and apply a couple of layers of the spray to add the thickness

If your going to use heat resistant paint for it then paint both sides and clear the outside only

thanks for the tip
i was going to use some regular spray paint on it ('fiddly bits' quick drying). i already tried it out on some scrap pieces, and found it stuck quite well, and looks good. the matt seems to work better than the gloss too.
but i didnt consider that it might affect its properties. it doesnt seem to have penetrated the perspex at all.
why do you suggest painting both sides?

We used spray paint the first time and i scratch the service with some wet and dry the first time in aid of helping it stick. Now im not sure if it was the cheap paint and its materials or the roughing of the surface but after fitting the first box after about 15mins of testing we could smell it, pulled back into the pits and noticed that the paint had started to blister and was damaging the perspex

Second time around i tried a few test pieces as well to see what would work the best, the one that was painted both sides and cleared on the outside seemed to give it that little bit more heat resistance and didn't blister the paint at all (still not really showing signs of heat penetration) after 4 track days and 3 test days.

The one that was only painted on the inside showed signs of wear after a while and started to bubble. All i can put it down to is that its heated up from the outside in and baked the paint in the same way.

If you dont feel like paying the extra money for stuff like VHT you can use standard acrylic. In the final few coats add some clear to the paint to help thicken it before doing a full clear. We paint all our engines/pieces like this and never have any drama's from heat issues.

Main reason the matte working better than the gloss is its final finish when dry, to give the paint that gloss look it has other additives to do so (obviously ) but unless you were to add a few coats of clear to help harden it then the standard spray paints heat resistance is only about 200'C (from memory) something like VHT is about 500'C and your acrylic paint if done correctly the same.

Try not to paint the box when its too cold/hot or you will have sticking issues as well and lead to a shorter longevity of the paint life.

Hope it all works out and post up how it goes

Cheers Ben

ok, thanks ben
at this stage i'm thinking its easier to buy some black perspex
will keep you updated

i said the samething to myself afterwards as well but its all a learning curve hey.

Only reason i used clear was because we had it laying around and i was going to get artsy fartsy and spray it with a carbon fibre look

lol see where being artsy fartsy gets you? NOWHERE !!!
yeah same. i had some clear sheets lying around too.

Can someone host some pics for me and I'll show you my go at something similar ?
Email me peterg@colourdispersion.com.au and I'll send them to you !

Pete just sign up and make your own account on photobucket or use SAU to host them in your control settings

what kind of temps would you expect to see at the airbox anyway?
i cant imagine its over 100c, or even close really. my guess is about 60ish degrees max on the outside face.



upload them in your post, like i did. easy. just make sure the file size is reasonable. nothing massive.