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Looking at some cooling options for a Greddy turbo and one that was suggested was a vented hood / bonnet. Are their any suppliers in Australia?

Do a search for " DIY Extraction Hood" on the miata.net forum. Cheap and beautiful.

The forum sponsors have one on their web site - listed under the 'coming soon' category.

Click on the banner at the top of your screen.

$900-$1400 *faints*. Another week of eating bread only

zhenjie wrote:$900-$1400 *faints*. Another week of eating bread only

not to mention the lack of structural rigidity! which = illegalness! Imade a new word!!
CF is also illegal for steet as well but i prob don't need to tell yall that

What's wrong with just adding an intercooler?

Some ceramic coating will reduce underbonnet temps.

I remember many years ago when I had a Commodore Turbo that you could buy vents which you just inserted into the bonnet after you've cut out the appropriate hole in the bonnet.

To me, this is the best way to go as not only is it cheap but doesn't affect the crumple rates of the bonnet and is much safer than a CF or fibreglass bonnet.

What about old-fashioned louvres? I dunno what they cost but I'd imagine if you punched a row of two of them it wouldn't harm the strength of the stock bonnet.

put some washers underneath the bonnet to lift up the rear and remove the rubber - this helps especially if you have a tight budget......

fd3s wrote:put some washers underneath the bonnet to lift up the rear and remove the rubber - this helps especially if you have a tight budget......

This 'method' is even worse than fitting a carbon fiber bonnet!
and besides that the stud out of the bonnet is only 12mm long so you would have to extend the stud to get it to work

what happens when you have a front impact? the bonnet wont catch on the designed catches and the hinges are not sandwhiched onto the bonnet frame therefore they will just shear straight off

some cars (supras etc) especially those you see this done often too have a big catch just forward of the hinge so the bonnet grabs in the event of an accident
if they don't catch you might as well duck cause the bonnets gunna come right back at you!

then there is the legality of the rear fire wall in the engine bay being sealed to prevent an oil/lubricant spray contained in your engine bay and not up your windshield where it could cause more problems!

Sure these might be a one in a million things 'that might not' occur but it will be that one time that you wish you didn't fiddle with something you shouldn't have that gets you!

panels were designed on cars to protect the persons inside alter the hinges/catches/mechanisims or make them operate in an adverse direction than they were intended an you are affecting the whole cars' resiliance to a crash

You want holes in your bonnet the only legal way to do it is to use vents like benny sudjested ie from SSV or similar ie WRX front vents/cosworth vents/XR6/XR8 so on and not cut the structural ribbing behind the bonnet

thats all true and dandy but then you shouldnt mod your car either cause sh)t happens

if your engine does go into flames the rubber would melt under the bonnet and effectively be no better off - if you raise the bonnet that millimetre or two... as many race cars do it.... but it all in the name of performance.

fd3s wrote:thats all true and dandy but then you shouldnt mod your car either cause sh)t happens

Yeah that happens too but LM had genuine safety concerns with his post. I personally wouldn't want a bonnet to slice my head off or deflect off the windscreen into an innocent bystander, but hey, horses for courses I suppose.

the aluminium bonnet is more likely to bend before the bolts share off...

fd3s wrote:the aluminium bonnet is more likely to bend before the bolts share off...

That is the design intent! but change any charachteristics and you risk changing the out come

Just remove teh rubber bit ontop of the firewall - does away with pretty much all of teh problems LM points out, costs nothing, is easy to do and still keep factory appearance...