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Good Read: underhood temps, airflow, etc.

Old 05-02-2007, 07:29 PM
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Well I'm certainly making my own underpan now and in the future venting my hood, possibly venting my radiator directly out my hood. (i know at least my girlfriend with an MR2 will be).
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Old 05-02-2007, 08:55 PM
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well...looks like I should put mine back :(
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Old 05-02-2007, 09:32 PM
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Originally Posted by samnavy View Post
Circular hole cut in cowl near brake master cylinder (Randall style).
I have this hole in the firewall too, it's there from my previous CAI. I left it open cause I knew cold air would be forced in through that hole and land right on my air filter.

Now I realise that I'm probably screwing my under bonnet pressure up by doing that. I might cover it up and see if it makes any difference to my cooling. On the highway at about 65mph my coolant temp needle sits just above centre...

A good read. And congrats on finding some ***** Hustler! :gay:

I don't want to read another million threads on which year of 1.8 and which head and which pistons and which injectors you should use though...
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Old 05-03-2007, 10:17 AM
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Pretty interesting article.

We do a lot of similar testing, though with a lot more pressure taps, and much smaller and less flow influencing tubes.

All in all everything he said is in the right direction.

One think he didn't touch on though, that is very important with things like radiators and intercoolers is making sure they are sealed well to the fascia openings. Air is lazy, and will take the path of least resistance. It likes to be ducted. You can have the best radiator/intercooler available, but if air isn't actually going through it, it won't do you any good. You see this all the time with tuner/show cars and big front mount intercoolers...huge intercoolers with huge gaps between the fascia openings and the core that you can see the ground through...

Having conducted quite a few windtunnel tests, the increase in flow between a well sealed radiator and one that isn't is quite significant. Not to mention the drag reduction you typically gain as well. It also increases the cooling efficencies while the vehicle is at a standstill by not allowing the hot air exiting the radiator to recirculate around to the front of the radiator.

Feel free to ask any questions, and I'll do my best to offer insight.
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Old 05-03-2007, 11:11 AM
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So I don't know about you guys but I'm actually picking up one of these gauges now.

I kinda am having a hard time deciding something though...I'm trying to decide if I should try to put my FMIC right up to the air dam and block off any gapping then shroud it to the a/c condenser (see radiator) and seal off everything except the undertray. of which i plan to build my own of steel or aluminum sheet.

Or alternatively should I sandwich up the intercooler strait against the radiator and just dam up the gaps that lead elsewhere in the bumper.

I think ideally I would have the FMIC all the way forward with a dedicated ducting back to the radiator, and have a cut in the bumper routed to the top of the radiator with ducting so the FMIC back pressure doesn't build. Course in addition to that I would probably also have a vented hood and the radiator would vent strait out that apposed to into the engine bay.

So, obviously frontward facing scoops and rear cowl induction (be it randall or hood risers) doesn't help things, but what do you guys think of venting out the fenders? I know I've seen quite a few designed body kits for other cars and the Garage Vary beast kit for the miata with rear diffuser has fender cuts for what I can only imagine to be venting. If this would prove beneficial i think sealing off the engine bay and venting this way in addition to over the hood would greatly benefit under car turbulence and help keep the rear planted at high speed.

Oh and I seem to have lost all my undertray bolts anyone know the home depot equivalent? :gay:
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