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Old 07-16-2008, 08:50 PM   #1
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Question -- WAI -- The debate of where to route it...

Air right behind the radiator
Since the coolant passing through it is regulated to around 180 degrees, the air coming out is always at a certain temp and there is no chance of it exceeding (lets say) 220 degrees... so it is much more controllable and better in my opinion. Again the air that the engine will be sucking out of the radiator should be around 180 degrees most of the time.

Right by the exhaust manifold
This would provide much higher temperatures (maybe), but it is uncontrollable as to how hot it can get.


.... ??
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Old 07-17-2008, 04:44 AM   #2
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I used the exhaust manifold because the temp of the radiator is 180 but the air has to be warmed up as it passes by the heat source. you have to have a significantly hotter heat source then the end temperature you want for this reason. if the water temp is 180 then the air passing over the hose will never get over 180 but may also never get anywhere near 180 because it doesn't have time to soak up much heat from the hose before it is sucked into the eingine.

I am sure that my header has gotten much hotter than the 179 max that I have seen on my intake. the fact of the matter is that the air just doesn't have the time to take enough heat from the source in the small amount of time it has passing over it in transit.

I have seen headers glow cherry red. I don't know what temp it takes to do this but I am pretty sure that it is well above 180 or even 220. I say that if you are having issues with intake too hot, then space your intake tube farter away from the header or just don't use a heat shield.
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Old 07-17-2008, 05:17 AM   #3
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For some, using the exhaust manifold isn't possible. Mine are not that large, and fully wrapped in heat shields. Due to the V6 design, routing the air to a viable heat pickup point puts it directly under the throttle body and subsequent air intake piping. I have yet to figure out the optimal placement besides just placing it behind the radiator.

And the last time I saw a header glow was after a 15 mile super sprint in the 626 GT; the turbo was quite hot!
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Old 07-17-2008, 06:58 AM   #4
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Well I was planning on placing a gutter type shield right in the radiator so air could be trapped and actually be heated up like so...



(Just to give you an idea of a little box to trap the air)

And then simply connect the air tube to that box.
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Old 07-17-2008, 07:23 AM   #5
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There won't be trapped air, because the intake is still going to suck it through.
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Old 07-17-2008, 07:41 AM   #6
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if you think about the volume of air going into the engine, think about the exhaust. I know that the air has expanded because of heat, but for a simple comparison. see how much the exhaust is blowing out. that should give you an idea of the amount of air going in. it is going to be hard to quickly heat that volume of air using a source that is the exact temp that you want the air.

someone else has mentioned running the air over the cats. well, sucking the air from around the cats because they get pretty hot too. that might be a solution if you can't get to the header

when I say header, I mean exhaust manifold. I am WAY too cheap to actually put money into a performance header.
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Old 07-17-2008, 08:22 PM   #7
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almightybmw - assuming youre thinking of the grand prix, and if youre using the stock airbox, be mindful that the pcm is in the airbox
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Old 07-17-2008, 10:27 PM   #8
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almightybmw - assuming youre thinking of the grand prix, and if youre using the stock airbox, be mindful that the pcm is in the airbox
Yeah, I'm aware of that. From reading CAI installs I know where I could place it without affecting too much. So far the only places I've found that endorses WAI are the FE forums, and I haven't found anyone who has done a WAI on a GP on my years. And the GP forums don't support power robbing mods, so they get bashed pretty hard.

I'll keep studying my diagrams and fsms, see what I can produce.
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Old 07-18-2008, 07:14 AM   #9
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On most FWD cars you could place the pod filter, or whatever you decide to use, between the engine and rad fan. Most FWD cars have the exhaust manifold to the front of the car too. This of course won't work on a FWD V6.

What do you drive? Got a pic of the engine bay?
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Old 07-18-2008, 02:54 PM   #10
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No thats the thing my exhaust manifold is in the back so the tube would be pretty long... I dont know if there is a maximum length but it looks pretty long to me that why the radiator (RIGHT in front of the airbox) seems better....
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