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Old 03-19-2012, 01:31 AM   #11 (permalink)
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Its the only place to put it unless I put it in the hose between the box and the exhaust manifold. But its a dryer hose it doesn't cut it just rips like foil.

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Old 03-19-2012, 06:29 PM   #12 (permalink)
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http://imgur.com/TUQAf.jpg. here is my hai. What do you guys think? Cost 6 bucks to make.
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Old 03-19-2012, 09:42 PM   #13 (permalink)
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dakota1820 -

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http://imgur.com/TUQAf.jpg. here is my hai. What do you guys think? Cost 6 bucks to make.
Looks good to me, but I wonder if it will have trouble circumventing the coolant hose?!?!?

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Old 03-19-2012, 10:02 PM   #14 (permalink)
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What do you mean?
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Old 03-31-2012, 06:43 PM   #15 (permalink)
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What do you mean?
If it's installed and working, then there's no issue. Uninstalled it just "looks" like it would hit the hose to the left of the air filter box.

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Old 04-05-2012, 02:47 AM   #16 (permalink)
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My version, installed on a 96 Saturn SL:
http://members.lsol.net/gop4evr/unlinked/100_3895.jpg



I removed the resonator and plugged the original intake tube. As you can see, I used plain old 2" pvc drain pipe and installed the IAT sensor in the new intake. The small diameter tube works well when driving for better fuel economy. I did not box it in to capture more heat around the intake manifold, but this seems to have a noticeable effect, and it is a clean installation.

My mpg has been slipping lately. It needs a thermostat and the plugs have enough miles on them, plus I have not been as attentive in my economy driving techniques of late. Lifetime average is still over 41 though, with a high of 49.6 on one long trip.
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Old 04-05-2012, 11:50 AM   #17 (permalink)
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It will heat up quicker and get hotter if its insulated. My latest one is insulated all the way from the manifold to the throttle body. I think an IAT temp in the airbox of about 150f is good.

I also think the hot intake tubing looks large and would have problems getting by the radiator hose on my SC1

Sorry, this message board won't allow me to post any pictures
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Old 04-05-2012, 12:58 PM   #18 (permalink)
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I think another point that needs to be considered is the diameter of the tubing. Not just for clearance issues with other hoses, etc., but because of the low air volume being used in economy driving. In my picture above you can just see the large (4") feeder tube going between the air filter box and the throttle body. The high volume of air that this large pipe holds is counterproductive to what we are trying to accomplish, in that the air has time to cool again before it actually gets into the cylinders. It seems to me that the smaller cross section would help keep the velocity of the airstream high enough to avoid heat losses, thus requiring less insulation. The way I figure it, the throttle body on my car has an opening of around 2", so anything larger than that is overkill on the intake diameter. Of course, this line of thinking is in opposition to conventional theories, but we're not concerned with horsepower. I am willing to tolerate slight performance sacrifices (within safety margins) in trade for fuel economy. And of course, not to be too restrictive so as to starve it for air.

And it may not matter that much on the Saturn. The main thing as far as the Saturn engine management system is concerned is to achieve a higher temperature at the IAT so the ECU leans out the mix accordingly. To do that, you need to get the warm air from the heat source to the IAT before it cools significantly. To me this means tubing no larger than is practical. I know I could do some plenum and insulation work on mine to bring it up some, but this is a low budget operation, and I have no scanguage or anything to monitor the actual intake air temp. The last thing I want to do is lean it to the point of some kind of internal damage. Since I can't monitor it, I am staying conservative on my mods.
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Old 04-05-2012, 01:58 PM   #19 (permalink)
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A digital oven thermometer can give you a temp reading. If the temp gets too hot, accelerating performance turns crappy, and spark retards. Fuel economy actually drops if it gets too hot (it was terrible at 195f). My current version has a flapper valve to control hot or cold airflow to keep it from getting too hot.

Insulating the whole thing and then covering/sealing it up with duct tape solved the heat loss problem for me.
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Old 04-05-2012, 03:40 PM   #20 (permalink)
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Thriftee....I would like to know more about the flapper valve you have set up to control intake temp.

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