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Old 10-11-2004, 03:08 PM   #1
BURTONRIDR
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Lightbulb Has anyone tried this before???

I recently put a weaponR dragon CAI (a lot of people seem to think these suck, but i dont know why, if you know why let me know) on my 97 subaru legacy outback, so now i am sucking in warm air thats in the engine bay. I want to cool the air going into my engine with a cryO2 system (i hear every 10 degrees you drop the air temp is 1 horse to your engine) and what im planning to do is build a heat shield between the engine and the intake. then im going to coil the CO2 line around my cone filter and intake tube and then run the CO2 line to my radiator to disperse the CO2 on the rediator and cool it down also. and maybe down the road custom fab a top mount intercooler off a wrx to fit my car and spray CO2 on it also. Has anyone done this on a normally aspirated engine before? Is there a point where the air is to cold and robs power or something (im talking really cold air like -20 or something)?
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Old 10-11-2004, 03:36 PM   #2
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well i've never heard of it before, but theres a reason that the throttle body has a small amount of coolant run through it to keep it warm enough during the winter. building a heat shield around the filter is a good idea to keep only cool air going into the intake, but doing anything past that to cool the intake air further isn't going to help you out much, it sounds good on paper, but the pita to pull it off and money involved probably make it not worth it, not to mention your plan doesn't seem all that clear to me, and i don't think it would really cool the air down that much anyways, do you realize the velocity of the air as it gets sucked into your filter? to get an idea, pull the filter off, and stick your hand it there, and rev the engine a little, i doubt you'd get the air much cooler to start with

oh and why does the weaponR suck? i think the filter is garbage to start with compared to other systems, not to mention, if its sucking in warm engine bay air, then its not a CAI, its just an open filter intake, thats the other reason they suck compared to other intakes we can get our hands on
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Old 10-11-2004, 04:29 PM   #3
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I almost positive my throttle body doesnt have a coolant line running thru it. you make a good point about the air moving very fast, and i know it may be difficult to invision without a picture, the way i plan to coil the the CO2 line around the filter is to start at the top of the cone and spiral up the filter, then around the aluminum intake tube, that way the air is dropping in temp as it passes over the coil and then looses more heat as it travels down the chilled intake tube. the CO2 lines and the aluminum intake tube will get so cold they will have frost on them. That stuff is really cold but yea i dont know how much it will cool down the air traveling to my engine, does anyone know if their is a way to hook up a temp sensor to the intake? that way if i do decide to do this i will know just how much the temp is dropping. What does CAI stand for i thought it was Custom Air Intake?
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Old 10-11-2004, 04:31 PM   #4
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lol ok yea im a real blonde i just realized what CAI stands for
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Old 10-11-2004, 04:44 PM   #5
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lol, actually you could probably just tape a temp sensor onto the intake tube and have a readout in the engine bay, and yeah, i realize that co2 is really cold, but keep in mind that air isn't the greatest conductor of heat, and probably won't cool down that much, i wouldn't guess more then a few degrees below the temp of the air coming into the intake

also if you try this, insulate the system from the engine bay as much as possible, your system will be heated up a good amount if their just sitting exposed in the engine bay
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Old 10-11-2004, 04:57 PM   #6
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PM BrysImpreza... he's done it already.
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Old 10-11-2004, 06:10 PM   #7
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Quote:
Originally Posted by americanyouth
PM BrysImpreza... he's done it already.
how did it work? is there any information online?
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Old 10-11-2004, 07:34 PM   #8
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I have a dragon on my 98 L it works fine but i suggest you replace the dragon filter with a regular cone K&N or ractive filter. The foam on the dragon filters are horrible.
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Old 10-12-2004, 10:49 AM   #9
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I have a weapon R intake as well and I just recently replaced the filter with a Green filter and I could tell the defference as soon as I drove away from the shop so as far as the intake itself, it's decent, just not the filter it comes with
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Old 10-12-2004, 02:37 PM   #10
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hmm.. sounds like i need to get a new filter, ill probably get a K&N cone filter. has anyone else heard of the Cryo2 sytem on a normally aspirated engine? I really want more power without an engine swap, no2 or turbo, I like the 2.5l it rocks, the automatic tranny sucks, but the engine rocks.
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Old 10-12-2004, 03:32 PM   #11
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Quote:
Originally Posted by nySulli
not to mention, if its sucking in warm engine bay air, then its not a CAI, its just an open filter intake, thats the other reason they suck compared to other intakes we can get our hands on
That a plus IMO... the shorter tube makes it more responsive, at the sacrifice of what... like 3 horsepower? You can "feel" the responsiveness way more than you can feel 3 hp...

Anyways, just wrapping the co2 lines around the filter isn't gonna do anything. You would need to have something like a little radiator, with the co2 going through the inside and the intake air passing through the fins to get any kind of real effect, or the air going inside and spraying the co2 on the fins. And you still wouldn't get much gain, say you cooled it off by 100 degrees (and I SERIOUSLY DOUBT you're gonna cool it off 100 degrees), that's only about 10 hp, still not really enough to even tell the difference. Maybe if you just sprayed it right into the intake tube it would cool it down, but it would be filling space that would otherwise be filled with oxygen and counteract itself.

Why not just spray nitrous into it, it'll cool it off AND add power, and it's not any added parts or complexity over what you're talking about?
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Old 10-12-2004, 04:30 PM   #12
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Quote:
Originally Posted by BURTONRIDR
how did it work? is there any information online?
Yes, it worked. You'll have to talk to him.
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Old 10-15-2004, 12:56 PM   #13
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Well I decided last night to see just how hot my intake tube gets after running it for awhile and yea it has to be up in the 125 temp range. I think if i build a box around the filter and use pvc to route the air from behind the fog light to where the filter is. Then coil a CO2 line from throttle body down to the filter (including around the filter). Then use heat wrap and wrap the intake tube (over the CO2 coil). I think it will work really well . Ill post back when I've done it.
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Old 10-15-2004, 08:21 PM   #14
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jasona, heres the thing, just cause you have a shorter tube, doesn't mean your intake is more responsive then a CAI, ie the cobb intake filter has probably the same amount of tubing between the throttle body and the filter as your weapon R, as the only real difference is the tube going into the fender instead of just sucking in engine bay air

but your right, you can't hope to cool air down that much in any way through the tube, by the same nature burton, even though your intake tube is that hot, i really wonder how much warmer your intake air is getting as a result, but i've always wondered why few people have tried insulating their intake tube somehow, with foam, or what the heck, why not ceramic coat the outside of it, just tape of the ends and spots where the silicon has to cover it, its pretty small so the coating shouldn't cost all that much
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Old 10-16-2004, 10:51 AM   #15
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the coolant lines running through the throttle body are there for emissions mainly, your air fuel mix wont freeze unless you are driving around in below freezing temps. i bypassed my coolant lines and noticed improved response and the engine ran smoother. at least on my car.
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Old 10-16-2004, 09:43 PM   #16
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I second subyrally's response. I bypassed my coolant lines. It regularly gets around 40 degrees here now, and in the winter, in the 10s. So long as I let it warm up before I go hauling ass, it seems to run just fine. better than before. especially in hot weather. doesn't seem like it's as dead anymore.
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Old 10-16-2004, 09:54 PM   #17
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Quote:
Originally Posted by JonofScio
I second subyrally's response. I bypassed my coolant lines. It regularly gets around 40 degrees here now, and in the winter, in the 10s. So long as I let it warm up before I go hauling ass, it seems to run just fine. better than before. especially in hot weather. doesn't seem like it's as dead anymore.

have you gone through winter w/ them bypassed? im thinking about unbypassing for winter.

we get sub zero temps (once in awhile) and im concerned about the safety!
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Old 10-17-2004, 03:52 AM   #18
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Quote:
Originally Posted by BURTONRIDR
I almost positive my throttle body doesnt have a coolant line running thru it. you make a good point about the air moving very fast, and i know it may be difficult to invision without a picture, the way i plan to coil the the CO2 line around the filter is to start at the top of the cone and spiral up the filter, then around the aluminum intake tube, that way the air is dropping in temp as it passes over the coil and then looses more heat as it travels down the chilled intake tube. the CO2 lines and the aluminum intake tube will get so cold they will have frost on them. That stuff is really cold but yea i dont know how much it will cool down the air traveling to my engine, does anyone know if their is a way to hook up a temp sensor to the intake? that way if i do decide to do this i will know just how much the temp is dropping. What does CAI stand for i thought it was Custom Air Intake?

Look on the bottom, unelss subaru made your TB special. That CO2 going to the radiator is still gona get sucked into the motor bay and is still gona get sucked up by your intake. That CO2 will then take the place of O2 (which is needed to make the big boom in your motor) and will cause you to loose power.
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Old 10-17-2004, 03:54 AM   #19
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Quote:
Originally Posted by subyrally
the coolant lines running through the throttle body are there for emissions mainly, your air fuel mix wont freeze unless you are driving around in below freezing temps. i bypassed my coolant lines and noticed improved response and the engine ran smoother. at least on my car.
Its mainly for really cold climates. Its a safety so that the throttle plate does not get stuck.
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Old 10-17-2004, 10:02 AM   #20
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Quote:
Originally Posted by subiekid
Its mainly for really cold climates. Its a safety so that the throttle plate does not get stuck.
it would have to get around 30below 0 or so for the throttle plates to freeze. it aids in vaporization of the fuel so that it burns cleaner. granted, i am on the east coast and our winters dont get nearly that cold.

the coldest ive been in over here was in pa where we were riding 4wheelers in -5 to -10 degree weather. what really sucked about that, other than rolling the quad over myself, was only being able to use one thick glove due to the throttle.
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Old 10-17-2004, 10:04 AM   #21
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at least that is acording to the education i am paying way too much for at lti.
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Old 10-17-2004, 10:09 AM   #22
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Quote:
Originally Posted by subyrally
it would have to get around 30below 0 or so for the throttle plates to freeze. it aids in vaporization of the fuel so that it burns cleaner. granted, i am on the east coast and our winters dont get nearly that cold.
not true. what about the pressure drop that happens. thats why im personally worried about the plate becomingn frozen.
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Old 10-17-2004, 12:03 PM   #23
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my friend had a scirrocco that he ran a 50shot of nitrous through constantly.
It was often freeze his butterfly valves open, which is not a whole lot of fun. lol.
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Old 10-18-2004, 12:00 PM   #24
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hmm.. im gonna have to look at my intake manifold better, that would suck if the valve got stuck open..
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