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  #37  
Old 02-29-2012, 11:17 AM
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Re: Mopar CAI Installed 5.7 HEMI

Regarding heat-soak: I think we've missed explaining the essential piece. Metal will heat up faster than plastic, but (more importantly) it also releases that heat faster than plastic.

Given time, both the metal and plastic will reach the same temperature. Metal piping however, is capable of transferring that heat to the air running through it much more quickly than plastic.

Think of it this way. You get back to your car that has been parked in direct sun. You car is from the 1970's and has both metal and plastic on the steering wheel. Which material will you be able to touch the longest? The plastic. Because it conducts heat to your hands at a slower rate.


(For more information, look up "thermal conductivity" or "heat transfer coefficient".)
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  #38  
Old 03-01-2012, 02:40 PM
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Re: Mopar CAI Installed 5.7 HEMI

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Originally Posted by aleatory View Post
Regarding heat-soak: I think we've missed explaining the essential piece. Metal will heat up faster than plastic, but (more importantly) it also releases that heat faster than plastic.

Given time, both the metal and plastic will reach the same temperature. Metal piping however, is capable of transferring that heat to the air running through it much more quickly than plastic.

Think of it this way. You get back to your car that has been parked in direct sun. You car is from the 1970's and has both metal and plastic on the steering wheel. Which material will you be able to touch the longest? The plastic. Because it conducts heat to your hands at a slower rate.


(For more information, look up "thermal conductivity" or "heat transfer coefficient".)
That would be an issue if we were on a race track and trying to gain every last bit of HP from our engines. In the real world, the sound is probably more important than that last .25 HP lost from heat. IMO.
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  #39  
Old 03-01-2012, 09:48 PM
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Re: Mopar CAI Installed 5.7 HEMI

I can't tell if that tube is metal or plastic?
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  #40  
Old 03-01-2012, 10:25 PM
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Re: Mopar CAI Installed 5.7 HEMI

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Originally Posted by armoredsaint View Post
I can't tell if that tube is metal or plastic?
The Mopar tube is metal.
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  #41  
Old 03-09-2012, 11:31 AM
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Re: Mopar CAI Installed 5.7 HEMI

Just installed the Mopar CAI last night and it is awesome! Not much difference idling but at 2/3rds + throttle it starts to make a nice burble. Instant increase in MPG from 13.7 city to 17 have not taken a highway trip yet but I'm sure it will be near 20 if I'm not wide open!! Heat soak is silly how long does he think the air stays in that tube anyway? At 50MPH the metal tube is not heating the cold air from outside rushing through there thats just crazy talk. Can't wait to add the Mopar exhaust now.
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  #42  
Old 03-10-2012, 09:44 AM
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Can't believe a 3mpg increase, or jeep would have installed it as std to avoid all the bad publicity about poor mpg.

As far as metal goes, it serves as a heat sink and the air rushing it is the coolant. The heat does transfer to the air, and if you look at cai studies the internal air temp varies significantly based on design and material of the tube.

That said, who cares? If it looks good and sounds good, that is what I am after!
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  #43  
Old 03-10-2012, 12:16 PM
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Re: Mopar CAI Installed 5.7 HEMI

It seems to be more about the heat that gets transferred to the IAT sensor, causing it to be inaccurate. A high IAT pulls timing, so for best performance you want the IAT to be measuring the intake air temp, not the engine compartment temperature. There is a surprising amount of heat transferred to the air via the metal tube (the air is not moving that fast in the tube), but I don't think that makes as much difference as sensor offsets. I think I read of someone picking up a couple HP by moving the IAT out near the AF. I think I also read that gluing on a hemi badge on the front fender adds a couple HP too
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  #44  
Old 03-10-2012, 01:14 PM
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Re: Mopar CAI Installed 5.7 HEMI

One HEMI badge on the tail gate enhances the aerodynamics as well.
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  #45  
Old 03-12-2012, 09:13 AM
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Re: Mopar CAI Installed 5.7 HEMI

I need to get me one of these, for sure.
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  #46  
Old 03-12-2012, 10:22 AM
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Re: Mopar CAI Installed 5.7 HEMI

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Originally Posted by aimpulsive View Post
Can't believe a 3mpg increase, or jeep would have installed it as std to avoid all the bad publicity about poor mpg.
Agreed...whoever said they were getting a 3mpg increase needs to do a long term study. Did you drive the exact same roads w/ the same ambient temp at the same speeds to get that reading? I call bull$hit...
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  #47  
Old 03-13-2012, 03:50 AM
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Re: Mopar CAI Installed 5.7 HEMI

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Originally Posted by bmrisko View Post
Agreed...whoever said they were getting a 3mpg increase needs to do a long term study. Did you drive the exact same roads w/ the same ambient temp at the same speeds to get that reading? I call bull$hit...
and was it done just after installing it!

I noticed an increase in economy when I installed the volant but after a couple of weeks it re learned and now back to were it was before.
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  #48  
Old 03-13-2012, 01:46 PM
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Re: Mopar CAI Installed 5.7 HEMI

Quick update I always have the Jeep in sport mode except when there is deep snow but the intake is very noticeable. I forgot the other day and drove it a couple miles in auto and could not believe the difference. It has to be the ECU trying to keep stock parameters even the burble and mileage gain were not there. After a more extended test sample the mileage has leveled off around 15.5-15.7 which is still almost 2mpg more. Thinking about getting the exhaust but was curious if anyone else has the Mopar exhaust installed.
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