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  #1  
Old 01-23-2014, 08:32 AM
Squirrel19 Squirrel19 is offline
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Default Are you guys seeing benifits with a CAI and Catback exhaust?

I'm interested in a CAI and catback exhaust. I just would like to know are you guys getting any better fuel economy and/or HP? If I'm not going to gain something by CAI and Catbake, I'm not going to do it!
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  #2  
Old 01-23-2014, 10:22 AM
Monster5601 Monster5601 is offline
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The only way a cat back and CAI is going to boost engine performance is if the combine components increase the CFMs flowing through the engine and, if the engine controller has the ability to add addtional fuel to take advantage of the increased air flow.

I have looked around for CFM numbers for a stock Hemi and makers of cat back and CIA systems but no one that I found has published the CFMs or what increase in CFMs their system would add.

Without this information there is no way to gauge what, if any, increases will be noted.

I view a CIA as under the hood eye candy. A cat back may offer a new exhaust note that may be pleasing or nothing more than a drone. Hang on to your money until the CFM questions can be answered unless your goal is sound and looks.
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Old 01-23-2014, 11:08 AM
ptesmoke ptesmoke is offline
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I havent finished logging data (its winter...eff that)

but in the summer when I put my CAI on I did notice a small increase in HWY mileage...pre CAI I could only manage 900ish kms per tank, Post CAI I got regularly over 1000kms to a tank.

HP gain. if any, I wouldnt say is noticeable. I can safely say it seems to rev faster (throttle response) and seems to pull alot harder at WOT, again I dont attribute this to HP gain but likely different airflow and the computer reacting to it accordingly. Also on the hwy it seems to cruise at a slightly lower RPM which could explain the slight increase in my mileage.

Regardless, you would likely see the same results with just a high flow drop in filter as the stock tubing and box really isnt restrictive its the crappy paper filters. that being said, where I live a K&N drop in is $115.99. I picked up an AFE Stage II intake with high flow AFE oiled filter for $275, yes more expensive but it looks alot nicer under the hood when your next to a bunch of dirty fords money really wasnt the issue so I opted for the intake so i could have the under hood looks as well. If money is a constraint, and you live in the states, I'm sure you guys have much cheaper means of aquiring high flow drop in filters.

Exhaust is next on my list, not for gains, but sound. I have heard a few buddies trucks who have the corsa cat back and man does it make the truck sound mean when your in the throttle, again...depends on what you want. But im sure with a good CAI, Cat back performance exhaust, and a tune, youd see some gains if you dyno'ed before and after.
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Old 01-23-2014, 01:36 PM
Monster5601 Monster5601 is offline
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Quote:
Originally Posted by ptesmoke View Post
Also on the hwy it seems to cruise at a slightly lower RPM which could explain the slight increase in my mileage.
What are you saying here, a drop in filter can change the physics of the mechanical ratios between wheel speed and engine RPMs? Ok, I'm being a wise-guy, I'm sure I missing something in that statement.
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Old 01-23-2014, 04:45 PM
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rkuhl84 rkuhl84 is offline
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Quote:
Originally Posted by Monster5601 View Post
What are you saying here, a drop in filter can change the physics of the mechanical ratios between wheel speed and engine RPMs? Ok, I'm being a wise-guy, I'm sure I missing something in that statement.
Umm, CAI's add a 9th gear to your 8-speed transmission.......
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Old 01-23-2014, 11:01 PM
ptesmoke ptesmoke is offline
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Quote:
Originally Posted by Monster5601 View Post
What are you saying here, a drop in filter can change the physics of the mechanical ratios between wheel speed and engine RPMs? Ok, I'm being a wise-guy, I'm sure I missing something in that statement.
it was kind of a broad statement.

I dont have any real reason why, but its a noticeable 500 rpm difference with the CAI and cruise set on the exact same spot on the exact same hwy. and no it wasnt the wind lol. my theory was either my engine broke in more? or the CAI effected it. but I mean less RPM, same speed = better mileage? its really the only noticeable difference since the CAI that I could assume resulted in the small mileage gain I've seen. (+100kms per tank HWY)
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Old 01-23-2014, 11:03 PM
ptesmoke ptesmoke is offline
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Originally Posted by rkuhl84 View Post
Umm, CAI's add a 9th gear to your 8-speed transmission.......









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Old 01-24-2014, 12:51 AM
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Yes the truck will run better. Have alot more throttle response and gas mileage will improve
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Old 01-24-2014, 04:26 AM
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Quote:
Originally Posted by ptesmoke View Post
it was kind of a broad statement.

I dont have any real reason why, but its a noticeable 500 rpm difference with the CAI and cruise set on the exact same spot on the exact same hwy. and no it wasnt the wind lol. my theory was either my engine broke in more? or the CAI effected it. but I mean less RPM, same speed = better mileage? its really the only noticeable difference since the CAI that I could assume resulted in the small mileage gain I've seen. (+100kms per tank HWY)
What you are claiming is not possible simply because the speed of the engine is directly related to the wheel speed by gears, a mechanical connection. Changing an air filter is not going to change that nor will wind loading or drag coefficients.


Quote:
Originally Posted by RAMinator13 View Post
Yes the truck will run better. Have alot more throttle response and gas mileage will improve
"Alot" is fairly relative in this context, define "alot". MPG improvement, I doubt it. Given the pressures on makes to squeez every MPG of a drop of fuel, if this were the case, they would quickly change to a different drop in air filter.

Throttle response can only be changed by the speed of the ETC with respect to throttle pedal input, a drop-in filter isn't going to change that.

This all goes back to CFMs, if your current air intake system is capable of flowing more CFMs than what the engine can use, then changing any part of the air intake is fruitless.

Last edited by Monster5601; 01-24-2014 at 04:28 AM.
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  #10  
Old 01-24-2014, 07:49 AM
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To answer your question and clear the fog around all these people who are here to give you engineering facts on an engine.

Honestly? No you won't notice much from a CAI or exhaust. Most do the exhaust for the sound... Like me. The CAI provides that better looking engine bay and the feeling that your helping the truck. I don't think it actually helps much at all.

Most people do these two mods because it makes them happy and that is all that matters.

All of these people who respond to this thread out to prove or disprove the CAI and exhaust are useless. Ultimately you will do it or not based on wether or not it makes you happy.
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