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Old 07-30-2014, 09:21 PM   #1
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JLT Intake Concerns

Okay guys I've had my JLT CAI on my 2012 stang for about 1 1/2 months now, and honestly I feel like I've lost a bit of power. The one I bought said it didn't require a tune, and yes it makes it sound and rumble ALOT nicer, but I feel like I'm so sluggish on the road now. Anybody know why or had the same experience?


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Old 07-30-2014, 09:29 PM   #2
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I don't have one on my Mustang but I did have one on my 350z. I'll agree,I felt a loss of power on that car as well. I went back to the stock and it felt better. Maybe it was all mental,but you know your car and you can feel when it's not right.
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Old 07-30-2014, 09:38 PM   #3
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its summer. /thread.
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Old 07-30-2014, 09:52 PM   #4
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I don't get near the jump off the line that I did without it and my 0-60 seems slower than ever. Also, the shifting feels mistimed. (It's an auto) so I'm not sure what's going on. On AM the reviews were nothing but positive but these issues have worried me.


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Old 07-30-2014, 10:08 PM   #5
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Even though it says you don't need one a tune would probably help.
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Old 07-30-2014, 10:19 PM   #6
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Thats because u probably don't have a tune do u

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Old 07-30-2014, 10:19 PM   #7
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If the box isn't sealing well where it touches the hood, and where the tube goes through the box, your filter will suck in that nice HOT engine compartment air. This will make you lose power. Hot air=less dense/less power, cold air=denser and more power. The Steeda one is nice because it uses the factory cold air inlet from the grille, as well as doing an excellent job of sealing out air from the engine compartment. Haven't seen a JLT in person so I don't know if its the same.
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Old 07-30-2014, 10:32 PM   #8
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Even though it says it doesn't require a tune, in all honesty it probably does. These cars are maf tuned. The moment you introduce more air, the maf doesn't know what to do. The maf expects to see X and the intake is showing it Y.
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Old 07-31-2014, 07:35 AM   #9
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Quote:
Originally Posted by Colin1337 View Post
Even though it says it doesn't require a tune, in all honesty it probably does. These cars are maf tuned. The moment you introduce more air, the maf doesn't know what to do. The maf expects to see X and the intake is showing it Y.

Thats not how a MAF works. In a nutshell, a MAFs purpose is to calculate the air density coming into the engine. Basically with what you're saying, the car wouldnt be able to tell the difference from idle, part throttle, cold weather, hot weather... thats the point of a MAF, is to be able to adjust to different dynamics.

The only reason an intake would require a tune is if you change its housing diameter from stock, because that is a very crucial calculation in mass airflow. In this case, you are correct, the computer would add fuel thinking the housing size is "x," but it is in fact "y," and (assuming Y>X) you would end up running lean.
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Old 07-31-2014, 09:10 AM   #10
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So would that mean something is wrong with my whole air setup?


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Old 07-31-2014, 09:15 AM   #11
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The only CAI's that IMO improve performance over the stock air box are the Steeda and Airaid ones, since they have rubber strips on top that press against the hood and re-use the stock factory air inlet to actually pull in outside air. The rest are just open air filters that pull air from inside the engine bay and make a cool noise. Quite possible it will negatively affect your cars performance compared to the stock air box.
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Old 07-31-2014, 09:21 AM   #12
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Well that's not cool. It's advertised as adding 10-15 rwhp last I checked. That's a lot I know but I bought it as my first mod so I accepted what it said lol


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Old 07-31-2014, 09:24 AM   #13
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Originally Posted by MustangMafia901 View Post
Well that's not cool. It's advertised as adding 10-15 rwhp last I checked. That's a lot I know but I bought it as my first mod so I accepted what it said lol


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That's with a tune. Without the tune your MAF won't adjust and it won't be sucking in any more air than stock.
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Old 07-31-2014, 10:56 AM   #14
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That's with a tune. Without the tune your MAF won't adjust and it won't be sucking in any more air than stock.

Again, not exactly true (regarding more air being sucked in than stock). If you assume the open element filter has a larger surface area than the stock panel filter, and assume the intake track had some prior obstruction it no longer has, the addition of a CAI WILL bring more air in than stock.

Again, this is NOT a bad thing, its the reason we all add intakes: more power. The only timing more air is an issue is if it is coming in the form of an increased MAF diameter that has not been tuned for.

Here, i found an example of a MAF curve for a mazdaspeed3 (i tune quite a few of these so i had one laying around).

The x Axis is MAF volts ( i believe the mustang uses frequency measured in hrtz, but the principle is the same) and the Y is G/s (grams per second) of airflow / fuel.

Based on a given mass air flow, which can vary depending on gear, load, rpm, flow potential... The MAF will fall at any point along this curve. As you can see, its a logrithmic curve, so it can handle quite a bit of additional airflow beyond stock perameters. Keep in mind, when flooring it through a gear, shifting, flooring it through a gear, shifting... you will fall through the same section (more or less) of the MAF over and over again, with only a slight increase in each gear due to the added load.

Now, when going to a larger intake, this entire curve needs to be scaled to change the math for mass air calculations. Thats basically what the "tune required" portion of the intake is.
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Old 07-31-2014, 11:04 AM   #15
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Again, not exactly true (regarding more air being sucked in than stock). If you assume the open element filter has a larger surface area than the stock panel filter, and assume the intake track had some prior obstruction it no longer has, the addition of a CAI WILL bring more air in than stock.

Again, this is NOT a bad thing, its the reason we all add intakes: more power. The only timing more air is an issue is if it is coming in the form of an increased MAF diameter that has not been tuned for.

Here, i found an example of a MAF curve for a mazdaspeed3 (i tune quite a few of these so i had one laying around).

The x Axis is MAF volts ( i believe the mustang uses frequency measured in hrtz, but the principle is the same) and the Y is G/s (grams per second) of airflow / fuel.

Based on a given mass air flow, which can vary depending on gear, load, rpm, flow potential... The MAF will fall at any point along this curve. As you can see, its a logrithmic curve, so it can handle quite a bit of additional airflow beyond stock perameters. Keep in mind, when flooring it through a gear, shifting, flooring it through a gear, shifting... you will fall through the same section (more or less) of the MAF over and over again, with only a slight increase in each gear due to the added load.

Now, when going to a larger intake, this entire curve needs to be scaled to change the math for mass air calculations. Thats basically what the "tune required" portion of the intake is.
That seems to much like algebra, you lost me.... Lol
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Old 07-31-2014, 11:20 AM   #16
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I think it would technically be area under the curve, so thats calculus.
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Old 07-31-2014, 02:28 PM   #17
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Ok so let's soak English here, I don't understand Greek... lol

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Old 07-31-2014, 02:36 PM   #18
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... As long as the intake you have is no tune required you will be fine.

IF the tune requires an intake it is because the MAF portion is larger. You will likely see bigger gains from a larger intake that requires a tune (because of the higher flow potential), so not all of the gains are coming from the tune alone.

A no tune required intake may or may not provide gains on its own without tuning for it, but they will likely be minimal. Its almost pointless though, since almost any other mods you would compound it with (gears, cat delete, headers...) do require a tune, so you may as well get the larger "tune required" intake. Just be sure not to install it until you have the tune, or you will zoom zoom boom.

Did i about sum it up for you?
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Old 07-31-2014, 02:57 PM   #19
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Okay so would you recommend selling my JLT and investing in one that is a tune required one?


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Old 07-31-2014, 03:00 PM   #20
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its up to you and your ultimate mod goals. If you want every bit of power N/A, sure, a larger intake will get you there. If you've only got an intake and cat delete, and a basic tune, you likely wont see an appreciable difference. just have to decide if the money you lose switching intakes is worth the few extra ponies at your particular power level.
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Old 07-31-2014, 03:47 PM   #21
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Well I'm wanting to make it the baddest sixxer out there so the faster the better. Any suggestions on other intake/tune combos?


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Old 07-31-2014, 03:52 PM   #22
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Well I'm wanting to make it the baddest sixxer out there so the faster the better. Any suggestions on other intake/tune combos?


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Old 07-31-2014, 05:31 PM   #23
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Originally Posted by MustangMafia901 View Post
Well I'm wanting to make it the baddest sixxer out there so the faster the better. Any suggestions on other intake/tune combos?


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If you want it to be the "baddest sixxer" out there maybe you should do something other than a CAI. I think most here will tell you they are not great power adders, more of a sound adder.
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Old 07-31-2014, 05:31 PM   #24
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Haha I don't exactly have deep pockets but I figure I sell the JLT and hold off on the new sound system I was about to get and I could afford a new one


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Old 07-31-2014, 06:09 PM   #25
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If you want it to be the "baddest sixxer" out there maybe you should do something other than a CAI. I think most here will tell you they are not great power adders, more of a sound adder.

Okay, well even though it's not a tune required CAI, will it still work well if I decide to put a tune on? If so I'll just keep it and build around it


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Old 07-31-2014, 08:19 PM   #26
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Sell it. Put your stock air box back on and buy a tune instead. /thread. Cai's are not really worth it.
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