"boot-In" MAFS? - Team Camaro Tech
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post #1 of 17 (permalink) Old May 8th, 13, 10:17 AM Thread Starter
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Question "boot-In" MAFS?

I'm trying to order the correct cold air intake for the LS. Can someone explain 'boot-in' MAFS as opposed to blade style?
The MAFS I have has a rubber extension on one side, maybe both. I assume I fit the MAFS in-line with the intake tube. What does a blade style MAFS look like?

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post #2 of 17 (permalink) Old May 8th, 13, 10:46 AM
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Re: "boot-In" MAFS?

The "boot-in" MAFS is the one I have on my car- it's a round tube with screening in it, and a protrusion on one side that the connector plugs into. With the boot-in cold air intake, you slip a rubber boot over each side of the MAFS tube and slide a hard section of pipe into the other side of the boot, and clamp them down.

The "blade" MAFS doesn't have the round tube shape- it's a "blade" that sticks into a hole in a section of the cold air intake tube.

Got a pic of your MAFS? I'm pretty sure your car used a boot-in, but it wouldn't hurt to see a pic.
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post #3 of 17 (permalink) Old May 8th, 13, 10:53 AM Thread Starter
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Re: "boot-In" MAFS?

No, you described it correctly. I just wasn't sure what the blade-style meant. Now it's clear.
Good thing I ordered the boot-in style intake because that's what an LS2 intake is. I figured boot meant a rubber boot that slides over the tube.

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post #4 of 17 (permalink) Old May 8th, 13, 10:53 AM
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Re: "boot-In" MAFS?

Yep. Further confusing the issue is that you can boot in a blade MAFS. Ha. They make adapters so you can plug it in.

This is a blade in sensor in a piece of tubing. See the two little screws holding it in? Those come out and the MAFS slides out. Yours should look like a few little posts with the elements on them.





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post #5 of 17 (permalink) Old May 8th, 13, 10:55 AM
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Thumbs up Re: "boot-In" MAFS?

Most of the LS engines use(d) a boot mounted MAF, the LS7 and a couple other performance models are the exceptions.
As stated, the main difference is installation detail.
Fabricators often go to a blade type and fab a mount in the inlet tube(s) very close the TB.
I think it's Spectre that made a boot/blade system that can mount at TB I saw at Summit a while back. It allowed the installer to use a boot mount an place the blade unit in system as they needed.

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post #6 of 17 (permalink) Old May 8th, 13, 11:30 AM Thread Starter
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Re: "boot-In" MAFS?

Right... Spectre has all kinds of adaptations and configurations.
Mine's the boot-in style which is fine with me... just gotta decide where in the tube I wanna put it.

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post #7 of 17 (permalink) Old May 8th, 13, 12:11 PM
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Re: "boot-In" MAFS?

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Originally Posted by HwyStarJoe View Post
Right... Spectre has all kinds of adaptations and configurations.
Mine's the boot-in style which is fine with me... just gotta decide where in the tube I wanna put it.
The Spectre setup pretty much dictates where it goes. There's a rubber boot at the throttle body, then a 90 degree elbow, then the MAFS mounts between the 90 and a flexible elbow. That's followed by a 12" long tube that you cut to length to get the filter where you want in once the tube passes through the heat shield plate. You could possibly move it further down stream by installing a short piece of tube off the 90, but the kit doesn't have enough boots/clamps for the extra joints you'd create, and you'd also have to extend the wires to the connector to match that location (hell, you don't even want to unplug any connectors on your engine, yet alone extend any wires.....lol).

Here's a pic of my Spectre setup. The MAFS in that pic isn't the right one- it was one for an LS1 that I used to mock up the tube. The "right" MAFS for my engine has a different plug shape, so the black piece isn't so close to the idler pulley under the alternator, but the MAFS is still in the same location in the tube.

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post #8 of 17 (permalink) Old May 8th, 13, 12:34 PM Thread Starter
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Re: "boot-In" MAFS?

You sure got a lotta random wires hangin' all over the place. Need me to help ya sort that out?

Hell brother... I got no problem modifying harnesses... I'll put the MAFS in the trunk if I gotta!!

From what I've learned from those 'internets', closer to the intake is where it should be. Some say halfway between, some say 6" from the TB. I'll just throw it at the car and see where it lands.

(who's the wino in the family?)

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post #9 of 17 (permalink) Old May 8th, 13, 12:38 PM
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Wink Re: "boot-In" MAFS?

The newest Spectre offering allows mounting right before TB as I stated.
It was maybe 2" in front of TB on his installation.

I believe 'CarlC' on here runs this set up on his LS also.

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post #10 of 17 (permalink) Old May 8th, 13, 01:16 PM Thread Starter
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Re: "boot-In" MAFS?

Right in front of the TB will put the elbow into the fan on the radiator. My rad. is the same size (with shroud) as Bobs so it's gonna be close.

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post #11 of 17 (permalink) Old May 8th, 13, 01:18 PM
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Wink Re: "boot-In" MAFS?

Quote:
Originally Posted by Vintage 68 View Post
... I believe 'CarlC' on here runs this set up on his LS also.
Strike that ... IIRC he went with a big Lingenfelter unit on his new engine. ...

The one I saw was on a 2nd gen, but no reason it wouldn't fit or work on a 1st.

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post #12 of 17 (permalink) Old May 8th, 13, 01:42 PM
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Wink Re: "boot-In" MAFS?

Quote:
Originally Posted by HwyStarJoe View Post
Right in front of the TB will put the elbow into the fan on the radiator. My rad. is the same size (with shroud) as Bobs so it's gonna be close.
The Blade sensor mounts directly into the tube Joe, so there's no additional spacer/mount/sleeve(s) needed, or taking up room ...

Do a search for Spectre #900235K (pass side air routing) and take a look.
The elbow bend radius is as shallow as any other on market AFAIK.

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post #13 of 17 (permalink) Old May 8th, 13, 01:56 PM Thread Starter
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Re: "boot-In" MAFS?

I 'm not replacing the MAFS just for that.
I was going with the 900239.

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post #14 of 17 (permalink) Old May 8th, 13, 06:13 PM
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Re: "boot-In" MAFS?

I was always told you want the MAFS as far away from the TB as possible to get colder air running through it, but i could be wrong.
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post #15 of 17 (permalink) Old May 8th, 13, 07:24 PM Thread Starter
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Re: "boot-In" MAFS?

I'll read up on the main purpose of a Mass AirFlow Sensor and make a decision.

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