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post #1 of 20 Old 04-10-2013, 03:34 PM Thread Starter
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SMEC air flow, how important ?

Beem looking at pictures of cold air intake systems here on TD. And notice most are not setup to draw air past the electronics of the SMEC..So how important is it to have air flow throught the computer ???????
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post #2 of 20 Old 04-10-2013, 04:00 PM
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Re: SMEC air flow, how important ?

Some will say not important, some will.

Personally I say it is important, it will improve the life of your electronics. There are heat sinks in there for the voltage regulator and other junk and when they stay hot during operation they don't last as long, rule of thumb for any electronics

I run a K&N cone filter on my 2.5T, because the car came with it, so I installed a computer fan onto the intake side of the SMEC case and have it run with key-on. It does pull hot air from the SMEC when you have your hand on the fan exaust.

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post #3 of 20 Old 04-10-2013, 04:03 PM
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Re: SMEC air flow, how important ?

I've been known to put a plastic bag over each end with a rubber band to keep the water out, when I have them socketted. Works fine. Air flow, not important.
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post #4 of 20 Old 04-10-2013, 05:19 PM
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Re: SMEC air flow, how important ?

Check to see if their is a RAM air scoop that picks up air as you drive. Forcing the outside are to pass over the SMEC. Mine is located just to the right of the rad. overflow tank. Mine you can see with a flash light.

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post #5 of 20 Old 04-10-2013, 08:01 PM
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Re: SMEC air flow, how important ?

Quote:
Originally Posted by Una View Post
Air flow, not important.
I disagree, the "power module" portion of the SMEC needs cooling... power transistors need cooling, without it - it reduces the lifespan of the components.

That being said it's like someone that chain smokes thier whole life, some die at age 35, others make it 100 and laugh at the doctors!

For covering over/waterproofing the socket I use a big vinyl sticker (hard to explain), but not everybody has that available to them
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post #6 of 20 Old 04-11-2013, 04:44 PM
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Re: SMEC air flow, how important ?

Shawn, Did you have a chance to check on the RAM scoop by your battery? Is you ECU located on the drivers side finder?

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post #7 of 20 Old 04-11-2013, 06:39 PM
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Re: SMEC air flow, how important ?

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Originally Posted by yellonoma View Post
I disagree, the "power module" portion of the SMEC needs cooling... power transistors need cooling, without it - it reduces the lifespan of the components.
And what do you base this "fact" that it shortens the lifespan on? Got the datasheet for the transistors used in the SMEC? How about a graph showing the temperatures reached during operation without airflow?
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post #8 of 20 Old 04-11-2013, 07:15 PM
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Re: SMEC air flow, how important ?

Havent had the factory intake set up to pull air through the computer since 2005......doesnt mean it wont break tomorrow...but it hasnt yet..
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post #9 of 20 Old 04-11-2013, 07:40 PM
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Re: SMEC air flow, how important ?

I take the outside cover off of mine and have never had any probs. On the other hand I have allot less clutter in my bay than most so I know there's allot of air movement. just my $.02
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post #10 of 20 Old 04-11-2013, 09:02 PM Thread Starter
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Re: SMEC air flow, how important ?

Quote:
Originally Posted by CBMDennis View Post
Shawn, Did you have a chance to check on the RAM scoop by your battery? Is you ECU located on the drivers side finder?

Dennis
yes the ECU is on the drivers side inner fender. and there is a scoop. I was only asking my question...in case I wanted to remove my air cleaner box, and use a cold air/ cone type system..with that said/ I do think that the air flow is important/ if it wasn't Chrysler would not have used it.
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post #11 of 20 Old 04-11-2013, 10:40 PM
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Re: SMEC air flow, how important ?

I think as long as you do what yellonoma did you should be fine. Rig up a computer fan to suck hot air out of the neck where the filter box tube connected to it. Make sure its a high CFM fan, and use tape to seal it to the hole. Wire it into the accessory power and boom, cool ECU.
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post #12 of 20 Old 04-12-2013, 06:29 AM
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Re: SMEC air flow, how important ?

FWIW, the factory truck ECU's did not have ducting at all. Juts some louvers to alow air to enter/leave the SMEC/SBEC. The later versions of those had twice as many injector drivers as a SMEC, and they seem to live just fine...
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post #13 of 20 Old 04-12-2013, 07:15 AM
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Re: SMEC air flow, how important ?

Quote:
Originally Posted by Una View Post
And what do you base this "fact" that it shortens the lifespan on? Got the datasheet for the transistors used in the SMEC? How about a graph showing the temperatures reached during operation without airflow?
Rule of thumb of the trade, I work in Electronic Engineering, 7 years experiance. BUT, I never say I am not wrong. It's a better safe than sorry scenario on my judgement. The Chryco engineers that made alot more money than I do also designed the SMEC to have air pulled through the SMEC for a reason.

However I think most people that get rid of the factory air cleaner assembly leave the SMEC open on both ends, so it gets some cooling from air finding it's way through the front end.

I ran without any air cooling to the SMEC for a summer and I had it crap out on me, because of overheating leading to failed components? I can't say for certain. But I wasn't going to risk it again!

If there wasn't so much gross potting compound, I could get read the part numbers on components, and get hold of a datasheet for the components, yes.

This was my solution to the question and doubt. Turbo I throttle body/intake piece, bolt holes fit a standard computer fan and I just wired it into the radiator fan relay and to ground. I turned the fan upside down, looks nicer.


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Last edited by yellonoma; 04-12-2013 at 12:52 PM.
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post #14 of 20 Old 04-12-2013, 08:13 AM
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Re: SMEC air flow, how important ?

Glad this came up. Just installed breather yesterday and was wondering what to do.
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post #15 of 20 Old 04-13-2013, 05:07 PM
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Re: SMEC air flow, how important ?

Jonathan, would you clarify where you get the part to mount the fan to the ECU?
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