MAF location, 3900

[dre256]

Need some tech help. On the 3900 V6 on the G6 GTP the MAF sensor is in such an odd spot. Its prone to heat soak where its located at on the far side of the engine away from the throttle body just past the heat soaking exhaust manifold. I have a cold air box on my G6. What I am thinking of doing is cutting the MAF wires then soldier extendtion wires on and move the MAF into the cold air box. Since the IAT is built into the MAF sensor this should help give a more acuarte tempurture reading. As on a 75 degree day my dash hawk says the IAT is like 100.

Heres my question before I start, since the MAF sensor is so far away from the TB, moving it another 9-12 inches farther away is that going to cause acuracy issues with it mesuring the air flow? From I understand the MAF is best 6-12" from the TB. But if I did that on the G6 the MAF will always be heat soaked. As in its stock fourm its like 3 feet of air travel to to the TB. So making the air go 4 feet foing to cause an issue? To make the MAF sensor fit into the box, I will get an angled piece and put the air filter below the head light inside of the bumper and pull even colder air in then just from the engine bay.

Heres a pic of my engine bay and can see how far away from the TB the MAF sensor is and the cold air box I want to relocate the MAF senor into.

[pocket-rocket]

If anything, if it were my car I would move it closer to the TB. That way the PCM gets more accurate information as to the amount of air, and the temperature of the air is actually going into the engine. The air is flowing fast enough across the sensor elements that I doubt any heat soak takes place on the actual elements themselves. If you are worried about heat soak on the intake tract, wrap it in some heat rejecting material.

[dre256]

The heat soak that its getting isnt while the car is running. Its when I go to the store a few miles away, then get back into the car and the engine heat has soaked the MAF sensor to say its 100-110+ on say a 70 degree day. Then it takes forever to cool back down.

I guess the better question is then, will moving it then closer to the TB with a more acurate air reading be more benifecial then the heat soak its going to get in park after running?

[pocket-rocket]

Being more accurate will always help, heat soak will not.

You could try applying some foil tape to the bottom of the MAF housing before moving it to see if that helps it reject heat soak any before going through any trouble of modifying anything. 30 degree difference, that is pretty nasty. I'm curious as to how much heat soak the CAI box is getting as well. A G6 isn't a big car, then they stuff a large 3.9l v6 in it. That bay doesn't look very big, kinda reminds me of the LQ1 in a w body, lol.

[dre256]

That is an idea rap the bottom and see how that goes. I will try it and if it works that will be maybe the idea I will go with trying to put it closer to the TB. All the G6s have the issue and complain the same thing. This company vector made a IAT relocate kit for the G6 but it didnt work right, messed up MAF numbers and caused all types of issues.

But yea that 30 degrees is alot and once my dash hawk says the IAT is 100+ the 3900 seems like it has as much power as a 3500. You did bring up a good point, I dont know how much heat soak is happening in the box while the car is sitting. There maybe no advantage putting the MAF in there. I cant disagree, there is no room under the hood at all, its all engine lol. Only thing worse then the 3900 under there is the DOHC 3.6Ls

Thanks for some idea on the MAF for me to look into!

[boomofdoom88]

The amount air going through the pipe at the MAF and what ends up at the Throttle body doesnt' change. Its a MASS air flow sensor. It measures the mass of the air going in. The mass wont change. But it has a 5 wire MAF so it has a builtin IAT sensor. I would agree having the IAT closer to the engine would be better tho. But if you move the IAT your only going to skew the tables in the pcm and it will just add spark timing and you might get some KR which will just bring your timing right back down.


Its too early in the morning, I just realized I'm replying to a thread 7 months old lol. Oh well

[robertisaar]

since it's been bumped.....

the heat soak? it's probably not skewing accurate MAF/IAT data at all, the heat in the engine comparment is probably just that high. there's not a lot of room for heat to dissipate to.

if you do relocate the MAF, notice the "accordion" looking rubber tubing that's supposed to be on either end of the MAF? make sure to keep that consistent, from what i'm told, it's done to prevent the airflow from resonating or something similar, which will give false MAF readings.