So did the MAFT + rain=horribly rich tune problem ever get solved?

[RMeadows]

Getting pretty sick of not being able to boost if the ground is wet

 

[blownturbotsi]

I never have issues, what kind of problems are you having?

 

[Killa_dsm]

Me neither, I never had a issue like that.

 

[blownturbotsi]

I already have a pretty rich tune as well, I just wanted to add. I think I'm around high 10's WOT in 3rd gear.

 

[RMeadows]

You all running in blow-thru? It's a very common problem with that type of setup. Supposedly the sensor gets wet and causes the car to run very rich? That's what i've read anyway. If you search you'll see this same subject has come up hundreds of times over the years. My car runs so rich when it rains that I can't even get into boost. The car just sort of bogs as soon as it hits boost and doesn't go anywhere.

 

[crimsondragon]

It's not the MAF getting wet. The humidity in the air throws the temperature reading off the MAF. The water saturated air cools the sensor in the MAF making it believe the air is actually denser than it is and thus dumps more fuel to compensate for what it's reading. I'm curious though...if this happens to our cars, then does that mean it happens to all GM vehicles which run the GM MAF? It seems impossible that GM owners would complain about driving in the rain...
Alas, this is the one reason keeping me from switching to a blow thru setup. Tristate area rains about once every week average.

 

[blownturbotsi]

Yes, mine is set up as blow thru. There's been quite a bit of rain as of late, but I haven't had any issues. I would like to take my car down to Palm Beach when I visit my family next year, maybe I'll see more of what you're talking about then. :dunno:

 

[Killa_dsm]

Blow thru set up here as well. I even run meth injection after the maf which I would imagine would be effected when letting off the throttle since my bov is before the maf. But nothing happens.

The only time I actually had a problem with running really rich was when I power washed my engine bay. I don't know how but the maf got wet and the car wouldn't run, and would puff out black smoke. Took it apart and that fixed the problem. Probably has nothing to do with the problem your having but just thought I would share.

And yes, I have heard about people having problems with change in humidity. But I'm not sure ther is a fix for that.

 

[RMeadows]

It's not the MAF getting wet. The humidity in the air throws the temperature reading off the MAF. The water saturated air cools the sensor in the MAF making it believe the air is actually denser than it is and thus dumps more fuel to compensate for what it's reading. I'm curious though...if this happens to our cars, then does that mean it happens to all GM vehicles which run the GM MAF? It seems impossible that GM owners would complain about driving in the rain...
Alas, this is the one reason keeping me from switching to a blow thru setup. Tristate area rains about once every week average.

I had one on my Camaro, never a problem. Of course, our fuel pressure doesn't increase with boost so i'm sure the effects are much less profound. Also the fact that the humidity is clamped thru the MAFT because it isn't 100% compatible with our cars makes a big difference. It has no way to adjust to the change basically.

My question is this. I know people with the same setup, and they don't have a problem. So there has to be something more to it. One car with MAFT in blow-thru runs fine in the pouring rain, the other is crippled. We have to be missing something here...

 

[crimsondragon]

Well for one thing, the general weather could be an issue. Blownturbotsi lives in New Mexico while killa_dsm lives in the Bay area. I don't know how humid Lakeport is but I'm pretty sure New Mexico is dry. Having lived in Florida for a year, it's safe to say it's humid all year round. Also different setups might have to contribute to it. CAI will let more water in during rain. Long route and short route piping also might have an effect on how far water travels up as well as the design of the intercooler.