Water Injection with GM MAS

[mullet]

Yes, yet another water injection question, but I can't find the answer so here it is:

Anyone running water injection before their GM Mas (blow through setup of course)? Any ill effects?

My mas is connected to my throttle body elbow so not much to play with post GM Mas (or is good enough for atomization if it's tapped into the throttle body elbow?).

 

[kicker91laser]

This question was brought up at the colt/mirage forum (4g61t.org), and it was said that it would not work. I'll try to get a link to it. I have seen many with the injection nozzle in the throttle body elbow.

 

[mullet]

Coolingmist Responds: Hi, I have never heard anyone having any problem with the MAS sensor. We have sold many to DSMs and alot have put prior to the MAS. hope that helps.

 

[psychlow]

If it were me, I'd be highly concerned about it not damaging the sensor, but affecting the airflow readings when used.

The GM MAF measures airflow by letting the air cool a wire. It's meant to be used when dry. If you spray water directly onto it, it can make the sensor think that more air is being delivered than there actually is. As the water evaporates from the wire, it takes heat with it, cooling the wire more than usual.

I don't know how much of a difference it could make, however. I plan on running water injection myself, and I'll have it tapped at the T/B elbow. In fact, I think this is the BEST place to put it - if you put it in the bend, you can lessen the entrance angle which will spray more of the water down into the pipe rather than onto the side.

 

[mullet]

If it were me, I'd be highly concerned about it not damaging the sensor, but affecting the airflow readings when used.

The GM MAF measures airflow by letting the air cool a wire.

I plan on running water injection myself, and I'll have it tapped at the T/B elbow.

I just wanted to know if anyone is actually running water injection before the maf. Yes I know the principles of how a hot wire works. I figured I could compensate with the translator or the safc2 regarding fuel delivery.

Surely this must happen when the humidity is at 98% naturally.

Do you think injecting the water in the TB Elbow will give it enough time to atomize?

 

[psychlow]

Do you think injecting the water in the TB Elbow will give it enough time to atomize?

Atomization is going to be a product of your nozzle, the amount of boost, and your cylinder head design moreso than anything else. I doubt that adding extra length that the water has to run through before reaching the intake will have any measureable effect on atomization.

 

[AL92]

I bought a dual stage coolingmist system one goes before intercooler and one usually in tb elbow.I would think for sure that the one before intercooler would be far enough away from the blow thru to not have an affect.Obviously even in draw thru config water vapor is drawn into the intake track on rainy days.I would trust what coolingmist says he seems to know his stuff.I changed cars recently and don't have my water injection system installed yet.
It appears I need an new engine first

 

[bastarddsm]

I just wanted to know if anyone is actually running water injection before the maf. Yes I know the principles of how a hot wire works. I figured I could compensate with the translator or the safc2 regarding fuel delivery.

Surely this must happen when the humidity is at 98% naturally.

Do you think injecting the water in the TB Elbow will give it enough time to atomize?

yes it is similar, but in our application the water in the air would be at the same temperature as the air in the intake, becuase the humidity wnet through the turbo and all that with the air. where as the water from the injection is really cold and will really richen things up.

 

[TURFNNSURF]

Just to let everyone know, last October '04 I converted to a GM mas in a blow-thru setup. I also took the time to create a true CAI since I had replaced the stock side mount IC with a FMIC. Here is a pic of the old setup.

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Shortly after this install I had to drive about an hour in a light rain/drizzle and the water that sprayed up from the road was enough to get sucked into the CAI. Pass through the turbo, through the 24"x8"x3" FMIC and make it to the GM MAS. This wet the GM mas honeycombs and heated wires enough to cause bogging at any boost. I had to limp the car home not boosting at all, pull the UICP and blow-dry the GM mas and wipe the pipes dry. It still took another 3-4 days of daily driving to completely dry out the water collected in the bottom of the FMIC.

Since then I relocated the K&N filter to the stock filter location, No more CAI. All was well with this setup until tonight. On my way to the shore this afternoon it was raining, another light drizzle, and the road spray from following cars was enough to make in into my engine compartment through the stock SMIC hole. My GM mas had gotten wet again, this surprised me since I have driven in rain heavier than this since last Oct without any problems..

Moral of this story, if you get water injection, install it after the GM mas and before the throttle body. I personally, have just ordered the deluxe single stage kit from cooling mist and will install the nozzle in my throttle body elbow.

 

[AL92]

This is interested info.I got a dual stage which sprays before intercooler and then into tb but maybe won't use the pre intercooler stage .I would think maybe with a light enough spray it would not be a big deal.

I also would think some water would get thru even with a draw thru like ran on my 92 with zero problems after all the maf is right behind the filter in stock location.Anyway sounds like putting the filter under the fender may not be the best idea with gm maf period.

 

[TURFNNSURF]

AL, I was as very surprised and dissapointed at the same time to find out that enough moisture got through the intake to wet the MAS. Today, I am making a splash guard for my intake that I can drop in when rain is forcast. Really, now that I think about it, I have the FMIC I shouldn't worry that much about having the coldest air charge at the intake anymore..

 

[psychlow]

Good information, Brad.

 

[kicker91laser]

Good information, Brad.

Yes, I second that. I think that shows it will not be possible to inject before the maf.