meth injector in intake plenum?

[dsmcurse]

so i curently have the AEM water/meth kit, im using 3" intercooling piping with a 3" GM air sensor in the IC pipe. my 550cc meth nozzel is mounted after the GM sensor but befor my throtle body. my problem is, is that the inside of my 3"GM air flow sensor is getting caked in meth residue.

i dont like the idea of liquid back flowing onto the sensitive lil tiny wires inside of the expensive air flow sensor. im planning on getting the $65 upgrade that gives you a splitter and another nozzel of your choice. im gonna run dual 550cc meth nozzels.

my question is, instead of putting both nozzels in the intercooler pipe before the throtle body how about i put them after the throtle body in the intake plenum.
my IM is a dejon tool sheet metal peice. it would be super easy to tap. i could put them evenly spaced in the plenum so the cyclinders all receive the same amount of spray.

are there any draw backs to this idea? is the meth residue caking up in my GM sensor bad? are there any other members out there squirting water/meth straight into the intake plenum? thanks for any advice

 

[BigBeans]

It's probably not "meth residue" on the MAF. Meth/water doesn't really leave residue.

If you had meth backflowing onto the MAF, you'd have studder/breakup issues after each pull because when liquid hits the MAF it will read it as an airflow spike and the car will go pig rich.

As far as putting it in the Mani, that's not a good idea at all. First, you're likely to have distribution issues, and second, with very little time between the injection and combustion, the water/meth has very little time to cool the charge.

Some of the meth actually vaporizes in the tubing, bringing the air temp down. If you spray it into the plenum, you'll lose some of that effect.

 

[ckrell]

alcoholinjectionsystem.com is a place ive been checking out, there pump is adj. from 100-250psi. they also have indivdual runner setup

 

[dsmcurse]

thanks for the response and that does make sense. my water/meth is a wal-mart mix. i use peak brand windsheild wipper fliud (blue kind thats 99cents/gallon) with 3-4 little bottles of HEAT. depending on how spicy i mix it. my gm air sensor has blue residue lil chunky particles. its from the wiper fluid meth mix. i was worried about the sensor getting damaged. the car actually was running a lil lean last time i had it going. thats why im switching from 780 fuel injectors to 1000cc's and a extra meth nozzel. but DO INDEED keep my meth nozzels in the IC pipe? wish a could get my airflow sensor further down my piping but the fact that i use dual greddy blow off valves im limited on space...

 

[BigBeans]

thanks for the response and that does make sense. my water/meth is a wal-mart mix. i use peak brand windsheild wipper fliud (blue kind thats 99cents/gallon) with 3-4 little bottles of HEAT. depending on how spicy i mix it. my gm air sensor has blue residue lil chunky particles. its from the wiper fluid meth mix. i was worried about the sensor getting damaged. the car actually was running a lil lean last time i had it going. thats why im switching from 780 fuel injectors to 1000cc's and a extra meth nozzel. but DO INDEED keep my meth nozzels in the IC pipe? wish a could get my airflow sensor further down my piping but the fact that i use dual greddy blow off valves im limited on space...

I can't imagine that the residue/backflow is allowing your car to meter fuel properly. GM hotwire MAFs are very sensitive, and liquid or residue on the wires will throw off the reading A LOT.

What are you tuning this car with? Do you actually need larger injectors, or is that your solution to the car running lean?

Also, there's 4' of pipe between the FMIC and the TB, so i don't see how you're running out of room. You might have to redesign the charge tubes (i need to do the same thing actually) but there's definitely room.

 

[dsmcurse]

i use dsm link V3 to tune. its a built motor with slightly higher compression pistons and a nicer head with 272 cams both intake and exhaust. 3" intercooler piping from turbo to TB. short route as all hell. 3" turbo back exhaust. ebay turbo header but has a real live HOLSET HX-40 from bullsey power. my 780 injectors log 95%idc at 28psi of boost. i use 92 octane pump gas and a spicy mix of water/meth. i have wide band and it has logged lean. fuel pressure isnt a problem thanks to a 310 liter per hour fuel pump. my goal is 400 awhp at a nicley tuned 30psi pump gas.

my opinion, its gonna take 1000cc injectors and another 550cc meth nozzel for a combined totall of 1100cc meth to have a safe "high boost pump gas tune" my current 780cc and single 550cc set up is fine for about 26-27 psi but not any more. i want to dip into the 30 psi-ish zone

what can i do to prevent the meth/water to back flow into my gm maf?

 

[BigBeans]

what can i do to prevent the meth/water to back flow into my gm maf?

Solid setup, 780s won't meet your needs, thats for sure. 400+whp on a safe pump gas tune is a good time

What are you seeing for airflow from that HX-40?

As far as the meth setup, if you don't have a solenoid, you can add one to the system and it will help a bit, but it's not a cure. I'm running straight pump gas right now because i'm having the same issue with meth hitting the MAF. Realistically, with large nozzles, you need the maf to be at the same height, or slightly above the nozzles. I have twin M7s (440cc each @ 100psi, but i'm at 150psi or so) with a solenoid, and the meth runs down the tubes into the MAF after each pull, so i had to tune on 93 alone. When i fab new charge tubes, the maf will be slighly uphill from the nozzles.

 

[3kgt2nv]

one thing to also be careful of is if your piping is slanted that the meth can collect in the intercooler and cause all kinds of issues as it is reducing the effectiveness of the ic and also can make super rich conditions.

my 3000gt got a stuck open nozel and i ended up pouring about a gallon of 50/50 meth out of my fmic at the track. i started off good but after 3 or 4 runs i was getting all kinds of issues and breaking up after about 3 grand rpms.

i put in a control solenoid from devils meth and no more issues.

also if the tank is mounted higher than the nozzle it can leak also

 

[dsm-onster]

If you have build up like, your check valve isn't closing fast enough if that is all you're using (they never do). Or your solenoid isn't functioning properly. You should have no flow back to the maf like that unless you're already off throttle.

Do not use only 2 injectors in the plenum. It wond spread the meth/water mist enough. Yo need 4 directed to each port when you are that close to the runners.

 

[dsmcurse]

wish i could figure out how to post a picture right here to explain what im talking about...

so if i get four 300cc meth nozzels and tapped each individual runner on my intake manni i could saftley do this and its gonna make more power but still wont ever let the water/meth back flow down my piping and get the 3"GM maf wet.