MAF in the up-pipe...Where do I mount the nozzle?

[Sleeper]

I need some help with some options. I'm trying to plan my alky setup, and because I'm running an LT1 MAF in my up pipe, I really can't mount my alky nozzle in the up-pipe. (Don't want to spray the MAF) Is there an optimum place in the plenum to mount it, for proper atomization and distribution? (I'm also running a Power Plate)
I also thought of running it in the short hose that goes between the MAF and TB, but I'm concerned about poor distribution by it being too close to the throttle blade.

Thanks,
Paul

[Razor]

Anywhere before the throttle body and you'll be fine. Put it after the MAF and before the TB.

HTH

[bruce]

Originally posted by Sleeper
I need some help with some options. I'm trying to plan my alky setup, and because I'm running an LT1 MAF in my up pipe, I really can't mount my alky nozzle in the up-pipe. (Don't want to spray the MAF) Is there an optimum place in the plenum to mount it, for proper atomization and distribution? (I'm also running a Power Plate)
I also thought of running it in the short hose that goes between the MAF and TB, but I'm concerned about poor distribution by it being too close to the throttle blade.

Might try one of the AL vac blocks, and then drill/tap a hole for it, post butterfly, kinda like an ATR 7th injector set-up if you know what that looks like.

[Mr. T]

Paul,
I'd caution putting the nozzle post-MAF/pre-blade. The reason I say this is once the throttle slams shut at high boost levels and the compressor surge/pressure builds up at the throttle blade you may find that any subsequent alky spraying will get knocked around and end up on the MAFs metering element. Causing MAF hydro-lock.

I am with bruce. Get it on the other side of the blades. Run two smaller fine mist jets. I'd spray from the top down as bruce suggested. However, I would suggest pointing the jets toward the front of the plenum as the flow of boosted air may push the alky to the rear of the cylinders due to the location of the jets. Or you could just drill and tap right behind the throttle blades, spraying straight down and let the air carry the alky where it needs to go.

If you need an extra plenum talk to richie6 he had one that I was going to take for ~$35. I may still have the name of someone with stock TB as well. God I love our GTA community.

Hope I am not talking out of my ass this morning. :???:

[Sleeper]

Thanks for the replies guys.

Julio, I have some concerns about putting it that close to the TB, as Mike stated. (If you look at Bruce's pics http://www.gnttype.org/techarea/engine/mafrelocate.html you can see that there isn't much room between the MAF and TB)

Bruce, I know what you mean about going 7th injector style, but I have a problem with hood clearance... it just touches the top of the vac block

Mike, you're kinda making sense this morning

It's looking more like drilling the plenum behind the TB. I'm wondering if 2 nozzles on either side would aid in the spray pattern distribution??? If so... need to figure out the placement, and angles...One on the high side, and one on the low side of the blade, pointed ? Both parallel to the blade shaft, pointed?

Keep the ideas coming guys.

Paul

[JayC]

I have a half inch aluminum plenum spacer with a spray bar through it. That would work well if you can deal with the hood clearance.

[Mr. T]

Originally posted by Sleeper
Mike, you're kinda making sense this morning

Well, now it is the afternoon... let's see how off I am after 12pm on 5 hours sleep.

I'd suggest moving the jets to the front of the plenum, behind the TB mounting flange, horizontally (or a minute angle). Drilling and tapping there would ease your hood clearance issues. Running prebent hard line and using couplers would make for a nice package. You should be able to clear the throttle linkage on that side, and there is nothing on the pass. side to negotiate. This will keep the initial spray as close to the TB as possible and should allow for reasonable distribution of the injected medium.

Or you could do it mechanical fuel injection style and drop an injector/jet generally over each of the intake ports and let alky drop where it may. It'd look prety wild with a sea of lines crowning your engine around the top of the dog house.

I was going to run Jay's 7th on my car before I decided to sell it. It is a nice piece... but you'd need a cowl to use it, or get your up-pipe to pop off a few more times to make the room.

[JayC]

You could also move the MAF back into the inlet track a bit and put the nozzle in the usual location.

[Sleeper]

Thanks Jay, but I doubt that I have the hood clearance for the spray bar spacer (I will check though, and see if I can do any hood brace massaging) Just curious... would your spray bar interfere with the Power Plate flow distribution?

I guess if worse comes to worse, I can move the MAF back to the stock location, and just put the nozzle in the up pipe

Mike, don't want to get too complicated with the port injection setup. Still trying to figure out if the distribution would be better using 2 nozzles.
LOL on the blowing off the up pipe to make room for the 7th. It put a nasty dent in the hood the first time. Not a problem since I put on the HD hose clamps.

Paul

[JayC]

It should be fine if you put it underneath the power plate.

As far as the MAF, you could move it to the other end of the intercooler pipe.

[Mr. T]

Originally posted by JayC
It should be fine if you put it underneath the power plate.

As far as the MAF, you could move it to the other end of the intercooler pipe.

1) Theoretically, no you can't. That would compromise the whole design of the PP, which was designed for stock unported/modifed parts. raising the plate 1/2" would throw things off a bit.
I was going to mill the bottom of the dog house off, and add the PP & your 7th as the new base.

2) That is a good suggestion that I forgot to make. Just move the MAF closer to the I/C, Paul. And then stick the alky in the up pipe.

[Razor]

Any nozzle mounted in a vacuum area must use a selenoid to prevent siphoning to occur. Sounds like a lot of work when the usual location has proved to be so efficient. Not that I dont like new ideas, I guess only way is you'll have to play.

MAF hydrolock..good term..dunno..havent experimented with this idea yet.

If you need a selenoid, let me know..

Julio

[1badTTA]

Originally posted by Razor
If you need a selenoid, let me know..

Julio

Julio, I did a search for "selenoids" and couldn't find any, where do you get them.

BTW I did find a ton of "solenoids".

I would have to agree that the best solution would be to move the MAF to the other end of the uppipe.

[Razor]

Ahh the elusive selenoid not to be confused with a solenoid thats easy obtainable.

I have to improve my grammmmar

trouble maker

[1badTTA]

LMAO

If you haven't noticed, I only pick on you.

I won't go into the use of "too".

[Sleeper]

Originally posted by Razor
Any nozzle mounted in a vacuum area must use a selenoid to prevent siphoning to occur. Sounds like a lot of work when the usual location has proved to be so efficient. Not that I dont like new ideas, I guess only way is you'll have to play.

MAF hydrolock..good term..dunno..havent experimented with this idea yet.

If you need a selenoid, let me know..

Julio

Help me understand this... under part throttle, isn't the up-pipe considered a vacuum area?

If I put the MAF at the other end of the up pipe near the intercooler wouldn't the "drips" from the nozzle mess it up?

Paul

[Razor]

Zero issue with siphoning when nozzle is mounted above the feed tank. Below the tank, I have read there can be issues. Worst case, install a selenoid. Also part throttle wont apply 20 inches vacuum, plus the turbo is pushing air. Hence why I say its a non issue.

Dunno bout the drip issue. Usually air is flowing past the nozzle, so I can see the possibility only after racing the car and slamming the throttle blade closed. I have never tested the effects of hitting a MAF meter with some alky.

Another solution is eliminate the MAF and go to a Felpro