I'm designing the basic lay out of my system atm so it will work like :

Fuel cell---surge tank----filter----pump ( then going under car ) up into engine bay to various bits and bobs.

all control gear will be in the glove box.

I will have 2 differant setups.

1. methanol
2. water

since i am to tune with both for factual reasons i want to debate nozzle loaction and sizing on the open forum.

idea 1 for water and methanol
nozzle location in elbow with 2 nozzels spraying from narrow part to wide part. one nozzle located at butterflys and one a touch back.
changing from 2x 1.0mm jets to 2x x.xmm jets for water

idea 2. putting 2 nozzels in plenim at either side. one in each secondary runner.

idea 3. various size nozzels placed along the inlet tract to achieve differant things.

Ideas anybody ???

Scott

 

scott,

i remember you posted a pic of your TB and it had v uneven dispersion markings. might that have been partially because your system wasn't making enough pressure?

i do think the question as to optimum FD jet location has yet to be settled. probably because there have been a small number of serious AI installs.

i am going to stay w my current locations as 07 starts in wisconsin. my TB looks clean on 100% methanol. further, my digital egt readings are within 30 degrees F front to rear rotor. it was really easy to tap into the silicone coupler immediately in front of the elbow. i am at 6 and 3 oclock to bias against the elbow turn and favor the secondaries.

one thing i wonder about is whether it is better to inject nearer the combustion chamber. i think there are genuine plusses and minuses and it may just take someone doing both in a scientific manner on the FD to answer the question.

good luck,

howard

 

Personaly I think my location is ideal.

 

cheers..

Howard a nice equal distribution is what the aim is.

i was tempted with 1 jet in each runner in the plenim. I was thinking about the response time of the system and how it functions and came to the conclusion that i should really treat it as a injector. ( i may be wrong )
I am worried about the wash over effect on the IAT.
after i posted the inital idea i had a brain wave. if i inject just into the seconday runner am i not going to get a cold face on the rotor. but then i was thinking about how the stock car works with odd sized primary and seconday injectors.... so now i dont know what to think.

I have run the inverse version of pimpyhand which worked really well but i wanna up the stakes a notch with this. What sizes are those jets ?

Richard has been kind enough to give me extra blanks so i can have a few goes at it. I really feal it needs to be after the TB.

This one is out to tender really so the more suggestions and ideas the better.

I think my un even patten may have been down to the stock elbow and my jet location. I dont think the controller or pump played any part in that.

Scott

 

1mm x 2

 

my idea about placing these jets in the runners or even the plenum is that they are placed in a very small area. i would assume deatomization would occur more frequently due to the higher likelyhood of liquid contacting metal. im not entirely sure that placing the jets in that type of a location would be able to relate to repeatable results during operation.

i am convinced that the best place to place them (when choosing a point beyond the TB) is as close (and pointing at) the port as possible. . . much as howard has pointed out in the past.

 

I am happy to place them in the UIM. but since i am using stock twins i dont want to remove the turbos etc to use the LIM. i agree the closer to the ports the better.

I am looking for some real objective views and ideas to try and make this setup differant and work in the manor intended. ( rotary )

Scott

 

this diagram is fully rubbish... but



what do we think. It is the UIM

 

Don't laugh, there are four ports, here are the primary and secondary injector located?

 

So would you really want to spray in all ports or would you just really want to spray in both housings? I think the main thing is to have it spraying evenly in both rotors. I'm not to convinsed that spraying in all ports really matters all that much, but of course I"m no expert. Pimp hand I know in the other thread we where not all that cool, but I just gotta say I really like your setup as far as nozzle placement. I'm trying to do the same thing in my fc tbi however it's a bit harder being that it's not as big as the fd tbi.

 

I think that the primary runners ( the center 2 ) are joined at the joint i am thinking of using. My main reason for this is....I cant see the point in spraying at the butterflys. This way i should get more spray into the place i want it.

Scott

 

do you think it has more of a chance of atomizing the further away you are (of course not to far). Also what about evenly mixing the mixture. Does it have time for this placing them in the uim? Just wondering.

 

good points. Im really not sure. I have not had many takers on this thread so i may just have to suck it and see....

Scott