I bought a used SMC kit with a M15 nozzle and plan on running 100% Meth. I was told it was the latest version.

1. What is the best place and direction to mount the nozzle? Ive done alot of searching and havent really found anything conclusive. I have the Buschur UICP.

2. I will be tuning using ECUflash, what is a good/safe place to start with tuning? I will be running a failsafe with my Zeitronix, still have to get with TTP to find out how it works though.

 

I did something similar with a new/used AMS kit with the M15 nozzle and run 100% meth.

1. I'm not sure direction matters that much, but I'm sure slowcar will have a more informed opinion on that. But location is important. Personally, I would try to mount the nozzle higher than the pump or meth bottle, just so that it can't gravity feed overnight, or however long you let the car set. Also, mount the nozzle with a short distance between the pump and nozzle. Both of these points should help minimize meth continuing to flow when you don't want it to. Lots of talk about cylinder wash and excessive wear from excess meth when it's not needed.

2. I'd start with whatever tuning you currently have, and let the meth do it's thing. This way, you know you'll be pig rich when it's spraying, and all you'll have to do is start taking out fuel to compensate. I start my meth at about 11#'s of boost. This gives a decent window for acceleration (like daily driving) without the meth activating, but yet still allows it to start spraying before peak torque. If you start it too low of a boost pressure, I think that will just compound the issue of cylinder wash and have the meth spraying every other throttle input, even when you don't need it. Not to mention the waste of meth. W/O meth, on 93 octane, I could only run about 22-23#'s of boost and 20 degrees max timing at 7500 rpms. If I retarded cam timing, I might be able to get away with more boost or timing, but it didn't seem to make anymore power. With the meth (M15 nozzle), 30#'s boost on 93 octane and 21 degrees of timing does not cause knock.

Hope this helps. Oh, and this is on a 50 trim, but the principles should still apply to your application, but the absolute numbers may be different.

 

Just curious why you would'nt want to start spray pressure at a higher boost? I want to only be spraying meth when my motor wants it to prevent detonation, at like 22 lbs, I start my spray at 19lbs. It has always just seemed alot safer to me since I test my system regularly and am not relying on it for putting around.

 

It just depends on what responds quicker, turbo boost or meth spray. With my turbo and my meth setup, it seems the turbo boost rises quicker than the meth can keep up if I spray at too high a boost, and I get knock around peak torque. At 30#'s of boost I for SURE want to know the meth is there, so I start at a lower boost to give a little more time for the meth pump to come up to speed and reach full line pressure.

 

how about adding a aquamist dds3 flow sensored failsafe to your alky system? Detecting a reduced flow is much quicker than waiting for high afr/high egt/knock to happen and for the failsafe to react?

 

i'm not sure either, thats why 50% of the injection goes forward towards the TB and 50% backwards, towards the IC - either way, its 50% correct

 

you are spraying where it is least needed. at peak torque is where most of the action happens...

 

Well the kit I have is just a single nozzle and is just an elbow. Its going to be spraying across the pipe. Im wondering if I should spray it up, down, or across though? Also, about how far away from the throttle-body? I have the underhood tank and a Buschur UICP so the intercooler piping is pretty straight.

 

At the rate the air is traveling through the upper IC pipe at WOT, there is no meth flowing away from the TB.

 

Does it matter what position the nozzle is mounted though? Like I asked before, Im not sure if it should be spraying up, down, across or if it doesnt matter.

 

IMO, it doesn't matter which way it's mounted to spray.

How far away from the throttle body is debateable. The further away you go, the longer you give the droplets to evenly atomize/evaporate which is good..... or the longer you give the droplets to coalesce and form uneven distribution. Just depends on the spray pattern, velocity in your intake pipe and temperature. Anywhere in the upper intercooler pipe should be fine.