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Old 02-07-2013, 02:17 PM   #1
neo8222
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Default dual nozzle meth setup?

At the moment I have a SMC single nozzle methanol system in the car and it's working but I want something better. I obtained a AEM heavy duty 5 gallon system from my tuner and we were talking about a dual nozzle setup.

I have some questions about the best way to set it up. Originally we talked about tapping the manifold and directly injecting but looking at the manifold this would seem to favor more methanol to certain cylinders which is a BAD thing.

So my question is this, has anyone direct injected a dual nozzle methanol setup? Is it possible? good or bad result?

These are some additional scenarios I can think of that seem a viable option:
Twin nozzle, one in front of the TB and one behind TB
Twin nozzle, 2 small jets opposing each other in the IC piping next to the TB for better atomization.
Twin nozzle, tapped in directly behind TB if possible
Single nozzle, In front of TB with a larger nozzle
Single nozzle, Direct injected tapped into manifold

Hopefully some of you will have the experience with this I'm looking for.
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Old 02-07-2013, 07:28 PM   #2
Mosting3
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very good, am with you and subscribed for an answer.
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Old 02-07-2013, 07:35 PM   #3
jaxscuby
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have done several "dual" and "triple" nozzle set ups.

usually 1 before throttle body and the others in intercooler piping.

Last edited by jaxscuby; 02-14-2013 at 07:14 AM.
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Old 02-07-2013, 09:49 PM   #4
neo8222
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I could see that being a good option with a TMIC, however correct me if I'm wrong, but it seems like with one in be piping before my FMIC that there would be enough of a delay before the meth gets into the engine that it would be hard to tune for it correctly.
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Old 02-11-2013, 06:10 PM   #5
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There will not be a great delay because there will be some residual meth left in the inlet tract from the last injection event. Nozzle at the exit of the FMIC will allow more evaporation time. Droplet decrease in size as it evaporates, lighter molecules improves cylinder distribution.
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Old 02-14-2013, 03:49 PM   #6
neo8222
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So what your saying is install 2 nozzles of the same size, one at the exit of FMIC and one in front of the throttle body? It would still seem like with the initial hit when there would not be any methanol in the system yet there would be a small moment where the AFR goes lean for a second.

Also considering devils own direct injection kit and just tapping a small nozzle into each intake runner. Anyone tried this setup before?

Last edited by neo8222; 02-14-2013 at 04:11 PM.
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Old 02-14-2013, 04:03 PM   #7
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It doesn't have to be the same size. I suggest installing two nozzles along the flow of air, some 3 inches apart. You will get a better distribution and coverage.

Most ECUs have "acceleration enrichment" fuel map inbuilt. For turbo engines, it is not as important because turbo takes some time to build boost. Some pump speed system take some time achieve full flow especially the trunk mount type. For those system, the manufacturer always recommend TB injection.

For SC engines, port injection will be a better option.
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Old 02-17-2013, 03:52 PM   #8
dstroy
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Tip-in enrichment. You wont be at full boost when you select 100% throttle with your foot. Plenty of time to pressurize that tiny meth line and start spraying.

Quote:
Originally Posted by Aquamist View Post
It doesn't have to be the same size. I suggest installing two nozzles along the flow of air, some 3 inches apart. You will get a better distribution and coverage.

Most ECUs have "acceleration enrichment" fuel map inbuilt. For turbo engines, it is not as important because turbo takes some time to build boost. Some pump speed system take some time achieve full flow especially the trunk mount type. For those system, the manufacturer always recommend TB injection.

For SC engines, port injection will be a better option.
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