Direct Port Meth Injection

[hawkeye93]

ProMeth offers a direct port meth injection kit, and rumor has it that Livernois is going to direct port, which led me to think about it a little bit.  One question I have is with direct port injection, the ECU won't see the lower temps from the meth at IAT2, because the spray will occur after the sensor.  So would it be better to spray at the ports and pre-TB, so that IAT2 at least seems some temp drop?

Based on the calculations from ProMeth's web page, my car would want approximately 12 GPH of 100% meth. 

425 hp (estimated) * 1.75 / 63 = 11.8 GPH

So I'm thinking maybe 1 GPH nozzles at each port, plus a 5 or 6 GPH nozzle pre-TB would be a good compromise.  I'm currently running a single 10 GPH nozzle.  I can always make injection adjustments with the Alky controller. Thoughts?

[StealBlueSho]

Sooo.....

LMS already has direct port meth injection. However, at this time, they are only performing the upgrade in their shop. It requires drilling and tapping into the existing intake manifold for the injectors.

The IAT2 sensor resides at the top of the intake manifold I believe which would mean even with direct injection the IAT2 sensor would still see temperature drops. Maybe not as much as spraying directly onto it....

[hawkeye93]

But the flow is back & down, so if you're injecting just inches from the bottom of the manifold, I don't think a sensor on top of the intake will see a temp drop.  Hot air/fuel mixture is coming in, and the cooling doesn't occur until it's nearly exited the intake manifold.

Does the LMS direct port system only inject at the ports, or is there supplemental injection pre-TB?

[Frozen Blue]

But the flow is back & down, so if you're injecting just inches from the bottom of the manifold, I don't think a sensor on top of the intake will see a temp drop.  Hot air/fuel mixture is coming in, and the cooling doesn't occur until it's nearly exited the intake manifold.

Does the LMS direct port system only inject at the ports, or is there supplemental injection pre-TB?

When I was running an Aquamist HFS-3 direct port setup on my ST I had one nozzle directly before each cylinder and a 5th nozzle at the outlet of the intercooler. The 5th nozzle is placed as far from the throttle body as possible and after the intercooler to allow more time to pull heat from the air charge. The direct port nozzles act as an aux fuel source and the 5th nozzle to assist in charge cooling.

I assume the same concept is being applied to the SHO setups.

[hawkeye93]

For what it's worth, I thought I'd share an exchange I had with ProMeth, as it answered a question I had regarding direct port meth injection.  I know LMS is moving to DP, and I've been considering modifying my single-port system.

My question:

I've been looking at your direct port injection systems, specifically for my Taurus SHO application, and I have a question.  When cruising, and the intake is under vacuum, how do you prevent the meth already in the lines from being sucked into the intake, either by gravity or vacuum?  Even with a check valve or solenoid in front of the distribution block, that still seems like a good amount of meth that would be ingested.  Maybe that's OK, I don't know.  In my current setup, I have a check valve 8 inches in front of the single nozzle (pre-throttle body).

ProMeth response:

You are correct. The lines after the distribution block are susceptible to the fluid exiting out of the lines. If you prefer we can spec out a system in which each nozzle has a check valve setting directly on top of it. We do not have these listed on our website but it is something that we carry and have in stock and have been using in other various applications. Below is a picture of the check valve shown next to our D-Block and installed. We have offer them in both flow directions as well.

https://www.instagram.com/p/BOImgJ_DN1q/?taken-by=prometh_injection

[J-Will]

for direct port injection, you want to spray as little as possible using the smallest droplet as you can get for the single purpose of boosting effective octane.  You might get some cleaning benefit from this as well.

For cooling, you'd want a 7th nozzle just after the CAC with a decently sized nozzle