I posted this in 2 other threads a while ago but I will repost it here for you. Hopefully it helps. It is a bit of a long read...
There are POTs to adjust when the AM starts to inject meth/water. I have mine set at 15PSI, on stock twins I had it at 12 psi. You really don't want it injecting when driving around town. Only when you need it. Otherwise you just waste it and run the tank down for no good reason.
http://www.aquamist-direct.com/806-582-replacement-160psi-water-pump-for-hfs-2-3-4-6/ <--I run aquamist so it is what I am familiar with but I am sure there are other pumps that are similar. The pump can be adjusted to over 280 psi. 3000CC/min pump.
Power obeys the I/square law. If the bypass pressure is increased from 160psi to 250psi, the average current draw will increase from 7A to 11A. Power dissipation will be more than doubled. Using the I^2 R formula, the power will effectively increase from 49W to 121W under the same load (R). Power increase is proportional to operation temperature rise, the pump will run much hotter. Aquatec (manufacturer) advise against pressure over 180psi for long term reliability.
I installed my aquamist kit. If you have any questions while doing the install I am happy to help. As long as you follow the directions and set up as the install manual says it is the best meth kit on the market in my opinion. Tap the white stripped purple wire in front of the shifter for the gauge illumination, trust me you want it to work. I put mine in the DME compartment but you can also locate it in the glovebox. DME box just seems easier and it fits perfect and you have to make connections in there anyways. Harness is long enough to run into glovebox if you want. .
http://howertonengineering.com/calculating-jetting/ <--read this
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Selecting the correct jet or jets for the required flow:
- Calculate the "true" pressure by subtract the 160psi pump pressure by the "boost" pressure
- Select the jet or jets from "true" pressure from the chart below (compensated).
- Always pick the next size up or allow 10-15% more to allow more headroom.
For longevity they want the pumps to run under 180 psi. Dead head pressure vs. real life are different. So I agree and assume a 150psi - boost for an ideal nozzle. 20psi would be the 130 psi line. That is how I size my nozzles. If anyone has better logic let me know. You can always just flow your system and see what it really makes per min per nozzle.
http://www.aquamist-direct.com/806-401-twin-fav-direct-port-bundle-option/ <-- Just run a twin tank twin pumps if you need more flow and match your PSI exactly with the adjustable pump. Twin FAvs to your distro block. Run two 1500CC or 3000cc AM pumps at whatever PSI you want. Should be more than enough meth flow for an n54 and let you play around all you want with high PSI injection and have all the headroom you want.
100% methanol: 20-25% methanol/fuel ratio or 1.5-2cc per BHP. 600whp would be say ~700 BHP so aquamist says I should be running 1050cc - 1400cc of meth + 93 octane. I run roughly a 1000-1100CC in my CP with two nozzles last I checked and did the math. I should probably switch to direct port at some time but I think I am done with spending money on this platform. Once you go above 600whp you will need the larger 3000cc pump or two 1500cc pumps. Personally the single larger 3000cc pump probably makes the most sense.
I also do not see the need for a 3/8 line for meth. That is pretty large. Roughly 2x the size I would think you would need. You would have to step it down anyways at your flow sensor and FAV most likely unless there are some that accept a 3/8 line.
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I just did all the math the other day as I was considering going direct port meth.
100% methanol, 20-25% methanol/fuel ratio or 1.5-2cc per BHP. 600whp would be say ~700 BHP so aquamist says you should be running 1050cc - 1400cc of meth.
Pump output is at 160, subtract 30PSI for your boost so you are at 130 on the chart. 0.4MM would be 140CC. 140CC x 6 = 840CC total. A bit low...I would suggest 0.5mm 180CC x 6 = 1080. You could also use 0.6MM and hit 1440CC but then you will not have enough flow for one in your CP(not essential)
Your stock pump can only flow 1500CC so you are still under. If you go with 0.5mm you can add one nozzle in the charepipe if you wish. As twisted said, it is not required. Normally for IAT cooling it is double the size of your DP jet, rule of thumb iirc, so 360CC would be the goal size the 0.8mm would probably make the most sense at 340CC. 0.9 is 380CC. or I guess you could spray 2 0.5mm in the CP for AIT cooling and hit 360CC exactly. 1080+ 380 = 1460 so that would max the pump as well and at the end of the day you would be spraying as much meth as the 0.6mm DP nozzles but potentially have worse distribution.
http://www.aquamist-direct.com/806-...igned-specially-for-direct-port-applications/
or
http://www.aquamist-direct.com/806-400-direct-port-bundle-options-this-shop-only/
If you want to keep all aquamist parts in your system. I plan on doing this mainly because of their reputation and I like more parts all from one vendor. I am sure the parts twisted offers are of similar quality etc and he also offers a full complete system with everything you need except a tank.
For a tank I vote to get a sump'd/baffled tank so you do not have pump starvation issues. This is what I use, two tanks, the baffled tank is what the pump draws from, other tank is to feed baffled tank, low fluid warning, LED indicator light, micron filter, pump, etc.
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Be wary of unbaffled tanks:
Edit: the aquamist hs4 is the best designed meth injection kit for DI motors that I know of. But you do pay for it. I really like the failsafe that if there is a flow interruption etc it automatically opens the waste gates to save your engine. This is not spray n pray which is how some other less expensive kits do it. As with all port injection on top of DI make sure there are fail safes in place and you are using quality components.
All that being said pure meth dp injection seems to be the winner unless you have an easy e85 fill up. You also do not need 2 or 3 low pressure fuel pumps and everything else required to fuel 100% e85 aka overspinning the already weak HPFP. Just my thoughts.
Devil's own chart:
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More PSI helps but it not needed unless you are trying to avoid running more nozzles. After 2-3 in your CP you should probably switch to DP anyways as you are flowing a good deal of meth most likely. I can't see an advantage in running smaller nozzles.
Here is any rough chart for approximately much to inject:
View attachment 32809
If anyone wants to run a fuck ton of meth this seems to be the bee knees of meth pumps:
https://www.rbracing-rsr.com/waterinjection.html or
https://www.miltonroy.com/applications/high-pressure-methanol-chemical-injection-applications/
I don't have a picture handy of my CP but it's pretty simple. You drill and then tap two holes directly across from each other before the TMAP. Install the aquamist bung w/ loctite. Install the appropriate nozzles. You always want to run more nozzles that are smaller vs less larger ones. You get much better atomization this way.
I agree 100%
