Im going to be putting a meth hit on #418 this week (after last week's pump 93 tune...it needs the octane!). Planning to run straight methanol in mine, and a significant amount..enough to hopefully top 30psi boost and run a pretty strong thing curve 6-8* above my pump 93 map. I ended up snagging a used Devil's Own kit for $200 shipped that has the 300psi pump, M10 & M18 nozzles, and progressive controller (low boost one though)
Im going to concur with the above poster RE: progressive vs on/off. Im thinking that the way your going to trim back the pump fuel in the DA minoctane secondary map is kinda "counter intuitive" in that your going to command an AFR leaner than actual so it jives with the meth spraying. I would think that a simple on/off is going to be a PITA where if you spray it too early, it's bog city. if you spray it too late, the knock sensor will be pulling timing before the meth comes in. And getting that activation point just right isn't possible because it's based on spool...which will happen at different rates in different gears. So a hobbs switch type setting that's perfect for a 1-2-3 pull from a stop will be way too late for a 3rd gear roll pull. I can just invision chasing my tail trying to run 1000cc of meth with simple on/off via load factor with one square of 4 cells that just can't be tuned right.
On a side note...I have an AEM multi-input progressive controller kicking around from a prior project, that can base it's activation off fuel Injector Duty Cycle...I kinda wonder if that might be the most ideal way of setting this up on a DSM/GVR4 that would be "smooth" to tune via secondary DS maps. In this setup you tie methanol flow to injector flow, which might make the DSMlink side of the tuning more "flat"...where your pulling out an even amount of AFR on the secondary DA map with rpm.
If you run a on/off activation: your DA correction map is going to be DRASTIC lean at the activation point and then taper off with engine rpm. The trick will be that first column!
As far as "best kit"....it's all the same stuff for the most part, and nothing is really all that special to make one kit a slam dunk over another brand. The progressive controllers are likely the main differentiation point. The mechanicals: pumps are pretty much universally shurflo 300psi pumps these days. All the lines/fittings are 1/4 push-lock generic stuff. Tanks...well..a stock windshield washer tank works just as well as a fancy $150 "hide the pump inside it" custom molded one. Nozzles are fairly generic.
AEM does make a pretty nice looking nozzle holder/check valve/hose fitting that's all one piece and very sanitary looking, but only has 3 size nozzles to work with (250/500/1000cc). I kinda like their progressive controller too as it comes with a full length wiring harness and all the fuse/relay is internal to be box...lends to a clean install on the wiring end.
AEM also offer a Meth flow gauge that has failsafe alarm and analog outputs..it's worth looking at, and I think we can log it in link and could use the alarm to trigger the secondary maps. The gauge only reads to 1000cc/min but Im reading the sensor might go higher via the analog output. It's like $260 gauge/sensor...but it might be the better way to go when it comes to safety and secondary map logic (at least for me, where this meth kit is going to be a fairly heavy part of my overall fuel/tune...not just a little spritz)
CoolingMist seems to have the nicest custom designed tanks, if your looking to drop money in that area. They have a trunk mount setup that hides the pump and wiring under the tank in a recess. Very clean looking install. Their electronics seem kinda "home brew" with little details online.
Devil's Own is kinda "generic" and basic...but probably the best value..they are a little cheaper new, similar with Snow Performance. These seem to be no frills and all function.
ProMeth.com Used to be A.I.S...they had nice kits too, but seem to be more intent on GM vette/camaro customers, and their new site doesn't have info/pics for the import/generic kits. But overall good quality.
Keep posting up!
TurboWOP is a meth/pumpgas guy...he's got some posts that can be searched up on how he ran his failsafe wiring/logic. I'd love to see a DSMlink log from his car as he runs the meth "on/off" and tunes around it in DA secondary maps. Would love to see how abrupt it looks and how the actual AFR's look on the log on spool.
food for thought: