Anyone used methanol injection yet? I've been doing a little reading about this and seems like a pretty good upgrade, pretty decent power gains as well

 

def need it if your gonna run big #s for boost or w/o an intercooler it's a must

 

Methanol injection = Downgrade

 

I hoping to pick up a kit soon. Plan to use my windshield wiper box as the reservoir. It does work to cool air temps and the higher octane of alcohol helps prevent detonation. I just need to see how far on pump gas i can go before I need the meth. I've already hit 18 psi on a dyno with no problems, and on that boost I may not need meth to run the times I hope to run.

But its good insurance. I just dont know what size nozzle i'd need. They come in many lbs/hr type flow sizes and I am just not sure how to determine what is needed. I havent looked into it yet.

 

You can pick up good power if you compensate for the extra fuel. This is hairy with a carb since if the meth fails, then you are lean. I picked up a lot of power spraying E85 into my blower with only 9 psi but overspinning the blower. By a lot, I mean at least 50hp. It was undeniable.

Every 10 degree drop in intake temp is 1% power increase. 100 degrees seems to be the norm for a good spray.....

 

i'm running a snow stage ii kit, keeps my air charge nice and cool

 

I pieced together a kit with the coolingmist pump and parts from mcmaster. It has the EDPM seals for straight methanol. The 730 ECM controls the pump, fuel, and timing. Without the alky mix I get knock on tip-in during boost. The mix cools the charge and the ECM pulls fuel and adds timing. It works great with the intercooler.

 

What in the 730 controls the meth pump? I was thinking of just using another hobbs switch and start the flow at 5 psi, maybe 8-10 since I've run 14 with no problems, no sense in wasting it at 5 psi

 

I was planning on running a CSU prepped e85 blow-thru carbed but after researching and finding out how fast the e85 burns, i decided to just do pump gas with a/a intercooler and then add water/meth injection later if needed.

 

I added code to use an unused output pin on the 730 ECM. It uses a 3D table of rpm and boost. The frequency is 10HZ. I tried 5Hz on the bench but it was too fast for the pump. It ends up being a percentage in the table with a resolution of 12.5%. The nice part is being able to adjust the volume vs rpm.

With your setup the variable on time is unnecessary. A simple Hobbs switch set like that would work just as well.

 

The only reason i considered the hobbs is because i have an unused vacuum port on my elbow. Code would be nice and easy. I just need to figure out how much volume i really need. I have no idea. I really just wanted to add a plate nitrous kit and spray it with a 100 and cool it that way

 

Methanol is not a downgrade, it is a huge upgrade on boosted engines because of its knock retarding properties that can't be beat... why else top fuel guys run methanol/e85/alcohol dragsters? For the extra air intake cooling and higher octane

I have a meth injection kit on my 4.3 fuel injected truck. It runs at 8-9psi (until I can get more fuel to it). I'm seeing a nice drop in air temps, about 20-30deg, and about .5 drop in AFR (without an intercooler at this point) I have a cooling mist basic kit I got on ebay for 80$, and I sneak out absolute methanol from the lab I work at school in water bottles. I use 50/50 meth/distilled H20. Methanol is great for increasing the octane rating of the intake charge = less knock... but if its not broke and doing fine without it then......... Of course your engine is completely different than mine, I saw someone say something about a carb.

I would steer away from meth injection if you're engine is carbed and you're doing this yourself. Not that it's bad at all with the carb... but you can get similar results with a bigger/more efficient intercooler and octane booster/race gas, it's just more expensive. This goes for FI too. Problem with the carb is there's no way for it to know how much extra fuel you're dumping in and at what alcohol ratio compared to the stoich value of your pump gas, or any way of changing AFRs by manifold pressure or rpms etc... it's like drinking coke and then having a shot of everclear coming in from no where... unless you can program it in to be ready for when that shot goes down your throat, then it's always gunna be like... what the hell just happened. Of course you could play with jetting and pump pressures etc but thats a helluva lot of work.

Whether you decide to or not depends on a number of things, how much boost? Carb or fuel injected? What operating/tuning system do you use for tuning? What instruments are you using for datalogging...do you have a wideband 02? What type of intercooler do you have now? What gas do you use or want to use? In general, a good 3 core intercooler and 93 octane will get you safely to a little over 14 lbs of boost on most any engine if tuned properly. Meth injection is for you if you're running some serious boost or plan to boost over 14-16psi.

edit- one thing to keep in mind, 100% methanol with too much jetting can very well slow your engine down a LOT coming onto boost if not tuned properly. If the AFR's are too low/rich with the meth, it will bog down the engine and you'll be driving a boosted land boat (ask me how I know)