I am almost finished with my water injection installation and want to know where methanol is available for purchase locally. If anyone knows where to buy it in Washington, let me know!

 

run just water

 

Pumpless water pre-turbo =

 

By running just water how is the water combusted? Since the water wont compress will it affect apex seals? Just wondering, don't wanna hurt anything. Thanks!

 

1. Rotary has basically no real compression, it is almost impossible to hydro lock them in any normal conditions other than physically dumping water in a non-running engine.

2. The point of the meth / water injection in a rotary is to cool the charge, the engine internals, and to avoid pre-ignition. You also can run a lot less fuel.

If you have ever noticed how stupid rich people have to tune rotary engines in high boost / high power apps, they are in the 10.5 and 10 AFR range. They are using that extra fuel to cool, and are ending up making less power because of it.

Are you running it pumpless pre-turbo?

There were a few awesome papers online I read on how much better water injection was than meth, and how much fuel you could take out and still get the same or better results than fuel alone.

 

3. If you re-tune for the meth/water mixture, and the pump or system fails at all, you will go lean. Lean rotary without the meth = LS1 swap. If you tune with the water just being additional, you won't be rich like you would if you tuned with the meth/water additional, and if the injection fails, your engine has a chance of surviving.

Also about the water being combusted, it instantly turns to steam, and cleans everything out, including the spark plugs. If you run a bunch of water, I would pre-mix a little extra.

 

In addition to TweakGames comments, all that too much water will do is make your engine start missing.

My race only FD has water injection that comes on at ~8psi. No issues unless I am trying to run too much water.

One more thing: Water does not require tuning. It is a safety measure. If something happens to the AI system when under boost, you will get a little more knock, but with a conservative tune you should be safe.

Using AI with Methanol requires tuning for it, as well as safety measures to save your engine if the AI fails.

 

The main thing water dose is make the air more dense so it expands more when the charge is lit off by the plugs. As far as methenal, you can get it at Whitley Fuels here in Spokane, WA

 

Hmm interesting. Okay well, I have the AEM water injection kit, I plumbed the spray nozzle about 1 inch infront of the throttle body butterfly on my custom intake manifold so its post turbo. Supposedly the AEM controller has a boost safe wire that if wired to my Microtech I can set an auxillary map up that retards timing when this boost safe wire kicks on (that's if I can actually get that to work lol). As for timing and afr, right now I am roughly tuned under boost with semi rich afr's around 10 to 11.5 under boost. I understand that if I run the meth/ water mix the afr's become richer and I must lean it back out to the original 10 to 11.5 afr I already tuned to correct? So if I understand correctly, that when I run distilled water only I do not have to do any fuel tuning to my afr's but I can still increase my timing near the knocking range for more power just like the meth mix right?

This is new for me and I do not mind buying methanol or just running water I just want the best results for what my setup can actually help with on the engine. Thanks for all the interesting info guys

 

Also If I can get any better gas mileage I would love to... Right now its like a gallon an hour it feels haha. So if meth gives more gas mileage thats a big thing for me. Just wondering

 

You are running a rotary and worried about gas mileage? I'm sorry, but you are doing it all wrong.

Second, sounds like you are tuning this yourself. You RARELY get a second chance in boost after hitting knock. Stay as far away from that as you can. It's your engine, but I would just tune it completely normal with normal fuel and no AI. Then add the buffer of water injection as a safety/insurance policy, and not rely on the the AI in the base tune. (unless you have money and time for a rebuild, then cool beans.) That's at least what I would do on a DD type needing to be high powered and reliable. If this is a all out max effort rotary race car, then never mind.

~Tweak

 

dude, you live in washington. i would think it would be real easy to score some meth...

 

^ you beat me to it lol

 

Alot goes into tuning that most dont understand. A buddy and i have been testing pump 93 in our drag crx. b18 block stock sleeved and we ran 32 psi with no AI at about 8* at full torque which for those that have experience with timing and tuning know that at those boost levels 8* is alot of timing. Pump fuel can go further than most understand.