What kind of ratios are you water/meth guys running?

[Mister T]

I'm curious as to what ratio of water/meth seems to work best for you guys. Myself, I've found about 70% meth 30% water seems to work well. Also, do you find that the presence of steam and oxygenated combustion by-products (from the methanol) tends to skew your A/F readings a little to the lean side?

[The_Jerbel]

Re: What kind of ratios are you water/meth guys running?

A 50/50 mix works well. While I don't advise using it because of the flammability and toxic/harmful nature of it, 100% meth works best.

Meth injection will actually cause the A/F to run slightly more rich than without it.

More info on meth...

[BaggedGLI]

Re: What kind of ratios are you water/meth guys running?

I was running 50/50. But this time around i think im going to try some 60/40 meth/water.

[Mister T]

Re: What kind of ratios are you water/meth guys running?

A 50/50 mix works well. While I don't advise using it because of the flammability and toxic/harmful nature of it, 100% meth works best.

Meth injection will actually cause the A/F to run slightly more rich than without it.

More info on meth...

Now, are you saying that the actual A/F ratios will be richer (which they are because methanol is fuel). Or will the measured A/F ratios (pre-cat o2 Voltage readings) appear to be richer. The reason I ask is because apparently the extra oxygen from the burnt methanol is what skews the readings.

See, I'm not so sure that 100% meth would be best. The reason being is that: 1) you won't get as much combustion cooling/octane increase as you will with some water (which has an infinite octane rating since it can't combust) and 2) (If I understand correctly)When water undergoes it's phase change from water droplets to steam this produces an expansion which increases the cylinder pressures and results in more torque. I can actually confirm that my car pulls/feels stronger when I run closer to 65M/35W than at 75M/25W.

Here are a few of the articles that I've found which may be of interest:
http://www.max-boost.co.uk/max-boost/intake/WI.htm
http://www.3si.org/forum/f164/water-...tion-q-416206/ (I've seen this one on numerous sites)

[The_Jerbel]

Re: What kind of ratios are you water/meth guys running?

The actual A/F ratio is decreased, and the measured A/F ratio readings also show up richer.

I'm just reporting what I've found to work best. I've used 100% meth and the IAT's as well as timing CF's were lower with 100% meth as opposed to a meth/water mixture. It's dangerous to run pure meth for a few different reasons, so it's a good idea to mix water in with it.

[Kor]

Re: What kind of ratios are you water/meth guys running?

As said you want to mix water with it, you will have better results, don't run pure meth

[Mister T]

Re: What kind of ratios are you water/meth guys running?

The actual A/F ratio is decreased, and the measured A/F ratio readings also show up richer.

So I guess my next question is what happens to the oxygen contained in the methanol molecule? Obviously a good portion will be consumed in the combustion cycle. However, since no combustion event is 100% efficient, wouldn't it stand to reason that there would be some residual oxygen in the exhaust? Therefore skewing the O2 sensor readings towards the lean side?

Also, in application I have found that Mohawk 94 oct E10 causes about a 2-3% positive deviation in my fuel trims vs non-oxygenated 91 oct.

[Kor]

Re: What kind of ratios are you water/meth guys running?

As long as there is enough fuel then the extra oxygen will burn.

[Mister T]

Re: What kind of ratios are you water/meth guys running?

Although most of it will burn, not all will. Like I said earlier, all combustion events will leave some trace elements which is why the O2 sensors are there in the first place. I guess what I'm getting at is that when you start adding oxygenated fuel to a combustion event, you are adding a disproportionate amount of O2 vis a vis straight gasoline and air. So the only way I can see the O2 sensors interpreting that extra trace O2 is that they would register the A/F ratios to be leaner than they really are.

[The_Jerbel]

Re: What kind of ratios are you water/meth guys running?

you start adding...fuel....

You said it right there. Sure there may be some residual O2 molecules after the combustion reaction, but you are adding a whole lot of fuel when you spray meth/water into the combustion chamber. You are raising the fuel content a lot more than you're raising the O2 content. That is why your A/F ratios decrease and get richer. I'm also speaking from experience, here, not just theoretically or hypothetically. I've watched the A/F gauge on a non-meth pull, and then watched it again after adding meth. The A/F ratio goes down slightly.

[Mister T]

Re: What kind of ratios are you water/meth guys running?

Have you seen the differences using a 50/50 water/meth injection? Just wondering if the steam makes a difference.

[The_Jerbel]

Re: What kind of ratios are you water/meth guys running?

I've noticed that the A/F ratio is richer while using W/M injection in a variety of different mixture ratios- 50:50, 70:30, 90:10, even using windshield washer fluid...

[Mister T]

Re: What kind of ratios are you water/meth guys running?

Any idea what percentages the blue -40C wiper fluid is?

[The_Jerbel]

Re: What kind of ratios are you water/meth guys running?

Roughly 30% meth.

[dogbreath]

Re: What kind of ratios are you water/meth guys running?

You can run windsheild whipper fluid this is good to know.