tom0613

iTrader: (2)

which one is better to turn the boost up more. and which one has more octane

ProshopXB

Well both do pretty much the same thing. But the meth can be turned off and on some what, where the race gas is always there.. I think it also may come down to how readily available is race gas to you.

ProshopXB

Oh and the water adds a cooling effect... and race gas dosent.

Nick06tC

im going the meth rout so i am interested in seeing the answer.

My understanding is its two totally different things going on. The water/meth in jection is not being used to be burnt, it is being used to cool and deter detonation by cooling cylinder temps. And with a progressive controler, you can run it at only WOT or high boost apps.

jam0321

you are absolutely right with your first statement. The water/meth injection is not a fuel replacement. It is used to deter detonation. Because it drastically brings down cylinder temps and slightly raises octane rating in pump gas you can advance timing to get more power. Adding boost is still dependent on the ability of the motor to handle it. Pressure is still pressure whether it is 105 octane or 91. the pressure in the cyclinder will be the same so keep that in mind.

As far as when it can be used is unlimited with a variable controller like the one in the Spearco kit. You can set it to start spraying at 0.1psi if you'd like and it doesn't have to be at WOT. HOWEVER, if you set it to turn on to soon, you will be flooding the engine with water/meth. I was able to see this on my dyno runs after the Spearco install. The more we turned up the water/meth the lower the power numbers. But when we set the water/meth to inject from 7-9.5 psi at a low flow rate the numbers jumped up drastically.
Every set up is different so find out what works for you

kytc

Meth is the equivalent of race gas. It raises the octane of your fuel which is the reason you can increase timing and lean the afrs out. The big thing is that you will not waste the meth in unnecessary "off-boost" times like you would if you used race gas which makes the meth MUCH MUCH MUCH cheaper than race gas (race gas is outrageous, well here at least)

ProshopXB

I will also be going the meth/water, I think it will yeild the best results overall for me and my application.

IceNine

Water/Meth all the way.

You can get water/meth at Wal-Mart. Can't say that about race gas

And yes, as has been said before, the cooling properties help things along. But most of the water is already evaporated before it hits the cylinder.

And Methanol IS being burned.... Methanol is a very slow-burning fuel. That's how it increases octane - by adding the slow-burning properties in the combustion chamber, thus preventing predetonation.

kytc

If you don't mind keeping the tank full and getting a good tune on it you can't get a much better forced induction cooling solution.

IceNine

It's also important to note that as a chemical intercooler, it's far more efficient than other forms of intercooling for low-boost applications (under 20psi) because there's no additional piping to fill.

XD40tC

I dont know much about this but can this help me runner a bigger shot of nitrous safer or is this only for FI?

ProshopXB

I beleive you would only want to use meth/water injection with F/I and deisel applications..

XD40tC

Ok thanks! Im just trying to see what options I have for safer power now that Im running nitrous.

IceNine

You still get the anti-detonation properties, but Nitrous itself is an excellent intercooler.

So yeah, you might be able to pull off a bigger nitrous shot.

ProshopXB

Would race gas help him with nitrous?

IceNine

Eh, doubtful, since Nitrous alone isn't a direct factor in detonation. It's a major intercooler.

XD40tC

In the ZEX manual it says for 55 im good with stock plugs and timing. For 65 it says to pull back timing 2 degrees and get colder plugs. For 75 its 4 degrees. Should I be safe getting colder plugs and running the 65 shot jets for nitrous and fuel? Just asking. I wont do it if Im risking a lot.

ProshopXB

Well thats one more thing in life I know now...

Karl are you running a Snow kit?

XD40tC

Actually sorry, didnt mean to jack this thread. No more questions about this from me.

ERIC-TC

Nitrous already cools the intake charge. What you need is more fuel to be safer with nitrous.