[Mr. 5]

I think that the Methanol Injection is really working with my MPG increase.
I used to get an average of 20 mpg between driving madly on the street and cruising on the freeway, but 6 months ago it seemed that I couldn't get any higher than 16.5 MPG combined.
Now I am back up to 19.6 MPG.

I added a catch can a while back to help with the oil blow by but the catch can was going to do nothing with all of the oil that already bypassed the system.
I tried the sea foam which helped a bit but that can only do so much.
I was seriously thinking of taking off the manifold and cleaning the valves, but it seemed so much easier to add meth. And, meth is a lot more fun.

I added the Snow Performance stage 2 a while back and although people said to start spraying at 8+ psi, I wanted the meth to come on more frequently and a little sooner for cleaning purposes.
So, I started the spray at 5 psi, and I believe it's working.
The way the stage 2 works, there is a starting point and a 100% point, so my starting is 5 psi and my 100% is 8 psi.

I really think that the Meth is helping.
Has anyone else shown an improvement with their MPG after adding meth?

[mwahlert]

well i guess it makes sense - if you are running a flash tune, when you start spraying meth the afr is richened by the additional fuel, therefore the ecu is able to reduce the amount of fuel required to maintain said afr....

i think?

[GreenPlease]

Just make sure you adjust for the fuel value of the meth. Your MPG numbers will be slightly lower

[Mr. 5]

Originally Posted by mwahlert

well i guess it makes sense - if you are running a flash tune, when you start spraying meth the afr is richened by the additional fuel, therefore the ecu is able to reduce the amount of fuel required to maintain said afr....

i think?

I don't think it has anything to do with that because it took a while for my MPG to go up after I installed the meth kit.
The meth did not clean my intake valves over night. It took about 4 months.

Originally Posted by GreenPlease

Just make sure you adjust for the fuel value of the meth. Your MPG numbers will be slightly lower

What do you mean? Are you talking about the overall cost?
I don't give a crap abut that. I'm more concerned about a cleaner running more efficient running engine.

[GreenPlease]

What's are tank? ~18 gallons? Say hypothetically you go through a gallon of meth per tank.

Methanol: 62,800btu per gallon
Gasoline: 125,000btu per gallon

Over one tank of gas, you meth will add about 3489btu of fuel value to each gallon of gasoline, or ~2.8%. Thus your 19.6 is really more like 19.05, meaning that your cleaner valves are responsible for a ~15% improvement in fuel economy ceteris paribus

[Mr. 5]

Originally Posted by GreenPlease

What's are tank? ~18 gallons? Say hypothetically you go through a gallon of meth per tank.

Methanol: 62,800btu per gallon
Gasoline: 125,000btu per gallon

Over one tank of gas, you meth will add about 3489btu of fuel value to each gallon of gasoline, or ~2.8%. Thus your 19.6 is really more like 19.05, meaning that your cleaner valves are responsible for a ~15% improvement in fuel economy ceteris paribus

I understand what you are saying, but what's interesting is that I never saw this in the beginning. Another thing to think of is that the meth is not spraying all the time. Usually when it's spraying is when I'm getting the worst MPG because that's when I'm on it.

Cruising MPG has gone up and that's when meth is not spraying so it shows that the cleaner valves are helping.

[AltecBX]

So Running meth cleans valves better than the sea foam?

[cstavaru]

I think you just got bored of flooring your car

Seriously, I was hoping for a mpg increase with methanol too, but I am really afraid of the long-term implications on engine corrosiveness. Also, changing oil more often (as required with methanol) offsets the mpg increase (in fact, it costs more).

[Alpina_B3_Lux]

Originally Posted by cstavaru

Also, changing oil more often (as required with methanol) offsets the mpg increase (in fact, it costs more).

Seriously, who of all the hardcore modders in this forum cares about some more bottles of oil or cost efficiency in general? Craig already said it's more to do with reliability of the engine due to the cleaning faculties of meth than about the actual mpg increase.

Alpina_B3_Lux

[lamia2super]

I do no more then 280 miles to the tank and usually get 260 miles on a tank tho. If you do the math 280= is almost 19 mpg and 260=~17 I drive pretty fast so that's not bad, but I do try to hold myself back from slamming the petal.

On the highway its a different story. I switch on the cruise control and activate the economy mode on the procede and I see 30s

as far as meth goes i think i spend more gas cuz i have to punch it to spray it, which i try to avoid in my MT stage 4+ 335i (thats so hard not to do)

if you are really saving gas then you probably wasting more methanol which is more $$$
theory: car senses more fuel and holds back on the gas i guess

[Mr. 5]

Originally Posted by lamia2super

if you are really saving gas then you probably wasting more methanol which is more $$$
theory: car senses more fuel and holds back on the gas i guess

It really isn't working like that.
As i said already, my cruising MPG has gone up and when I am cruising, the meth is not spraying.
How can I be wasting methanol and using less gas when the meth isn't even spraying??

Remember that I had this kit on my car for 4 months and I am finally seeing some results.

[mwahlert]

Originally Posted by Mr. 5

It really isn't working like that.
As i said already, my cruising MPG has gone up and when I am cruising, the meth is not spraying.
How can I be wasting methanol and using less gas when the meth isn't even spraying??

Remember that I had this kit on my car for 4 months and I am finally seeing some results.

so maybe the valves really DID get a good steam cleaning!

[R1000K3]

Originally Posted by AltecBX

So Running meth cleans valves better than the sea foam?

Most certainly. Sea foam will not remove hard carbon by a quick and simple treatment. This is only possible with something that penetrates the valves for an extended period. If you ever have tried to remove carbon from valves you know it is very hard to remove, and not something that is possible to do by a quick treatment with sea foam or similar products.

[zsapphire7]

a good bonus to using meth

[Mr. 5]

Originally Posted by R1000K3

Most certainly. Sea foam will not remove hard carbon by a quick and simple treatment. This is only possible with something that penetrates the valves for an extended period. If you ever have tried to remove carbon from valves you know it is very hard to remove, and not something that is possible to do by a quick treatment with sea foam or similar products.

Yep. Seafoam is a great thing to do every once and a while but it is not cleaning all the time. Meth is more of a constant cleaning agent.

[lamia2super]

Originally Posted by Mr. 5

It really isn't working like that.
As i said already, my cruising MPG has gone up and when I am cruising, the meth is not spraying.
How can I be wasting methanol and using less gas when the meth isn't even spraying??

Remember that I had this kit on my car for 4 months and I am finally seeing some results.

idk then maybe you engine is getting a cleaning like everyone is saying

[R1000K3]

Actually, I believe it is the water steam that cleans carbon. Whatever, as long as it keeps the valves, piston heads and combustion chambers clean.

[zsapphire7]

is it possible to just run water when DD? Turn the IC settings more conservatively when doing that using vishnu?

[hun77777]

just a thought... if i take one of the dci off and run some steam water (i mean mist) while my car is sitting in garage at idle, do you think that will cause any problem as far as cleaning valve?

[Mr. 5]

Originally Posted by hun77777

just a thought... if i take one of the dci off and run some steam water (i mean mist) while my car is sitting in garage at idle, do you think that will cause any problem as far as cleaning valve?

YES. It will misfire like crazy and probably die.
The best way to do it is WOT.

[R1000K3]

Originally Posted by hun77777

just a thought... if i take one of the dci off and run some steam water (i mean mist) while my car is sitting in garage at idle, do you think that will cause any problem as far as cleaning valve?

I wouln't inject water before the turbos.

[hun77777]

Originally Posted by Mr. 5

YES. It will misfire like crazy and probably die.
The best way to do it is WOT.

so if i have someone rev it at 4~5k then it should be fine? when i seafoamed my car, i let my friend to keep rev it to keep rpm around 3k but i'm just trying to see if water spray will do the same effect as seafoam. i came across few thread on various forums about debate on seafoam and water so i thought i'd ask.

Originally Posted by R1000K3

I wouln't inject water before the turbos.

why?