thats exactly what im trying to do..... i dont know what people didnt understand about that

 

That's what I thought you were asking. I just got confused by how mike said that. I just wonder how, in the presence of boost, the meth will be metered into the engine. You'd maybe have a sensor of some sort to add, which would trip a relay to spray the meth due to heat, rpm, whatever.

 

E85 hasn't been available here since the only public station nearby that sold it closed down a couple months back. It was the same price as regular for a while, then cheaper, then all of a sudden it went up 75 cents per gallon. Then the place shut down.

 

HA! Sounds like good economics!

 

I ran across a MIT project recently that did this. They added ethanol alcohol as needed to quell detonation on a primary pump gas engine. Bumped up the static compression significantly over what straight pump gas will tolerate. Evidently the higher compression increased fuel effieciency by 10 or 15%. Of course the peak TQ and HP numbers went up along with the compression also. They predicted we'd likely see this in production cars in 5 to 10 years if I remember right.

If executed properly this would let you have your cake and eat it too and it certainly can be done. No Saturday evening project though. For someone who enjoys diving off into complex and challenging projects and has the aptitude it is completely do-able in my opinion. Take a look at the MIT project and you'll see it's been done before One other possibility worth mentioning is simply blending ethanol with pump gas in your tank as an octane booster. You'd need to make sure all the carb gaskets and other rubber parts were compatible and possibly upgrade. This would be a lot easier than a separate supplemental system.

Here's a link with lots of ethanol info. that mentions one of their studies about half way down the page:

http://en.wikipedia.org/wiki/Ethanol_fuel


I seriously thought about doing this myself. I was looking at going with a MegaSquirt ECM ( cheap DIY type controller with lots of support, under $400 assembled) to provide "3 dimensional" control of the alcohol system. You can check them out at www.megasquirt.org

The aftermarket alcohol injection controllers are fairly crude and don't have the flexibility you'd need to make it really run right across the range of RPM and load values. Tuning would probably best be accomplished on race gas first. Fill her up with some high octane stuff so you have no detonation worries and jet the pump gas fuel system. Then add plenty of alcohol across the board with the enrichment system, fill the tank with pump gas and incrementally dial back the alcohol as much as you can. The MeqaSquirt will run knock sensors and let you datalog so you could dial back the alcohol until you get a wee bit of knock then add a little back in and you're good to go.

Good luck, it's an ambitious project that a low percentage of people could pull off. Interesting that people jump all over posts like this when they don't have a clue about what's being discussed

Later, Michael

 

thanx man.... it was just an idea i was throwing around but usually when i do that something usually comes of it..... and its amazing the peoples comments when that havent the slightest clue....

 

I understand that my post count is pretty low to be posting anything in the advanced tech section, but I'm not exactly a newbie to cars, and I happened to know a little bit about alcohol... As others have stated, I'm thinking that ethanol is a much more viable choice than it's methyl cousin. Straight ethanol has an octane rating of 113, and is much closer to gasoline in specific heat than methanol, which means it will require less tuning to get it to get it to work correctly. Where your problem will lie, is getting this to work in a supplemental system like the meth/alchohol systems that the FI guys are using. With the quantity of alchohol you will have to run to quell detonation enough for reliable street driving, I think you're going to have a hard time getting the alcohol to atomize with the gasoline since you are introducing the alchohol at near atmospheric pressure.

Running E85 may be the easiest and most reliable way to get what you're looking for, but will require some tuning and quite a bit of retrofitting to make sure the alcohol doesn't eat any of the natural rubber in your fuel system. You would also have to be very careful about water since alcohol is hygroscopic, meaning that it attracts water molecules, even out of the atmosphere.

 

Frans96ss...I'd love to see some pic's of your setup....
i've been playing with the idea of going carb'd myself.

 

heres one pic ill post up more later when i get home... im still at the shop now...

 

link don't work

I think I've got a few pictures on my computer still that I took of your RR AFRs at SAM.