Originally Posted by KevinD

sense i have first hand experience using a 5th injector injecting E-85, yes i know it works. it will also work with meth if your lines are alcohol compatable. although it sounds like fun, i think you are just reinventing the wheel. no system is going to be as reliable as the stock system. even if you use all OEM parts, your wiring may not be to par, the mount of the injector might fail... etc etc. point is, if you are planning on running a second fueling system to run higher boost, you are going to want some kind of fail safe.


the 5th injector we used on our race car took its fuel from the fuel rail so it used the same pump the primary injectors used. it even used the same fuel (it was a turbo E85 car with 5 injectors). the 5th injector was a staged injector but it was pulsed. its pulsewidth was incremental with the boost pressure and triggered with the crank position. all of this was done in the ECU for the car. your setup is going to be similiar, instead of running off the rail your getting a second pump, and a second gas tank and running a second fuel. all of which adds to the complexity, and thus reduces the reliability. i would highly recommend a failsafe even for the system your developping.

good luck though, and let us know how it works.

Originally Posted by 94AWDcoupe

I am aware of all the calculations. But they dont mean much to me. Practical on car experience is what I am after. The cooling abilities is only a small part of the equation. It may only take injecting an additional 100cc of ethanol to equal the cooling properties of methanol. Then there is more heat energy per unit for a given amount of ethanol. Then there is detonation resistance. Who fares better there? F1 converted from meth to eth with no reported power losses. Top tuners in the drag scene say eth and meth are very near the same potential with meth getting the win by a few percent not 13%. Then there is the article of the high altitude planes that ran well on eth and meth but not isopropl. Again no real reports of ethanol injection the way I plan to try it. If you know someone who has done it this way please post a link.

My bet is the accuracy of injecting with injectors and the reliability will lead to far more potential then that of meth setups.

Originally Posted by 94AWDcoupe

If you ran 93 and your 5th injector was e85 then it would be the similiar. Your example doesn't have much relevance unless you post TB temps due to the 5th injector.

I cant run e85 here. We dont have it. It is a 2 hour drive one way to fetch the e99. Otherwise I would just be running e85 through 4 injectors.

Originally Posted by 94AWDcoupe

Richard stated his parts were not compatible with gasoline. Maybe he can chime in here. But regaurdless of that answer the sureflow pumps are not reliable on meth, changing to ethanol isn't going to change the reliability level.

My point to this is all alky kits on the market need a failsafe because they are no where near as reliable as your factory fuel system. You cant build second factory like system and inject meth. But you can inject ethanol this way.

Since no one I know has tried this I am going to give it a shot. The question I want answered that no one seems to be able to answer is if you inject ethanol at same quantities as meth (20% of total fuel) will it perform as well as methanol?