10:1 would be a really cool setup. I remember somebody else did this (and I was going to) and the results were good.

 

i believe it was a mirage?

 

No, he went 11.0:1 or 11.5:1 (I forget which). Made some great numbers at the dyno. We kept telling him his motor wouldn't last long with that setup and sure enough...

 

with a proper tune and octane, its not a problem. Most drag cars are running way more compression with c16 and way more psi. If you go to the 8-9 turbo section, most evo guys going e85 only are running 10+ to 1

 

update:

after 80 miles (city driving) Im down to half a tank. So thats about 12-13 MPG

cold engine start ups are smooth, its when the engine is hot is when the start up is not so smooth, it will start up though.

 

sounds about normal on gas mileage.. im doing a little better now since it was retuned again.
ill be at about 140-160 miles by half tank, on highway driving and staying out of boost.. city, ill get about 120 on half tank.. been averaging 200-240 miles on a tank, and that includes plenty of boost time

 

keep in mind he is using 25% more fuel to keep the same a/f. So if you avg. 20mpg, you would get 12mpg with e85. Helps when its $0.10 cheaper than 87oct.

 

only 10 cents ? wow.. its like.. 30 cents cheaper then 87 by me..

 

$2.38 87oct
$2.28 e85

Wish it was cheaper than that

 

gas here now is ~$3.10 for 87
and E85 is ~$2.35


also for those curious about smog testing and E85.
i passed with my current setup, all i added was my cat and lowered my idle

im laughing straight to the DMV

 

Not so..... I've been running 14psi on stocks for about 8 months on te split sec. piggy back on 91 octane...... It can hold 14psi, Ive been to 17 on stocks....

 

Like I said, I've ran 17 pounds before on the stock internals... Now, do realize I have a head shim installed, head studs and I tuned it properly, I wouldnt suggest it to anyone who cant do any tuning themselves, a slight kaboom may be in order haha. Anyways, I've had the head off and all is still well with the pistons, of course I am doing internals in a month, 22psi on my evo9 turbo, should be quite interesting. I'm pushing for 400+ in the upcoming year.

 

Sorry for all my posts, but that is the correct way to go..... stay away from head shims if all possible...


ALSO FOR ANYBODY PUSHING RELETIVELY HIGH BOOST ON A STOCK LANCER... Just so you all know, I have been on 14psi for 8 months.... it will take the most toll on the rings.... they are starting to leak quite badly, burning a fair bit of oil, so be sure to do pistons AND rods at the same time, NO MATTER WHAT! I had 12,000 miles on my lancer when i turboed it, I now have about 25,000 miles on it, motor is about done, power is being lost, clutch is slipping.... Ready for the overhaul. Anyways, happy boosting everyone...

 

Your right.... Boost technically has nothing to do with it, its the horsepower that breaks a rod.... but just to make it easier for everyone to understand, about 14 is the highest you should go, and thats on a decomped motor, I wouldnt go above 12 on a stock 9.5:1 motor, your asking for trouble. Also about the post below this one, you are also correct that different setups produce different results..... but 14psi is really not that much to where the size of the turbo is going to make hat uch of a difference.... 10psi on an evo 9 turbo for instance is way below its full efficiency, as are most of the turbos custom fitted to lancers, so 14 is just a rough estimate of how high to really push this stock motor. And Im NOT tying to be a smartass here guys, really im not, Ive just had quite a bit of experience with this motor, good and bad.... One being that if your boosting even at 7psi, you will lift the head gaurenteed.... buy headstuds. anyways, Ill stop posting so much here haha, sorry everybody

 

Actually you make more power on lower compression in a boosted motor.... just saying. Anything with high boost, like drag cars, run around the 8-8.5 mark. The problem lies in fuel delivery.... Lets take 50psi for example. The amount of fuel needed to keep a correct A/F ratio is very high. With a high compression engine, there honestly isnt enough space for that much fuel.... you will hydrolock the engine with that much fuel in a 11:1 motor boosting 50psi. Also, even with C16 race fuel, the heat that would be produced from a 11:1 motor boostig that high would just melt everything..... Again, not trying to be a smartass, just trying to keep things cleared up..... yes you can run awsome numbers on a higher comp motor, just know that the lower the compression, the more boost is possible, and thus the more power can be made. OK ill stop posting now haha, havent been on evoM for like a year