100 octane = slow STi???
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Originally Posted by kickslop
Have you given the ECU a chance to add timing? Stop resetting it.
That's the only thing in the stock ECU you will seen gains from by only increasing octane, and if your timing advance was fine at your boost levels already, you're not going to see jack and will likely see a loss of power. Higher octane fuels burn slower. If you're not starting combustion earlier (through ignition advance, which you have zero control over right now), you have effectively just worsened your combustion events.
No Subaru is "tuned to" a particular octane.
That's the only thing in the stock ECU you will seen gains from by only increasing octane, and if your timing advance was fine at your boost levels already, you're not going to see jack and will likely see a loss of power. Higher octane fuels burn slower. If you're not starting combustion earlier (through ignition advance, which you have zero control over right now), you have effectively just worsened your combustion events.
No Subaru is "tuned to" a particular octane.
I'm Slow
Joined: Aug 2003
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Originally Posted by kickslop
Have you given the ECU a chance to add timing? Stop resetting it.
That's the only thing in the stock ECU you will seen gains from by only increasing octane, and if your timing advance was fine at your boost levels already, you're not going to see jack and will likely see a loss of power. Higher octane fuels burn slower. If you're not starting combustion earlier (through ignition advance, which you have zero control over right now), you have effectively just worsened your combustion events.
No Subaru is "tuned to" a particular octane.
That's the only thing in the stock ECU you will seen gains from by only increasing octane, and if your timing advance was fine at your boost levels already, you're not going to see jack and will likely see a loss of power. Higher octane fuels burn slower. If you're not starting combustion earlier (through ignition advance, which you have zero control over right now), you have effectively just worsened your combustion events.
No Subaru is "tuned to" a particular octane.
Also, I too would like to know what made you fill the entire tank and spend $74 on race gas when you do not have EM
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...in da hause!!!
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Actually, my roommate bought the gasoline...I paid nothing 
CEL is for the O2 sensor, I've been lazy and haven't gotten a fix for it yet.
You guys say 100 octane will make the car slower? It sure as hell made my father's WRX faster...
CEL is for the O2 sensor, I've been lazy and haven't gotten a fix for it yet.
You guys say 100 octane will make the car slower? It sure as hell made my father's WRX faster...
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Originally Posted by Balboa
Actually, my roommate bought the gasoline...I paid nothing
CEL is for the O2 sensor, I've been lazy and haven't gotten a fix for it yet.
You guys say 100 octane will make the car slower? It sure as hell made my father's WRX faster...
CEL is for the O2 sensor, I've been lazy and haven't gotten a fix for it yet.
You guys say 100 octane will make the car slower? It sure as hell made my father's WRX faster...
could be because your o2 is all messed up and alo because you reset your ecu. you should never reset it. make a few hard runs with the 100 octane and you should notice a difference.
wait, you dont have any EM?
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Originally Posted by 04evo2
i know of a sunoco on dale mabry, but its like $5 a gallon.
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Got Boost?
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the higher octane actually only helps if you are pushing more than normal boost, or higher compression. It really helps prevent knocking and such and burns better. But if the ecu reads different fuel or such it will pull timing alot. I was going to put some in the subby and in the bike, but neither are really needed.
