100 octane = slow STi???

[DubtecV2]

Filled up my STi with 100 octane yesterday (fucking $74 :whoa: ) to see what it'd do in case I decide to go to the drags again....

What's even worse is I took a friend that's interested in trading in his MS Protegé for an STi for a ride. Felt so embarrassed because even after resetting the computer three times, it still feels slower that it normally does with plain-jane 93 octane.

Filled up my father's WRX with 100 and felt a very large difference, but not the case with the STi. Any input???

[fadedSTi]

Filled up my STi with 100 octane yesterday (fucking $74 :whoa: ) to see what it'd do in case I decide to go to the drags again....

What's even worse is I took a friend that's interested in trading in his MS Protegé for an STi for a ride. Felt so embarrassed because even after resetting the computer three times, it still feels slower that it normally does with plain-jane 93 octane.

Filled up my father's WRX with 100 and felt a very large difference, but not the case with the STi. Any input???


shouldnt reset your ecu. what type of ecu is your father running. nomally you have to be tune to run 100. i just had mine done for it ;-)

[DubtecV2]

His WRX is basically stock, gutted uppipe / 3" downpipe. I mainly reset it because the damn CEL :doh:

Yeah, I figured the STi was tuned to run on 93 from the fastory and 100 octane won't work so well with a stock tune...

[Skittle]

If your car is stock,you wont see a difference...it will actually make the car slower :wink:...

[blackwagon]

and you needed a full tank why?

[fadedSTi]

His WRX is basically stock, gutted uppipe / 3" downpipe. I mainly reset it because the damn CEL :doh:

Yeah, I figured the STi was tuned to run on 93 from the fastory and 100 octane won't work so well with a stock tune...

keep getting a CEL? are you having that checked?

[fadedSTi]

Filled up my STi with 100 octane yesterday (fucking $74 :whoa: ) to see what it'd do in case I decide to go to the drags again....

What's even worse is I took a friend that's interested in trading in his MS Protegé for an STi for a ride. Felt so embarrassed because even after resetting the computer three times, it still feels slower that it normally does with plain-jane 93 octane.

Filled up my father's WRX with 100 and felt a very large difference, but not the case with the STi. Any input???


where did you get the 100 octane at? im looking to put some in mine ;-)

[JonLGT]

and you needed a full tank why?

Plus eight-hundred-billion.

[04evo2]

where did you get the 100 octane at? im looking to put some in mine ;-)
i know of a sunoco on dale mabry, but its like $5 a gallon.

[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.

[fadedSTi]

i know of a sunoco on dale mabry, but its like $5 a gallon.


thats where i think im going to go

[fadedSTi]

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.

i was also thinking that. my tuner said to make 6 hard runs with the 100 octane to let the ecu learn it

[I'm Slow]

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.

+1 pretty much sums it up!

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:?

[DubtecV2]

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...

[fadedSTi]

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...


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?

[spencerxi]

dumb

[Alpha]

i know of a sunoco on dale mabry, but its like $5 a gallon.

Just for reference it's $6.00/gallon now.

[fadedSTi]

dumb


whats this about?

[fadedSTi]

Just for reference it's $6.00/gallon now.


thanks for the heads up. im going to get 5 gallons or so

[subbykid]

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.

[Alberto411]

Try this: http://forums.nasioc.com/forums/showthread.php?t=302047

Shiv from Vishnu Tuning illustrates a little trick on getting your ECU to learn whats going on quickly. I'm not 100% if this is for your specific application, but perhaps worth a shot. Oh, and I'm not responsibile for anything bad that happens because of this, but that won't happen, will it? :)

-AL-

[DubtecV2]

I always reset my ECU like that...when I want performance anyway.

[Alberto411]

I always reset my ECU like that...when I want performance anyway.

das cool... wasn't sure if many people did that.

-AL-