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Old 11-27-2007, 01:04 AM   #1
wrb2006sti
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Default cobb stage 2 93 octane in A/C/N question

I have an 06 sti stage 2 with catted DP. I live in nevada so i fall under the acn map for cobb with our crappy gas. I always put 4 gallons of 100 octane with 10 gals 91 chevron. I have used the stage 2 regular for 91 octane with no troubles. Today i filled 4 gals 100 with 10 gals 91 then put the realtime 93 octane stage 2. Its running fine with no pings so as long as it doesnt ping am i fine running the 93 stage 2 with my 4 gals 100? or is there some other issue to look for? its now 40 to 60 degrees in las vegas so i thought if it was ok to run this for the winter then i will run the 91 when we get to 100 this summer. I caled cobb and they said they made the 93 map with a pure 93 good mid west east coast gas. He said u can try it but its at your own risk so if anyone can enlighten me is pinging the only thing that would cause my engine damage? i have a boost guage and it doesnt seem to be boosting any different than the 91 reg map. Thanks for reading
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Old 11-27-2007, 02:36 AM   #2
a6n6d6y
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I'm pretty sure the ecu will pull timing if "hears knock" on that car...you should be fine
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Old 11-27-2007, 11:16 AM   #3
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you should run a map 1oct lower than what you put in your tank... and there is no real power to be gained by using a higher OCT ots map, at least measured by your butt dyno.

i would say run the 91oct map and put in 92 or higher if you got it. just to make sure your engine is protected from a bad tank of gas.
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Old 11-27-2007, 08:43 PM   #4
wrb2006sti
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thanks it seems to be running fine and the power seems more linier i just did the realtime not the full reflash i wonder if that would make any difference either.
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Old 12-03-2007, 01:32 AM   #5
wrb2006sti
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im just running the safest tune for the crappy nevada gas but it ran great on the 93 octane stage 2 with just a 4 gal 100 to 10 gal 91 mix any way thanks for the info
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Old 12-03-2007, 02:59 AM   #6
a6n6d6y
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Quote:
Originally Posted by wrb2006sti View Post
thanks it seems to be running fine and the power seems more linier i just did the realtime not the full reflash i wonder if that would make any difference either.
IIRC the base parameters are the same
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Old 12-21-2007, 10:57 AM   #7
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So would I be safe running the ots stg 2 91 oct map if I were to mix a 1/2 tank of 100 oct with crappy california 91 oct gas?
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Old 12-22-2007, 11:30 PM   #8
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Quote:
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So would I be safe running the ots stg 2 91 oct map if I were to mix a 1/2 tank of 100 oct with crappy california 91 oct gas?
you should still be using the ACN map.
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Old 12-23-2007, 01:22 AM   #9
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Quote:
Originally Posted by KevinG View Post
you should still be using the ACN map.
I disagree, if he runs 1/2 100 octane and 1/2 91 octane ALL THE TIME he should be fine not only running the regular 91 octane map, but also the 93 octane map. You can feel the difference between the 91 and 93 maps (you can even feel the difference when running 91 vs. 93 on the stock ECU).

Knock is the only thing you will need to watch out for.
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Old 12-23-2007, 10:33 AM   #10
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Quote:
Originally Posted by pyrex View Post
I disagree, if he runs 1/2 100 octane and 1/2 91 octane ALL THE TIME he should be fine not only running the regular 91 octane map, but also the 93 octane map. You can feel the difference between the 91 and 93 maps (you can even feel the difference when running 91 vs. 93 on the stock ECU).

Knock is the only thing you will need to watch out for.
the reason i say he should be running a acn map is for the rear case when he cant get 100oct... unless you drive around with a poop ton of it in the trunk... and i think your butt dyno is very senitive or it needs to be recalibrated, there is no way that you can feel 5-10whp let alone 5-10chp.

it is just like the guys running a cbe and swear they can feel the difference.
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Old 12-23-2007, 12:31 PM   #11
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Quote:
Originally Posted by KevinG View Post
the reason i say he should be running a acn map is for the rear case when he cant get 100oct... unless you drive around with a poop ton of it in the trunk... and i think your butt dyno is very senitive or it needs to be recalibrated, there is no way that you can feel 5-10whp let alone 5-10chp.

it is just like the guys running a cbe and swear they can feel the difference.

Stock STis knock on 91. The AP makes this a little better, but they still knock on 91. You can definitely feel when the ECU pulls timing due to knock. On 93+ they don't knock, power delivery is noticeably smoother and the cars pulls harder.

I agree with you that he might not always be able to find 100 octane to mix with but the OP said that he was running the real time 93 map. As long as he is running the 91ACN base map if he can't find 93 or hears knock he can reset the ECU and be back to the 91ACN map even if he doesn't have his AP with him.

Last edited by pyrex; 12-23-2007 at 12:38 PM.
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Old 12-26-2007, 01:11 PM   #12
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Quote:
Originally Posted by pyrex View Post
I disagree, if he runs 1/2 100 octane and 1/2 91 octane ALL THE TIME he should be fine not only running the regular 91 octane map, but also the 93 octane map. You can feel the difference between the 91 and 93 maps (you can even feel the difference when running 91 vs. 93 on the stock ECU).

Knock is the only thing you will need to watch out for.
I wasn't planning on running it all the time, just once in a while. I should still be fine on the 91 oct map correct?
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