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Old 02-12-2012, 02:59 PM   #1
Scooby Newbie
Member#: 232507
Join Date: Dec 2009
Chapter/Region: E. Canada
2012 WRX STI
Ice Silver

Default Safety benefit of non aggressive 91 octane map vs stock tune?

I will be taking delivery of a 2012 STi in the coming weeks and was looking for some opinions on aftermarket tuning. From everything I have read in the last few years, it seems the general consensus is that factory turbo subaru tunes are less then ideal. I live in Canada (northwestern Ontario) and have limited access to decent fuel. 91 octane blended with 10% ethanol is the best i can manage (likely not super fresh either as its a small town haha).

So my question is, would purchasing an AccessPort and swapping to a basic 91 octane map (perrin stage 1 tune, OTS 91 cobb map, or other e-tune) be a reasonable step to reduce the likely hood of knock, considering the low grade fuel and less then perfect factory tune?

I understand this action could void my warranty, but at the same time i don't see the point in owning this car if i can't have some fun with it/ constantly be terrified of popping a ring land or spinning a rod bearing from recurrent detonation.


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Old 02-12-2012, 05:43 PM   #2
Scooby Guru
Member#: 171948
Join Date: Feb 2008
Chapter/Region: Tri-State
Location: new york
08 wrx vf52 swap
best et,12.6@108.7


torqued performance maps. end of story. you can run 91 or 93 octane. ive runs erics maps for over 2 years with zero problems.
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Old 02-12-2012, 06:22 PM   #3
Scooby Newbie
Member#: 232507
Join Date: Dec 2009
Chapter/Region: E. Canada
2012 WRX STI
Ice Silver


I do keep seeing his work mentioned with positive results, will certainly keep him in mind.

Can anyone comment on how terrible the stock tune actually is, a log or something? That was going to be my first step in March, use the access port to log the stock tune on the gas I have to work with and see how scary things actually are.
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Old 02-13-2012, 11:43 AM   #4
Cobb Tuning
Member#: 4803
Join Date: Mar 2001
Location: Austin, DFW, Portland, SOCAL

What many people refer to when saying the "bad" stock tune is the A/F curve while the car is building boost. In the graph below, you can see the leaner A/F ratio is held longer until it drops to a more rich turbo friendly area.


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Old 02-13-2012, 09:08 PM   #5
Scooby Newbie
Member#: 267463
Join Date: Dec 2010

i saw a dyno graph of the new brz.. it had the same dip in torque and hp from the 3200 - 4500rpm range. Really??? Everytime someone explains it i hear "its for emissions".
Is this because there are specific rules around full throttle afr's up to 4500rpm, or something? then after that they can do whatever they like?
just curious.
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