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Old 08-16-2010, 03:55 PM   #1
6th gear
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Subaru Stars Fuel Octane Questions

I always use Chevron 94 (I think most of us with turbos do) however, I'm heading down to California for an Indycar race this weekend.

Questions:
  1. Which stations carry decent fuel?
  2. Should I grab a couple bottles of octane boost just in case?
Tanks,
Geremy
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Old 08-16-2010, 04:03 PM   #2
Jeff54
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what mods on car?
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Old 08-16-2010, 04:13 PM   #3
minifreak
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there are chevron's all along I5 and in Cali. They just don't have 94 octane.

Flash your car to a 91 map or stay out of boost.
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Old 08-16-2010, 04:18 PM   #4
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what jeff asked. i'm reflashed to stage2 but it was an OTS map tuned for 91.. i always run 91..
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Old 08-16-2010, 04:44 PM   #5
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91 oct is good
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Old 08-16-2010, 04:53 PM   #6
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Quote:
Originally Posted by Linkseal View Post
91 oct is good
no it's really not...

if his car is tuned for 94 octane, running 91 would be less than ideal
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Old 08-16-2010, 06:18 PM   #7
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This might be inconvenient and stupid, but would putting a bottle of Octane boost before every pump work?
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Old 08-16-2010, 06:54 PM   #8
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Quote:
Originally Posted by Jeff54 View Post
what mods on car?
Bone stock

Quote:
Originally Posted by KiraFayt View Post
This might be inconvenient and stupid, but would putting a bottle of Octane boost before every pump work?
That was question #2
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Old 08-16-2010, 07:07 PM   #9
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Yeah, that's about right.

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Quote:
Originally Posted by 6th gear View Post
Which stations carry decent fuel?
None of them do. Gas in California is designed to minimize visible smog at the expense of everything else.

Quote:
Originally Posted by 6th gear View Post
Bone stock
Then just run 91, have some burritos, and call it a day!

Last edited by Necromancer; 08-16-2010 at 07:26 PM.
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Old 08-16-2010, 07:10 PM   #10
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if you're bone stock, what's the problem?
91 octane is a "premium unleaded fuel"
running 94 helps a little but if you really want the perks of running it get tuned with it.
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Old 08-16-2010, 07:32 PM   #11
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Yeah, that's about right.

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Quote:
Originally Posted by TXSubieDood View Post
if you're bone stock, what's the problem?
91 octane is a "premium unleaded fuel"
running 94 helps a little but if you really want the perks of running it get tuned with it.
In Vancouver there might be a legit reason to run 94 during the summer: It is widely available here, and 91 octane fuel is labelled as "may contain up to 10% ethanol" while 94 "contains no ethanol." Because the price difference is only a few cents per litre and E10 causes 3-4% worse fuel economy, you might almost break even. (shrug)
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Old 08-16-2010, 08:37 PM   #12
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TX is just offended because their fuel sucks compared to ours...
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Old 08-17-2010, 01:14 AM   #13
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You will be fine running 91.

I drove down to cali when my car was stock, and had no problems running cali's piss for gas 91 octane.
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Old 08-17-2010, 02:03 AM   #14
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Originally Posted by truenosan View Post
You will be fine running 91.

I drove down to cali when my car was stock, and had no problems running cali's piss for gas 91 octane.
Thanks,

That's kinda what I figured but just thought I'd run it past the VIC.

I've packed a couple of Octane Boost bottles if she protests but I don't think I'll need them.

Thanks Dudes.

Last edited by 6th gear; 08-17-2010 at 02:58 AM.
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Old 08-17-2010, 03:01 AM   #15
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If you really want to play it safe go fill up with 91 octane here, plug the battery and reset your ECU and the fuel compensation and timing table.
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Old 08-17-2010, 04:49 AM   #16
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i was having some problem with 76 gas station in WA, seems like my car doesn't really like it and giving me an ugly LV table. It's normal now with Chevron 94, weird.
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Old 08-17-2010, 10:42 AM   #17
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I drove to L.A. and back on a Rocket tune for 94, and checked with pat before I went. It's within the car's parameters to "learn" for the lower octane fuel, and you could help it out by doing a half-and-half tank of 91/94.
When you get back, ecu reset and a tank of 94, and it should take advantage of it. Really though, unless you have a very aggressive tune on, it's not even an issue.
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Old 08-17-2010, 12:15 PM   #18
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Quote:
Originally Posted by Jeff54 View Post
no it's really not...

if his car is tuned for 94 octane, running 91 would be less than ideal
Well you know I assume his car is on stock map since he did not mention any mod so...

Quote:
Originally Posted by 6th gear View Post
Bone stock
I saw few cars ran really bad on 91 Oct while they are using 93 oct map, if you are on 93+ oct stage 2, I suggest drive it gently down the US hwy. Maybe just stick with those large brand gas stations closed to Hwy exit, try to
avoid to get cheap gas from those small non-brand gas stations since they might put the conditioner on their gas and this will hurt your car.

Last edited by Linkseal; 08-17-2010 at 12:22 PM.
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Old 08-17-2010, 01:40 PM   #19
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^ conditioner in the gas is what i am guessing, there is no way the car runs so poorly with a 94 and 101 octane mix...haha...lucky i am aware and took it easy home!
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Old 08-18-2010, 02:42 PM   #20
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The octane boost does work, but if you're bone stock you won't need it unless something is horribly amiss under your bonnet.
If knock is a concern set up an alki system, you can do it on the cheap (under $750) if you're capable
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