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Old 06-08-2012, 09:09 PM   #1
taejin
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Default Phoenix, AZ - Need gas stations suggestions

So I recently got my Cobb AP and have been monitoring some values over the last couple weeks.

Confirmed by Bill, I was having some concerning knock issues to the point where my DAM dropped from 1 to .69 with only a couple corrections. To start, he suggested I take a look at fuel options.

I've done some research on this forum as well as a few other places on recommendations for gas stations.. but it seems to be seemingly subjective and tough to quantify the actual quality.

I've always stuck with top tier gas and tried 3 different gas stations in my area hoping for a change. There's a QT in my area that's always PACKED, so I figured they'd have good turnover on gas. I then tried Costco at the suggestion of some other people. Recently tried Chevron as well. We're probably on summer blend at this time and ethanol %'s were 10 at each of the station I filled up at.

Any suggestions based off personal experience? I'm right around Baseline/I-10, so the closer the better.

Thanks ahead of time.
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Old 06-08-2012, 09:33 PM   #2
05bluesti
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Try a shell, ive had good luck with them
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Old 06-08-2012, 09:49 PM   #3
JeromeS13
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First obvious questions, what map are you using? Any mods?
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Old 06-09-2012, 04:08 AM   #4
explosivo
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stage 1,2 protune? Whats your AFR? If your using an off the shelf map, cobb tunes those pretty rich, so you might have some false knock with something rattling around. If you have a pro tune you might just be running too much timing for this heat. you can try decreasing the timing by up to three degrees via the live tuning feature on there Ap. I only use qt, chevron, or shell, haven't had issues with any of them.
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Old 06-09-2012, 07:03 PM   #5
taejin
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thanks for the responses. yes i'm trying to distiguish between false knock (at least at the lower rpms) but im definitely knocking up high at WOT.

completely stock, flashed originally with the 91acn stock intake map and just downgraded to the 91acn stock intake lwg map. So far things are already looking much better with the lwg map. I'll try using shell, I used to hear they were good but didn't have any right next to me so I stopped going.
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Old 06-10-2012, 09:29 PM   #6
s-tizzleboost
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QT Chevron and Shell. best three gas stations. to pt them in order for me it would go Shell, Chevron, QT! i mainly use qt for the price and have always had good luck with them! shell is all time best for az IMO if you dont care abou price wise!
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Old 06-10-2012, 11:32 PM   #7
shwoop_soobie
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In a magazine collum that Eric Hsu, (the cosworth guy) writes he recommended shell, so thats what I always ran, but one time I filled up at circle k and my car seemed to run a little better, so now I just pretty much use whatever. although if I know I'm gonna be doing some spirited driving I still try and fill up with shell
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Old 06-11-2012, 12:55 AM   #8
JayWRX2004
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what version of the acn91 map were you using? 3.00 or 3.01?
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Old 06-11-2012, 08:59 AM   #9
Rabidsquirel
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Stay away from costco. I did some research, and they bid on their gas in bulk, and doesn't have to come from a top tier source. I have used QT with no problems, but then again I am still running stock.
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Old 06-12-2012, 10:53 PM   #10
taejin
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Quote:
Originally Posted by JayWRX2004 View Post
what version of the acn91 map were you using? 3.00 or 3.01?
I think 3.00, it was whatever came with the cobb ap. Hm that would make sense if theres a newer revision out there.

I just went over to the cobb website and everything seems to be 3.00 though.
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Old 06-12-2012, 10:55 PM   #11
taejin
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I'll try shell for now.. will get back here if i notice differences when i log.
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Old 06-13-2012, 03:24 PM   #12
coyotesfan
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Interesting thread... I just got Cobb ap a couple of weeks ago, have not had any knock issues that I can tell. I run shell gas, use to run Mobil 1 on my 1.8t vw that had apr 91 tuning. Just recently got an 09 sti. Love it!!! Looking forward to cooler temps for better performance.

I used to live in Michigan where 93 gas was available. Does anyone know why we can't get 93 pump gas out here?

Last edited by coyotesfan; 06-13-2012 at 03:29 PM.
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Old 06-14-2012, 05:46 PM   #13
joebud
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Quote:
Originally Posted by Rabidsquirel View Post
Stay away from costco. I did some research, and they bid on their gas in bulk, and doesn't have to come from a top tier source. I have used QT with no problems, but then again I am still running stock.
In Phoenix all gas comes into the valley through the same channel. It's not until it is put in the tanks at the gas stations do the additives go in. Shell has their Nitrogen additive and Chevron uses their Techron and QT uses their IQ additive. Because of this the additives displace actual fuel. Basically you are getting less fuel per gallon and more detergents. Costco uses only the federally mandated additives that every other station in Maricopa County must use and nothing more.
It may sound like we are 'in the tank' for Costco, I don’t care what fuel you buy, but we have done back to back testing with Costco, Shell, QT with Costco being the best to knock resistance.
Also Costco sells a lot of fuel. Costco gets fuel every single day so there's always fresh fuel in the tank. This plays a part also.
Hope this helps.
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Old 06-17-2012, 05:38 AM   #14
metallbizkit
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Quote:
Originally Posted by joebud View Post
In Phoenix all gas comes into the valley through the same channel. It's not until it is put in the tanks at the gas stations do the additives go in. Shell has their Nitrogen additive and Chevron uses their Techron and QT uses their IQ additive. Because of this the additives displace actual fuel. Basically you are getting less fuel per gallon and more detergents. Costco uses only the federally mandated additives that every other station in Maricopa County must use and nothing more.
It may sound like we are 'in the tank' for Costco, I don’t care what fuel you buy, but we have done back to back testing with Costco, Shell, QT with Costco being the best to knock resistance.
Also Costco sells a lot of fuel. Costco gets fuel every single day so there's always fresh fuel in the tank. This plays a part also.
Hope this helps.
I can agree with this in my case, I was running 91 from a specific Shell station and it was absolutely terrible. The gas turned out to be a brown color... yeah. The best guess was the tank at the station is bad... go figure because they aren't allowed to sell E85 at this station anymore because of the tank they had for it (asked the owner). Anyway I wouldn't suggest anyone buy gas from a place that doesn't sell high volume for the same reason.

For what it's worth, I have my car running E85, tuned by Goodspeed and am more than satisfied. Couldn't imagine going back to 91. Honestly, they have no reason to BS us about which 91 station to buy from.
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Old 06-17-2012, 04:35 PM   #15
Infantry209
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Anyone have any experience buying gas from Luke Air Force Base? I usually use either Shell, QT or the Luke AFB gas station. My cars have never liked costco gas, especially my AMG, which has a minimum RON rating of 95, and recommended of 98, and to me just feels like there isn't enough detergents in there to prevent knock.
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Old 06-17-2012, 10:22 PM   #16
The Erza
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Quote:
Originally Posted by Infantry209 View Post
My cars have never liked costco gas, especially my AMG, which has a minimum RON rating of 95, and recommended of 98, and to me just feels like there isn't enough detergents in there to prevent knock.
Wouldn't that be because the minimum octane rating that can be used in your AMG is 95 (recommended 98) and the highest octane gasoline costco sells is 91 here in AZ? I am not a gasoline expert by any means but I don't think the detergents they use in their gas has anything to do with knock prevention. That is the octane that prevents detonation.

Someone please correct me if I am wrong.
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Old 06-17-2012, 11:01 PM   #17
Infantry209
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Quote:
Originally Posted by The Erza View Post
Wouldn't that be because the minimum octane rating that can be used in your AMG is 95 (recommended 98) and the highest octane gasoline costco sells is 91 here in AZ? I am not a gasoline expert by any means but I don't think the detergents they use in their gas has anything to do with knock prevention. That is the octane that prevents detonation.

Someone please correct me if I am wrong.
Well you have to remember that the number recommended and minimum is RON.

When you look at the octane rating of our pumps here in the United States, it's actually:

RON + MON / 2

Which is the average of RON and MON.

Also, from what I'm researching on the web. Seems like it's the best to go with "Top Tier Gasolines" for a vehicle like mine.

Arco is not a Top Tier Gasoline, and neither is costco. But that's mostly due to the detergents?

I did do a little test when I was 16 and broke with my 98 honda civic HX, yes HX the wanna be hybrid at the time, on gasoline and which lasted the longest, i.e. arco 87 or 91, or shell 87 or 91.

Ended up that Arco would either burn faster or just short me on the gas, and I wouldn't get as much mileage as the others. The grade of the gasoline didn't matter much, as my car used 87, and didn't require 91, so no difference there. Just my .02.

Last edited by Infantry209; 06-20-2012 at 02:19 AM.
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Old 06-18-2012, 05:50 PM   #18
Rabidsquirel
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I think I am more confused about where to get gas now. I was getting it from costco, but then thought it couldn't be considered top tier from what I read, so then I just only used QT (corner of Lindsey and Baseline)... GRanted I am still running stock, but I have all intentions of getting a Cobb AP within the next year, so are we just that screwed on gas that only option is to get protuned?
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Old 06-18-2012, 11:01 PM   #19
lilorsini
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I always use Shell or Chevron, I got a bad batch of QT and my WRX ran pretty crappy for that tank
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Old 06-19-2012, 12:06 PM   #20
disturbed-az
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taejin....

I am running a perrin stage 1 map - here in arizona as well - having some issues with knock as well. Maybe we can chat offline / email about this and compare some things. I'd love to see your timing and compare with what I'm running...seems we're in the same boat. Feel free to send me a PM and I'll give you my email address or something...
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Old 06-19-2012, 10:44 PM   #21
ICKEY
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I'm in Prescott, use cobb ap stage 1 w sf, soon stage 2. Have been using mainly Costco fuel. Do lots of logging and I see way too much knock on regular acn91 map, lwg map shows less knock but the performance sucks rotten eggs. My AFR is usually right on. I have to believe the fuel has alot to do with less than desired performance. Its sad cause I know my car wants to do so much more, so much better. I will try top tier fuel and log. What about a pro tune, can they tune out the knock on this crappy fuel? It would seem to me, if that can be done then problem solved.
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Old 06-24-2012, 02:12 PM   #22
oslice
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Default Sinclair

Just curious has anyone tried Sinclair fuel?
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