I just got my Cobb Accessport for my WRX, I want to run the stage 2 map but need to find some 93 octane somewhere in Denver, does anyone know any gas stations that sell 93?

I don't know exactly what it is, but the Shell gas station on Green Mountain just north of Sonic has some kind of nice fuel. I think Dave and Nissan Dave refer to it as racing fuel. Text Dave about it, he will give you better specifics than I can.

I suggest just running 100 in it. That's what I do on my stage 2, 93 map. I love the 104 octane in it, I wish my access port was tuned for that octane!

Running more octane than you're tuned for isn't going to help your performance, in fact it can hurt it. You always run the lowest octane you can get away with, so if your new map is for 93 octane then try and get 93.

I wish they sold 93 up here, looks like every State soon is going to 91...sheesh. When I lived in Pennsylvania premo was 94, and some places had 96.

Englewood self serve is the only one that I know of. 3204 S Broadway, Englewood, CO, United States or search for broadway and eastman on google maps.

Its not really 93 octane from what I've heard its 91 mixed with a small percentage of alcohol... My car feels strong when I run it?

you can get 103 at a special place here in cheyenne...

I have no need for 103, the map on my AP is set for 93....running 10 octane points higher could cause problems like chickenwafer said. Cobb suggests adding a octane booster if you cant find higher octane gas in your area, i always stayed away from these though.

Your map is for 93 octane, but for what elevation? Octane requirements decrease as altitude increases. That's why regular gas here in Denver is 85 octane and is 87 octane just about everywhere else- and it seems like the other grades also take that 2 octane point hit here in Denver.

MazdaTom wrote:Your map is for 93 octane, but for what elevation? Octane requirements decrease as altitude increases. That's why regular gas here in Denver is 85 octane and is 87 octane just about everywhere else- and it seems like the other grades also take that 2 octane point hit here in Denver.

Well I know this map is not made specifically for high altitude as i just downloaded it from Cobb. So youre saying 91 at high altitude is comparable to 93 at sea-level?

I don't want to say it is DIRECTLY comparable, but the trend is that as altitude increases, octane requirements decrease. I probably wouldn't drive out of my way to get gas at a 93 octane station if 91 is more convienient.

Bingo. I've always heard that the reason higher octane isn't sold at the pumps here is because of the elevation. The theory goes that since the air is thinner up here, fuel is more resistant to combustion. Higher octane = higher combustion resistance, so it evens out. I don't know about your setup...but my FD was tuned for 93 octane at sea level, and I've always run 91 in it up here with no problems as far as that goes. However, you should really get a tune for altitude...I plan on doing that myself ASAP. A base map from the manufacturer will work, but a good tune will make it run so much better.

Edit: Just saw this was for a WRX. As you probably know, there is a HUGE tuner scene for Subarus up here. Give Suba Performance a call, heard good things about them from friends who own WRXs / STis.

http://www.subaperformance.com/

Octane booster worked for my Saabs when I had to use it.

Maybe Cobb could help you? I'd think 91 here would do it.

TheNewBlack wrote:I have no need for 103, the map on my AP is set for 93....running 10 octane points higher could cause problems like chickenwafer said. Cobb suggests adding a octane booster if you cant find higher octane gas in your area, i always stayed away from these though.

Good post Chickenwafer, you ninja'd me on the reply.

As a general rule, if you want the most horsepower, run the lowest octane you can, so long as you don't experience pre-det. If you're adding more octane, just to add it, or because the big numbers sound impressive, or even because your manual suggests it, you're essentially eliminating the combustible fuel in trade. And when you start taking out one of the key explosive ingredients in the cocktail.... well... you get the idea.

Cool. Thanks everyone for your input, im thinking of getting the AP pro tuned at Flatirons Tuning (they were one of the few colorado Cobb approved tuners) sometime next week, Ill talk to them more about it and let you all know what they say. Thanks again!

good question Randy, and lots of good info that followed! I'm gunna say thanks for all the input from everyone