SonicVQ

I don't think this is correct. My dealer told me the S has more power and that is why it cost more.

(Just joking and trying to be funny. Did it work?)

4DRZ

iTrader: (7)

It really depends on how many stickers were on the car when you bought it used. I heard each sticker adds 50-75 HP depending on the size, color, and location.

SupraOfDoom

We have 93 at every station in Milwaukee as far as I can tell. Plenty with E85 too.

4DRZ

iTrader: (7)

No fair! Maybe it is just a thing in the valley and Green Bay.

Rochester

iTrader: (9)

93 is everywhere here. I've never seen a station that didn't offer 93. Whereas 91 is 50:50, same for E85. I get put out when forced to pump 93 because 91 isn't available. How strange the way it's different region to region.

Do you have a 91 map, or are you tuned for 93 exclusively?

SupraOfDoom

Here is a little handy site for finding 93. You can see the further away from Milwaukee you get the worse it gets lol.
https://find93.com/

Epiphany

Then when you get into higher altitudes, you don't see the higher octanes much. I'm at 3500 feet above sea level and you don't usually see anything above 91 here, 87, 89 and 91. Also don't think we really have any stations with E85 since it's not subsidized here, most of our gas is 5%-10% ethanol.

RobC7

93 is available everywhere in the Chicagoland area, lowest prices by me are $1.39 for regular and $1.79 for premium.

Rochester

iTrader: (9)

So the common factor in all this is altitude? Seriously? That's fascinating.

I wonder what it's like in Boulder?

SonicVQ

Think about it like this. Higher elevation (lower air density) has the same effect as lowering the engine's compression ratio.
The lower combustion pressure reduces the octane requirement and also reduces engine power.

As a general rule, a naturally aspirated combustion engine will lose 3% of its power for every 1,000 ft of elevation gain.

Rochester

iTrader: (9)

Air density and compression... yes.

3% for every 1000 feet... that would mean our 330 hp engine would be 283 peak HP near Mile High Stadium. Ouch!

330 * 0.97 * 0.97 * 0.97 * 0.97 * 0.97 = 283

You know what? Twice in as many days some newbie has written that they bought a "chip" for the G. This is an awkward trend on the forum.

4DRZ

iTrader: (7)

I have both maps, but the 93 map is a lot more fun.

I really like that site and I added one of the only 3 sites in Appleton to it when Meijer opened up by our house. I also have to use that site when I am at Road America in Elkhart Lake. I have to drive all the way into the Plymouth PDQ to find 91 octane. It can become a long drive because it is easy to almost run out of fuel on track sometimes when you are having fun.

We are not at a very high altitude in WI and it is a rather recent change here. We used to have 93 octane everywhere. Not sure why it dried up all of a sudden.

Epiphany

Yeah, in the car scene here it's common knowledge that turbos punch above their weight since NA engines lose 10% right off the top. My 2.0T Genesis coupe with 275 ft/lb had what felt like never ending torque compared to the G. Helps that it made peak torque at 2000rpm too, though. A lot of cars that require premium fuel here run perfectly fine on mid grade due to the altitude.

SonicVQ

Speaking of air density and turbos....
Every car magazine will adjust the acceleration times and trap speed to a "standard atmosphere":

• Car and Driver corrects to air pressure of 29.93 inches of mercury (1013 mBar), at 60F (15C) and ZERO percent humidity. This is also known as the SAE J607 correction factor.
(https://www.caranddriver.com/feature...g-for-weather/)

• Motor Trend uses the other (and newer standard) where it corrects to 29.23 inches of mercury (990 mBar), at 77 F (25C) and ZERO percent humidity.. This is also known as the SAE J1349 correction factor. (https://www.motortrend.com/news/motor-trend-testing/)

The SAE J607 correction gives about a 4% better number verses J1349, which is why most dynos are corrected to the SAE 607 standard, aka "STD"
The J1349 is considered more accurate, as it factors in engine friction, where the J607 doesn't.

All normally aspirated engines get the full correction factor, and any forced induction engine get 50%.

Below we can see the FULL correction factor was applied to this G37X test result.
SP: Speed correction factor. Measured trap speed is increased by a factor of 1.022
ET: Elapsed time correction factor. Measured quarter mile time decreased by a factor of 0.979
LIN: To be honest, I don't know where this is used

Any forced induction engine will receive HALF of the correction factors (as shown in the CF section)


I hope this post wasn't too long or boring.

doctorg37xs

Sorry, maybe "punch" was the wrong word to use. I'm talking about the character of the car; the "feel" of the ride after a tune having more of an impact on the AWD vs the S model if that makes any sense.