For all of you out there that get the chance to have the higher octane gas, which do you prefere? I'm down to a half tank now, and will need a fillup soon, so which do you recomend. Shell V-Power, or Sunoco 94. This is for the 2.0 SC.

 

Anything over 93 would be good,I use Ultra 94 Sunoco.

 

sunoco

 

V Power...Shell is a top tier fuel supplier.

 

i use nothing but Sunoco 94 in my babe.

 

I'd say they're both about the same.... I use Shell most of the time as they don't carry Sonoco 94 around here...

 

Why would you waste your money on 94? The SS is designed to run on 91. 93 octane is plenty

 

I don't under stand your issue you say not to buy 94 octane, but then you say 93 is plenty like its a better option, while V-Power is 91. which is it?

I use nothing but ultra 94, if I can help it.
I don't notice much differance in performance but I know it provides a cleaner and complete burn. better for the car and the envirmoment

 

We can't get Sunoco out here.

 

same here

 

94 won't give you more horsepower. I hope you understand that. I only run 93 in the SRT-10 because we don't have 91. It's 87, 89, 93 octane

How much does 94 octane run you anyway?

 

i run chevron 93 octane and Vpower 93 octane. that's the highest we got. they put 87 octane in the car when i bought it, the thing ran like **** until i put higher octane in it.

 

Sunoco 94 arounds here is running between 2.50 and 2.55 / Gallon. Which i wont complain about at all because i run my car quite a bit. And i was just paying 3.30 for 93 like a month ago...

 

Has anybody here bothered to read the SS/SC manual, because it says to use 91 octane fuel. That is the recommendation from GM engineers. You know, the people who acually designed your car.

It also says that you can fill up with 89 if you have to. For the SS/SC, the ECU can tune itself to run 91->89, so there is little use in using 93 or 94. I don't see why we have this conversation once a month. It's a non-issue.

Of course, you won't break anything running 94. But they way I understand it, the CPU can only tune itself for 91 at the highest.

 

BTW, I run 91.

 

I'm not a gib fan of getting knock, or anything close to knock. I've had a few friends that have blown up motors... And thats not for me. I understand the computer changes the timing and whatnot to prevent it, but i look at it as this, its a supercharged engine, running a somewhat high compression. And the motor runs fairly hot. I use it just because its cleaner, and a lil more of a saftey precaution.

 

Actually the manual recommends using 91 octane or above and does not say anything about the computer tuning itself to a specific octane. My guess is when the computer detects pre-detonation (knock) engine timing is retarded to try and stop it. Running >91 octane probably further reduces the chance of pre-detonation and that is a good thing.

Also, the manual states that you can use as low as 87 octane with reduced performance as a trade off (due to the above mentioned condition).

Directly from the manual posted on the GM SPO website:

"If your vehicle has the 2.4L L4 engine (VIN Code B) or the 2.0L Supercharged engine (VIN Code P), use premium unleaded gasoline with a posted octane rating of 91 or higher. You may also use regular unleaded gasoline rated at 87 octane or higher, but your vehicle's acceleration may be slightly reduced, and you may notice a slight audible knocking noise, commonly referred to as spark knock. If the octane is less than 87, you may notice a heavy knocking noise when you drive. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. Otherwise, you might damage your engine. If you are using gasoline rated at 87 octane or higher and you hear heavy knocking, your engine needs service."

Again I use Shell V Power due to its rating by GM as a recommended top tier fuel.

 

That's why they have a thing called "Knock Sensors" that will pull timing so your motor doesn't blow up.

 

lol u all talk about cleaner burn lol i mean yea it might burn better but msd with a timing firing will burn much cleaner good think to look into buying for the cobalt better ignition

 

Sunoco!!! I don't use 94 though i use 93. One octane is like 30 cents more here. Screw that. But yeah, isn't Sunoco the official gas of Nascar?

 

Nah 76 is.

 

76, i havent seen a 76 in years.

 

Knock sensors won't save a motor. They just tell you your screwed. Yes the PCM will help retart timing to save your motor, but there are tons of guys who have blown up their engine, even with knock sensors.

If it was me, I'd run the highes octane I could. Unless your not getting any KR. But the higher octane can help add timing. I remember a scan a while back with a 3" pulley (or smaller) and he had KR. So if your running a small pulley, run the good stuff. And if your to cheap to run the good stuff, you deserve to blow up your engine.

 

Why should he use 94? He's not getting knock even with 91 octane.

 

Sunoco took over NASCAR almost 2 years ago.