i can get 120 octane fuel i was wondering if that is safe to run in our cars i have a ss/sc with an intake, catback exhaust and stage 1.

 

If it is leaded HELL no! If it is unleaded what all does it have in it.

 

There would be no need to in your case...

 

There is no need to run some super high octane fuel in your car unless you are in a race car. It's a common misconception that higher octane instantly means more horsepower, it doesn't. It all depends on tuning, timing, and all of that good stuff on which octane you run. I wouldn't personally run anything over 93 unless you are tuned for it otherwise you might get premature or even late detonation depending on your timing and such.

In short, no. Don't run it.

 

I ran 100 otc and I could tell a HUGE difference and I am stock. More performance and gas millage. But yes 120 otc is overkill.

 

damn that sucks i wanted to try it and it is $8.50 a gallon

 

Did you have a wideband or interceptor or anything like that? I would have been real interested in seeing how the instrumentation reads that. 100 octane on a SS/SC isn't anything like 120 though.

 

unfortunately I had no instruments. You could just feel the difference in the way it pulled and I received a little higher boost. I would really like to see if there was any HP increase. VP Racings site said it will net a 15% increase in HP.

 

DO NOT USE THE 120! I belive 108 is the HIGHEST UNLEADED you can go. Anything higher than that I belive is leaded which means clogged cat, o2 sensor, and possibly some other damage....I run 100 daily but I also have hptuners....I can tell you, going from 93 to 100 and tuning it....WOW like seriously night and day. My car is so much faster than it is with just 93...but my car has problems....it's emo....and doesn't like me. My car (kerri) says I abuse her too much. Boy is she in for a surprise soon

Actually, I think I may have seen 110 unleaded somewhere.....but 120 is definately not unleaded

 

id add like a gallon or 2 to a full tank

 

WHAT! I wouldn't touch that stuff. I don't think any one on here could benefit from that stuff, there is just know need. There are other additives that are allot safer.

 

The thing is with the higher octane gas is that if you aren't tuned for it you aren't seeing much gains. Sure maybe a little but if you were tuned for it you could run more timing and get more power.

Leaded gas is a big no no! Just don't do it, even if it's a gallon or two.

 

like he said but i wanted to throw this in to. the higher the octane the harder it is to burn. thus this is why higher comperrsion cars run 93+ so they dont have detonation problems. there would be no need to run that high of octane in your car, i'd say 94 at the most.

 

I always run Shell 93 Octane And it is only like 2.69 a gallon.

 

same here but there is one shell station in town that sell's 94 =), not a huge difference, just reduces engine noise alittle

 

I usually run 94 and I can tell a slight difference from 93 guessing pcm is letting me have better spark advance, I really want HPtuners so I can run 100 on the weekends and 94 during the week..

 

there would be no gain running fuel with that high of an octane rating in your car. you would just be emptying your pockets.

 

all in one shot!


waste of money. big time. don't do it. let the ricers ADD time to their 1/4 mile and think they ran faster using 120.



[QUOTE=RBC;930668]unfortunately I had no instruments. You could just feel the difference in the way it pulled and I received a little higher boost. I would really like to see if there was any HP increase. VP Racings site said it will net a 15% increase in HP.[/QUOTE]

they say that so that you will buy it. just like companies have "proven" that intakes give you 20 whp.


you're not really seeing ANY more power if you're not tuned for it. any gains are most likely in your head. this is a super, super common topic.

guys, please learn what octane is, what it means, and how it affects your fuel. octane is NOTHING more than the resistance to detonation. higher octane, harder to burn. harder to burn = not using the full potential of the fuel. not using the full potential of the fuel = LOSS of performance. gains are in hour head. unless you're tuned for it, you're wasting your money.

 

why? In my t-type I run vp c16, I think its around 114 octane and its perfect. BUT i'm able to get 25# of boost out of it, and a good amount of timming with no knock. If your getting that kind of boost then its ok, but 120 is more octane than you need. thats all out race motor stuff. If i remember right c43 (name of fuel from vp, I could very possibly be wrong) is 120 octane which is made for big nitrous applications. which if you have a 12:1 compression 800 hp engine and want to put 500 hp worth of juice on it then thats what you want. its not what your little tame cobalt needs.

I'm not encouraging any of you try this but you can run small amounts of leaded fuel. the cat will clog and the o2 will fail, but its pretty amazing how long they will last. you could get 2 years out of a cat on occasional leaded fuel mixed with unleaded. the o2's, especially heated o2's do pretty well with lead. I used to go through 2-3 o2's a season running that c16, I would go through about 5 gallons a week.