car responds better to 100+ octane?
09-13-2009, 06:29 PM
#1
4th Gear Member
Thread Starter
Join Date: Mar 2009
Location: NC
Posts: 1,909
car responds better to 100+ octane?
Myth or what? I just (in the name of science) filled my empty tank with 100+ octane (5.99/gallon 
) to see if my car would react/run any better then regular 93 octane.
Now, don't get me wrong, I don't see how 7 octane would make any difference in performance (I'm not saying putting race gas in my car give me extra 30 HPZZZ LOLZZ), but with all my mods (esp. the cams) do you think that the higher octane helps the cams out any w/ power? I THINK I felt a difference in TQ, but I'm not positive. The car seemed to pull a tiny bit harder when I was on it.
Am I crazy?
) to see if my car would react/run any better then regular 93 octane. Now, don't get me wrong, I don't see how 7 octane would make any difference in performance (I'm not saying putting race gas in my car give me extra 30 HPZZZ LOLZZ), but with all my mods (esp. the cams) do you think that the higher octane helps the cams out any w/ power? I THINK I felt a difference in TQ, but I'm not positive. The car seemed to pull a tiny bit harder when I was on it.
Am I crazy?
09-13-2009, 07:09 PM
#2
aka 'Negative Nancy'
Join Date: Jul 2007
Location: Ohio
Posts: 4,839
unless the car is tuned for 100 octane, it wont perform better...it will probably perform worse, you only need to run the minimum octane you can run without detonating...thats why i think people are dumb when they have a stock car that calls for 87 and they put 94 in it because its "the good gas"...guy in my high school put 110 octane into a stock dodge neon and it blew sky high...not sure if it was related to the gas or coincidence, but i wouldnt put 100 octane in my car without being tuned for it...
09-13-2009, 07:26 PM
#3
3rd Gear Member
Join Date: Feb 2008
Location: SC
Posts: 621
You just wasted $80 no offense the octane rating is the fuel ability to resist knocking (detenation) if you dont have really high compression or a tune there is no need to run a higher octane unless the vehicle calls for it. if you have a 93 octane tune you need to run 93 octane. if your car calls for 87 octane run 87. There is no benefit to running a higher octane fuel win its not needed it is a waste of fuel because the unburned just goes out the exhaust. However it will not hurt anything unless you have a vehicle that calls for a higher octane and you put a lower octane fuel instead
(really, it smells different then 93)
09-13-2009, 08:34 PM
#7
5th Gear Member
Join Date: Jul 2007
Posts: 3,731
well, yes and no, it actually will respond to it, as long as you're running a catted exhaust system with the O2 sensors still plugged in.
100 octane burns slower, so it would essentially trick your cars computer into thinking that it was running rich, so the computer would lean out the fuel trim a little (NOT at WOT, only at partial throttle) so that you're using less.
There's a limit to how big of a difference it will make though, I think 93 octane is about the point where it is no longer efficient to get higher octane for better mileage
100 octane burns slower, so it would essentially trick your cars computer into thinking that it was running rich, so the computer would lean out the fuel trim a little (NOT at WOT, only at partial throttle) so that you're using less.
There's a limit to how big of a difference it will make though, I think 93 octane is about the point where it is no longer efficient to get higher octane for better mileage
