Ive been runnin my car on 93 for the last couple weeks..milage has gone down a little but theres definitly a difference in performace..what do you guys think? i have an 00 Z24 bone stock..good or bad to run it on 93 all the time?
My Other Ride
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Quote:
..what do you guys think?
i think its all in your head..the octane rating has nothing to do with power
I always thought the higher the octane, the BETTER mpg.
Cancel my subsription to the resurrection.
Ugh.... it's not an endless debate... it's quite a clear answer...
Octane Rating is simply a measurement of how much compression a fuel type can withstand before detonating simply due to pressure.
Gasoline will combust if compressed to a known point without any spark or ignition. Low octane fuel will combust at relatively low compression. One can deduct from this that if 87 octane fuel is put into a high compression motor (which a LD9 is not), it will combust before the spark plug actually ignites it (this is called detonation). Detonation is bad since the fuel starts to burn well before the piston comes to top-dead-center. High compression motors (again, not LD9's) use high octane fuel because they NEED it. The fuel is simply accomodating the motor's need for a fuel that will not detonate until the spark plug fires.
PUTTING HIGH OCTANE FUEL INTO A LOW COMPRESSION MOTOR IS USELESS AND OFTEN RESULTS IN A PSYCHOLOGICAL PHENOMENON CALLED THE
PLACEBO EFFECT, MEANING THE SUBJECT BELIEVES THERE IS IMPROVEMENT BECAUSE HE EXPECTS IMPROVEMENT.
Octane does not:
1.) cause the fuel to burn more efficiently
2.) cause the fuel to burn hotter
3.) cause the fuel to burn cleaner
4.) cause more power to a motor not designed to take advantage of it
Look Here
there was a thread about this a while ago. our cars are meant to run on 87 and to be putting in 89-93 is pointless
Thats a great textbook description of octane and combustion of fuel, TIM, right on!
HP tuners should be able to fix that....
my boss is running his truck on 89 octane right now. he has it tuned with an SCT tunner. the timming is bumped up to increase power. but, with too much of an increase timming, detonation will occur. to prevent detonation he runs a higher octane.
with out the higher octane, his truck would ping like hell. being a ford ranger, and having it equpied with Eec (spelling?), which is a really impressive computer for something ford produced, it will knock timming out of it if it pings. if he hads timming to the point of pinging and the truck is removing timming, it would defeat the purpose and not give you any power.
now hopefully HP will be giving us the same benefits. most of the import engines from nissan and toyota for example in their high end suv's that produce like 240 hp on 91 octane only produce so much because of the tunning over the ones that would be in the Camry for example only producing like 180hp on 87 octane.
putting in a higher octane for a car that cant utilize the potential of it wont do anything but hurt your wallet and boost your ego. i used to put in 93 every nce and a while and had the placebo effect on me aswell.
there are other ways to go about tunning you engine to run on higher octane. high compression pistones for example will do the same. our cars are something like 9.5:1 compression i believe. from what i remember anything up to like 11:1 can still run pump gas easily.
now if you could increas your compression, you wouldnt look so nieve pumping some 91 or 93 octane into your naturally asp. j-body.
Injection is nice but id rather be BLOWN!
http://www.cardomain.com/ride/2290307
agreed... increased compression or more advanced timing would make using high octane worthwhile...
i used 89 in my 97 2.2 forever, never hurt anything and i honestly think it get's better gas millage despite what you guys say.
i took a 300 mile road trip on a quarter tank of gas, drove all week down there and filled up before i left and only used 9.2 gal total. not even counting the driving i did once i was there i still got 33mpg, so i was mid-high 40's would be my guess.... crazy gas millage for a non-hyrbid
or maybe i got one of those freak engines, i duno?
or maybe it was because you were doing all highway miles... my gf and I just recently took a small trip from Baltimore to Virginia Beach (the long way via the Chesapeake Bay Bridge Tunnel) and I got 33-35 mpg... awesome mileage... because I was doing 55 for 5.5 hours straight... with 55 being the peak gas mileage speed for most small cars, do the math and I did approximately 300 miles at the PEAK fuel efficient speed...
you should get around over 40mpg on the highway. I do 33-35mpg in town with the auto Z.
Gilles
2.3 Ho
yeah well I get 28 mpg...highway haha...no idea how you guys are getting 33+
34mpg for me via highway. I can get 550km on a single highway spent tank.
My Cav
I give up...
i'm buying a VW those people love trees, so they should love eachother too... "Andy"
between 70 and 75 usually in 5th
