unW7WZ

guess ill try switching.... i havent got ping on either 87 or 93. I have been using 93, my car is slightly modded (gutted exhaust, lude intake, walbro, soon to be rtek 1.7 and 720 secs..) and i am having an issue with loss of power (might be something completely unrelated but still worth a try). I believe it could actually be what you were saying, and I know to be true about octane. Please let me know if I am completely off base, but because the fuel isnt igniting fast enough, and indeed may take more spark to burn completely, from using 93, I could actually be losing power.

Above may be off base, but I have TRUE to life experience, as I used 89 in my ford Tbird (DD dont ask) adn I DEFINITELY experienced a hesitation. As soon as I switched back to 87, I realized the ECU was not designed to handle the 89 octane, due to the higher octane's anti-preignition/ faster burning characteristics. In addition, because I have been using 93 in the rex, I have almost the exact same effect as in the tbird. So, I will give it a try, and if i ping, ill go back REAL quick.

RETed

You got that backwards.
Lower octane burns faster.
Higher octane fuel burns slower.


-Ted

unW7WZ

ah i see . But does anything seem logical?

jl1rx7

iTrader: (1)

with gas in the us, it all comes from the same place, weather it be shell, texaco or whatever company sells it, it must meet certain requirments for the area of the country you live in, otherwise its the same gas no matter if its the cheap station or the name brand one, it all goes thru the same pipelines, now people claim that some companys put differnent additives than others, but thats not true, how would it be shipped, pipeline is the cheapest and fastest, and if each company had its own gas, then every time it needed that gas, the pipeline would have to be cleaned and preped just for them, which doesnt happen. so go and buy gas from whatever station you want it all the same, just dont fall into the marketing gimacks.

SwiftTone

Gas from different stations have different quality and additives in them. I work for a major car company and recently we've been having major fuel system related problems with our vehicles. Apparently, due to rising gas prices, gas stations are increasing the octane rating by adding ethenol(alcohol) to lower octane gasoline to increase the octane rating in the gasoline. Ethenol and aluminum fuel parts are not a good mix and will corode the aluminum parts. I dont know what parts of the FC fuel system is aluminum, but some aftermarket fuel pumps may have aluminum parts in it. So far, the Northeast region of the country is where we are seeing almost all of the problems. Also only at small gas station companies. We have not have had problems with customers that regularly get gasoline at Shell, Exxon, Mobile and large chain stores.

Also, smaller gas stations have inferior filtration systems to keep their under ground storage tanks clean, so more dirt and junk will be pumped into your gas tank when you get gas from them.

I agree that you should run the octane rating that the vehicle is designed to run, but only if you are a NA, or a Turbo that is stock. Running higher octane will result in inconplete combustion. The fuel will burn slower and not as clean. You will also get less miles to the gallon.

~Dave

CrackHeadMel

iTrader: (2)

most gas sold by the 'big names' here in the north east is no diffirent from brand to brand. it all comes in on the same boat.