What grade of gas do you guys put in your Z28's? Is it premium? If it is do you really have to use such a high grade of gas?

 

I usually put AMoco 93. I would not put anything less than 92 octane in my tank.

 

I run 92 Octane or higher. Anything lower, I get a pinging noise. I have heard of others running lower octane without any loss of performance or noise. It usually goes that higer compression engines need higher octane gas.

 

What is the compression ratio for a z28?

 

i believe it's 10.5 to 1. i only run 93 octane...you can run lower but you'll lose performance since your computer is going to retard your timing.

 

i usually run 92 Octane
It just runs better w/ it
Try a few tanks

 

Well, on the gas gauge, you see the words: "Premium Fuel ONLY". Its better to be safe than sorry, the gas burns cleaner and converts more energy than lower octane, and you can be POSITIVE that no knock will occur in an otherwise working engine.

I've always ran 93, and if I could get higher I'd buy that.

 

with 11.4:1 i can run 91.. but i don't... i usually run 92 for around town.. and when i race i run 94

 

I run premium only. after talking to the guy that has built the last five motors for my family he was telling me about how the chemical formula for gas has changed and is continuing to change and although it is supose to burn "cleaner" if your engine is older than 99 or so anything less than premium can do serious damage. I havn't looked into it myself yet but I will take his word for it.

 

I wish I can get 92+ octane out here in cali...

 

93 or higher.

93 is my usual fill up, but when I have some spare cash, there's a 97 pump in town and I fill up with that. MAN, SHE REALLY LOVES IT! Wish I could run that all the time.

BTW--custom PCM programming in my car.

DJ

 

best ive ever seen is 92 and i rarely see that so 91(premium) is kinda what i use by default. i envy all you guys who can get 94+ octane at the pump

 

What grade is gas rated at most of the time? I mean what is the difference between regular, super and premium, I always thought premium was usually like 92 octane. Never really payed attention though, since I haven't had to fill my firebird up yet, because it was in storage a week after I got it.

 

i didnt know they made less than 93 octane premium. here in FL
our regular is 87, our midgrade is 89, and our premium is 93.
there is also a gas station in town that sells 104 octane race fuel since we do have alot of street rods around here on the weekend that need to refuel before going home. I like to mix a few gallons of 104 octane with the 93 octane occasionally. WoW what a difference.

 

When all the people who are familiar with LT1s have the first reaction of saying, "wow, u have a strong LT1" one of the reasons i tend to agree with this statement is because i have never run anything but premium 93. With the compression of our 350, it burns a lot more efficiently.