What kind of gas in an LT1 Trans Am?

Question

What octane gas does a 93-97 Trans Am take?

Answer 1

I had an LT1 in my Impala ss, I ran 93 octane gas in it as much as possible. I had no problems for the 50k worth of miles I had put onto it..... until I wraped the car around the back of a stopped semi-truck.

Answer 2

*Q: What brand or grade of gas should I use in my car?

A: This is an age-old question, perhaps asked as much as which is better, Ford or Chevy. There is no real answer to this question, but here is a post by [e-mail] on LS1.COM.



I'm in the fuel refinery business and maybe I can shed a little light. It's true that most of the fuel in a given area will come from the same bulk plant. I live in St. Louis, and all the Shell Mobil, and Amoco come from the Shell Terminal. Gasoline is a commodity and if you have a refinery in your area the gasoline comes from there, otherwise it gets to your area in one of the many pipelines that not many people know about. What makes Shell Shell and Mobil Mobil is the top secret additives that go in to the transport at the loading rack. As for Amoco Ultimate being clear, the sad news is that all refined gasoline is clear, They have to add the dye to identify the product. Also in every market there are two or three other bulk plants that supply the cut-rates and other stations that you would think would be OK.


Not so, the cut-rates are cheaper for a reason. Octane is made by adding something called aromatics , benzene, toulunal, Xylene etc. That stuff is the big expense. Typically gasoline that comes out of the pipeline will wholesale at .45 or .55 and after the taxes additives etc. it will retail for 1.099 for example. The taxes being the biggest part. When the /republicans whine about taxes and increases that Bill made, most of was in fuel tax.


Then if you live in an area that has the privilege of "reformulated fuel" the rules all change. Reformulated only means that they add an oxygenator to the mix (MBTE) or more often ethanol. It increases the amount of oxygen in the fuel but does squat for performance. The emissions are less. That is the name of the game. The point is that Amoco in Florida is not the same as in Chicago. Experiment, whatever works best, go with it. Stay away from the cut rates. I see what comes out of the filters and it isn't so nice. In my area Amoco Ultimate (5% benzene for now) works the best in my sled, but in other parts of the country another major oil will have what you want.


*Q: What octane gas should I use in my car?

A: Well, once again, this is up to you, but first, lets explain what octane really is. Essentially, the higher the octane of gas, the more amount of oxygen it takes to burn the fuel. The more oxygen used to burn the gas means the quicker and cleaner it will burn. In larger, performance minded engines, you need to have a clean burning, fast fuel. Engines like the LS1 and LT1 have a computer, which is set to provide as much oxygen necessary to burn the fuel. Smaller displacement engines don't need a faster burning gas, and can get by with a lower octane gas, like 87. The computers in those cars are only set to give that engine so much oxygen per each spray of gas into the engine. If you put 93 octane gas in a car that's designed to run on 87, then the oxygen to gas ratio will be incorrect, and the fuel may not properly burn, thus harming the engine and performance of the car. So, getting to the point, if you run too low of an octane gas in an engine like the LS1, it is not putting more oxygen into the engine than necessary, so it will adjust the timing of the engine so it doesn't overdo it. Although this won't harm the engine, the fuel to air ratio will be less than optimal, and this will decrease your performance. So, running anything other than premium gas (which is usually between 92 and 94 octane depending on where you go) can potentially make your car run less than what it could. To be safe, the manufacturer recommends that you do not run anything lower than premium gas in the V8s.

Answer 3

If you can find 93 octane, go ahead. I have yet to find that in my area. I use 91 premium gas with my 95 Trans Am. Runs fine with it. The previous owner warned me that if I was to use regular 87 octane, that the engine will be noticeably sluggish but will still run. I haven't put anything under 91 in my baby as of yet though!

Basically, stick with premium 91 unless you can actually find 93 octane

Answer 4

Those saying that premium gas is needed are right. Above a 90+ octane is supposed to be used in its high performance engine.

You wouldn't put regular gas into a Corvette now would you, haha? The LT series engines are no different. :)

Answer 5

looks like a ordinary joint to me! placed the vehicle in impartial, and practice the parking brake on a point floor. you will could craw below the vehicle and including your hand grab the the force shaft which runs from the transmission to the rear axle. attempt turning the force rod the two left and spectacular, and verify the play interior the shaft. If there is better than 3/8 of an inch play then the the needle cup bearings are shot or no longer even there. The clunk sound is the force shaft ordinary joint slapping around in element the cup bearings. There are 2 ordinary joints at the two end of the force shaft. be advantageous to visually look at the two ends. additionally verify your rear axle mounts to the chassis and insure one isn't broken. And ultimately verify your leaf-spring shackles and the rubber bushings on the shackles. Any of those 3 issues might reason a significant klunk once you advance up promptly. wish that facilitates! stable luck and have a advantageous day!

Answer 6

premium 93 octane

Answer 7

Regular, I think it's rated at a 87 octane.

Answer 8

93 Trans Am

Answer 9

Premium is what I used in my 88 firebird, ran like a dream. I should have never gave it away.