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camaro2you
08-31-2005, 04:36 PM
How will a 97 trans am react to medium grade fuel?
GP99GT
08-31-2005, 04:41 PM
itll probably run ok, as long as you arent running it at WOT. be light on the gas pedal, dont put alot of load on the engine (going up hills) or youll get detonation (pinging)
Tsar
08-31-2005, 04:47 PM
Put some ****** gas in JAX on my way down to daytona and car ran like **** after it, until i spent a pretty penny on it (opti, plugs and wires). Maybe it was a coincidence but im not putting ****** gas in my car anymore.
Savage_Messiah
08-31-2005, 05:02 PM
AFAIK it would be compltely fine. stock?
camaro2you
08-31-2005, 05:24 PM
yup the car is bone stock.
Savage_Messiah
08-31-2005, 05:44 PM
What does the manual say? It should be completely fine
Ian
08-31-2005, 05:57 PM
its got a knock sensor, if it knocks it'll pull timing until it doesnt knock anymore. at least thats what I think will happen :lol:
NJSPEEDER
08-31-2005, 06:26 PM
stock, all 4th gens are rated to run on 87 octane. you won't getting maximum performance or gas mileage that way, but teh car will run and drive fine overall.

later
tim
Tsar
08-31-2005, 06:37 PM
stock, all 4th gens are rated to run on 87 octane. you won't getting maximum performance or gas mileage that way, but teh car will run and drive fine overall.

later
timwhy does it say to run premium then ( when u open gas cap thing) :? ??? i dont get it
Fasterthanyou
08-31-2005, 07:13 PM
Newer pcm's can run fine on 87 octane. They have "low octane" spark tables. They will NOT detonate from JUST running 87 octane, it's when you combine that with a lot of heat that you'll start to ping.
There is no more energy in 94 octane than in 87, it's virtually the same amount of btu's. What does this mean? Well it means you won't loose any gas mileage by going to a lower octane (so long as it's not running noticably different). With that being said, it's why I run 87-89 in any sbc with fastburn style combustion chambers and less than 10:1 compression. Add a larger cam and the dynamic compression changes, this in reality lets you run LOWER octane than a tighter cam! The only trouble with this is at WOT where you might be building up a lot more heat in the combustion chamber at high RPM... this is why specific output (horsepower/displacement) is proportional to recommended octane. You can, and I've done it, run a 14.6:1 compression tight cam race engine (600cc motorcycle) on 93 octane. It'll run fine up until about 8000rpm :roll: .
Take it from me, you guys can run 87 octane without ANY problems. Just don't ring out the engine and if you want to have some fun fill up half the tank with premium and go at it. 89-90 octane is fine for a <400hp Lt1/vortec sbc. LS1's are even more resilient.