What Octane do you run?
09-08-2007, 02:47 PM
#21
2nd Gear Member
Join Date: Jul 2007
Location:
Posts: 155
RE: What Octane do you run?
ORIGINAL: PLstang
I run 93 with a tune and spraying a 125 shot. However, stock I ran....wait...never mind my car went from the dealership to the speed shop. I never ran stock
I run 93 with a tune and spraying a 125 shot. However, stock I ran....wait...never mind my car went from the dealership to the speed shop. I never ran stock
I`ll be doing the same thing, but this is what the head mechanic at my Ford dealer told me. He said there is no reason to run higher octane in your car unless you install performance mods that specifically state a need for higher octane fuel. He pointedly said it was a waste of money.
But he also said that any mods that required higher octane fuel absolutely should get it.
So I say run good quality 87 until you mod and need the higher octane stuff.
Eric
09-08-2007, 03:51 PM
#25
4th Gear Member
Join Date: Apr 2007
Location: S.Florida
Posts: 1,612
RE: What Octane do you run?
a little off w/ that. higher octane causes timing to adjust to burn off all fuel. when this happens you see a slight increase in power.
ORIGINAL: Dragon Stang
F.Y.I.
Here's an article about gasolines...
http://www.ftc.gov/bcp/edu/pubs/cons...tos/aut12.shtm
Also, running a higher octane fuel in an engine designed to run 87 regular can have detrimental effects on the emission systems, specifically, the catilytic converters by overloading them with unburned hydro carbons. High octane fuels are designed to burn slower for higher compression or cylinder pressures. Unfortunately, the term "premium" used with high octane fuels is misleading. The fuel is no better in engine, injectorcleaning than regular grades from the big suppliers. All grades have the same basic additive packages. The only difference being the octane boosting agent used. Save your money unless you have modified your engine to run higher octane fuels.
F.Y.I.
Here's an article about gasolines...
http://www.ftc.gov/bcp/edu/pubs/cons...tos/aut12.shtm
Also, running a higher octane fuel in an engine designed to run 87 regular can have detrimental effects on the emission systems, specifically, the catilytic converters by overloading them with unburned hydro carbons. High octane fuels are designed to burn slower for higher compression or cylinder pressures. Unfortunately, the term "premium" used with high octane fuels is misleading. The fuel is no better in engine, injectorcleaning than regular grades from the big suppliers. All grades have the same basic additive packages. The only difference being the octane boosting agent used. Save your money unless you have modified your engine to run higher octane fuels.
09-08-2007, 08:13 PM
#29
2nd Gear Member
Join Date: Sep 2007
Location: Michigan
Posts: 315
RE: What Octane do you run?
[quote]ORIGINAL: lldsandsll
a little off w/ that. higher octane causes timing to adjust to burn off all fuel. when this happens you see a slight increase in power.
[quote]
The compression ratio of a given engine is what determines its octane requirements. Since most engines have a compression ratio designed for 87-octane unleaded fuel, all should be well in staying regular with regular. Even if you have a super-performance sportster with a big "91 ONLY" sticker on the gas cap, no harm will likely come if 87 is added by mistake. Modern engines come equipped with a knock sensing system, which listens for detonation and tells the engine computer to adjust spark timing until detonation is eliminated.
Conversely, the engine computer in a vehicle built to run on regular will not sense an increase in octane and adjust ignition timing to take advantage of the higher octane, so pouring in the premium in an engine not designed to take advantage of it is the equivalent of shooting money out of the tailpipe. All this is, of course, is a massive oversimplification, yet the fact of the matter is this: If your engine is designed to use 87 octane, yet rattles away like Carmen Miranda shaking her maracas every time you hit the gas pedal, then something is wrong—and it's only going to get worse.
http://www.valvoline.com/carcare/art...2&scccid=2
a little off w/ that. higher octane causes timing to adjust to burn off all fuel. when this happens you see a slight increase in power.
[quote]
The compression ratio of a given engine is what determines its octane requirements. Since most engines have a compression ratio designed for 87-octane unleaded fuel, all should be well in staying regular with regular. Even if you have a super-performance sportster with a big "91 ONLY" sticker on the gas cap, no harm will likely come if 87 is added by mistake. Modern engines come equipped with a knock sensing system, which listens for detonation and tells the engine computer to adjust spark timing until detonation is eliminated.
Conversely, the engine computer in a vehicle built to run on regular will not sense an increase in octane and adjust ignition timing to take advantage of the higher octane, so pouring in the premium in an engine not designed to take advantage of it is the equivalent of shooting money out of the tailpipe. All this is, of course, is a massive oversimplification, yet the fact of the matter is this: If your engine is designed to use 87 octane, yet rattles away like Carmen Miranda shaking her maracas every time you hit the gas pedal, then something is wrong—and it's only going to get worse.
http://www.valvoline.com/carcare/art...2&scccid=2
