octane
4/24/05, 01:22 AM
#2
Join Date: February 3, 2005
Location: Los Banos CA
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The computer is programmed for 87 octane. You are just wasting money buying 93 without a custom tune.
4/24/05, 04:45 PM
#4
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Octane is a mesure of how fast the gasoline burns. Higher octane burns slower. It is for high compression engines. Using high octane in your car is a waste of money and does not make it run better. The 4.0 and 4.6 were designed to run on 87 octane. Even my '67 289 4V runs fine on 87.
4/24/05, 08:36 PM
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I posted this in another thread dealing with octane and the 2005, here it is again.
April 2005 5.0 Mustang & Super Fords magazine, page 121:
"Our final test was to try different fuels by pumping out what was left of the 91 octane, then trying regular 87 octane, followed by 104 octane unleaded racing gas. There's definitely power in moving from 87 to 91 octane as the engine management follows the knock sensor. At 2500 rpm the gain is 2.7 hp and 4500 rpm we saw the largest "octane gain," a healthy 5.7 hp and 7.5 lb-ft jump, followed by a slight tapering in the gain. At 6000 rpm, the difference was 2.7 hp, still in the 91 octane's favor. No doubt the '05 engine management/knock sensor is tuned to allow more ignition timing(increased octane cannot raise power by itself unless the engine had been detonating on lower octane fuel."
The found no gain in using 104 race gas, maybe because of the slower burn rate, they weren't sure.
This testing was done at the Kenne Bell labs on a car they bought to R&D their upcoming super charger.
The octane testing was independant of the other tests. Their BASELINE car, with 91 octane was putting out 279.78hp @5200, and 301.46 ft-lbs tq @4400.
With an SCT tune, no HC/trap and 91o they got 287.54hp @ 5500 and 307.78tq @4300.
So, according to Kenne Bell, and 5.0 Mustang Magazine if you want more HP, use 91o gas.
I run Amoco 92 regardless of whatever tune I have in the car.
Use what you can afford.
Chris
April 2005 5.0 Mustang & Super Fords magazine, page 121:
"Our final test was to try different fuels by pumping out what was left of the 91 octane, then trying regular 87 octane, followed by 104 octane unleaded racing gas. There's definitely power in moving from 87 to 91 octane as the engine management follows the knock sensor. At 2500 rpm the gain is 2.7 hp and 4500 rpm we saw the largest "octane gain," a healthy 5.7 hp and 7.5 lb-ft jump, followed by a slight tapering in the gain. At 6000 rpm, the difference was 2.7 hp, still in the 91 octane's favor. No doubt the '05 engine management/knock sensor is tuned to allow more ignition timing(increased octane cannot raise power by itself unless the engine had been detonating on lower octane fuel."
The found no gain in using 104 race gas, maybe because of the slower burn rate, they weren't sure.
This testing was done at the Kenne Bell labs on a car they bought to R&D their upcoming super charger.
The octane testing was independant of the other tests. Their BASELINE car, with 91 octane was putting out 279.78hp @5200, and 301.46 ft-lbs tq @4400.
With an SCT tune, no HC/trap and 91o they got 287.54hp @ 5500 and 307.78tq @4300.
So, according to Kenne Bell, and 5.0 Mustang Magazine if you want more HP, use 91o gas.
I run Amoco 92 regardless of whatever tune I have in the car.
Use what you can afford.
Chris
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