Dyno #'s 87 Oct. vs 91/92/93 premium
10/14/10, 06:51 AM
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Dyno #'s 87 Oct. vs 91/92/93 premium
Just curious if anyone has checked this. I've never run anything but premium and was wondering if the factory got there numbers with 87?
10/14/10, 06:54 AM
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isn't the HP rating like 402 on the regular octane and 412 on the 91 or 93 ? i thought i saw that someplace in the Ford Lit. But i have been wrong once or twice before so maybe not 
yup here it is from there (Ford's) spec sheet
"Horsepower (SAE net @ rpm) 305 @6,500 Regular Fuel: 402 @ 6.500, Premium Fuel: 412 @ 6,500"
but after some thought i bet you are asking for "real world" numbers and i hope someone has them too would be fun to compare !
yup here it is from there (Ford's) spec sheet
"Horsepower (SAE net @ rpm) 305 @6,500 Regular Fuel: 402 @ 6.500, Premium Fuel: 412 @ 6,500"
but after some thought i bet you are asking for "real world" numbers and i hope someone has them too would be fun to compare !
Last edited by rodmoe; 10/14/10 at 06:58 AM. Reason: researched statement after post !!
10/14/10, 10:57 PM
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412 rating is on 91 Octane.
You lose about 10 hp using 87 octane.
You gain essentially no power using 93 Octane instead of 91 octane in a stock car. I dynoed tested it. The stock ecu is programmed to make it's peak power on 91 octane, adding anything higher seems a pure waste of money. I may try going straight 100 octane and dyno it and see if even that adds any power to the stock tune, but I doubt it highly.
If 402 or so hp is plenty for you, use 87.
But if you want the full 412 (really it's about 416-418) the factory rates the car at, use 91. If you are in a state that offers only 93 octane, use it, or mix it up. Use 93 sometimes and 89 others and you'll have a nice 91 octane mix for full stock power.
You lose about 10 hp using 87 octane.
You gain essentially no power using 93 Octane instead of 91 octane in a stock car. I dynoed tested it. The stock ecu is programmed to make it's peak power on 91 octane, adding anything higher seems a pure waste of money. I may try going straight 100 octane and dyno it and see if even that adds any power to the stock tune, but I doubt it highly.
If 402 or so hp is plenty for you, use 87.
But if you want the full 412 (really it's about 416-418) the factory rates the car at, use 91. If you are in a state that offers only 93 octane, use it, or mix it up. Use 93 sometimes and 89 others and you'll have a nice 91 octane mix for full stock power.
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