This is topic Highest Octane with 5.0 efi in forum Tech Talk at Northern California Ford Owners .
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Posted by Blownhatch (Member # 167) on
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What is the highest octane you can run in a 5.0 E.F.I system...
Posted by FasterDamnit (Member # 442) on
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What for? Going to ad boost? Will run great on 87 (designed for it.) You can run higher octane but will not see any more power or mpg. Only reason to up the octane is if you are detonating.
Posted by Blownhatch (Member # 167) on
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14# of boost 16degree timing.. looking to run some race gas in the tank but dont wont to blow up halfway down the track..
Posted by BlackNGold (Member # 655) on
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The higher the ocatane rating the slower the gas burns...Don't worry you won't blow anything up...I believe the only thing you have to worry about is the lead in any fuel higher than 102 octane...The lead will fuck up your cats and O2's...
Posted by 66 AC COBRA (Member # 904) on
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quote:
Originally posted by BlackNGold:
The higher the ocatane rating the slower the gas burns...Don't worry you won't blow anything up...I believe the only thing you have to worry about is the lead in any fuel higher than 102 octane...The lead will fuck up your cats and O2's...
![[patriot]](graemlins/patriot.gif)
Posted by TURLX50 (Member # 3928) on
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ive ran 105 with no cat and besides the beautiful smell i didnt notice much unless you advance timing..
Posted by hawaii5.0 (Member # 4675) on
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quote:
Originally posted by BlackNGold:
The higher the ocatane rating the slower the gas burns...Don't worry you won't blow anything up...I believe the only thing you have to worry about is the lead in any fuel higher than 102 octane...The lead will fuck up your cats and O2's...
SO DOES THAT MEAN I SHOULD GET BETTER GAS MILEAGE WITH 92 OCTANE THAN 87 OCTANE ON A STOCK 5.0?
Posted by illwill510 (Member # 3788) on
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i have experenced smoother ignition throught the powerban and overall better drivability when using 91 ocatne & octane boost. seems to be more power ![[burnout]](graemlins/burnout.gif)
Posted by Blue Oval (Member # 2548) on
:
quote:
Originally posted by hawaii5.0:
quote:
Originally posted by BlackNGold:
The higher the ocatane rating the slower the gas burns...Don't worry you won't blow anything up...I believe the only thing you have to worry about is the lead in any fuel higher than 102 octane...The lead will fuck up your cats and O2's...
SO DOES THAT MEAN I SHOULD GET BETTER GAS MILEAGE WITH 92 OCTANE THAN 87 OCTANE ON A STOCK 5.0?
no!
Posted by BlackNGold (Member # 655) on
:
quote:
Originally posted by hawaii5.0:
quote:
Originally posted by BlackNGold:
The higher the ocatane rating the slower the gas burns...Don't worry you won't blow anything up...I believe the only thing you have to worry about is the lead in any fuel higher than 102 octane...The lead will fuck up your cats and O2's...
SO DOES THAT MEAN I SHOULD GET BETTER GAS MILEAGE WITH 92 OCTANE THAN 87 OCTANE ON A STOCK 5.0?
Please don't write in CAPS, it means you're yelling...
No, 91 octane burns slower and unless you have advanced your timming you really won't benefit from using a higher octane fuel...
For instance, on your average 5.0, if you're running 10 degrees timming and 87 octane you're probably safe and actually running close to detonating, but you're not actually detonating...
If you increased your timming a couple of degrees and still ran the 87 octane you would most likely detonate...
The most popular and free horse power upgrade on a 5.0 is advancing your timming...You get the most power when you find out the best position (normally around 14 degrees before top dead center) of where the piston in relationship to when the spark plug ignites on an engines power stroke....
Hawaii5.0~try this page...It has a lot of useful info... http://auto.howstuffworks.com/ignition-system1.htm
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