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What Octane to use on 496?

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Old 04-25-2005 | 09:11 AM
  #11  
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Default Re: What Octane to use on 496?
yes the 496 has a knock sensorand I believe it adjusts fuel an timing.
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Old 04-25-2005 | 09:51 AM
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Default Re: What Octane to use on 496?
Can the ecm be reprogrammed for 92 octane? can you get any hp gain from having an ecm reprogrammed? I have a 496 ho.
thanks
I am sure I going to sound stupid when I say I was running 87 octane and the transom use to be covered with black soot. even after a short run. I switched to 92 and the black went away.
Maybe I just had really good coat of wax? or is their a more scientific answer.
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Old 04-25-2005 | 10:29 AM
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Default Re: What Octane to use on 496?
Originally Posted by jcimprover
Can the ecm be reprogrammed for 92 octane? can you get any hp gain from having an ecm reprogrammed? I have a 496 ho.
.
Yep, Dustin @ Whipple does this. He advances the timing to pick up extra hp, hence the need for 92 octane.
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Old 04-25-2005 | 10:56 AM
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Default Re: What Octane to use on 496?
Only 87 in my pair.
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Old 05-16-2005 | 12:19 PM
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Talking Re: What Octane to use on 496?
How about a 420 Hp carbed engine? What octane would you want to run in there??
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Give me the poop on the 420hp merc.

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