Edge and Timing Advance
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Senior User
Joined: Jan 2005
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From: San Antonio, Texas
Edge and Timing Advance
I have a '05 Scab 5.4L 4x4 16,000 mi with the Edge installed. I have been running lvl 2 with great results. I thought I would experiment with lvl 2 using 89 octane gas. I originally advanced the timing +2 by mistake instead of +1. I had some slight detonation and backed down to +1.75 and it runs great without detonation, then I read it should only be +1. If it is running fine will this hurt the engine or give a little added performance? The 89 makes a big difference at this setting, added more power and about 1 mpg but definitely don't want to do any damage. Thanks.
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From: Burleson, TX
You can be running lean without hearing detonation. On the other hand, I am sure they built safty room into their program. I would not want to run +1.75 but would probaly run +1.25 and see what my results were. That is just my opinion, nothing to really base it on. I would be very cautious about running lean. I run level 3 with 93 and have it at +1.25, and have for about 30,000 miles.
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From: CO
Originally Posted by JimTex
You can be running lean without hearing detonation.
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From: San Antonio, Texas
I still have the question though; do you get better performance setting the timing as far advanced as you can without getting detonation or would the benefit start to drop off at a certain point?
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From: Burleson, TX
Originally Posted by VFR_Man
I think you mean to say the engine can be running with some pre-ignition without hearing a ping. A lean condition usually describes the A/F ratio.
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From: Burleson, TX
Originally Posted by dfishrmn88
I still have the question though; do you get better performance setting the timing as far advanced as you can without getting detonation or would the benefit start to drop off at a certain point?
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From: CO
Without doing a series of dyno runs to see when peak hp starts dropping, you're going to have a hard time telling where that exact point is located, and once you found it, you would retard it just a touch anyway to be safe.
Not having any experience tuning these engines, I'm guessing you're chasing a fairly small gain when you're trying to dial the timing to that gnat's azz level. Unless you're in the Craftsman truck series, I'd suggest just playing it on the safe side.
Not having any experience tuning these engines, I'm guessing you're chasing a fairly small gain when you're trying to dial the timing to that gnat's azz level. Unless you're in the Craftsman truck series, I'd suggest just playing it on the safe side.
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Joined: Oct 2007
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From: Burleson, TX
Originally Posted by VFR_Man
Without doing a series of dyno runs to see when peak hp starts dropping, you're going to have a hard time telling where that exact point is located, and once you found it, you would retard it just a touch anyway to be safe.
Not having any experience tuning these engines, I'm guessing you're chasing a fairly small gain when you're trying to dial the timing to that gnat's azz level. Unless you're in the Craftsman truck series, I'd suggest just playing it on the safe side.
Not having any experience tuning these engines, I'm guessing you're chasing a fairly small gain when you're trying to dial the timing to that gnat's azz level. Unless you're in the Craftsman truck series, I'd suggest just playing it on the safe side.
