Lt1 spark advance
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TECH Apprentice
Joined: Jun 2012
Posts: 372
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From: Mississauga Ontario Canada
Lt1 spark advance Hey I'm just wondering what people are getting at WOT on a close to stock setup. My lt1 would get knock retard at anything above 28* in the 4000-4800rpm range and above that I can get around 31*.
This is with a 13.5:1 AFR. I always run 94 octane is this normal for it seems low compared to some other LT1's but the distance/time calculator on datamaster says its doing 0-60mph in 5.4s which is good.
Originally I thought it was false knock because it kept yapping at the same rpm but after dropping my spark advance to 28* in that area and desensitizing the knock sensor a bit it's eliminated it completely.
Just wknte
This is with a 13.5:1 AFR. I always run 94 octane is this normal for it seems low compared to some other LT1's but the distance/time calculator on datamaster says its doing 0-60mph in 5.4s which is good.
Originally I thought it was false knock because it kept yapping at the same rpm but after dropping my spark advance to 28* in that area and desensitizing the knock sensor a bit it's eliminated it completely.
Just wknte
13.5:1 Is on the lean side for making good power. Generally speaking LT's tend to make best power from 12.7-13.1:1. That could be part of the reason you are dealing with spark knock.
I would agree on the AFR, that is a dyno number AFR not a max performance AFR. As I believe I have told you before though with the MSD opti the only way you know what timing is would be a keyed hub a timing pointer and at least a TDC mark.
Teching In
Joined: May 2012
Posts: 30
Likes: 0
Hey I'm just wondering what people are getting at WOT on a close to stock setup. My lt1 would get knock retard at anything above 28* in the 4000-4800rpm range and above that I can get around 31*.
This is with a 13.5:1 AFR. I always run 94 octane is this normal for it seems low compared to some other LT1's but the distance/time calculator on datamaster says its doing 0-60mph in 5.4s which is good.
Originally I thought it was false knock because it kept yapping at the same rpm but after dropping my spark advance to 28* in that area and desensitizing the knock sensor a bit it's eliminated it completely.
Just wknte
This is with a 13.5:1 AFR. I always run 94 octane is this normal for it seems low compared to some other LT1's but the distance/time calculator on datamaster says its doing 0-60mph in 5.4s which is good.
Originally I thought it was false knock because it kept yapping at the same rpm but after dropping my spark advance to 28* in that area and desensitizing the knock sensor a bit it's eliminated it completely.
Just wknte
