spark blow out problems
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
widebands only read correctly when combustion happens correctly, as said, they dont always tell you what you think...at least not directly.
My tuner and ex boss Steve Williams is a busy guy and I feel bad for bothering him , plus he's in Virginia and I moved to Florida , I really need a solid day to mess with the car so I can figure it out
Did this happen before you moved to FL? Do you have logs that show a detail of your AFR during these misfire events? A maybe 90% duty cycle makes me wonder if you are running lean, and the KR could line up with this idea.
TECH Junkie
Joined: Jul 2015
Posts: 3,012
Likes: 48
Wow, this sounds like the same damn thing I'm dealing with.
21-22psi, .018 gap on ngk 1049s. Even got the random knock he said. E85, 15.5-16.5 timing. 180 eng temps, and AITs below 120.
5.7L 9.5 compression S480/92 1.0 t4
I was wondering if it's 112k OEM truck coils are tired. Thinking about trying those 15% hotter Accel coils. Wish hey wasn't yellow, they ugggly.
How tight can you go?
21-22psi, .018 gap on ngk 1049s. Even got the random knock he said. E85, 15.5-16.5 timing. 180 eng temps, and AITs below 120.
5.7L 9.5 compression S480/92 1.0 t4
I was wondering if it's 112k OEM truck coils are tired. Thinking about trying those 15% hotter Accel coils. Wish hey wasn't yellow, they ugggly.
How tight can you go?
My setup put down 990HP through a 4l80 at 22-23psi. I feel like 1200ish crank HP and a one range colder then stock plug is pretty bad advice. Open to other suggestions though, thanks guys.
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Verdad Gallardo TECH Junkie
Joined: Jul 2015
Posts: 3,012
Likes: 48
I been running this truck under boost for 4 years. I been through all the plugs up to 8s and gapping down put the breaking up fourth down the boost train.
My setup put down 990HP through a 4l80 at 22-23psi. I feel like 1200ish crank HP and a one range colder then stock plug is pretty bad advice. Open to other suggestions though, thanks guys.
My setup put down 990HP through a 4l80 at 22-23psi. I feel like 1200ish crank HP and a one range colder then stock plug is pretty bad advice. Open to other suggestions though, thanks guys.
Wow, this sounds like the same damn thing I'm dealing with.
21-22psi, .018 gap on ngk 1049s. Even got the random knock he said. E85, 15.5-16.5 timing. 180 eng temps, and AITs below 120.
5.7L 9.5 compression S480/92 1.0 t4
I was wondering if it's 112k OEM truck coils are tired. Thinking about trying those 15% hotter Accel coils. Wish hey wasn't yellow, they ugggly.
How tight can you go?
21-22psi, .018 gap on ngk 1049s. Even got the random knock he said. E85, 15.5-16.5 timing. 180 eng temps, and AITs below 120.
5.7L 9.5 compression S480/92 1.0 t4
I was wondering if it's 112k OEM truck coils are tired. Thinking about trying those 15% hotter Accel coils. Wish hey wasn't yellow, they ugggly.
How tight can you go?
On The Tree
Joined: Jun 2015
Posts: 182
Likes: 3
From: Portland OR
To explain:
A wide band measures O2 levels in the exhaust.
When a cylinder misfires because it is overfueled it raises the level of O2 in the exhaust.
To those who directly interpolate O2 output into AFR are mislead, instead of seeing it for what it is.
This is why a Dyno with a 3 gas analyzer can be helpfull.
The false lean (elevated levels) from the O2 sensor would be accompanied by reduced CO and an HC spike in the above scenario.
If it is smoking like a diesel it might be rich.....
A wide band measures O2 levels in the exhaust.
When a cylinder misfires because it is overfueled it raises the level of O2 in the exhaust.
To those who directly interpolate O2 output into AFR are mislead, instead of seeing it for what it is.
This is why a Dyno with a 3 gas analyzer can be helpfull.
The false lean (elevated levels) from the O2 sensor would be accompanied by reduced CO and an HC spike in the above scenario.
If it is smoking like a diesel it might be rich.....
I talked to Steve today and I'm going to test the valve springs seeing that I hit full boost far before I start breaking up , I know someone in here suggested that and I thank you sir
TECH Junkie
Joined: Jul 2015
Posts: 3,012
Likes: 48
I been running this truck under boost for 4 years. I been through all the plugs up to 8s and gapping down put the breaking up fourth down the boost train.
My setup put down 990HP through a 4l80 at 22-23psi. I feel like 1200ish crank HP and a one range colder then stock plug is pretty bad advice. Open to other suggestions though, thanks guys.
My setup put down 990HP through a 4l80 at 22-23psi. I feel like 1200ish crank HP and a one range colder then stock plug is pretty bad advice. Open to other suggestions though, thanks guys.
I only mentioned springs because you said you have duals. They are known for "soft" failures. Instead of dumping a valve and grenading your engine, they tend to break one coil and reduce performance.
TECH Junkie
Joined: Jul 2015
Posts: 3,012
Likes: 48