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LS1-how rich is too rich?

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Old Apr 22, 2022 | 06:26 PM
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Default LS1-how rich is too rich?

My car seems to be running better at Lambda .85 to .95. Is that too rich?

Quick background:
I had some issues with old/worn/dried out parts so what could be upgraded was. Rest was Fixed.
- Mamo intake and TB + 5" plumbing & MAF- melted cats on old exhaust so Kooks 3" installed
so, redoing MAF and VE
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Old Apr 22, 2022 | 07:07 PM
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Are you talking about idle, cruise, WOT?

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Old Apr 22, 2022 | 09:31 PM
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Originally Posted by LilJayV10
Are you talking about idle, cruise, WOT?
Cruise. Idle is .98 +/- 6. I am staying below 4k rpms until I get this all within 2%. Then I will have HPT predict settings above whatever the highest airflow I log...probably 5k. Then I will log higher RPM runs
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Old Apr 22, 2022 | 10:07 PM
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Engine might make more torque that way but the plugs and cylinder will stay cleaner if you run a lean cruise. A lean cruise helps clean up the plugs from all the dirty time spent in other driving conditions.
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Old Apr 22, 2022 | 10:25 PM
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Originally Posted by FCar2000TA
My car seems to be running better at Lambda .85 to .95. Is that too rich?

Quick background:
I had some issues with old/worn/dried out parts so what could be upgraded was. Rest was Fixed.
- Mamo intake and TB + 5" plumbing & MAF- melted cats on old exhaust so Kooks 3" installed
so, redoing MAF and VE
With ls1 ignitions, even if you just left it at .85 all the time it would not hurt anything but gas mileage. More importantly, what do your plugs look like and what F/A ratio makes it run best. Keep in mind that air fuel gauges can lie, but plugs and power can't. When in doubt, trust actual hard parts over gauge readings.
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Old Apr 22, 2022 | 11:06 PM
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Originally Posted by gametech
With ls1 ignitions, even if you just left it at .85 all the time it would not hurt anything but gas mileage. More importantly, what do your plugs look like and what F/A ratio makes it run best. Keep in mind that air fuel gauges can lie, but plugs and power can't. When in doubt, trust actual hard parts over gauge readings.
Agree 100%. Always, always, always read your plugs, regardless of what any AFR gauge is telling you. Tune with plugs, not the gauge. The gauge will get you close, and that’s it.
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Old Apr 22, 2022 | 11:31 PM
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.85 is fat, like PE fat. Your mileage would be terrible. .90 is marginally better.
Were it in closed loop it would be very near 1.

Will it ever be closed loop?
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Old Apr 23, 2022 | 12:14 AM
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Originally Posted by RonSSNova
.85 is fat, like PE fat. Your mileage would be terrible. .90 is marginally better.
Were it in closed loop it would be very near 1.

Will it ever be closed loop?
You are correct, but even .85 will never hurt anything with properly firing plugs. I bet hundreds of thousands of Holley square bores were put on cars with out of the box jetting at least that rich, and nobody cared because their car started easier on cold mornings. Not like you are fouling plugs out or washing the bore at .85. Probably not even going to make your oil smell gassy.
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Old May 5, 2022 | 10:19 PM
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Originally Posted by gametech
You are correct, but even .85 will never hurt anything with properly firing plugs. I bet hundreds of thousands of Holley square bores were put on cars with out of the box jetting at least that rich, and nobody cared because their car started easier on cold mornings. Not like you are fouling plugs out or washing the bore at .85. Probably not even going to make your oil smell gassy.
I have to say I agree, but if that's the best that's going to be done, he may as well throw a un-tuned carb, out of the box on it.
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Old May 6, 2022 | 12:26 AM
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Originally Posted by RonSSNova
.85 is fat, like PE fat. Your mileage would be terrible. .90 is marginally better.
Were it in closed loop it would be very near 1.

Will it ever be closed loop?
It will be in closed if I can ever get the car to come to a stop without the RPMs going in the dirt and frequently dieing, or the new engine and wire harness gets here, and I have the car professional retuned.
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Old May 6, 2022 | 12:28 AM
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Originally Posted by gametech
You are correct, but even .85 will never hurt anything with properly firing plugs. I bet hundreds of thousands of Holley square bores were put on cars with out of the box jetting at least that rich, and nobody cared because their car started easier on cold mornings. Not like you are fouling plugs out or washing the bore at .85. Probably not even going to make your oil smell gassy.
I am not getting any codes for misfires.
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Old May 6, 2022 | 12:29 AM
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Originally Posted by gametech
You are correct, but even .85 will never hurt anything with properly firing plugs. I bet hundreds of thousands of Holley square bores were put on cars with out of the box jetting at least that rich, and nobody cared because their car started easier on cold mornings. Not like you are fouling plugs out or washing the bore at .85. Probably not even going to make your oil smell gassy.
This has to be the most moronic thing I have ever seen you post.

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Old May 6, 2022 | 01:36 AM
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Originally Posted by LilJayV10
This has to be the most moronic thing I have ever seen you post.
Please be more specific in your critique.
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Old May 6, 2022 | 09:31 AM
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Originally Posted by FCar2000TA
I am not getting any codes for misfires.
I've seen plenty of examples of misfires, not trip codes. Normally if you scan them all and watch, you'll see the difference, then it's a matter of why.

Are you sure the wideband is accurate? I know depending on which brand, some show lean when they are on the way out, and some show rich.

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Old May 6, 2022 | 01:08 PM
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Originally Posted by rpturbo
I've seen plenty of examples of misfires, not trip codes. Normally if you scan them all and watch, you'll see the difference, then it's a matter of why.

Are you sure the wideband is accurate? I know depending on which brand, some show lean when they are on the way out, and some show rich.

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