Decel Popping - ModernCamaro.com - 5th Generation Camaro Enthusiasts
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post #1 of 22 Old 01-20-2010, 12:01 PM Thread Starter
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Decel Popping

I was curious if anyone knows what the actual parameter is called that controls the decel popping sound on our camaros.

for those of you that have tuned this out, what percentage did you set it to that suited you?

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post #2 of 22 Old 01-20-2010, 12:33 PM
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There's a setting for that?

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post #3 of 22 Old 01-20-2010, 12:40 PM Thread Starter
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apparently there is. i've heard of people tuning it out, and i google searched it, a lot of harley davidson forums popped up and they have a parameter called deceleration enrichment that regulates the fuel when you let off the gas... you can adjust it from 0% to 100%, 0 being no fuel being sent and 100% being what the fuel delivery was prior to letting off the throttle.

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post #4 of 22 Old 01-20-2010, 12:47 PM
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Originally Posted by RedJewel2SS View Post
apparently there is. i've heard of people tuning it out, and i google searched it, a lot of harley davidson forums popped up and they have a parameter called deceleration enrichment that regulates the fuel when you let off the gas... you can adjust it from 0% to 100%, 0 being no fuel being sent and 100% being what the fuel delivery was prior to letting off the throttle.
not sure what it's called, but I'm gonna have mine adjusted in the spring. I don't mind a little of it, but it's too loud w/ headers.

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post #5 of 22 Old 01-20-2010, 12:51 PM Thread Starter
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i've been emailing back and forth with my tuner... he says there isn't a parameter for decel enrichment.

he said to control the popping, you can add timing to the lower rpm range to burn the unspent fuel that causes the popping. whatever that means

i told him as long as it doesn't hinder my performance, doesn't blow up my engine, and quiets the popping then he can do as he wishes to solve the problem!

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post #6 of 22 Old 01-20-2010, 01:07 PM
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Originally Posted by RedJewel2SS View Post
i've been emailing back and forth with my tuner... he says there isn't a parameter for decel enrichment.

he said to control the popping, you can add timing to the lower rpm range to burn the unspent fuel that causes the popping. whatever that means

i told him as long as it doesn't hinder my performance, doesn't blow up my engine, and quiets the popping then he can do as he wishes to solve the problem!

hmmm, might depend on the tuning software. If I talk to my tuner I'll ask him.

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post #7 of 22 Old 01-20-2010, 01:27 PM Thread Starter
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hmmm, might depend on the tuning software. If I talk to my tuner I'll ask him.
might be... i'm using a DiabloSport handheld, and the custom tune is through their "CMR Tuning Software"

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post #8 of 22 Old 01-23-2010, 11:29 PM
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The parameter is called DFCO, decel fuel cut off. It has a ton of settings to help this......
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post #9 of 22 Old 01-24-2010, 08:48 PM Thread Starter
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i installed a new tune friday that had the "coast down timing" adjusted as my tuner called it... it seemed to work! now when ever i let off the throttle from any RPM the engine sound is a lot smoother as the engine is slowing down. pretty interesting!

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post #10 of 22 Old 03-10-2010, 07:25 PM
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yeah.. you don't want to adjust the DFCO parameters for decel popping... you lose performance and also hurt your mileage...

you want to increase the timing in the Coast Down Spark timing table instead... this fixes the popping issue, and you don't lose any performance or mileage...


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