Can DFCO be used to reduce/eliminate popping sounds from LT headers and a Borla exhaust?
Can has had VE and MAF tuning with AFR dialed in around 12.9:1.
DFCO and Exhaust popping
Can DFCO be used to reduce/eliminate popping sounds from LT headers and a Borla exhaust?
Can has had VE and MAF tuning with AFR dialed in around 12.9:1.
2015 Z06 A8
I find that DFCO cause popping on enable and disable
Andrew
EFILive Crew
What would a solution be?
2015 Z06 A8
Ear plugs.Originally Posted by Chalky
I have some pretty aggressive DFCO settings in my 01 C5, and in my 02 Silverado and it seems to have eliminated the popping I had previously. I've heard Andrew's comment before about popping on enable and/or disable, but that isn't an issue with the vehicles I've messed with. For reference, the C5 has LT headers and 3" high flow cats along with 3" cat-back.
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I think its due to the dfco & or timing ramp in and out. Basically spark will ramp to a very low value meaning charge is ignited just as its heading out the cyinder into the exhaust, rather than at an optimal point.
You can ramp it faster and see what that does I think it helped on mine.
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2007 Escalade ESV L92 6.2L VVT.
2014 VF SV LS3 Maloo.
Any minor exhaust leak will contibute to the popping. Headers, Borlas, resonance and popping are a tough combination.
I have had some exhaust systems that caused serious concern in the neighborhood, but those were too much for me too.
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2000 C5 Coupe, 6M, Callies/Mahle stroked LS7 (441), Blackwing, Halltech, LS3 intake, 90mm Shaner TB, ported L92 heads, FAST 50# inj, not too much cam, Kooks 1 7/8" headers , 3" catless mid pipes, Z TIs, track suspension, , 3:90 rear, EFI V2, LM-2, etc.
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Verify that you're not too lean down low. I was pretty lean in the 15 MAP column so I added a tiney bit of fuel and it's much better now. FWIW I have an open borla and LT's too. It would only pop when I let off the gas after going over around 3k rpm.
Sorry but what table are you referring to? Main VE?
Last edited by Chalky; November 12th, 2006 at 05:27 PM.
2015 Z06 A8
B0101 which is the main ve table.
Gotcha.
I'll give it a try. When I did my VE tune, I kind of blew off tuning the lower columns as I was not seeing any consistent activity below MAP 30/35!
2015 Z06 A8
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