Hey All,
I'm looking for a very choppy idle but when I lower my timing/idle/overspeed settings, exhaust poping after 2400rpm in between shifts. Let me know what you guys think.
P.s Car made 607/533 dyno jet
Thanks.
Hey All,
I'm looking for a very choppy idle but when I lower my timing/idle/overspeed settings, exhaust poping after 2400rpm in between shifts. Let me know what you guys think.
P.s Car made 607/533 dyno jet
Thanks.
Last edited by z0sleeper; 05-08-2012 at 08:05 PM.
wow really nobody knows?
Need a bit more specific description. The exhaust pops between shifts? Sounds like DFCO or a lean issue.
Gray Ghost- The abomination. 2007 Chevrolet Silverado CCSB. 98mm turbo, nitrous, 428LSX, Rossler 80E with a brake. Finally finished. 23 psi, no numbers, Slow as hell.
PBM G8- Aluminum 364, twin Precision 67/66 turbos, 6L90 trans swap, CTS-V/Vaporworx fuel system, slowly making progress.
Dads 2011 CTS-V- Stock bottom end, stock heads, LS9 cam, pullies, ported blower, ported TB, D3 goodies, and lots of nitrous.
618/618 motor
906/862 spray
Caterpillar 50 Forklift- Duramax swap
under normal driving anything higher then 1500rpm backfire/minor poping sound. Do you see anything wrong with my file? Should I data log it?
Thanks
Gray Ghost- The abomination. 2007 Chevrolet Silverado CCSB. 98mm turbo, nitrous, 428LSX, Rossler 80E with a brake. Finally finished. 23 psi, no numbers, Slow as hell.
PBM G8- Aluminum 364, twin Precision 67/66 turbos, 6L90 trans swap, CTS-V/Vaporworx fuel system, slowly making progress.
Dads 2011 CTS-V- Stock bottom end, stock heads, LS9 cam, pullies, ported blower, ported TB, D3 goodies, and lots of nitrous.
618/618 motor
906/862 spray
Caterpillar 50 Forklift- Duramax swap
This seems to only happen when car warms up, can I try enable 2500rpm and disable 1200?
Yep you can try that. If it still does it, the problem is clutch fuel cutoff. P.S. I would not leave the rev limit at 7,400 rpm. That's too fast even for LS7 lifters. About 7,200 is max.
Gray Ghost- The abomination. 2007 Chevrolet Silverado CCSB. 98mm turbo, nitrous, 428LSX, Rossler 80E with a brake. Finally finished. 23 psi, no numbers, Slow as hell.
PBM G8- Aluminum 364, twin Precision 67/66 turbos, 6L90 trans swap, CTS-V/Vaporworx fuel system, slowly making progress.
Dads 2011 CTS-V- Stock bottom end, stock heads, LS9 cam, pullies, ported blower, ported TB, D3 goodies, and lots of nitrous.
618/618 motor
906/862 spray
Caterpillar 50 Forklift- Duramax swap
Gray Ghost- The abomination. 2007 Chevrolet Silverado CCSB. 98mm turbo, nitrous, 428LSX, Rossler 80E with a brake. Finally finished. 23 psi, no numbers, Slow as hell.
PBM G8- Aluminum 364, twin Precision 67/66 turbos, 6L90 trans swap, CTS-V/Vaporworx fuel system, slowly making progress.
Dads 2011 CTS-V- Stock bottom end, stock heads, LS9 cam, pullies, ported blower, ported TB, D3 goodies, and lots of nitrous.
618/618 motor
906/862 spray
Caterpillar 50 Forklift- Duramax swap
I did a shut down log today tps goes from 18% to 28% on it own.
Gray Ghost- The abomination. 2007 Chevrolet Silverado CCSB. 98mm turbo, nitrous, 428LSX, Rossler 80E with a brake. Finally finished. 23 psi, no numbers, Slow as hell.
PBM G8- Aluminum 364, twin Precision 67/66 turbos, 6L90 trans swap, CTS-V/Vaporworx fuel system, slowly making progress.
Dads 2011 CTS-V- Stock bottom end, stock heads, LS9 cam, pullies, ported blower, ported TB, D3 goodies, and lots of nitrous.
618/618 motor
906/862 spray
Caterpillar 50 Forklift- Duramax swap
Is there a way to decrease DFCO rate? I'd like to reduce it a bit, if possible. I'm not a big fan of popping every time I lift the throttle. My AFR jumps to 21 when it engages. That seams a bit too aggressive to me.
When arguing with an idiot, make sure he isn't doing the same thing....
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I have found most dieseling is caused by wrong injector data. I have a procharged c6z in the shop right now that had 85lb fast injectors which I don't personally have the data for. The car was extremely hard to start and when you shut it off it would keep running for a good 5 seconds. Put a set of stock injectors in it fired the car up nearly like stock and shut off like stock. So with that said getting the fuel shut off when the engine is supposed to shut off is key to keep it from dieseling. The gen4 stuff seems like they are more touchy on that than older gen3 stuff.
I ordered some 80lb Siemens injectors for this car just because I know the data on them and the QC seems much better on them than the junk EV14 FAST injectors. I don't think the particular FAST injectors we had ever actually closed when pressure was on them. They seemed to leak down pretty bad.
Last edited by LSxpwrdZ; 06-17-2012 at 03:50 PM.
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ARH 1 7/8 headers,
1009 RWHP @ 7000, 817 RWT @ 6000
ZR1 DFCO timing tables cure it...they're even higher. I put in the numbers from the ZR1 and I have literally no popping at all in DFCO.
Whoever said his AFR is going to 21 and that's too agressive...that's just what your wideband maxes at...your AFR is going to just air when you're in DFCO. The injectors turn off. The popping noise is residual fuel blowing up in the pipes because there's not enough spark advance to light it off in the chambers...or it's crappy injectors not closing well...either way, with enough timing, it'll all happen in the chamber and you won't hear the popping.
2010 Camaro SS M6. Stock Bottom End, Heads/Cam/Intake/Headers/Exhaust.
2005 Silverado RCSB. Forged 370 LQ9/Borg-Forced Inductions T6 S484/Jake's Stage 4 4L80E with D3 Brake/4WD.
2023 Durango Hellcat
EFI specialist
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Ya, I understand what's happening. I just didn't know it was a complete shut off.
I understand the DFCO entry tables, but the exit tables are confusing. Mine (stock tune settings) are all negative from 0 RPM to 3072, then 0's the rest of the way. -10, -10, -10, -8.5, -5.5, -3, -1.5
DFCO entry was +10 across the entire RPM range. I moved these to +18 and there is less popping, but I still have some.
For DFCO exit, do I want to move those numbers to +15 - or so??
When arguing with an idiot, make sure he isn't doing the same thing....
EFI specialist
Advanced diagnostics, tuning, emissions
HPtuners dealer and tech support
email=[email protected]