2010 Camaro 427 LS3 KB supercharger - Cutting out problems

[EZ SPEED]

2010 Camaro 427 stroker LS3 , Kenne Bell Supercharger @12 psi. , 6L80E auto,

Here is a log of the problem that I am having. The car cuts out really bad when you have been idling then try to rev it quickly. Its almost like a cough, spit, sputter.
Its been a couple of years since I did any in depth tuning so I really need some help with this one.
I hope that I am giving enough information ...if not please just ask whatever you might need to know to help.

Thanks in advance for any help or insight into my problem.

Eric
o2 strange cutout when given throttle.hpl

[edcmat-l1]

Post the tune too. FYI the KBs have some idle issues on those cars. Must be a bypass issue because the Whipples don't do the same thing.

[EZ SPEED]

Post the tune too. FYI the KBs have some idle issues on those cars. Must be a bypass issue because the Whipples don't do the same thing.

I will post the tune when i get home this afternoon

[EZ SPEED]

Here is my tune

[edcmat-l1]

Looks like it doesn't have enough idle airflow, judging by the log and the tune. Might also consider dialing in the VE. Put a ZR1 MAP in it and dial in the VE. Might wanna idle it a little higher too. Add 50 rpm to it. Don't know what your cam specs are but just the added load of the SC could use a little more idle RPM.

[EZ SPEED]

Doesnt something look funny on my datalog with my o2's to you?
Also.... its REALLY bad when you rev it from idle...its spits back badly...kind of like an old carburated car that backfires thru the carb.
I have a few car shows coming up soon and really need to fique this problem out, the car is almost undrivable when it starts acting up

[SultanHassanMasTuning]

looking at your logs, it seems like there is a malfunction in one of your o2 sensors. your B2S1 is not switching (i think you have a bad sensor)

also i would change your accel ratio under Transient,

[edcmat-l1]

One of the O2s looks very lazy. But that's not causing the backfire when you snap the throttle, and it most likely isn't causing or even contributing to the stalling. So, do you want to focus on the lazy O2, or do you want to fix the other problems? Once tuned properly, it should run just fine in open loop, with NO O2 feedback.

So, if you want to cure the tip in stumble/backfire, then tune the VE. The MAF can't read rapid changes in manifold vacuum, or even accurately interpret rapid changes in airflow. The VE can. What you're feeling/hearing is lean tip in.

If you want to fix the stalling, then start by adding some idle airflow to it. Look at your data while it's idling. Your MAF is showing 13-16 g/sec of airflow, and you've got 10.50-12 g/sec in your table. Also, try raising the idle speed by 50 rpm.

If you want to chase your O2 problem, that's fine, but it's not going to cure the issues you're wanting it to cure.

[10_SS]

One of the O2s looks very lazy. But that's not causing the backfire when you snap the throttle, and it most likely isn't causing or even contributing to the stalling. So, do you want to focus on the lazy O2, or do you want to fix the other problems? Once tuned properly, it should run just fine in open loop, with NO O2 feedback.

So, if you want to cure the tip in stumble/backfire, then tune the VE. The MAF can't read rapid changes in manifold vacuum, or even accurately interpret rapid changes in airflow. The VE can. What you're feeling/hearing is lean tip in.

If you want to fix the stalling, then start by adding some idle airflow to it. Look at your data while it's idling. Your MAF is showing 13-16 g/sec of airflow, and you've got 10.50-12 g/sec in your table. Also, try raising the idle speed by 50 rpm.

If you want to chase your O2 problem, that's fine, but it's not going to cure the issues you're wanting it to cure.

edcmat-l1 is right about the VE tables, mine (and most people's) wont even run in pure MAF mode without a somewhat accurate VE table so that tells you the VE tables are definitely referenced.

Once you figure all these problems out, or even maybe before you attempt to fix them, you may want to reduce your Throttle Area Opening Rate just a bit, though you will probably have to lower it to below 10 (from 100) for any noticeable change. I'm at 3 and it still opens plenty fast. I did this since the Whipple tends to blow massive buildup of pressure and airflow at WOT tip in between shifts on my manual trans car and there's no need for this... I was getting massive MAP pressure and MAF flow spikes with higher RPM and hitting the throttle fast... all fixed by changing a few values in software. Your automatic would benefit from a slightly slower opening rate as well I'm sure. I think anybody with these manifold mounted blowers should do this.

[EZ SPEED]

Thanks for all the help and advice guys!!
Cant wait to get home from work and make the changes yall have suggested.
Also....I just ordered a ZR1 MAP and a new o2 sensor.

Ohhhh...one more question... could I have screwed things up when I moved my MAP sensor about 2.5 feet further from the engine when I did a lot of relocating and moving stuff around in the engine compartment for a cleaner look?

[edcmat-l1]

Map sensor needs to be as close as possible to the intake, preferably IN the intake. The further away you have it the slower it responds to sudden changes in pressure.

[EZ SPEED]

Map sensor needs to be as close as possible to the intake, preferably IN the intake. The further away you have it the slower it responds to sudden changes in pressure.

Cool. thanks for the info

[YellowSS]

Did you ever find the problem? Mine is similar.. to I have and idle that hangs and at wide open my O2s are lazy and the injectors are commanding 100% duty cycle. when I plug a tech 2 scanner in and not data logging with HP tuner it corrects it self for a day or 2 then back to same problem.

[Pekka_Perkeles]

Did you ever find the problem? Mine is similar.. to I have and idle that hangs and at wide open my O2s are lazy and the injectors are commanding 100% duty cycle. when I plug a tech 2 scanner in and not data logging with HP tuner it corrects it self for a day or 2 then back to same problem.

Post your tune and log. Or more preferably, make a new thread.