Camaro SS 2010 LS3 stroker with Comp cams Missfire

[Garrett]

Hi guys, I have a Camaro SS 2010 with those parts inside

Comp camps camshaft 146-458-11
Summit Crank 4.00 58x 180LS400058x
JE Pistons 360772
ACB Lifter E52 J2079
Comp cams valve retainers 177916
Comp Cams valves locator 469516
Comp Cams valves lock 62316
Comp cams valve Springs 2626916
Trickflow VVT delete 30678504 ( I don't understand why, but the read file from the car was already with VVT disabled, but the car had VVT parts on before the engine build)
Manley rods 14051R-8
Sparks are NGK TR7EIX gap 0.34" for begining dyno tuning.


ISSUE
I have a lot of multiple missfire on all cylinders, I reduced a lot knock sensivity, otherwise ECU pull timing a lot.
Missfire CEL came on at really rare time
no other CEL came ON


AFR is about 0.84lambda (12.3 WOT)
fuel is fresh from gaz station.
I don't have any trace of knock on plugs, and I never heard any pre-ignition

thanks for help
run21 missfire new spark cable.hpl
run21.hpt

[danmw2003]

I would start with a hotter plug. TR7 is likely too cold of a plug for initial tuning. You probably will never need a TR7plug unless your hitting it with nitrous or boosting it. Just my opinion though...

[cadillactech]

You aren't logging any misfire parameters. Does it set a P0300 or a specific cylinder? If you log all misfires for each cylinder, is it all over the place or is the misfire on a certain cylinder(s)?

What speed and load are you misfiring at?

Is the rest of the valve train stock?

[kevin87turbot]

You'll have to desensitize the misfire detection quite a bit with a cam of that size.
I noticed that you've increased the target idle speed, but haven't increased the min airflow.
Here are a few pointers that will help get it going.
Change the cylinder vol to represent the larger displacement, then follow these steps.

1. Go to Engine>Airflow>Dynamic tab and lower the High rpm disable/re-enable to 400/300 respectively.
2. Go to Engine>Idle>Airflow tables and add 5 gms/sec to the Airflow Final Min table
3. Go to Engine>Idle>Airflow and increase the startup airflow by 25%.
4. Go to Engine Diag>Airflow tab and change Min ECT for P0101 to 256, and change Airflow Correlation RPM from 800 to 8000.
5. Go to Engine Diag>Misfire tab and change Min misfire detection enable to 2500 rpm.

[Garrett]

You'll have to desensitize the misfire detection quite a bit with a cam of that size.
I noticed that you've increased the target idle speed, but haven't increased the min airflow.
Here are a few pointers that will help get it going.
Change the cylinder vol to represent the larger displacement, then follow these steps.

1. Go to Engine>Airflow>Dynamic tab and lower the High rpm disable/re-enable to 400/300 respectively.
2. Go to Engine>Idle>Airflow tables and add 5 gms/sec to the Airflow Final Min table
3. Go to Engine>Idle>Airflow and increase the startup airflow by 25%.
4. Go to Engine Diag>Airflow tab and change Min ECT for P0101 to 256, and change Airflow Correlation RPM from 800 to 8000.
5. Go to Engine Diag>Misfire tab and change Min misfire detection enable to 2500 rpm.

Thanks a lot for advices

1. 400/300 I have a warning from the software : Your entered value exceeds the min/max limits. A value outside limite can cause unpredictable resultas and may posibly put your module in an unrecoverable stable. IF you believe the minx/max limits are in error, please contact support. Would you like to overide the predefined limits for this parameter? yes/NO

2,3,4,5 are modify now thanks

[kevin87turbot]

Thanks a lot for advices

1. 400/300 I have a warning from the software : Your entered value exceeds the min/max limits. A value outside limite can cause unpredictable resultas and may posibly put your module in an unrecoverable stable. IF you believe the minx/max limits are in error, please contact support. Would you like to overide the predefined limits for this parameter? yes/NO

2,3,4,5 are modify now thanks

Make sure that you're changing the correct parameters and that the units are in RPM.
See the pic below.

Dynamic Air Parameters.jpg

[Garrett]

Make sure that you're changing the correct parameters and that the units are in RPM.
See the pic below.

Dynamic Air Parameters.jpg

you are a good one, units wasn't good
it's finenow

[Garrett]

I give the engine tech, installer and builder some guidelines

-Ground
-power cable
-....


The ground behing the driver side cylinder head wasn't tight

I pulled 457whp STD on dynojet

stock intake manifold
stock throttle body
stock exhaust manifold
stock catback


thanks a lot everyone