parking lot surge/stall

[04silverado6.0]

It has been tuned open loop wideband its whole life. I have some nice ballenger widebands with the ntk cal grade sensor but it is easier to use the mounted 30-0300 with a pro link shoved in the fuse block on the driver side dash. From 1200 down it is hard to hit many ve cells since it sort of passes through. I could lock the converter and lock the dyno at 1200 and make a run but its not going to make vacuum to hit lower cells. I have tuned a ton of these cams in 5.3s without issue and one in a 6.2 that ran awesome. You would think the extra bore and compression would make this act well vs the lm7. Anyone wanting a cam in a full size 6.2 4x4 this is it. That truck would pull a house from 2000+ tapering off in the high 5000 rpm range with the stock converter.

[04silverado6.0]

I do agree the ve needs some shaping at low rpm but i do not seem to be hitting the areas that look like they need shaping.

[SiriusC1024]

I do agree the ve needs some shaping at low rpm but i do not seem to be hitting the areas that look like they need shaping.

It does need shaping because the trims are inconsistent. First the inconsistency needs corrected as mentioned. Then do the VE. Then remove rolling idle and use throttle follower and cracker. Underspeed spark is too low, too.

[edcmat-l1]

Was there ever a second data log posted with the additional pids?

[04silverado6.0]

Not drove the truck yet. I have to say i have tried the majority of these suggestions at different times in the last 3 years. The only thing i see that i would attempt is the ve changes and also ltft.

[SiriusC1024]

After those changes log Dynamic Airflow. Watch for large differences between it and MAF.

[edcmat-l1]

Not drove the truck yet. I have to say i have tried the majority of these suggestions at different times in the last 3 years. The only thing i see that i would attempt is the ve changes and also ltft.

You may have tried some random changes that have been mentioned here but you haven't set it up properly by any means. It's kind of a mess. Not just the VE but the throttle cracker is whacked. The rolling idle isn't setup correctly. You aren't logging the proper pids so you can't know what to add where, what to change, etc. You can randomly peck at your keyboard all day long but that's not "progress".

[04silverado6.0]

Im not sure how the throttle cracker is my issue. The issue im having is below throttle cracker speeds or when its turning off. I havent randomly tapped at my keyboard. Im starting to think this is a issue with the maf and not the tune. I had a ls3 car in last year with a fast 102 that was having velocity issues with the maf reading air but less velocity actually hitting the plenum caused by the step in throttle body to intake inlet size. If that is the case then there is no explanation on why it did this with the stock 3 bolt intake.

[04silverado6.0]

I am running a airaid mit on the stock box. Has anyone had issues with those tubes?

[04silverado6.0]

No issues on this one. Having trouble getting up to temp with the cold weather.

[04silverado6.0]

Managed to get a few dips in rpm as it came up to temp.

[04silverado6.0]

3rd log

[bk2life]

Having trouble getting up to temp with the cold weather.

cardboard covering the radiator will help

[04silverado6.0]

I got a champion radiator and probably a pinched stat seal.

[SiriusC1024]

The log looks the same. You didn't try any suggestions not even to test. Takes like 2 minutes to change and 10 to log.

Logging Dynair will answer if it's the MAF. Fixing O2 settings will make fueling more accurate.

All that was changed was throttle follower. Of course that's not going to fix it on its own. It's fix O2's, idle over/under, retune SD and MAF, then move onto throttle cracker and follower.

There is definitely a problem. I know this because it's been bandaided with rolling idle. Above is the the correct order of operations.

[04silverado6.0]

Looks like i have some lean areas to work on. Probably left over from the heat soak and dyno tuning.

[04silverado6.0]

Went back over the ve, ran excellent in ol sd. Switched back to maf to confirm the dyn air and maf are way off when the rpm drop happens. Maf and dyn air seem to be nearly dead nuts any other time, only showing a difference during the dip. I think i will just run the truck sd cl and forget the maf.

[SiriusC1024]

May I work on it with you?

[04silverado6.0]

Truck is running awesome. Much more response and no parking lot issues. I will continue to work the braf and ve as i get more time. I tune all customers vehicles sd so that may be why ive not had any trouble with this cam on other engines. Thanks to all who helped.

[SiriusC1024]

Just something to try if you want to retain hybrid dynamic is to set the VE Corr Factor Filter to .0810 and Dynamic Air Filt to .215. Lower MAF Airmass Filt to .095.

This all depends on accurate MAF and VE, which you're getting close.