hebert2756

I have a 2007 silverado with the 6.0 vortex max and it has a very bad hesitation when I try to accelerate fast from stop or slow speed. I have had this back at gm and they tell me there is no problem. I was woundering if ther is anyone else out there with the same problem? After I get up to speed it will run like a scaled rabbit. I turn off the traction control and still have this problem. The reason I am trying to figure this out is I pull a very large boat and when you need to go from a stop real fast you need it to go. the hesitaion is real bad pulling or empty. Any help would greatly be appreciated. I have expired all other resources trying to figure this out, but I don't know anyone with a vortex max. Thanks

rps2002

I've noticed the same issue with mine. It's usually worse when the engine is cold, but it goes away after running for a little while. Not sure what the problem is.

tahoe07

Here is a small excerpt from the entire thread but this is probably the issue...

Although the spike resulted in a peak of 297 hp at the wheels — about right for the rated 367 hp at the flywheel, once drivetrain loss is factored in — the Silverado's measured power appeared to be underachieving everywhere else in the rev range.
In fact, the Chevy produces significantly less power than the Titan for the duration of the dyno test until the Chevy finally surpasses the Titan's peak of 291 hp at the wheels.
As it turns out, the explanation boils down to an engine calibration strategy. GM calibrated the 367-hp 6.0-liter V8 to remain in stoichiometric "closed-loop" fuel delivery mode for 4 seconds after the throttle is floored. This fueling strategy helps keep emissions in check (and saves fuel) at the expense of reduced power — about 40 hp less at the peak. Once the driver lifts his right foot from the wide-open throttle position, the 4-second clock resets.
This explains why the Silverado's power is low everywhere on the graph right up to the jump in power right before redline. Corresponding to the expiration of the 4-second window, the jump in power is indicative of the engine switching to open-loop "power enrichment" mode. It is only when operating in this mode that the engine delivers its full rated power.

Entire thread here...

http://chevytruckworld.tenmagazines....on_observed_hp

Old Coot

Thanks for the link. A veryinformative article. Since I not racing mine I think I'll stay with the better mpg.

hebert2756

wow that astounding. Thanks for the info, now I know. Is there a programer out there that I could buy to get around that problem?

hebert2756

Is there a programer that anyone knows about that I could buy to solve this problem?

07max

Check out the new Edge Programmer for the 2007 NBS trucks. There are some GREAT reviews about fixing exactly what you are experiencing. Oh and adding almost 50HP to the MAX with super. My '07 does the same thing. Something called Torque Management.

-Steve

hebert2756

I am new to this fourm and I want to thank everyone for thier help.