I just purchased a 2011 Silverado with a 6.2L and I'm working on the tune on it. I had a question about the VVT. On the 5.3Ls, I usually delete it as the tq gain is nice at part throttle and stops the sudden feeling of increased torque. However, with the 6.2L, is it better for mpg and performance to keep it stock, modified, or totally deleted. Right now, I'm running deleted and the torque pickup is great but just wondering for a little less torque if mpg wouldn't pickup just a hair.

Thanks!

 

The torque pick up is great because they retard the hell out of it while cruising to help your MPG.

You will feel a real nice difference in low RPM tip in, but I would think you sacrifice top end power in a meaningful way as the default setting is fully advanced if in not mistaken... they retard it for 2 reasons, MPG and top a more broad power curve while attaining that mileage (really just 1 reason as a non VVT cam could easily perform up top in the same way or better... hence why LS3 is not vvt). Put it this way... GM wouldn't use that cam without VVT because its far from ideal.

If its simply the bottom end power you want then keep it from retarding cam timing while cruising and under light load. You want it advanced as far as possible for bottom end power, and retarded as much as possible for high end power.

Don't be surprised to see MPG decrease by a fair amount if you delete it or make these changes.

 

Well, looking at the tune with HP Tuners....the cam is all advanced even up top. The cruising cells are advanced about 10-20* depending on the cells and the top end is advanced 1-3*.

Well, the next question becomes...which is better to mess with in order to get the best of everything torque and mpg....the Cam intake variable settings or the spark table variable table. Exhaust settings are all set to 0.

 

I guess when i say they retard it I meant from the full advanced position. So at 1* of advance they have retarded it 19* compared to its max of 20.