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I recently dyno'd my 2012 GMC Sierra RCSB V8 swapped 2wd pickup. In the attached dyno sheet, there are two curves: One curve is with the VVT locked at full advance and the second is with the VVT commanded to retard 4 degrees at 5200 RPM.
The engine: 80k mile 2014 L94 from a Cadillac Escalade. DOD delete, 823 heads ported and hollow stem intake valves by Frankenstein Engineering Development (their Torq-R CNC program), Cam Motion custom 214/224 113.5+8 with .553" lift, LS3 valve springs, Speed Engineering Headers and 3.5" single exhaust with tailpipe, stock intake, RPM Level 6 4L60 with FTI 2600 11" converter. Tune is by DrTuneEmAll. Vehicle was dyno'd with 3.23 rear axle and the transmission in 2nd gear. The rear axle has been upgraded to 4.10 since then.
The truck was originally a 4.3 V6 that was so slow, I wonder if I could outrun it on foot. Now, with the V8 and 4.10 gears, it is fun to drive. Sometimes I just make excuses to go for a ride.
You can see how retarding the camshaft really extends the RPM of this little truck cam. This is really noticeable during shift recovery, especially the 1-2 shift because the of the gear spread of the 4L60. When you take it to 6600 RPM the truck keeps pulling after the shift whereas if you shift at 6000 RPM it really falls on its face when it hits 2nd.
I was surprised by the lope. With negative 8 degrees of overlap, I thought it wouldn't. Once in gear or with the a/c on, it is smooth.
If the cam is in parked position at idle, then it'll give it a more aggressive idle, since it opens 1.5 degrees BTDC @ .050" . I bet it if was advanced 4 degrees in the idle zone, then it'd sound a little tamer.
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VVT Truck Cam Dyno Results 6.2 L94 V8 
Now, with the V8 and 4.10 gears, it is fun to drive. Sometimes I just make excuses to go for a ride. 
