Today we dyno'd the 2012 GMC Sierra. Those of you following know that we swapped the 4.3 v6 for a 6.2 v8. There are two graphs below. The first graph is a comparison of the power curve leaving the VVT fully advanced vs commanding the camshaft to retard 4 degrees at 5200 RPM (NOTE: HP Tuners said the actual was closer to 5 degrees). As you can see, the VVT really helps the power carry. In fact, the power barely fell off as the RPMs rose past 6600 RPM. The engine made over 400 RWHP from 5500 RPM until the end of the pull. I don't doubt that it would have made it to 6700 or even 6800 RPM before starting to fall off. The nicely massaged Frankenstein Engine Dynamics LLC 823 heads were no doubt doing their part. That is a lot of RPM for a camshaft with these specs: 214/224 113.5+8 .553" valve lift.
The 2nd graph is all of the pulls. Without smoothing the best pull was 410 RWHP / 390 RWTQ. Smoothing knocked the numbers down a couple. All pulls were made in 2nd gear. Point of interest: removing the stock paper air filter was worth 2 hp. The goal was to add big v8 power while having the truck still drive like stock. I am very pleased with the results.
Details of the truck:
2012 GMC Sierra RCSB W/T
6.2 L94 from a 2014 Caddy Escalade
DOD Delete
Cam Motion 214/224 113.5+8 .553" valve lift custom camshaft spec'd by Camshaft Steve ( me :) )
FED CNC 823 head (Their Torq-R CNC program)
1 7/8 headers with 3.5" single exhaust and Walker Dynomax Super Turbo muffler #17789
RPM Level 6 4L60E
FTI 2600 RPM Billet Cover Torque Converter
3.23 gear (getting 4.10s later)
Tuned by Dr.Tuneemall Nate Kuhle
Special Thanks to Joseph Potak for wiring diagram help.
All parts purchased from Robert Biancaniello at NK Performance and Racing
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