10/29/2019
Outstanding gains from a Complete Custom Dyno Tune!
In the previous post you saw where this combo Gained 59 whp at 6500 RPM with the supercharger kit and a good mail order tune making 356 whp. With plenty of time and effort we gained ANOTHER 61 whp at 6500 RPM with ONLY a Complete Custom Dyno Tune for a total peak of 410 whp and 410 wtq. More power from our custom dyno tune than from the supercharger install! In the mid range the tune gain was even more impressive. At 4900 RPM the gain from the supercharger was 31 whp and the custom dyno tune gain was 53 whp
While these tuning gains are incredible some things keeping all the whp numbers from being higher are a Heavy duty truck Tq converter with higher stall, Smog legal quiet exhaust, quiet stock air box, SAE correction factors, and did I mention the boost was only 5 psi? That's right, total boost before and after the tune was only 5 psi. All these pulls were done in 2nd gear due to the driveshaft rpm limit preventing full pulls in the 1:1 ratio 3rd gear. 3rd gear would show another ~20 whp and tq on these 410 whp pulls.
Some Street Drivability tuning also got rid of some annoying shift patterns and an intake whistle at Hwy cruise while allowing the fuel economy improvements to be dialed in.
Wayne wanted a truck that Chevy has been teasing Truck guys with for many years. Chevy never built the Regular Cab Short Bed SS truck that came with few options, the most powerful LS based truck engine, and an entry level price point. Instead they offered a high dollar AWD extended cab fully optioned SS truck that was heavy. Wayne's RCSB truck has the comforts of a Silverado and with the quiet and smog legal exhaust upgrades, tiny camshaft, and Magnusson Supercharger it has more power than GM would have ever offered in their bare bones SS concept.
Now Wayne has 550 Hp and 550 Tq at the crank with stock drivability and all the options he wants for much less money and better MPG than any new truck.
After driving this truck for a couple of weeks He called to give me a report. His only words were... "It's Perfect, I will be coming back for the next power increase in the Springtime "
On the next Visit we will pulley up some more boost with custom dyno tuning for another awesome Power gain while keeping all the quietness, stockness, drivability and MPG that Wayne calls Perfect.
