I thought it might be good to chime in here. The best horsepower gain that we measured (+155) occurred at 2000 RPM, from 163 HP stock to 318 with Six-Gun and Speed-Loader set at level 6. The best torque gain occurred at 1800 RPM, from 458 lb-ft stock to 843 lb-ft, a gain of 385 lb-ft. Peak horsepower went from 252 @ 3000 RPM stock to 336 @ 2800 RPM with Six-Gun and Speed-Loader set at level six, a gain of 84 HP. Peak torque both before and after occurred at 1800 RPM, so the numbers are the same as the best gain. We always look at the full curve and present data that shows best gains and peak to peak gains. The curves pretty much tell the full story. You can see them here
http://www.bankspower.com/test_results_AC09.cfm, and more data will be posted at a later date.
Tsckey: The fuel pressure is a definite issue of concern. In stock form the Duramax produces about 23,000 PSI of fuel pressure. Based on extensive testing, we have determined that 26,000 PSI is about the point when seals are in jeopardy. We have designed the Six-Gun so that at all levels except level 6 with the Speed-Loader, the systems does not exceed about 24,000 PSI. Level 6 with the Speed-Loader approaches but does not exceed 26,000 PSI. There are a couple of devices that we have tested that exceeded 28,000 PSI, beyond our comfort level.
Problemchild: We always recommend the use of a pyro because exhaust gas temperature is the most vital statistic that you can know regarding the function of your diesel engine. We also always recommend airflow improvements anytime that you are increasing fuel delivery. For those that like the idea of an adjustable fuel calibration like the Six-Gun, we offer Monster Exhaust, air-filters and gauges, for those that never want to be concerned about the proper matching of air and fuel, we offer our Stinger system, which include a set calibration (no adjustment), 4” exhaust, filter, Big Head wastegate actuator and gauges. The Stinger offers the peace of mind of knowing that you will never overtemp your engine. There is enough margin available in a Duramax that you can probably put a Six-Gun on and run at moderate levels without ever having an overtemp problem, but if you tow, you would need to stay around level 2 or 3 on an otherwise stock truck to stay safe. If you are going to tow, I highly recommend a pyrometer.
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