Quote:
Originally Posted by Camaroking98
I have a magnuson 2650 swapped on. I have an 80mm upper and 10.35 lower. How much boost should I be making?
For reference, last time I had a 75mm upper and 9.45 lower that made 16psi in my crappy DA. I was having belt slip though so we decided to go with a bigger upper and lower.
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Your 75mm (2.95”) upper and 9.45 lower was netting you 20,822 RPM blower speed at 6500 RPM and a pulley ratio of 3.20 which is aggressive. I’m not surprised on the belt slip with the stock LT4 tensioner. Your new combo of 80mm (3.15”) upper and 10.35” is even more aggressive at 3.29 ratio and 21,357 RPM blower speed. In my experience, that pulley change won’t fix your problem.
You might want to look at TooHighPSI’s LT5 tensioner and 10-rib upgrade which I run on my combo (18 psi). The LT5 tensioner has more tension and greater travel…just a better piece across the board.
Hope that helps.
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2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, ATI 8L90, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors & BB HPFP, TooHighPSI/Katech port injection, 15” conversion 1066 WHP STD/1027 SAE, 9.10@152.5 (new times coming)