im looking for a starting point for loader/shoe depth for a Rogers style bottom....
1970 Weiman Cyclone
Berkeley suction housing, Hardened shaft, billet inducer, Bronze Dominator BC impeller, Dominator bowl, American Turbine Droop, regular hydraulic diverter
5.3L LS Engine, makes approx 500 hp NA (Dynoed at 450, but i changed out the heads from stock to trick flow's picked up 300 RPM from this change alone) So guessing 500-515 hp
I have not measured how far the hardware is down below keel. But it is a drastic amount, i would guess atleast .250" . I will measure this weekend (im out of town for work)
But i have the below pictured loader.
When letting off the throttle on my boat, it feels like im dragging an anchor/pulling a parachute. the boat also feels sketchy as hell when on the throttle hard, kind of like a kite sensation... aired out but something holding it back.... fish on a line... hard to explain.
im spinning the BC to 5400 on motor, and 64-6500 on a 150 shot of nitrous. According to my dyno sheet, these numbers are pretty close to the actual hp it is making at that rpm vs the impeller chart.
it leaves pretty darn hard out of the hole, and just stops pulling... the boat gps's out to 77 on motor, and does it in a few seconds. im guessing 800 feet or less (havent done any real nitrous passes to gps)
Kinda like having 4.10's in a car... pulls hard as hell then kind of flattens out...
No i dont have psi taps or anything... The roost looks nice and solid.
My theory is that i'm loading this thing to hard with the loader/shoe that low below keel. Hence the dragging parachute feeling...
Will trimming/bringing my hardware up help? Could this be loading the impeller down so hard that its bringing engine RPM down too?
I'm thinking to trim the loader back to even with the keel, and leave the shoe where it is but i know nothing about tuning this stuff