Emissions 40's vs Classic 45's
I posted several AFR curves while I was tuning my 40DCOE116/117's and they had an S shape. I have swapped them out for a pair of 45DCOE152's and here are comparison curves of WOT runs in 3rd gear. The black one is the best torque/HP with the emissions carbs. The brown one is with the 45's with 150 MJ/200 AC/F16 ET and stock accelerator jets. The red one is the same setup as the brown but with "0" accelerator pump bleed back valves. The difference in the shape of the curves is striking. I made no other changes to the engine.
76 Suzuki GT500
2011 Jaguar XKR
A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke