I don't know how DCOE's compare to ITB's, specifically DCOE style ITB's (same manifold and throttle placement), but the DCOE's are a freaking hoot to drive. I did play around with the linkage angles when I first installed them (lololol at my first attempt!) but it's pretty good now. It's just a very sharp and instant throttle response. so that can be somewhat hard to deal with. The old SU's always had a sort of muted response.
My point exactly that low angle inrush is huge and gives a false impression of power increase, just like over carburation, when in fact there is a loss of torque. The CV has to open that is why SU carbs feel soft.
DCOE's are individual runners, so they behave similar to ITB. And will likely exihbit the same false impression of power due to the snappy response.
I did a lot of R&D on butterfly air valves. I was working with a friend who patented a smooth bore throttle valve. we were focussing on injected dirt car stuff. Many of them needed huge ITB cross sections to not chop the top off the power band. (Due to the air flow disruption of the butterfly valve) And the object was to reduce the size of the runner (360 class limits the intake cross section to stop racers from building stupid high rpm motors that could dominate). His idea was to eliminate the oversized ITB and the air flow loss of the butterfly valve and make more power with an optimized intake port that did not reduce flow and velocity. With a smaller volume it actually flowed more air than the big ITB. It's patented but never went much past the R&D stages. Some big players took a look at it but it never took off, difficult to manufacture. Many are making intake runners now that have moved the butterfly valve up more towards the top of the runner to try and negate some of the flow disruption caused by the butterfly valve.
2 counter rotating rollers with a bite out of each, when rotated to WFO formed a smooth bore opening. It did not have the huge inrush at low throttle angles because the hole started small and opened up as opposed to the butterfly which opens most of the way around the diameter. Many drivers did not like it because it did not have the snappy feel the large inrush causes (even though the dyno proved it made more power) it did not feel more powerful, but on a dry slick track with the slowed response it is much easier to keep the tires under you. A lot better than pulling off a couple of plug wires to soften the motor or backing off the timing.
Dr Frankenstien made slide valves for his motors and wanted to make a intake sliding lengthwise to alter the resonance of the intake.
Then I pointed out that by WHERE you squirted the fuel in could change the weight of the air which effectively changed the resonance (made the intake look shorter)
And he came up with this
You can see there are 4 injectors in a standard location on the motor side of the air valve.
Then he added the stainless line coming off the barrel valve feeding the 4 hoses which feed 4 injectors mounted on the air filter base plate that had J shaped tubes that sprayed fuel into the top of the runner. The brass cylinder between the stainless line and the hoses is a spring loaded check valve that stops fuel flow at lower RPM's, so by shimming or changing the spring you could adjust when the upper nozzles started spraying.
Then USAC got wind of what we were doing and blocked us in the 2010 USAC WEST COAST 360 SPRINT CAR ENGINE RULES
"E. Electronic or timed fuel injection will not be allowed. Only one injector nozzle per cylinder. No down Nozzle Injectors. No injection nozzles drilled directly into head. No computerized injection. Injection throttle body must have one shaft operated round butterfly per cylinder. Slide or barrel injectors will be not allowed."
Frustrating and gratifying at the same time, you know you are making inroads when they start changing rules around what you are doing. Yet it stifles innovation, that is why I like the Midgets, but that is not necessarily a free for all either.
At the Chili Bowl there is no tire rule. Cory Cruiseman came to the race with this. (I think he may have won with it)
So we took that a step farther and put a 15" wheel on the RR of a Midget, they spotted it and told us to take it off, since we were not a politically influential team that Bondio is, we had to comply.