True dual or single straight pipe?

[CDW6212R]

I's not just the A/F ratio, loss of power from too big a pipe happened before computer controlled engines.
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Sorry, wrong again, you are talking about very common knowledge from back then, when the A/F ratio was upset by increasing airflow, making the engine lean. It's the same thing.

It's the identical situation, except one is fuel controlled by a computer, and the older engine by a carburetor. A carb is not perfect in the same way the PCM is not, they cannot control the A/F ratio perfectly based on any random airflow. They are both "tuned" for a specific airflow they are intended to experience. When the airflow is increased enough, the result is a too lean mixture, which is "felt" as less power.

Go find any top mechanics that know carbs. Ask them what happens to the A/F ratio when you install a much larger header than the stock manifold. They will all tell you that the carb must be rejetted with bigger jets(to fix the lean condition). The same thing happens with a much bigger exhaust on a car with a carb. The airflow increases enough to make it run too lean, and the answer is more fuel.

Every airflow change you make, alters the A/F ratio from insignificant, to an amount you can feel. Fix the A/F ratio, and the result will be more power, matching the greater airflow. Regards,

 

[CDW6212R]

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When the pipe is too big the gas starts to slow down and cool down.
This causes turbulence inside the pipe interfering with gas flow.

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There is no measurable turbulence created downstream from the cats/pan area, no matter how big of pipes may be used. The only thing "seen" from the engine/header/collector area is back pressure, and that is restriction which reduces airflow from the engine.

Concentrate solely on engine airflow, and the proper A/F ratio needed. Ignore velocity etc, past the collectors.

 

[jester1023]

Sent you a pm. I have the audio recordings of the stock OHV vs one with a Flowmaster and 2 1/4". I don't know if I can post audio straight from my iPhone in this thread, but would be glad to text the difference to anyone that wants to hear. PM me if interested.