Six pack secondary paper clip test?
Look at the rpm where the horsepower increases over the black spring. First with a plain spring and then with a yellow spring.
Wide open throttle begins between 3750 and 4000 rpm.
Based on this data and also the manifold vacuum and Innovate WBO2, I don't beleive the secondaries were significantly contributing to airflow with the black spring until the engine exceeded 5200 rpm.
Here's two runs on the datalogger with the black spring installed. You can see the manifld vacuum continues to rise all the way to 2"Hg or so.
The sudden drop in AFR (goes richer) of the mixture around 5200 was when the secondaries were opening.
We can see the AFR move down in rpm with the plain and yellow springs.
Wide open throttle begins around 3800 rpm.
Thats about as low of an rpm as can generally be done on a chassis dyno with an automatic (lacking full manual valve body)
Ignore the AFR tuning issues being worked on at the time.
Look at the rpm where the horsepower increases over the black spring. First with a plain spring and then with a yellow spring.
Wide open throttle begins between 3750 and 4000 rpm.
Based on this data and also the manifold vacuum and Innovate WBO2, I don't beleive the secondaries were significantly contributing to airflow with the black spring until the engine exceeded 5200 rpm.
Here's two runs on the datalogger with the black spring installed. You can see the manifld vacuum continues to rise all the way to 2"Hg or so.
The sudden drop in AFR (goes richer) of the mixture around 5200 was when the secondaries were opening.
We can see the AFR move down in rpm with the plain and yellow springs.
Wide open throttle begins around 3800 rpm.
Thats about as low of an rpm as can generally be done on a chassis dyno with an automatic (lacking full manual valve body)
