Hello, everybody. Many of you asked for flow data on our throttle bodies, and we listened. You wanted numbers to replace words and you've got them. Here we go.
This test is fairly simple and very effective, it says a lot about a valve, about how air is allowed into the manifold/engine and how much of it you get. It is done by using an airflow bench (a large airflow meter) applying a controlled vacuum at the outlet of the TB just like the manifold does. Air is then drawn into the throttle body through its inlet, we fix the throttle position (blade position) and take a measurement of how much air is being drawn. We do that about 50 times, one every 1-2% of throttle opening, starting when fully closed until it is fully open and we build a flow curve that characterizes the TB. We do all that for the stock TB and for the our Modified ones, and then compare them.
Test set up. Figures 1-3 show the flow bench, fixtures, the test sample, and a velocity stack.
Results. Figures 4 and 5 show what happens when you go from your stock 87mm TB (6.2L trucks) to our 100mm TB.