Why still no dive acceleration difference?

[JtD]

Originally Posted by BlackBerry

This test is probably a shallow dive(30 degree), in my opinion, if dive in 45-60 degree, P51D will get much more advantage.

Accelerating from 200 to 325 the difference will be mostly the same, if diving for 27 s the difference will be bigger. However, in a steeper dive the limiting speed of 325 IAS will be reached sooner, therefore you'll be diving for less than 27 s, and separation will be smaller.