A F-15 does 2.4 easy. A clean F-4 could.
That's a bit shy of Mach 5.
Better UP the power.

My 1/11 scale RC F-4 does a bit better than scale top speed at 150mph.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !