4.6 to 5.4 swap? BILL....HELP!!!

RobbyMartin · #1 Mon, December 21st, 2009, 09:20 PM

I just read an article and "Power Improved Heads" are what gave these engines the extra HP and TQ starting in '99. I am glad I turned down the '97 engine and opted for a later model.

http://www.mustangandfords.com/techa...ord_modular_v8

***Power Hungry*** · #2 Tue, December 22nd, 2009, 12:33 PM

As you've discovered, there are minor differences in the engines from a performance standpoint and this is where some of the power gains come from as the years progressed. Tuning plays a small part in this as well, but not nearly as much as you'd think. This is why we are still able to achieve reasonable power gains over successive years.

You definitely are better off with the late model engine, even with the little bit of difficulty you're having at this point.

RobbyMartin · #3 Tue, December 22nd, 2009, 02:14 PM

I won't be satisfied until the newer engine is in and running. It should have the original 4.6 PCM and harness installed but you never know with this guy. Should I wait to purchase the Gryphon after I know what PCM is installed or can I go ahead and purchase it now? It'll be a 5.4 engine with a 4.6 PCM.

How long will it take to get the tuner if you received payment today? At least I'll have that part taken care of. Then after I get that, it'll be 4-6 weeks before the custom 5.4 performance tune will be ready?

***Power Hungry*** · #4 Tue, December 22nd, 2009, 08:11 PM

Robby,

You can order the tuner now and I can send one tomorrow. UPS doesn't pick up this Thursday (or next, for that matter) so if not tomorrow then it'll be Monday. I will need to know at some point which PCM you're running, but that's not important at this time and doesn't affect which programmer we send.

Because your situation is unique, we'd make special considerations for your tunes. It's similar to having a disabled vehicle in your case.

Take care.