Why do I need a tuner for.....

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Jun 7, 2012 | 09:02 PM

smokinjoe78

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Why do I need a tuner for.....

My 05' f150 lariat screw 4x4 with flow master catback exhaust & CAI with 132,000miles?? But my old 2000mustang gt with the 4.6L with the same mods was fine?? No tuner needed...

Thanx for any input

Sj78

Jun 7, 2012 | 09:38 PM

otto457

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The 3V 5.4L uses a slot style MAF which is not as forgiving as the old style like in your 2 valve 4.6. The 04-05 5.4L also runs a 14.7 a/f at WOT, and runs nearly lean from the factory sometimes.

Jun 7, 2012 | 09:55 PM

Franchi Motorsports

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Nailed in one as usual Otto!

Jun 7, 2012 | 10:01 PM

LUVmyDUX

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From: NW Portland

Quote:

Originally Posted by otto457

The 3V 5.4L uses a slot style MAF which is not as forgiving as the old style like in your 2 valve 4.6. The 04-05 5.4L also runs a 14.7 a/f at WOT, and runs nearly lean from the factory sometimes.

Otto, so if my 2v 4.6 F150 has the same mods as the OP then a tuner is not really needed? Just trying to learn...

Jun 7, 2012 | 10:33 PM

otto457

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It is not as dangerous on the 4.6L, however if you want the full benefit of any intake a custom tune will make the most of it. Catback exhaust modifications don't warrant a custom tune.