Navigator 4V 5.4
Navigator 4V 5.4
Postmaster
Joined: Oct 2006
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From: SE Texas
Mostly it was a political move. The 3V uses and is tuned to use regular unleaded fuel. The 4V is designed and tuned to use premium fuel,and that was a turnoff to the typical buyer in the market for a large "gas-guzzling" vehicle. It was bad enough to use alot of fuel,but to add the extra costs of premium fuel to the equation,and you scare buyers away.The 4V will make more power/tq than a 3V,but the OE tune has the 4V fairly neutered for making power where the 3V has variable cam timing to help make power.
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Joined: Mar 2004
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From: MA
Does the 4v require 93 oct?
JL - do you run 93 oct w/ your custom tuner, or can you program a lower octane setting?
JL - do you run 93 oct w/ your custom tuner, or can you program a lower octane setting?
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Postmaster
Joined: Oct 2006
Posts: 4,171
Likes: 12
From: SE Texas
Originally Posted by kitebuz
Does the 4v require 93 oct?
JL - do you run 93 oct w/ your custom tuner, or can you program a lower octane setting?
JL - do you run 93 oct w/ your custom tuner, or can you program a lower octane setting?
JL
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Joined: Dec 2006
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From: Bainbridge, OH
The 05 3 valve Navi is tuned from the factory to run on 91 or better octane. The manual discurages from using regular gas. But what is the differance between the navi setup and expy of the same year? I watch the factory spit them out of the same assembly line. The code on my 05 navi is CDW5.
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Joined: Oct 2006
Posts: 4,171
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From: SE Texas
Originally Posted by whotnow
The 05 3 valve Navi is tuned from the factory to run on 91 or better octane. The manual discurages from using regular gas. But what is the differance between the navi setup and expy of the same year? I watch the factory spit them out of the same assembly line. The code on my 05 navi is CDW5.
JL
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Joined: Dec 2006
Posts: 32
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From: Bainbridge, OH
Does it look like Ford got as much power out of this program as possible? Or should i be looking at the PRP to try and pinch a few more ponies out of it. Right now i am not to happy with the shifting. A little too soft and not enough kick down for my taste.
Postmaster
Joined: Oct 2006
Posts: 4,171
Likes: 12
From: SE Texas
Originally Posted by whotnow
Does it look like Ford got as much power out of this program as possible? Or should i be looking at the PRP to try and pinch a few more ponies out of it. Right now i am not to happy with the shifting. A little too soft and not enough kick down for my taste.
So yes,I do believe that there are gains to be had-especially in the driveability and transmission functions.
JL
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