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6.4L Performance Parts Discussion What has or has not worked for you?

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post #1 of 13 Old 09-12-2009, 11:32 AM Thread Starter
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Innovative Tunes

Am I the only poor SOB BARELY cracking 10 MPG's using the extreme race tune? ON THE HIGHWAY!
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post #2 of 13 Old 09-12-2009, 11:54 AM
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On xtreme race I get 16.5 ,,,,,3.73 gears with 35 inch tires and auto tranny....70 mph up and down moderate hills.
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post #3 of 13 Old 09-12-2009, 11:55 AM Thread Starter
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So that's around 500 miles a tank on a shortbed correct? I'm BARELY getting to 300, and that's with filling 32 gallons into the tank. Average was 450 miles per tank with the canned SCT extreme tune.
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post #4 of 13 Old 09-12-2009, 11:59 AM
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dont go only by the lie o meter, hand calculate for bet results.

Also, if you have larger tires, and your speedo isn't adjusted, make sure you compensate for miles shown vs. actual miles driven, prior to figuring MPG

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First Coast Diesel Performance

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post #5 of 13 Old 09-12-2009, 12:00 PM Thread Starter
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Originally Posted by Abrannan19 View Post
dont go only by the lie o meter, hand calculate for bet results.

Also, if you have larger tires, and your speedo isn't adjusted, make sure you compensate for miles shown vs. actual miles driven, prior to figuring MPG
I'm going by Miles per tank, I reset the meter every fill-up. My speedo is adjusted to my tire size as well.
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post #6 of 13 Old 09-12-2009, 12:08 PM
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what did you use to calibrate the speedo?

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post #7 of 13 Old 09-12-2009, 12:17 PM Thread Starter
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what did you use to calibrate the speedo?
The SCT user options while loading the tune, this works right?
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post #8 of 13 Old 09-12-2009, 12:42 PM
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no, unless something is different for the 08^ the SCT cannot calibrate from larger tires and adjust the speedo, it will allow you to enter revs and tire size but that just adjust shift points.

What size tires are you running?

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post #9 of 13 Old 09-12-2009, 12:44 PM
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No,,,that doesn't actually correct the speedo,,,it is to tell your tranny to shift at different points to accommodate your bigger tires...
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post #10 of 13 Old 09-12-2009, 01:05 PM
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Added Adjustable Options for:
-Aftermarket Cold Air Intake
-DPF Delete On or Off (Only on OR Versions)
-Speedometer Corrections Due to Tire Size or Axle Change
-Traction Control On/Off
-WOT Shift Points

^^^Taken from SCTflash.com on the new tune revision for the 6.4L Livewire.

Sales @ Rudy's Diesel Performance
*CONTACT US FOR SPECIAL PACKAGE DEALS ON SPARTAN, SCT AND H&S PERFORMANCE DPF/CAT DELETE KITS*
(919) 383-9300 OR Toll-Free # 1-866-757-6537

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