Revs per Mile HELP!!! - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 26 (permalink) Old 05-19-2010, 05:53 PM Thread Starter
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Revs per Mile HELP!!!

Does anyone know how to tweak in their Speedo?

I changed my revs per mile and its still off.

My tires are 35"s and doing the tape measurement it comes out to 592 revolutions per mile. But when I enter that in my SCT my Speedo is still off by 10mph.

I tried playing with it and going lower and higher and it appears to stay the same.

Any suggestions????

Chris
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post #2 of 26 (permalink) Old 05-19-2010, 06:02 PM Thread Starter
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just playing around with generic calculations I just came up with 576 revs per mile. Maybe I'll try this.

Chris
2004 F250 Lariat 6.0L
Torqueshift, 4x4, Supercab, Shortbox.
AEM Brute Force HD Intake, GT4088 VGT Turbo, Spearco Intercooler, Custom EGR Cooler Delete,
H11 Head Studs, Fass 150/180, Custom Fuel lines, Custom Coolant Filter, Single 6" Stack, 2.5" Lift. 35x13.5 on 20's

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post #3 of 26 (permalink) Old 05-19-2010, 06:08 PM
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I don't think that changing it in a Tuner will change the display on your Speedo. Changing in a Tuner only sets it for the inserted program for it's strangles.

I used to own a '95 7.3 and you could adjust the Speedo and it helped with the Auto Trans shifting, but I don't think you can do that on the 6.0.

2003 CC SB 4X4 6.0 26,250 miles July 1, 2010
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post #4 of 26 (permalink) Old 05-19-2010, 06:16 PM
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You will have to have the dealer make the changes to correct your speedometer. I believe they can correct for up to a 38" tire.
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post #5 of 26 (permalink) Old 05-19-2010, 06:21 PM
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Yup. Scts setiing is very crictical for the trans so make sure you set it back to what your tires really are. Sct won't change the spedo




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post #6 of 26 (permalink) Old 05-19-2010, 07:01 PM Thread Starter
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So its dealer or superlift tru speed.

Chris
2004 F250 Lariat 6.0L
Torqueshift, 4x4, Supercab, Shortbox.
AEM Brute Force HD Intake, GT4088 VGT Turbo, Spearco Intercooler, Custom EGR Cooler Delete,
H11 Head Studs, Fass 150/180, Custom Fuel lines, Custom Coolant Filter, Single 6" Stack, 2.5" Lift. 35x13.5 on 20's

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post #7 of 26 (permalink) Old 05-19-2010, 07:07 PM
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AutoEnginuity can reprogram tire size as well, its in the ABS Module.

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post #8 of 26 (permalink) Old 05-19-2010, 08:23 PM
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Well I took mine to Ford, had my buddy plug the computer in it, but he could not recalibrate for some ABS error. Am I just screwed or can I use something else?

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post #9 of 26 (permalink) Old 05-19-2010, 08:30 PM
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If you're getting an error you could have a wiring problem or an issue with your ABS module. Mine won't communicate, but mine was hit on that corner before I bought it wrecked, so I may have missed a bad wire or the controller is eff'd.

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post #10 of 26 (permalink) Old 05-19-2010, 09:48 PM
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will adjusting the tire revs help me with my truck being a stick shift

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