SCT, Tire Size & Speedo Adjustments? - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 04-13-2009, 06:52 AM Thread Starter
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SCT, Tire Size & Speedo Adjustments?

There is a place for Tire size selection in the SCT. If you enter other than stock does the computer make adjustments to the speedometer for the difference in diameter?

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post #2 of 10 Old 04-13-2009, 07:01 AM
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It just adjusts the tire size for shifting. Doesnt do anything for the speedo

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post #3 of 10 Old 04-13-2009, 07:10 AM Thread Starter
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I thought so, but I wasn't sure

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Originally Posted by cchase View Post
Do you know what the hardest part of driving a dodge is? Telling your parents that your gay.
Sold the truck to help pay $1.5M in medical bills! Now I have a F150 6cyl that is slower and gets worse mileage
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post #4 of 10 Old 04-13-2009, 08:58 AM
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Quote:
Originally Posted by robertcarmel View Post
There is a place for Tire size selection in the SCT. If you enter other than stock does the computer make adjustments to the speedometer for the difference in diameter?
Seems pretty obvious that it would have this ability, but, for whatever reason it doesn't

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post #5 of 10 Old 04-13-2009, 09:27 AM
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Quote:
Originally Posted by Dave View Post
It just adjusts the tire size for shifting. Doesnt do anything for the speedo
Really? I thought for sure it adjusted the speedo. How do you do that?

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post #6 of 10 Old 04-13-2009, 09:30 AM
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You need a "truspeed" (I think thats what its called) to adjust the speedo
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post #7 of 10 Old 04-13-2009, 09:31 AM
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Quote:
Originally Posted by stroken04 View Post
You need a "truspeed" (I think thats what its called) to adjust the speedo
You need a superlift truspeed, Auto engineuity, The TS Respeed. Or ford can flash it for up to 35s

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post #8 of 10 Old 04-13-2009, 09:39 AM
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Quote:
Originally Posted by Dave View Post
You need a superlift truspeed, Auto engineuity, The TS Respeed. Or ford can flash it for up to 35s
The dealership can flash it, but when I asked about it before I bought my X3 (thinking I could adjust the speedo with that) they could not (or would not) guarantee the accuracy. Nor would they reflash till it was correct without charging for any subsequent reflashes. So be aware of that.

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post #9 of 10 Old 04-13-2009, 09:40 AM
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Is it only the X3 that has the tire size adjustment option? I have the Xcal2 and haven't seen that option. Can it be written into the tune?? I know on DJ's tunes I can adjust my shift points but on erics I can not.

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post #10 of 10 Old 04-13-2009, 09:43 AM
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Quote:
Originally Posted by Rwalker View Post
Is it only the X3 that has the tire size adjustment option? I have the Xcal2 and haven't seen that option. Can it be written into the tune?? I know on DJ's tunes I can adjust my shift points but on erics I can not.
Rob the Xcal 2 has it. When you go to custom tune it. When it asks to change additional parameters say yes. Then what you are looking for is revs per mile

Use this tire calculator to figure your revs per mile Tire Size Calculator

Email: Dave@powerstroke.org
2011 F150 Ecoboost Crew cab lariat. Custom tunes from KEM and 5Star, and Unleashed
2012 F150 Crew Cab Ecoboost stock for now-Totaled March 12 2015
2006 F250 ECSB Lariat 4x4

Leveling kit, 315/70/17 Kelly TSRs on Method race wheels
ARP studs and OEM gaskets done by Renegade Diesel
ECM and Atlas 40 FICM tuned by Bill at PHP SCT tunes by Truck Source Diesel. Gearhead, Innovative, Wildman and Tyrant diesel
Flowmaster/MBRP Hybrid Exhaust
Edge Insight CTS
Coolant filter
Bulletproof diesel FICM EGR Delete, Oil Cooler and Water Pump, and Light bar.
Dually LED lights from Stealth Automotive/Xpedition Outfitters
No Limit Fab 6.0 Cold Air Intake
http://www.bulletproofdiesel.com/default.asp
http://nolimitfabrication.com/
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