tire revs? and srl - Ford Powerstroke Diesel Forum

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post #1 of 13 Old 02-16-2014, 10:42 AM Thread Starter
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tire revs? and srl

hey guys maybe a stupid question but how many revs would 33x12.5x20 tires put out? asking this because I just loaded srl up on the truck and I've seen where some people have said this needs to be delt with. also what about the break in period with the srl? how long?

thanks
zach
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post #2 of 13 Old 02-16-2014, 11:37 AM
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A 33" tire will get you approx. 621 revolutions per mile.

You'll have to match both values in the SCT though, so 620 will do for both.

By both, I mean the REVs in the SCT device AND the SRL tune.

Both are adjustable and folks have problems because they don't adjust both, just one or the other.

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post #3 of 13 Old 02-16-2014, 12:49 PM
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Quote:
Originally Posted by Zjbennett94 View Post
hey guys maybe a stupid question but how many revs would 33x12.5x20 tires put out? asking this because I just loaded srl up on the truck and I've seen where some people have said this needs to be delt with. also what about the break in period with the srl? how long?

thanks
zach
You really should measure them using the chalk procedure. The published revs per mile are accurate for a new and unloaded tire - and don't incorporate tread wear, inflation pressure, and vehicle weight.

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post #4 of 13 Old 02-16-2014, 06:22 PM Thread Starter
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I just changed it on the srl tune but can't seem to find how to change it on the sct? truck is a 04 do they have it available for that year ?
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post #5 of 13 Old 02-16-2014, 06:36 PM
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When you select custom tune from the menu, it will ask you if you want to change the tire revs for speedometer calibration... That's the SCT REV adjustment.

Then you select which tune you want and it will ask you is you want to "adjust user options;" that's the SRL REV adjustment.

The year of the truck doesn't matter.

Also, like someone else talked about the "chalk method..." Rest assured that is the procedure I did to get the REVs of 620.

Good Luck!

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post #6 of 13 Old 02-16-2014, 06:52 PM Thread Starter
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When I choose custom tunes I am not getting the change tire size option
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post #7 of 13 Old 02-16-2014, 07:12 PM
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Quote:
Originally Posted by Zjbennett94 View Post
When I choose custom tunes I am not getting the change tire size option
It should say "Recalibrate Speedometer."

Denis "Lt. Sled"
2006 F-350 Crew Cab Long Bed Dark Shadow Gray

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post #8 of 13 Old 02-17-2014, 05:06 AM
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Try updating the firmware on the SCT. Make sure you return the truck to stock first then do the firmware update.

When I get new tunes I measure out the tire revs first and ask them to use that measurement.


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post #9 of 13 Old 02-17-2014, 07:10 AM Thread Starter
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just updated everything Saturday I believe. maybe I missed the firmware
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post #10 of 13 Old 02-17-2014, 03:43 PM
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Your SCT software has the function to check the firmware.


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