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Old 07-09-2011, 12:04 AM
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Adjustable settings on SCT tuner

I have a question. I got my SCT SF3 today, and loaded the performance tune. At first I told it to lock convertor in 1-2-3, firmer shifts, turn off EGR, etc... Well, the locked convertor I assume is for WOT, balls to the wall throttling, because on the street, under lighter to moderate throttle, it would shift and just drop out to nothing for a second, enough to make my turbo "huff" and make it sound like someone had put a straight shift into too high of a gear, and was lugging it. I went back in, set convertor lock to normal, left the shifts firm, made sure I had the correct axle ratio, and it shifts MUCH nicer now. OK, to my question: what does convertor lock @ CT mean, and on the speedo calibrate/tire size, how do you determine how many revolutions per mile a 305 70R/16 makes? It would be easier to list sizes, but they don't, it asks tire revs per mile. Maybe there's a chart? A calculation? And lastly, does anyone have any suggestions on the trans pressure settings from one gear to another, or should i leave that alone? I just want to get it as good as possible, have good solid shifts, but not make it shift TOO harshly for a DD until I get custom tunes on payday.
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  #2  
Old 07-09-2011, 03:32 AM
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Re: Adjustable settings on SCT tuner

305/70R16 is equal to 614.67 revolutions per mile..
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Old 07-09-2011, 04:09 AM
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Re: Adjustable settings on SCT tuner

I have 305/70/16 and they measure at 99 inches and divide that by how many inches are in a mile and I get 640 revolutions per mile
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Old 07-09-2011, 05:20 AM
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Re: Adjustable settings on SCT tuner

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Originally Posted by 3brorce View Post
I have 305/70/16 and they measure at 99 inches and divide that by how many inches are in a mile and I get 640 revolutions per mile
After doing some researching, I got the same number as WoodBoy for my 305 70R 16's. Basically it's 615 on the tuner. I got my info from Discount tire's website using this: http://www.discounttire.com/dtcs/infoTireMath.dos
If you're using 640 for your number, you may wanna check it against a GPS or something, see how they compare. I'd say your speedo and shifts could still be off slightly. (if that link takes you to the home page or whatever, click on the box that says "Inflate your tire knowledge" and you'll find the calculator in there somewhere.)
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Old 07-09-2011, 05:24 AM
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Re: Adjustable settings on SCT tuner

According to that calculator I mentioned above, a good 305 70R 16 is supposed to be 103.08 in circumference, so that's where your difference is. I don't know, just going by that, you may have actually measured around yours, but I've already seen several places say 614.67/615 RPMile for that size.
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Old 07-09-2011, 05:37 AM
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Re: Adjustable settings on SCT tuner

The only way to get the correct Revs Per Mile setting is to hand measure...
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Old 07-09-2011, 06:04 AM
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Re: Adjustable settings on SCT tuner

Makes sense. I didn't know the math to perform once I got that measurement, so I looked for that calculator. I may just measure mine in the morning and see how close (or far off) I am to the 615 I used. For all I know, his 640 may be dead on.
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Old 07-09-2011, 01:37 PM
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Re: Adjustable settings on SCT tuner

My shift pressures are adjusted up a bit(10-15%) I think. Had it that way for about 2 years now. I do not have it set for firmer shifts, that was a little to firm for my wifes dd....
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Old 07-09-2011, 02:50 PM
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Re: Adjustable settings on SCT tuner

Quote:
Originally Posted by bigf350sd View Post
After doing some researching, I got the same number as WoodBoy for my 305 70R 16's. Basically it's 615 on the tuner. I got my info from Discount tire's website using this: http://www.discounttire.com/dtcs/infoTireMath.dos
If you're using 640 for your number, you may wanna check it against a GPS or something, see how they compare. I'd say your speedo and shifts could still be off slightly. (if that link takes you to the home page or whatever, click on the box that says "Inflate your tire knowledge" and you'll find the calculator in there somewhere.)
My tires are pretty wore down and I measured them by hand putting a piece of tape on 6 oclock on my tire and stopped back at 6 making a full rotation. I measured the left front and left rear at the same time and the left front was 99 and the rear was 98.75. I seen on a revs per mile sticky on the powerstroke.org how this guy did it and I did it the same way so I dont know.
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Old 07-09-2011, 02:52 PM
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Re: Adjustable settings on SCT tuner

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Originally Posted by 3brorce View Post
My tires are pretty wore down and I measured them by hand putting a piece of tape on 6 oclock on my tire and stopped back at 6 making a full rotation. I measured the left front and left rear at the same time and the left front was 99 and the rear was 98.75. I seen on a revs per mile sticky on the powerstroke.org how this guy did it and I did it the same way so I dont know.
That's my sticky!

According to the calculator, my tires should have been 635, but they ended up being 625 when I hand measured.
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