I have bought a SF3 programmer from troyer performance and i am waiting on my custom tunes, but so far with just the canned tunes it shifts alot better and just seems to be a better ride. I have put in the 87 octane tune and changed my gear ratio to 4.56 gears an tried to change my rev per mile to get my speedo and odometer correct but no luck, i have entered the rev per mile that i figured out from the website glenn at troyer gave me and also did some searching on the net and it all matchs up to 560 rev per mile and it is 20to 30 MPH off on the speedo and on stock setting it is only 5 MPH off, i have 37x13.5x18 mickeythompson baja MTZ tires. What the hell is going on does anyone know or has had this problem.

 

I guess the first dumb question is: Do you have 4.56 gears?

Based on the specifications from Mickey Thompson's website, the O/D on those tires is 36.8" which yields a rev/Mile closer to 548, not 560. This is a minimal difference though and wouldn't account for 20-30 MPH off.

 

That is the gears i told the shop to put in when i had them installed now if they put 4.56 gears that i dont know but i damn sure hope so. I have called and talked to troyer and they told me to call SCT and SCT had me update my firmware and it is still doing the same thing, but i dont even have the choice of a tow or economy tune in the tunner to be able to install a tune all i can do is select my octane level and my settings like tire size gear ratio etc. and when i am finished it says uploading tune. I told troyer if that is all i have on stock tunes that is not what i read up on the X3 what i thought i ordered from the begining, but he assures me that is a newer version of the X3 and should have all the same options your just able to keep stock tunes with also custom tunes in the programmer.

 

I noticed the same thing with mine and here is a quote from the SCT website.
IMPORTANT NOTICE REGARDING X3 & SF3 Power Flash Devices sold prior to July 25th, 2008:
SCT has recently updated the firmware for all X3 & SF3 devices. These devices now have different firmware that will effect all future updates for your device.

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X3 devices part #3000 sold after July 25th, 2008 will now only be used for custom tuning and will no longer contain pre-loaded tunes. The SF3 device part #3015 will hold 3 custom tunes and will ship with pre-loaded tunes as in the past.

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If you have purchased an X3 device part #3000 or SF3 device part #3015 prior to July 25th, 2008, your device is now considered an SF3 device part #3015, even though the device stickers may state it is a part #3000. When updating your device with any future firmware or tune revisions, you must use the SF3 part #3015 device updates or you will receive an error when updating the device.

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Devices sold after July25th, 2008 should use the matching firmware for the part number on the device sticker.

 

When I tried to input the revs per mile on the tires with the info from BFG my MPH was way off. I just put it back to stock. We'll see if it is ok with the custom tunes from Troyer.

 

Well, the quote from SCT is as clear as....!

I dunno, laford. You've got a HUGE error in the speed. As ASEMechanic says, though, even changing to 548 rev per mile isn't going to get you anywhere near the ballpark. You've got somewhere in the neighborhood of a 30+% error in speed. You didn't say if it was indicating too fast or too slow. If you are indicating too slow, it's because the PCM thinks your tires are smaller than they really are. You'd need to increase their circumference - which reduces the number of revs per mile by about 30% or, down to 392. If you're indicating too fast, you'd need to increase the revs per mile to about 728.

Both of these are ridiculous figures. I think there is something wrong with the programmer or, you are making some small (but significant) mistake when you are entering the revs number. Since I don't have an XCal, I can't give you better advice than this.

Actually, I can: Get Troyer on the phone and have them "talk" you through the setting up of this data through the XCal as you do it on your truck. That way, both you and they would know if you are doing it right.

If Troyer is as reputable as I think he is, TP will do this with you. I KNOW Bill (ASEMechanic) at PHP would do it for a Gryphon, so, give it a try.

- Jack

 

I think it is the programmer tunes that are screwed up, i have been on the phone with Glenn with troyer for the past two weeks and he is very helpful but he could not figure out why my revs per mile were off and then we realized i dont even have any canned tunes as stated in the SCT web site. I am supposed to have a Tow tune, a performance tune and a Economy tune, which i dont even have. All i have is the option to adjust on my Tire size, Fuel, shifting, and speedo shut off, and gears, other than that there is nothing else. I only see a difference in the driving when i change my gears which that is all i can do with the programmer, my revs per mile is at stock setting because it is only 10mph off on speed instead off 20 to 30mph on any other rev/per mile. And my MPH are showing higher so when i am doing 70mph on interstate i am doing 95mph on my speedo as per my GPS which you can tell without the GPS it is way off. Glenn had SCT call me themselves and i had to email them my stock and flash tune and they are going to look to see if it is not correct, Last week SCT had me update the firmware but no luck it still did the same exact thing. Waiting on SCT to let me know what they found then will go from there.

 

You are describing mine too. There is nothing for towing or performance. So what's the deal?

 

I received a message from SCT that they passed it on to the calibration department and i will have to wait until the next updated tune version to get it corrected, and that was about the tire size and speedo they never even said anything about the tune options. They are saying that it will only take one option at a time it will not save more than one. I am so fed up i sent glenn with troyer a email and told him to let me know if they started on my custom tunes yet because if not i will probally return the programmer, the reason i bought the thing was to get my tires and speed correct and the reason i went with troyer was because i would be able to run the canned tunes until my custom tunes came in. I could have went with anyone and just waited 8 to 10 weeks for custom tunes.