SCT X3 /SF3 Issues?

So I ordered a SCT tuner with "custom" tunes from American Muscle, and received the device today. After reading the CD instructions I installed the "custom" tune into my car. Needless to say it felt like it had lost a good bit of power, and the speedo was still reading too fast (GPS verified). I returned the car to the stock tune, but havent driven it yet since its now stoming here; i really hope that my missing power came back. I cannot even locate the option to change the rear gearing to correct the speedo! All that are available are the timing adjustments, WOT Fuel, high and low speed cooling fan temps, and neutral and drive idle speed. I just emailed American Muscle regarding the experience, as I am extremely dissatisfied; hopefully they will do something to resolve the problem.

Anyone else have a similar experience with an AM "custom" tune, or with the SCT tuners in general?

I'm not sure who does there tuning but i would have went with a company who specializes in mustang tuning. Good luck B

Man, I want to get a tunner but now you are making me second guess getting that !!

dont second guess it!

yes i have had the same experience but with the sct livewire system the custom tune didnt work for me in the 07 mustang i was so dissatisfied i ended up selling my tuner

I think I may sell mine as well....might work better with a tune from someone better, but im not going to mess with it at this point. I drove the car this morning with the stock tune back in it and the car was back to feeling good.

Juan, if you want to buy one let me know. I'll sel you mine and you can just get a tune from a known good tuner.

Sux you had issues. I have the SCT xcal2 and have no problems with it. I tried a mail order tune with it and my car ran pretty bad (pinging, etc). I got a dyno tune and that took care of the pinging, etc. I just wish I had more mods to make the dyno tune more worthwhile.

Thanks Bronson. I received a response to my email, which is admirable. Unfortunately they said that the device cannot adjust for the axle gear ration on any Cobra pre MY99. The SCT user guide says differently, so there is some misinformation somewhere. AM would like to work with me to adjust the tune, but i dont know that i even want to mess with it now. The car is back to running good without it, and it will not fix the speedo calibration. I see no point in buying yet another device to fix that when this one is advertised to do so on my car.

Doesn't your car need a new speedo gear or soemthing like that to fix the calibration? I know my device can adjust the axle ratio but it is a different tuner and different year car...

Maybe upgrade the firmware on the tuner?

What year is your cobra?

1983-89 Mustang Manual 5-Speed
3.08 18 Tooth LRS-17271H
3.27 19 Tooth LRS-17271A
3.55 20 Tooth LRS-17271B
3.73 21 Tooth LRS-17271C-K
4.10 23 Tooth LRS-17271D-K

1990-93 Mustang Manual 5-Speed
3.08 20 Tooth LRS-17271B
3.27 21 Tooth LRS-17271C-K
3.55 23 Tooth LRS-17271D-K

1984-89 Mustang Automatic AOD
3.27 19 Tooth LRS-17271E
3.55 20 Tooth LRS-17271F
3.73 21 Tooth LRS-17271G
4.10 23 Tooth LRS-17271J-K

1990-93 Mustang Automatic AOD
2.73 19 Tooth LRS-17271E
3.08 20 Tooth LRS-17271F
3.27 21 Tooth LRS-17271G
3.55 23 Tooth LRS-17271J-K

1996-98 Mustang Cobra Manual 5-Speed
3.27 19 Tooth LRS-17271A
3.55 20 Tooth LRS-17271B
3.73 21 Tooth LRS-17271C-K
4.10 Speed Cal LRS-SPDCAL2

1994-98 Mustang Manual 5-Speed
Except 1996-98 Cobra
3.08 20 Tooth LRS-17271B
3.27 21 Tooth LRS-17271C-K
3.55 23 Tooth LRS-17271D-K

1994-98 Mustang Automatic AOD
2.73 19 Tooth LRS-17271E
3.08 20 Tooth LRS-17271F
3.27 21 Tooth LRS-17271G
3.55 23 Tooth LRS-17271J-K

pikuoff wrote:Doesn't your car need a new speedo gear or soemthing like that to fix the calibration? I know my device can adjust the axle ratio but it is a different tuner and different year car...

Maybe upgrade the firmware on the tuner?

Its conflicting info..SCT's user guide says it will allow the user to adjust this parameter on 96-01 Cobras, the person from American Muscle that responded to my email said it will not do that for a pre 99 Cobra. I do not see in a field for it in the adjustments on the device. Regardless, i dont believe I will be keeping this tuner so it isnt a huge issue. SCT does need to fix their manuals to reflect accurate information though, IMO.

I am soon going to buy the pro-racer package to start learning how to tune, and tune my car. I hope to find someone that is selling theirs cheap...

TT_05_Stang wrote:What year is your cobra?

Its a 97, per my sig.....lol.

Its cable driven than, and can not be calibrated by a tuner.

TT_05_Stang wrote:Its cable driven than, and can not be calibrated by a tuner.

Sweet...I got this one right! I guess im startin to learn good

Sucks that the tuner can't adjust the speedo on your car!