Mustang GT speedo problems HELP!!

[Americanricer87]

I have a 2000 Mustang GT 5sp and a U7146 Predator tuner. I bought it to change the 02 sensor configurations and the speedometer. Ok so heres the deal. When i instal the diablo tune, my speedometer is correct when it's set to 3.73. Now that i have nitrous, i set it back to FACTORY HORSEPOWER TUNE and set all the perameter to the way they were before. Now my speedo is a perfect 10mph to fast. I tried reinstalling the back up tune and starting over, i have tried reinstalling the diablo tune and taking out 8* of timing to get my desired 16* but the car is getting way to much fuel with the Diablo tune in. Can anyone tell me why the factory horsepower tune will NOT change my speedometer no matter what gear ratio i set it on... but it will under diablo tune.... help please

[Americanricer87]

Can anyone tell me why my speedo is off?

[christina]

Under the Factory HP tune the Axle Ratio parameter does not set.

[shawk]

Under the Factory HP tune the Axle Ratio parameter does not set.

Christina,
Has there been a fix for this yet so we can run factory tunes with an adjustment for the axle only? Thank you...

Steve

[christina]

No there hasn't. If you would like a Factory HP tune with your gears, you would need a custom tune. Send me an email to [email protected] and I will get you going on that.