i have the diablo sport tuner and i just got my 4.10's installed.. i tried to program my gear ratio in on the diablo and did then programed my car and my speedometer is still 10mph off just like before.. i tried to put the factory tune back on and start over but its the samething i cant get it to work whats the problem?? help me please??
diablo help
- Thread starter 40thmustanggt
- Start date
yes i set it to 4.09 and no i have 17x10.5 on the rear with a 315/35/17 tire.. is that the reason? where do i set tire sizes?
lazerred02
New Member
Make sure that after you set the gear ratio when you esc. out of that screen it will ask you if you want to keep the changes if you do not accept that it will not change anything.
no it wasnt and ive tried that im almost ready to throw this thing out the window and buy a sct.. this sucks
i also tried to bump it up to the highest gear it would go and it still didnt change 10mph off..
i got it thanks.. my problem was i was trying to change it under the factory hp tune and the gear setting won't accept from that tune..
twogts4us
15 Year Member
This is a known issue. I ran into the same problem when I went back to my factory tune to run nitrous but also still wanted my speedo corrected for 3.73 gears. Chris Johnson at Diablo was a huge help. I restored my factory tune, made my modifications and saved and uploaded it into the car. The other changes took - the traction control, rear O2's off, rev limiter raised, etc, but the speedo correction did not.) I then used DSDownloader to download my tune from my Predator to my PC, then emailed the tune to Chris. He quickly 'fixed' it and sent it back to me the same day, then I was able to install that tune and all is now well. Great customer service. Here's the thread and his email address. http://www.modularfords.com/forums/showthread.php?t=92314
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