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  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

diablo help

  • Thread starter Thread starter 40thmustanggt
  • Start date Start date Dec 13, 2007
4

40thmustanggt

New Member
May 19, 2007
34
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0
Dec 13, 2007
#1
  • Dec 13, 2007
  • #1
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??
 

Spro

New Member
Nov 3, 2007
73
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0
IL
Dec 13, 2007
#2
  • Dec 13, 2007
  • #2
Did you set it to 4.09? Also are you running the stock size tire still?
 
4

40thmustanggt

New Member
May 19, 2007
34
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0
Dec 13, 2007
#3
  • Dec 13, 2007
  • #3
Spro said:
Did you set it to 4.09? Also are you running the stock size tire still?
Click to expand...
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
Nov 19, 2004
190
1
0
FT Stewart, GA
Dec 13, 2007
#4
  • Dec 13, 2007
  • #4
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.
 
4

40thmustanggt

New Member
May 19, 2007
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Dec 13, 2007
#5
  • Dec 13, 2007
  • #5
lazerred02 said:
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.
Click to expand...
did that also..
 

Spro

New Member
Nov 3, 2007
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IL
Dec 13, 2007
#6
  • Dec 13, 2007
  • #6
No. You don't need to change the setting for the 315's
I would return the stock tune and reset all the paramaters and start all over.
Maybe your needle was put in the wrong spot. Was the guage overlay ever changed?
 
4

40thmustanggt

New Member
May 19, 2007
34
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0
Dec 13, 2007
#7
  • Dec 13, 2007
  • #7
Spro said:
No. You don't need to change the setting for the 315's
I would return the stock tune and reset all the paramaters and start all over.
Maybe your needle was put in the wrong spot. Was the guage overlay ever changed?
Click to expand...

no it wasnt and ive tried that im almost ready to throw this thing out the window and buy a sct.. this sucks
 
4

40thmustanggt

New Member
May 19, 2007
34
0
0
Dec 13, 2007
#8
  • Dec 13, 2007
  • #8
Spro said:
No. You don't need to change the setting for the 315's
I would return the stock tune and reset all the paramaters and start all over.
Maybe your needle was put in the wrong spot. Was the guage overlay ever changed?
Click to expand...
i also tried to bump it up to the highest gear it would go and it still didnt change 10mph off..
 

Spro

New Member
Nov 3, 2007
73
0
0
IL
Dec 13, 2007
#9
  • Dec 13, 2007
  • #9
Well, seeing your not really getting anywhere, Try changing the tire size to 802 revs per mile and see how many mph off that brings you to.
 
4

40thmustanggt

New Member
May 19, 2007
34
0
0
Dec 13, 2007
#10
  • Dec 13, 2007
  • #10
Spro said:
Well, seeing your not really getting anywhere, Try changing the tire size to 802 revs per mile and see how many mph off that brings you to.
Click to expand...
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
Apr 1, 2004
4,188
12
79
Dunedin, FL
Dec 15, 2007
#11
  • Dec 15, 2007
  • #11
40thmustanggt said:
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..
Click to expand...

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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