3.31 rear gear install / speedometer adjust
6/2/15, 08:36 AM
#1
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3.31 rear gear install / speedometer adjust
I just had a set of 3.31 ford racing rear gears installed on my 2013 v6 man. trans. and tried to update my bc with my diablosport intune. I was able to change the setting from the standard 2.73 to the 3.31 on the intune and than programmed the car but that didn't do anything I guess. The speedo is off and the diffrence from the gps speed gets worse the faster I drive.
What can I do, any ideas? Is the ratio really programmable or do I have to change the hardware somehow?
What can I do, any ideas? Is the ratio really programmable or do I have to change the hardware somehow?
6/2/15, 01:16 PM
#3
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No, i don't get any free tunes, but i am in contact with someone from diablosport. He told me to send him the original backup and the last installed tune file. There could be a problem within the tune file ...
6/3/15, 12:17 PM
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I'll send him the files next weekend as soon as I get back home. Hope he can fix the problem, it's a pain in the bud to drive with this irritating readings...
Why should only a dealer be able to change that?
Why should only a dealer be able to change that?
Last edited by SpeedyJoe; 6/3/15 at 12:18 PM.
6/3/15, 03:14 PM
#6
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If your tune is an 'opened tune' you can adjust the tire and wheel size by revolutions per mile and any rear gear ratio (and a few other things) in the 'settings' before you load the tune. Some tunes are 'closed' and can't adjust anything. I made sure all my tunes are 'opened' tunes. 
6/4/15, 06:52 AM
#7
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It is an open tune, according to the intune I can adjust wheel, tire size, rear gears and quite a few more items but in my case the rear gear adjust doesn't work. And I don't have a clue why.
All my previous changes did work, like speed limiter and so on...
All my previous changes did work, like speed limiter and so on...
6/9/15, 08:57 AM
#8
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There might be something wrong with the preloaded tune file on the diablo tuner. It needs to be updated by them.
Because if you can manually adjust it, there is no way the speedometer should show an incorrect reading. Definitely sounds like it didn't make the gear change in the tune.
Because if you can manually adjust it, there is no way the speedometer should show an incorrect reading. Definitely sounds like it didn't make the gear change in the tune.
6/10/15, 04:55 AM
#9
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Just received the second modified tune from diablo and it finally seems to work!
The car feels much better now, quicker acceleration during all phases of driving. You can even cruise in six gear and accelerate without shifting down all the time. Great improvement, they should have delivered the car that way. I think I even save some gas, I simply don't have to change gears all the time 👍
The car feels much better now, quicker acceleration during all phases of driving. You can even cruise in six gear and accelerate without shifting down all the time. Great improvement, they should have delivered the car that way. I think I even save some gas, I simply don't have to change gears all the time 👍
6/10/15, 06:43 AM
#10
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Just received the second modified tune from diablo and it finally seems to work!
The car feels much better now, quicker acceleration during all phases of driving. You can even cruise in six gear and accelerate without shifting down all the time. Great improvement, they should have delivered the car that way. I think I even save some gas, I simply don't have to change gears all the time 👍
The car feels much better now, quicker acceleration during all phases of driving. You can even cruise in six gear and accelerate without shifting down all the time. Great improvement, they should have delivered the car that way. I think I even save some gas, I simply don't have to change gears all the time 👍
Couldn't agree more. I've driven 2.73 gears on an Auto, found shifting sluggish and gears were really long.
haven't driven 3.73 so I can't comment on those. mine came with 3.31 gears and you're right. It is nice to be able to accelerate in 6th without having to constantly downshift
8/24/15, 02:06 PM
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Today I tried to use a different tune with my intune but I encountered the same problem again. Most of the modifications work but as soon as I dial in the 3.31 gears, my car does not do the change, meaning the speedo is of again.
Did anybody experience the same problem using the diablosport intune?
Did anybody experience the same problem using the diablosport intune?
9/20/15, 05:03 PM
#17
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MPG will obviously take a hit, plus first will be even more useless on the street (unless you like first being super short...).
I've been considering 3.73's just so I can more easily start in second more often. I think first is too short even with 3.31's...
I've been considering 3.73's just so I can more easily start in second more often. I think first is too short even with 3.31's...
9/21/15, 01:14 PM
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My fuel economy bone stock with 3.31s was never what ford advertised. I got at best 27 on the highway. With 3.73 and a supercharger i am still getting 27 on the highway, 23 combined.
I have no gear whine, no issues with noise. My tuner did the install of the gears when he did my tune. I went with them because i will be tracking my car next year and was told i will have greater exit speeds out of the corners. The difference is already evident when already doing 70 on the freeway all i have to do is get on the throttle and pull away in 6th without having to downshift.
I have no gear whine, no issues with noise. My tuner did the install of the gears when he did my tune. I went with them because i will be tracking my car next year and was told i will have greater exit speeds out of the corners. The difference is already evident when already doing 70 on the freeway all i have to do is get on the throttle and pull away in 6th without having to downshift.
Last edited by V6 Driver; 9/21/15 at 01:21 PM.
9/21/15, 08:35 PM
#20
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Mine sees a lot of highway use, I was thinking the 3.31's would perk it up in the city but not hurt the gas mileage on the highway. I also don't want to have to mess with a tune which could void the warranty, and if I understand things correctly Ford can reprogram it for the 3.31's since it is a factory option.