jesse3638
Hooked
Just go with the jscan app. Seems to be a really good option and more comprehensive than some of the more expensive options out there.
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Is there a way to reset computer to relearn shift points?
- Thread starter AgBass01
- Start date
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AgBass01
Caught the Bug
That's what I was gonna do. :thumb:
kyle521
Member
I went this route, the JScan app is great also for reading and clearing codes in addition to the tires and gear ratio. For some reason the app did not work on my old phone but works on my newer Ipad. I went with the Veepeak for the obd port blue tooth reader
AgBass01
Caught the Bug
Just ordered the vgate 4.0, gotta love Amazon free delivery tomorrow.
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USMC Wrangler
New member
I had a similar issue earlier this year. It wouldn’t shift but not sure if it was technically limp mode.
https://wayalife.com/showthread.php?t=56589
It took 2-3 times of programming the gear ratio to get it right.
https://wayalife.com/showthread.php?t=56589
It took 2-3 times of programming the gear ratio to get it right.
Turbo21
New member
I have been having the same issue since changing to 5.13 gears. 3-4th gear up a hill likes to run at about 5500 rpm before shifting and I have even used the auto stick to force a shift. Gears and tire size were set with flash cal. I just used the OBD adapter and JScan to rewrite the gears I’m heading out in a bit and hopefully that changes something I will update back
From all the googling I have done it seems like a pretty common problem when changing the gear ratio with the flashcal. A lot of people have had to take it to the dealership for a flash then rewrite again with flashcal before the shift points were at a more normal range
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From all the googling I have done it seems like a pretty common problem when changing the gear ratio with the flashcal. A lot of people have had to take it to the dealership for a flash then rewrite again with flashcal before the shift points were at a more normal range
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17xJKU
New member
I have the flashcal, went from stock tires, 3.21 gears to 37s with 4.88 gears. It shifts okay I think for the weight and tires, but there are times it really holds the gears and I use the auto stick to shift. I thought it was just normal, but it does bug the crap out of me.
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AgBass01
Caught the Bug
Got the jscan all setup and verified that gears ratio is set to 4.56. Also updated the tire size. Will see how things run tomorrow.
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BaddestCross
Active Member
You did set measured tire size, right? Measure from the ground to center hub then multiply by 2... Sidewall printed size doesn't work.
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Build Thread - Adventures of Fiona - https://wayalife.com/showthread.php?t=47407
BaddestCross
Active Member
Yeah, can't do it that way.
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Build Thread - Adventures of Fiona - https://wayalife.com/showthread.php?t=47407
Turbo21
New member
Measuring to the center and multiplying by 2 doesn’t work. The section of your tire that is contacting the road will be smaller than the top section. From center to top is a different measurement because the lower section takes all the weight of the vehicle and has a slight bulge to it. The accepted method is to use a level and measure from the ground to the top. It’s not much of a difference between the two but there is a difference
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jesse3638
Hooked
You are running 37's correct? Just wanted to confirm you measured 41.25"? Sounds like you're 4" over the size of the tires you're running. That could be the problem.
Turbo21
New member
No. 41.5” pittbull rockers. Actually measured exactly 41.5” when new. Lost about a 1/4” so far with wear
The only thing I haven’t tried yet is using the flashcal to return everything to stock and then using just scan to rewrite the gears. Then I could remove the flashcal from the equation
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nbunga
Caught the Bug
BaddestCross
Active Member
Lol. Yeah, I probably don't know what I'm talking about. Nor the thousands of others that do it the same way... Hope you figure out your issue.
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Build Thread - Adventures of Fiona - https://wayalife.com/showthread.php?t=47407
HighwayTrout
Hooked
The asshole who screwed everyone over by typing those instructions said so okay? lol
Eddie did a write up on how to accurately measure tires. Id start there
2nd.gunman
Caught the Bug
What effect does the top half of the tire have on anything?
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