JSCAN Jeep tire size / axle ratio change - better shift

[@vlchk]

For the record (JScan staff here): after changing tire sizes you don't really need all those procedures. It's enough to leave the car turned off for a few minutes, and it should catch up and realize the tire size has been changed.

[@JWard2]

O I saw a comment from Piotr on Jscan Facebook that mentioned it

[@JWard2]

I'll pin this post now

[@seigle6844]

Sorry. Just to be clear. Once I’m done and have disabled the initialize EGS. Do I still have to restart all ECUS and drive the JK? And do WOT 3-4 times? Or do I just stop and leave the jeep off for a few minutes after I disable the initialize EGS?

[@JeffLenney]

Hey Gregory, so do you need to adjust the ECU,EGS, shift points and all he did? I'm putting 35"s on my jeep next week, and want to do it right in as few steps as possible. 🙂

[@vlchk]

@@JeffLenney you don't have to, but if the jeep feels clumsy and slow, it'll help. First adjust the tire size in JScan and see hoe it drives. Then you can consider the transmission relearn. Reach us (JScan) via fb message, I'll get you the links to the documentation

[@vardfriki7274]

This completely transformed my Jeep.

[@JWard2]

Heck yes! So good to hear this. Have a blessed weekend

[@jhonyflores56]

Thank you so much for this video. I bought this Jeep jk diff went bad and by the vin the dealer said I had a 3.73 it turns out it was a 3.56 ratio. I found out by the program. I followed your procedure and it worked out all well. Thank so much!!!

[@JWard2]

That is awesome! Glad it worked out well. Feel free to join the Facebook group Jscan JK owners for other modifying ideas with jscan

[@jhonyflores56]

@@JWard2 will do thank you

[@virgilsmith5792]

Thank you. I did tire size and transmission reset today. My tranny had been sluggish and now shifts much better. 2014 Jeep Wrangler JK Unlimited

[@no_handle_required]

My dealer wouldn't even do this. What a joke. Thanks for this, one amazon order and I can do it myself.

[@JWard2]

You're welcome ☺️

[@AndyMena21]

This settings will help you a lot if you follow his steps just how he saids👌🏼👍🏼💯

[@Neco87]

Replaced the EGR valve. Resetting the ecu's afterwards should be done correct?? Ohh its a 07 Jk Wrangler by the way

[@chris_hansen]

Helpful video with great detail. Thank you!! For others who decide to do this, do note, however, this is specific to the JK model Wrangler. It works for the JL but the JL model is slightly different in that there is no "Initialize EGS" option so that part does not apply. As to whether to reset the TCM adaptives, that option is there but some comments from JScan suggest that may or may not be necessary.

[@JWard2]

Thank you!

[@SertEngineering]

What a great video. Hopefully it would work on my jeep.

[@michaelphelpsmaxrealtyllc5810]

Assuming that’s strictly for automatic transmission? I won’t have to do that for my 6 speed manual after I regear, correct? Obviously I’ll change the axle ratio, but not the transmission items you changed after that. Can you please confirm.

[@JWard2]

Yup you're correct

[@regularguyfixes3142]

Automatic decides when to shift for you. The computer hasss to know you got bigger tires to adapt to that and change the shift point. On a manual shift YOU are the shifter the computer. YOU decide to go to 5000rpms or 2000rpms then shift that's up to you the computer and JScan have nothing to do with a manual shifter. I would delete that comment if you don't wanna catch hell from the the Jeep world that you have a manual shifter and don't understand that...

[@chadmaynard8080]

Should probably still do it for the speedometer

[@jonathanrasay]

Will this be the same for Ram 1500?

[@ElevatedVehicles]

I'm unsure

[@nrgsergmcjoule8404]

Great tutorial. I reset my tire size and it looked like everything configured fine but I had an error code "not detecting tcm" with the light for the car and squiggly lines on. Wasn't sure why that came up so I cleared it and went on to work. Car feels and shifts better. Should I look into that error message still?

[@JWard2]

Just saw this. Did you get this figured out?

[@nrgsergmcjoule8404]

@@JWard2 good. Thx

[@wheezin_mtnbkr3576]

Thanks for the tutorial, but where did you learn that several WOT shifts were necessary? The Nag1 service manual states the opposite for a adaptive reset, specifically instructing the technician to do several coast downs, and gentle (under 1800rpm) shifts up to 5th gear.

[@JWard2]

Jscan themselves mentioned it on the Jscan Facebook page

[@vlchk]

@@JWard2 I'm not sure if it was us who said that, or was it somebody else who claimed that. I was rather inclined to gentle "introduction" to the driving style. I'll discuss that with the rest of the team.

[@JWard2]

@@vlchk O I saw a comment from Piotr on Jscan Facebook that mentioned it

[@vlchk]

@@JWard2 we have a slightly different opinion then :)

[@ARC928]

Where did you get the procedure instruction from? very different than the maker of Jscan instruction.

[@JWard2]

From Facebook JK Jscan owners group

[@Dwq47]

Mine says “specific vin has no license assigned”… so do I have to buy a license to change the tire size? Thought this app was free?

[@JWard2]

Yup you're right. The app is free. But the license to change parameters is what they charge $ for

[@TarheelNomad-i4z]

I have had a RIPP Supercharger with a HP Tune installed. Will I still be able to change the tire size, gearing ? If I change the gearing and shifting ok do I need to do the TCM stuff ?

[@gsxr800]

After you set the EGS to disable the key is still on. In the next step you say not to turn the Jeep back on. There was never any step to turn it off so it’s still on.

[@JWard2]

Touche I'll need to correct that

[@scottcarter2202]

@@JWard2 So what's the correct steps here. Turn off after setting to disable? Or leave it on?

[@virgilsmith5792]

@@scottcarter2202 I was writing everything down and when he said that..it threw me off and not wanting to do it. Maybe he meant..don't turn it off

[@tiffanymcphall5539]

Is there another way to reset the trans? Don’t really feel like doing WOT pulls on brand new gears😅

[@JWard2]

Yes the wide open throttle is for those that have been having poor shifting (like hanging in a gear too long before upshifting on the 5 speed)

[@JWard2]

So you don't have to do wot in your case

[@tejano2828]

I have been using this App for years it's great but I have a question. My buddy changed his engine out and he is getting 4 mpg and super sluggish. Is there some settings in this app tht could help him?

[@abdullahbaqer6943]

How to calculate the tire size with axle ratio ? I have tire size 31.75 inch .. thank you

[@jeseefcm]

So don’t turn the EGS back to active ?

[@ryanbishop1987]

Do you still do the Initialize EGS after a tire size change if you have the 4 speed transmission from 2008?

[@woof3598]

in the process of ordering one, 2 choic's blue tooth or wifi, either one better ?

[@JWard2]

I got the Bluetooth one. Reports on the Facebook group is that it's a better connection

[@shaskhim]

Great job! Does any body know how can i do it on KIA & Hyundai? I've searched a few days, but didn't find something helpful for my KIA Picanto yet. I've just changed the tire size and have some problem with the speedometer. Any helps on this would be highly appreciated.

[@douglashardy177]

Would these steps be the same for a 5th gen Ram ecodiesel DT?

[@JWard2]

I've never tried it

[@rickl571]

hi there I know this is an old past video but i wanted to see if you could explain the WOT part read some info and still cannot understand how to do this and I really want to do it because ounce in a while while driving i hear the engine just revving up the RPM's but not actually stepping on the gas that hard and the veh not going that fast either, sometimes it does this when actually coming to a stop because of a light and I'm actually stepping on the brake, let me know thanks

[@JWard2]

I'm not sure I understand what you mean

[@opticsmedia.official]

Will this work 2011 Jeep Liberty?

[@kyledehn2699]

Also note that location along side bluetooth has to be on in some applications..

[@dansmith4061]

So what is Jscan and how do I get this for my 18 Sahara

[@JWard2]

Jscan is a smartphone app. You can find it on Google Play store and I think on the apple app store but I'm not sure cause I don't have an apple. Then you'll want a obd Bluetooth dongle like this one www.amazon.com/dp/B076XVQMVS/ref=cm_sw_r_as_gl_apa_gl_i_FNQ7X3H4QBN395S2X5AA?linkCode=ml1&tag=jj2ward-20

[@ARC928]

On a 2007 JK, do I need to do Restart all ECUs after I Initialized EGS ?

[@JWard2]

For 2007 I'm unsure admittedly

[@ARC928]

@@JWard2 The guy from Jscan has a video about this but didn't mention the EGS so I was wondering why

[@JWard2]

@@ARC928 interesting! I'll have to find that video

[@ARC928]

@@JWard2 kzbin.info/www/bejne/eIOkZ5WijseWg7s

[@ARC928]

@@JWard2 Did you get a chance to watch the video from Jscan?

[@healyeston222]

Not sure what happened but as soon as I did the reset all ecus my traction control light and abs light or on now, also the ETC is flashing and it idles at 1400rpm. With about half a dozen codes for the throttle body. I tried a new throttle body and still the same thing. Not sure if I messed something up doing this or what

[@JWard2]

Holy shit. Have you posted the codes over on the Jscan JK owners Facebook group?

[@healyeston222]

@@JWard2 no I haven't. Didn't know there was a specific page for that. I'll look into it. Thanks!

[@sambrandt4755]

I did this on my liberty and it's giving me a c1078 tire revolutions range performance fault code. Any idea how to clear that?

[@JWard2]

Ooof, yea not sure mate. I have a wrangler.

[@rickl571]

My jeep adaptation page does not have the EGS part but I can see under transmission 2 quick learns one short - long and the TCM reset adaptation values option which is the last you did, soooo do I go from changing tire size to the TCM reset???

[@JWard2]

Yes that would work. Perhaps Jscan updated something in the app since I posted the video

[@rickl571]

@@JWard2 hey there, thanks for answering but I just wanted to ask a dumb question because I’ve never done what you mention as last step, what or how do you do a WOT ?? 🤷‍♂️🤔

[@JWard2]

@@rickl571 o gotcha. My mistake. WOT stands for wide open throttle. Meaning from 0mph, mash the accelerator pedal & keep it down until the Jeep has gone through at least the first 3 gears (this is only for the automatic of course) & you'll want to do it in a safe area with traffic not around. Some say going WOT helps with the adaptive transmission reset.

[@Aceinfinity-le8zc]

How do I reset it back to factory settings ?

[@MrMikek71]

i used jscan and followed steps in video changed tire size from oem setting 30.04 to anything above that i get a b222a code and park sense unavailable. anyone have a fix for this. i have a 2018 jeep grand Cherokee high altitude

[@tawfiqalezz7154]

Thank you , I have jk 2013 and I follow up the instruction in your video but unfortunately, the car won’t shift at higher rpm .. it seems it stuck at certain gear .. how can I go back to normal drive , I have auto gear

[@etomlinson11]

Just got 4.88s did the procure like jscan says, and mine keeps doing the same thing

[@Megatron0405]

@@etomlinson11 what fixed your issue?? I just put 4:88 and having a terrible time trying to find a fix for shift points

[@etomlinson11]

@@Megatron0405 still having slight problems, I did what the guy shows in the video, will test tomorrow if it changed anything

[@Megatron0405]

@@etomlinson11 can u plz let me know I’m having a hell of a time trying to figure this out

[@etomlinson11]

@@Megatron0405 for sure

[@shawnshawn4991]

Any towing tutorials?

[@mariusdocea438]

Thanks !

[@JWard2]

You're welcome

[@unforgiven101inc]

somebody told me this thing can program a new key, how...help

[@ElevatedVehicles]

Link below. Consider subscribing to my channel for more Jscan how-to videos kzbin.info/www/bejne/gXXIZY2NjbCIorssi=2kF8Svp6W4DkcQgF

[@guillermobarrera717]

What if my tire size is 305 60 18? If a measure its 31's, but its more wider than an normal 31, which do size do you recommend to select?

[@JWard2]

Width doesn't matter to the computer. Measure from the ground to the middle of your wheel. Multiply that number by 2. That is the tire height to put in

[@guillermobarrera717]

@@JWard2 but it will be a heavist tire than a normal 31, from oem the tire size is 31, but I feel the jeep slowly and the shift are larger

[@JWard2]

@@guillermobarrera717did you follow the steps after changing the tire size? Resetting the transmission, etc..?

[@guillermobarrera717]

@@JWard2 no, because, I didnt change the tire size

[@JWard2]

@@guillermobarrera717 ok you'll want to start by measuring your tire & follow the video

[@sevpva12]

Mine doesn’t have tcm-reset learned adaptives

[@JWard2]

Do you have the latest update from Jscan? Do you have a JK or JKU?

[@sevpva12]

@@JWard2 I have a JT

[@JWard2]

@@sevpva12 you'll want to reach out to Jscan

[@franksilverstein3339]

What if you have a MANUAL (Real Mans) TRANSMISSION ???

[@cuen_recon6662]

What do I have to buy for a JL?