Telling the Jeep I just got bigger tires... - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 17 Old 07-10-2010, 04:29 PM Thread Starter
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Telling the Jeep I just got bigger tires...

How do I tell the Jeep I'm now running 35's instead of the factory wheels so the speedometer is accurate?

Also ... how do I disable the "low tire pressure" warning light/beep thing since I also put on new rims?
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post #2 of 17 Old 07-10-2010, 04:33 PM
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There are a ton of ways, searching will be most fruitfull. I used the ProCal programmer.

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post #3 of 17 Old 07-10-2010, 04:33 PM
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Well did you not put get your tire sensors swapped from the factory rims to the aftermarket rims? If not, you need a tuner.

To adjust the speedo you can pay the dealership to do it, or get a tuner...

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post #4 of 17 Old 07-10-2010, 04:39 PM
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Candle-light dinner, maybe some soft music......rub her on her hood, and just whisper to her "Hey baby, get ready for some bigger meat."

Just be gentle about it.


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post #5 of 17 Old 07-10-2010, 04:46 PM
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Superchips would be another option, recal speedo, shut off tpms, and get a little more power

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post #6 of 17 Old 07-11-2010, 11:12 PM
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X4 on the AEV Procal - it can take crae of both of your issues. And when / if you regear it can fix that for you to:
http://www.aev-conversions.com/products/procal_module/

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Last edited by TEXASKEV; 07-11-2010 at 11:19 PM.
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post #7 of 17 Old 07-12-2010, 02:01 PM
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Quote:
Originally Posted by TEXASKEV View Post
X4 on the AEV Procal - it can take crae of both of your issues. And when / if you regear it can fix that for you to:
http://www.aev-conversions.com/products/procal_module/
Went with Superchips that allows for tire and gearing mods. Very accurate. This weekend I will try the 'crawler' tune on my way down Cadillac Hill.
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post #8 of 17 Old 07-12-2010, 02:06 PM
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Originally Posted by OnTheRoks View Post
Went with Superchips that allows for tire and gearing mods. Very accurate. This weekend I will try the 'crawler' tune on my way down Cadillac Hill.
I wonder what the regearing feature actually does since the speedo takes its reading from the tone rings i.e. only tire size is needed for the correct calculation.
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post #9 of 17 Old 07-12-2010, 02:48 PM
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Quote:
Originally Posted by StubEXrube View Post
Candle-light dinner, maybe some soft music......rub her on her hood, and just whisper to her "Hey baby, get ready for some bigger meat."

Just be gentle about it.


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Fuck it, she is a Jeep. She is tough. Just ram the meat in the wheel well and tell her to suck it up! Pain is good. She a big girl. She can handle it!
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post #10 of 17 Old 07-12-2010, 03:36 PM
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Quote:
Originally Posted by ALASHA View Post
I wonder what the regearing feature actually does since the speedo takes its reading from the tone rings i.e. only tire size is needed for the correct calculation.
Letting the JK know about gear differences is important to the auto guys. It gets the shift points back wo where they are suposta be.

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post #11 of 17 Old 07-13-2010, 09:11 AM
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Quote:
Originally Posted by TEXASKEV View Post
Letting the JK know about gear differences is important to the auto guys. It gets the shift points back wo where they are suposta be.
Interesting. The DiabloSport Predator doesnt have the ability to change gear ratio, only tire size. They said this is because everything is keyed off the tone rings at the wheel so that makes me wonder....
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post #12 of 17 Old 07-13-2010, 09:17 AM
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Quote:
Originally Posted by TEXASKEV View Post
Letting the JK know about gear differences is important to the auto guys. It gets the shift points back wo where they are suposta be.
Quote:
Originally Posted by ALASHA View Post
Interesting. The DiabloSport Predator doesnt have the ability to change gear ratio, only tire size. They said this is because everything is keyed off the tone rings at the wheel so that makes me wonder....
Also with the DiabloSport Trinity.

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post #13 of 17 Old 07-13-2010, 09:21 AM
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Originally Posted by maverick View Post
Also with the DiabloSport Trinity.
Maverick,

You have become pretty close with DiabloSport by now Maybe you could get them to chime in on Tex's comment about shift points.
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post #14 of 17 Old 07-13-2010, 09:40 AM
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Quote:
Originally Posted by ALASHA View Post
Maverick,

You have become pretty close with DiabloSport by now Maybe you could get them to chime in on Tex's comment about shift points.
I don't know that 'close' would be an appropriate reference. I need to did in the Trinity manual. Just going through the screens it seems I'm able to alter shift "up" points, but I'm not sure about "down" shifting. Mike would have to clarify.

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post #15 of 17 Old 07-13-2010, 02:14 PM
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Quote:
Originally Posted by ALASHA View Post
Interesting. The DiabloSport Predator doesnt have the ability to change gear ratio, only tire size. They said this is because everything is keyed off the tone rings at the wheel so that makes me wonder....
Exactly, it's not that the tool cannot adjust, it's that it does not have to. The speedometer reading is taken (like you said) at the tone ring on the wheel after the differential in the axle, not before (on the tailshaft of the transmission as it was on the earlier Wranglers) so you only have to adjust the speedometer when changing the tires to a non-stock diameter.


As far as the shift points and low tire pressure threshold are concerned, I'll modify what I posted in another thread as it pertains to this one:

The Trinity is akin to having 40-50 Predator part numbers in one device. When you enter the vehicle's information it essentially configures the Trinity's tuning functions into the appropriate Predator part number. In this case, a U7137 that can be viewed here:
U7137 Products Page
After you enter your vehicle's information under CHANGE VEHICLE TYPE, it will then reset itself, formatted to tune a vehicle as if it were a U7137. Both the low tire pressure threshold and shift points can be modified on a JK with a Trinity or Predator.

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post #16 of 17 Old 07-15-2010, 02:48 PM
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I did a regar to 4.88 and I have the Superchips, also did 35 inch tires that measured 34.25 from the ground to the top of my tire I reprogrammed my tire size and gear ratio and my speedo is dead on, I tracked it with my gps this morning.
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post #17 of 17 Old 07-16-2010, 07:58 AM
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Quote:
Originally Posted by Rustler View Post
I did a regar to 4.88 and I have the Superchips, also did 35 inch tires that measured 34.25 from the ground to the top of my tire I reprogrammed my tire size and gear ratio and my speedo is dead on, I tracked it with my gps this morning.
Yep, measured height is the best way to do it. Tires are like shoes: a size 12 Nike often isn't going to fit the same as a size 12 Converse.

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