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Old 01-24-2020, 07:51 PM
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Superchips tire size setting and tpms on off

I just bought a Superchips Flashcal for my 2013 JK. I went to set the tire size and wonder if I should set it at the tire size which is 35" or the actual diameter of the tire which is 34". Based on the fact I could set it accurately I'm assuming it should be the actual diameter of the tire. Then there is the ground to top of tire size which is yet a different option.

On the TPMS setting I was actually pleased to find there is an on / off setting as well as pressure. I read a number of threads that said there was not a way to turn it off but was pleased to find I could. No more tire light on my dash! When I buy new tires I'll get TPMS sensors installed (they were removed by the last owner) and turn it back on.

Is there a thread or website (didn't find one) that give good setting details to know what is the most accurate way to set these things?

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Old 01-24-2020, 07:53 PM   #2
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Measure your tire from the center hub to.the top of the tire and double that measurement. That's your diameter.

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Old 01-24-2020, 07:59 PM
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Measure your tire from the center hub to.the top of the tire and double that measurement. That's your diameter.

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Thanks! Got the diameter but was not sure the device wanted that or the "size" that the tire says it is. Thanks for clarifying that I want true diameter. I was guessing it was diameter which makes sense but wasn't sure if the device accounted for the difference or not.

Running back to the garage to reset now....
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Old 01-24-2020, 08:10 PM   #4
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You want the true diameter with the super chips. Also you may play with the tunings plus or minus a size and see if it works better for you

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Old 01-24-2020, 08:45 PM
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Just came in from the garage. I made a quick jig that helped me get the exact diameter which was 33 5/8. So I set it at 33.5 for now and will see how it feels and shifts tomorrow. Now I can get a real feel for things and decide if I want to re-gear since its still 3.21
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Old 01-24-2020, 08:47 PM   #6
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Your tire diameter is the starting point. To set it accurately, check your speed against a GPS speed on your phone. Then adjust the tire size until your speedometer matches your GPS speed.
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Old 01-24-2020, 08:51 PM
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Your tire diameter is the starting point. To set it accurately, check your speed against a GPS speed on your phone. Then adjust the tire size until your speedometer matches your GPS speed.
Great minds think alike Just sent the wife a text saying we could tweak it that way tomorrow on the way to the beach.
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Old 01-24-2020, 08:53 PM   #8
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Great minds think alike Just sent the wife a text saying we could tweak it that way tomorrow on the way to the beach.
Which beach you heeding to?
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Old 01-24-2020, 08:57 PM
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Which beach you heeding to?
Carolina Beach to drive at Fort Fisher and do some fishing for Blow Toads. Will get there late tomorrow and spend Sunday on the beach. Probably will drive the beach Saturday night in the dark to try out all the new lights.
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Old 01-24-2020, 09:07 PM   #10
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Carolina Beach to drive at Fort Fisher and do some fishing for Blow Toads. Will get there late tomorrow and spend Sunday on the beach. Probably will drive the beach Saturday night in the dark to try out all the new lights.
Cool, I be down there also Sat & Sun. I'll keep an eye out.
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Old 01-24-2020, 09:18 PM   #11
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33s and 3.21 was endurable for me, now I'm on true 35s and 4 56 gears and it is much better than 33s and 3.21 for sure.... it was a lot.to get it here tho

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Old 01-24-2020, 09:30 PM
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Cool, I be down there also Sat & Sun. I'll keep an eye out.
Sweet. Just look for the silver JK with crabs on the doors. I have to buy a new year pass so I'm hoping my code still works for Saturday night until I can get the new pass. Definitely will be on the beach Sunday though.
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Old 01-24-2020, 09:33 PM
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33s and 3.21 was endurable for me, now I'm on true 35s and 4 56 gears and it is much better than 33s and 3.21 for sure.... it was a lot.to get it here tho

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Yea, I have read that going to 4.56 is a happy place. Going to 4WD Parts on Feb 1 to get some ideas. I'll most likely get true 35" tires at the end of the summer when these are a bit more worn.
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Old 01-26-2020, 12:12 AM   #14
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Someone else on the forum posted a tip to measure from the ground to the center of the wheel. This is more accurate due to the weight of the Jeep causing the bottom of the tire to compress against the ground but not the top. I originally measured from the ground to the top of the tire using a level, and a second measurement from the center of wheel to top of tire, and came up with a measurement of 32.25" tire for my 285/70 Patagonias. I used this number but my speedo was still off ~1mph at 60 confirmed with a gps. Measuring from the ground to center of the wheel gave me a tire size of 32". I updated the setting with the Flashpaq and the speedo is a perfect match to the gps now.
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Old 01-26-2020, 12:15 PM
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Cool, I be down there also Sat & Sun. I'll keep an eye out.
Hate I may have missed meeting you. Didn't get to make it that way as my dog tore his CCL ligament (same as ACL in people). Between emergency vet and trying to find a brace then doing a design since I couldn't find a really good solution I didn't get finsihed until 3 AM this morning. Today I went out to get supplies to start building him a custom orthodic. Got the shells started and getting ready to start the build of of the shell (fiberglass resin and cloth).

Will be a long day getting this thing made! Dog "may" go for surgery but depending on how well I make this thing the Dr. may decide to wait and see how it heals on its own (basically will build scar tissue to compensate for the torn CCL.

Tough time, wife crying and dog scared as hell because he can't walk without pain.

Wish me luck on the orthodic! Built most everything in the course of my life but never anything for an animal to wear for the next 6 months.
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Old 01-26-2020, 12:19 PM
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Someone else on the forum posted a tip to measure from the ground to the center of the wheel. This is more accurate due to the weight of the Jeep causing the bottom of the tire to compress against the ground but not the top. I originally measured from the ground to the top of the tire using a level, and a second measurement from the center of wheel to top of tire, and came up with a measurement of 32.25" tire for my 285/70 Patagonias. I used this number but my speedo was still off ~1mph at 60 confirmed with a gps. Measuring from the ground to center of the wheel gave me a tire size of 32". I updated the setting with the Flashpaq and the speedo is a perfect match to the gps now.
Thanks for posting your findings! I set mine on actual diameter of the tire and the speed was spot on. I get your thoughts and even questioned if that might be the answer but based on math, the tire has to travel the diameter in distance regardless of the amount it sits down on the ground. Plus when at speed that compression actual changes depending on acceleration, climb or descent.
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