Speedometer Calibration

Aidy · Post by **Aidy** » Fri May 16, 2014 9:38 pm

Dear JK owners with bigger tires, just wanted to check how you have calibrated your speedometers and whether the computer programmers are really beneficial and which ones?

Thanks

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iguana · Post by **iguana** » Fri May 16, 2014 10:52 pm

Easy ... Just calculate 10 KMs below the speedometer speed ... Thats your actual speed

Aidy · Post by **Aidy** » Fri May 16, 2014 11:20 pm

Lool that's what I currently do but need to fix that pretty soon

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Millhouse · Post by **Millhouse** » Sat May 17, 2014 1:38 am

iguana wrote:Easy ... Just calculate 10 KMs below the speedometer speed ... Thats your actual speed

If the tyres are bigger then your actual speed will be higher than what the speedo is saying...

iguana · Post by **iguana** » Sat May 17, 2014 7:45 am

Try this, I didn't try it ... But see it and if it works, tell me

https://itunes.apple.com/us/app/jk-cali ... 66038?mt=8

Millhouse, You are right, When your tires are bigger, the new speedometer reading is actually lower than the actual speed ..

So if your real speed is 120, the speedometer will read it as 110 .... Now Aidy's problem are the radar cameras ofcourse, he want to ajust his speed to the legal road speed .... So if his speedometer is reading 120KM/H, it actually means that his actual speed is 130 KM/H and he gets a ticket ... That's the explaination of my advice

BlackBird · Post by **BlackBird** » Sat May 17, 2014 8:12 am

Anyone heard of a little thing called GPS? I "calibrated" my speedo using my GPS. I know that if my speedo reads 113, I'm actually doing 120. With the 32" tyres my TJ speedo reads 7kph low.

iguana · Post by **iguana** » Sat May 17, 2014 8:33 am

I think Aidy is very lazy ... He wants to read one speedometer ... so he wants his car speedometer to give him the correct speed limit.

I am a lazy guy and I know how lazy people think

kastrato · Post by **kastrato** » Sat May 17, 2014 9:29 am

You can get a chip tuning which in theory will give you some extra power and fix your speedo.
In practice wont do any of these and you still will calculate 10 km/h more that your reading on the clock.

Aidy · Post by **Aidy** » Sat May 17, 2014 9:32 am

Hahaha actually it's not the radar cameras that I'm worried about. And yes Blackbird I've adjusted to the difference in speed through GPS.

What worries me though that the ESP may not be functioning properly especially after a lift and causing strange drive reactions

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kastrato · Post by **kastrato** » Sat May 17, 2014 9:49 am

If the geometry of the car is still ok after the lift the esp will work fine.

Aidy · Post by **Aidy** » Sat May 17, 2014 12:06 pm

kastrato wrote:If the geometry of the car is still ok after the lift the esp will work fine.

We'll it seems the empty every pocket theory will start. Adjustable front trac bar, control arms ....

kastrato · Post by **kastrato** » Sat May 17, 2014 12:22 pm

Gents,
The car has a factory set up.
When you change something, like lift, you need to make sure that you still maintain the geometry, otherwise the car won't behave correctly.

Code Red · Post by **Code Red** » Sat May 17, 2014 3:48 pm

Different effective gearing, whether through bigger tires or a gear change will affect speedometer, traction control, anti-lock brakes, and modern automatic transmissions. Most of the chip or programmer manufacturers include a function to recalibrate your Jeep's computer to the new effective gearing.

Aidy · Post by **Aidy** » Sat May 17, 2014 6:03 pm

Any particular programmers with better first hand experiences in the club?

Btw just got the AEV geometry brackets

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kastrato · Post by **kastrato** » Sat May 17, 2014 10:53 pm

I have used the diablo and the procal.
The diablo claims extra horsepower the procal only calibration.
With diablo I felt better throttle responce withe procal no difference at all.
With both the speedometer is still reading 10 km less.
With my jKU I had an issue with the esp.
The procal didn't solve it.
Apparently the jk have a sensor in the steering column that sense is the steering is in 0 degrees.
If your front axle is not centered properly is getting confused and hits the esp.
An adjustable front track bar centered the axle and the esp went happy again.