Adjusting tire size and even changing axel ratios is easy with DiabloSport and BNR!

Step 1: Select Advanced Tune

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Step 2: Select Install Custom Tune (This is for the Engine Tune)

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Step 3: Select BNR ENGINE

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Step 3A: Select YES to confirm

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MANUAL TRANSMISSION VEHICLES SKIP TO STEP 6

Step 4: Select Install Custom Tune (This will be for the transmission tune)

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Step 5: Select BNR TRANS

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Step 5A: Select Yes to confirm your selection

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Step 6: Select Modify Parameters

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Step 7: Select ECM

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Step 7A: Press the down arrow until you see Speed Calibration, then select it.

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Step 8: Select Tire Size

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Step 9: Modify the tire size by tapping the appropriate area. You can input sidewall info, or height in inches.

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Step 9A: Tapping on the field you want to enter values into will bring up the number pad. Enter your values, and tap ENTER to input.

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Step 10: You will be brought back to the "Modify Parameters" Menu. An asterisk ( * ) next to the parameter indicates that it was successfully modified. Tap the Back Arrow to exit this menu when you have finished adjusting all parameters.

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Step 11: You'll be taken back to the ECM/TCM Parameter Modification menu. Tap the Back Arrow again.

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Step 12: Apply the Tune

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Step 13: Wait for the tune to finish flashing, and follow any on screen directions

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