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C. TOP-SPEED LIMITER
• Press the ‘N’ button to keep your vehicle’s stock top-speed
limiter and skip to the next option.
• If you have installed factory-approved high-performance
tires, press the ‘Y’ button to change your vehicle’s top-speed
limiter to match the speed rating of those tires. The speed
rating or speed symbol will be found on the sidewall of your
tires. Here are the corresponding symbols and maximum
top-speed limits that can be programmed into your vehicle:
D. TIRE SIZE
• Press ‘N’ if the original size tires are being used.
• Press ‘Y’ if you have installed tires with an overall height that
is different than the original factory tires. This feature will
allow you to adjust your speedometer and shift points (for
automatic transmissions) for the new tire height. The
▲ and ▼
arrows will allow adjustments of 1/4” increments. Maximum
and minimum tire height that can be adjusted depend on the
year, make, and model of the vehicle. Press the ‘Y’ button
to lock in the desired value. At any time you may press ‘N’
to allow you to either try again or skip to the next option.
TO ADJUST TOP SPEED LIMIT TO MATCH SPEED RATING OF HIGH-PERFORMANCE TIRES, PRESS Y
TO KEEP STOCK TOP SPEED LIMIT, PRESS N
USE UP/DOWN ARROWS TO ADJUST TOP SPEED LIMIT, THEN PRESS Y TO SELECT OR N TO EXIT.
_ – –_ _ _ MPH
S - 110 MPH
T - 116 MPH
H - 128 MPH
IF TIRE HEIGHT HAS BEEN CHANGED FROM ORIGINAL, PRESS Y
IF TIRE HEIGHT HAS NOT BEEN CHANGED, PRESS N
USE UP/DOWN ARROWS TO CHOOSE CORRECT TIRE HEIGHT, THEN PRESS Y TO SELECT OR N TO EXIT.
_ _._ _”
If you do not know your tire height, ask your tire dealer or measure a tire as follows:
1. Place a chalk mark on the tire where it contacts the pavement and also
mark the pavement. These marks should be at the center of the tire
footprint pointing straight down to the pavement.
2. Roll the vehicle in a straight line until the chalk mark makes one revolution
and is pointing straight down at the pavement again. Mark the pavement
again at this new spot.
3.
Measure (in inches) the distance between the two (2) marks on the pavement.
Divide the measurement by 3.1416. This will give you the tire height in inches.
IMPORTANT NOTE: If you have an 8.1L GM vehicle, the
next option to be shown on the programmer screen after the
tire size option will be transmission (Section F).
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