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The speed is electronically controlled by the PCM. Its set at the factory depending on the tires installed on the car when new. This is so you cannot over speed the tires. So, read the speed rating off the tires on the car like 97S, H or Z etc. Deduct about 20% and this will give you an approximate idea how fast it will go per the factory defaults. My Deville shuts down at 112 m.p.h. because it has comfort tires not performance tires.

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16y ago

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