Wheel-s-pun

When you feel the need for speed.....


The maximum speed of many modern vehicles is governed by the onboard computer. The stock computer is programmed to shut down the engine when the vehicle exceeds the speed rating of the original equipment tires. But if you have installed tires with a higher speed rating for off-highway competition in sanctioned events, your vehicle may be able to achieve a faster top speed. A tire’s maximum safe speed under perfect conditions is marked on its sidewall. The codes for popular high-performance tires are: T = 118 mph, U = 124 mph, H = 130 mph, V = 149 mph, Z = 149+ mph...

As for removing the speed limiter, I highly doubt the dealer is willing to help you out with this one...It's not too difficult to do yourself as long as you have the ability toramp or lift the front of your car up enough to get to the transmission...

Here's the procedure.....

• First you must disconnect two sensors (presumably RPM limiters?) from the tranny. One is the fourth gear sensor, while the other is the fifth gear sensor.... If you look at the transmission under the car there are supposedly four (4) sensors, the ones that need to be disconnected are the middle two (2).... The electrical connections are simple snap lock configured so not cutting is required.....
• Once the two connections are disconnected, I recommend you thoroughly tape over the ends of the connectors to prevent moisture from entering within.... By doing this step the ECU doesn't know your 4th or 5th gear RPMs, therefore it won't limit you.

Note: If you have faith in placing your car on jack stands.....you can test the limiter for each gear before and after each step. What you'll find is that the ECU limits the top end RPM for 4th and 5th gear before you disconnect anything...

• The last step is to disconnect a control wire that comes from the tranny area and passes by the passenger side of the starter in the engine compartment. You'll find another simple electrical connection (looks like a tube style fuse holder) with small gauge wire....Unhook this connection....

Drive your car and you'll notice the speedometer doesn't work, nor do the number onyour odometer change. What you've disconnected is the sensor that transmits the speed to the ECU and the display. Now the computer tries to watch your speed to make sure you don't go past 115mph (S13 model, S14 may vary higher), but never cuts off your fuel since it doesn't have a clue how fast you're traveling.....

The above procedure is for nissan 240sx...so try on ur own risk...it isnt 100% efficient!!!!!!