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The mkiv Supra Owners Club

Are all jspecs restricted


gordy07

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My car was standard apart from the wheels when I bought it, but it wasn't restricted.

 

 

Is it common practice to unrestrict them when the speedo is converted?

 

Use the speedo converter (speed signal DIVIDER) to fool the ECU into thinking the car is going at 5/8 of its true speed all the time. This is especially easy if you want the odometer to be converted to record miles instead of km since the ECU and the other speed-sensitive systems all take their speed signal from the odometer. Therefore if you divide the signal going to the odometer you also divide the signal to all of the other systems (its not quite as simple as that, but please read on).

 

Note that this method does not actually delimit the car as the limiting software in the ECU is still active. Since the car thinks it is going at only 5/8 of its true speed, the speed "seen" by the ECU never gets high enough to trip the limiter. Hey presto - an effectively delimited car.

 

I gather that most importers use this method because you get it "for free" with a speedo / odo conversion

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