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A speed cut defender piggy backs into the computer on the loom and disables the 180km/hr limit... I think the S-AFC also includes speed cut functions??

Depends, many that come out of japan have had the limit removed by the time it gets here.

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You dont have to get a new computer. I got my line and the speed cut was off. I could go quite a way past the 180 mark.

Last time I had the dash off though i noticed some dodgy looking wiring behind the instruments, that could be whats stopping it. Not sure though.

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All imports are limited to 180km/h by law in japan i think?

this is incorrect i think the cut is more towards 190-200km last week i went out driving with a friend in our r33s we hit the speed cut several times and the needle hit 180 i was waiting for the engine to cut out but it took another 5 or so seconds with my foot to the floor before the engine cut out. The needle went past the 180 and kept going till I'd imagine a little past 190 then the engine cut out... :uh-huh:

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The best way to remove the speed limiter is with an Apexi RSM (Rev speed meter). This not only removes the speed limiter but gives you corect speed, revs, 1/4 mile, 0-100km/hr, shift light etc.

The analogue gauges in a standard instrument cluster are quite often out by a few %, which adds up when doing high speed, it is also good to know precisely what the revs are etc. For about $400 you get all this, a real bargain.

See'ya:burnout:

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Apexi RSM can't give correct 1/4, 1-100 etc as it measure engine revs. Wheelspin will affect your actual time (ie the RSM thinks your moving if the wheels are spinning). To get accurate times you need a g-tec or similar

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The 180km/hr cut is correct. At these speeds most guages are very inaccurate. Mine cuts in at what seems to be 190km/hr, but it is actually 180.

When you cut wire 53 into the computer you really need to put a switch onto it, as it can adverse side affects with power steering, HICAS and diagnostic functions. Plus who needs to have >180km/hr at their fingertips all the time?

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If you are worried about wire 53, read a thread called "free horsepower" on SDU forum, several guys did it with no adverse effects.

As for speed on speedo, mine is out by about 5% when compared to a power fc, also the tacho is not very accurate, it also reads a bit higher on the OEM guage when compared to the same, but not sure by how much.

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