Moorron
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| posted on 29/1/09 at 01:25 PM |
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ZX12R speed limiter, what revs?
Afternoon guys.
Im looking at that nice Excel spreadsheet that i got from of someones signiture on here that lets you select your engine, diff and wheel sizes to see
a nice graph of the speeds in each gear. But it doesnt take into account the inbuild rev limiter in 6th gear on the ZX12R bike engine which is there
to limit the bikes speed. Does anyone know what this is at so i can adjust the graph to represent my car installation?
Google didnt help and i couldnt work it out without going mad.
Cheers
Sorry about my spelling, im an engineer and only work in numbers.
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MikeCapon
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| posted on 29/1/09 at 01:29 PM |
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On the bike the top speed is limited a very reasonable 299kph or 186mph. If you know the bike's gearing that should tell you what revs this
equals.
ETA Looking here it seems pretty simple to bypass the top
speed limiter. In fact it works from the speedo so you're going to need to mod this anyway.
[Edited on 29/1/09 by MikeCapon]
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minitici
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| posted on 29/1/09 at 04:33 PM |
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If you install a Speedo Healer, it has two selectable settings.
One can be used for correcting the speedo reading, the other can be set to eliminate the 6th gear rev limit.
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Hellfire
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| posted on 29/1/09 at 05:37 PM |
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The only model ZX12R that was derestricted as stock, is the A1 model. All other models since then have an imposed 186mph speed limit restrictor built
into the ECU. The Bonneville Box is available for the A2, B1 & B2 models only and de-restricts the speed limiter in 6th gear by fooling the ECU
into thinking that the bike is going slower than it actually is. So on these models, the Bonneville Box does work.
Apparently a yellow-box/speedo healer can also achieve the same thing by reducing the speedo readout. What seems to be a bit of a grey area though, is
where the ECU gets its signal from and whereabouts you connect the yellow-box in relation to the ECU and speedo to achieve this.
In the real world, a Bonneville Box will give you maybe an extra 10mph max, when you’re flat out in sixth. Apart from a run on a dyno at Holeshot, I
have never seen 12,750rpm in sixth gear. Even if you had the box fitted, you’d probably run out of straight road in a seven before its effects were
felt.
Phil
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Moorron
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| posted on 30/1/09 at 08:32 PM |
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cheers. looking into the net some more shows its at 10200rpm. Only one way to test it lol
Sorry about my spelling, im an engineer and only work in numbers.
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