zx9rmal
Novice Class
Posts: 75
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posted May 25, 2006 06:45 PM
Speed limiter idea
I did a top end run after I changed to a 16T front sprocket. The bike accelerated hard in 6th gear right up to 10,500 rpm, then just stopped. It felt like the motor would have easily pulled the redline if it weren't restricted. I assume the ECU is getting the speed limiting signal from the sensor at the front sprocket cover.
So here's my idea: suppose I disconnect that sensor, measure the resistance of the sensor, and then insert a resistor with the same resistance in the connector to the sensor.
If the ECU is getting the same resistance, but no rpm signal, might that disable the limiter??
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Mal Glanz
Ft. Lauderdale, FL
'12 ZX-14R
  
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fish_antlers
Administrator
The Truth is Out There
Posts: 21895
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posted May 25, 2006 06:47 PM
talk to ridgeracer on the 12r side... he knows all.
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What business is it of yours where I'm from, Friendo?
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ZXLNT
Needs a job
Kawpuke Extraordinare
Posts: 2853
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posted May 25, 2006 08:13 PM
 Edited By: ZXLNT on 25 May 2006 21:50
The speed sensor doesn't operate on resistance. It uses a "hall effect sensor" to send pulses to the ECU or Speedometer.. The more pulses per second that faster the speed the ECU/Speedometer registers... It operates basically the same way a camshaft sensor or crankshaft sensor operates.
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dubious
Needs a life
Needs more time to ride!
Posts: 8442
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posted May 25, 2006 08:34 PM
won't that effect the speedo too.
The ecu and speedo get the signal from the same place no?
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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ZXLNT
Needs a job
Kawpuke Extraordinare
Posts: 2853
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posted May 25, 2006 08:47 PM
Well that isn't known at this time I dont think. On the 12R the speed sensor only connected to the speedometer and not the ECU. I dont know about the 14.
I guess the way I wrote that above it sounds like I know it connects to the ECU, that was assumption on my part. It may or may not send a signal to the ECU..
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ZXLNT
Needs a job
Kawpuke Extraordinare
Posts: 2853
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posted May 25, 2006 08:50 PM
I edited my original post by the way...
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dubious
Needs a life
Needs more time to ride!
Posts: 8442
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posted May 25, 2006 08:52 PM
ok, so the zx12r sensed gear position and rpm to retard timing at top speed?
if so hopefully zx 14 is the same, but I thought motorad magazine was able to disconnect the countershaft sensor, for a couple of minutes, then ecu went into error code, limp mode.
If I remember right, this allowed them to run top speed for 1 run at a time, then had to reset error code
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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fish_antlers
Administrator
The Truth is Out There
Posts: 21895
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posted May 25, 2006 08:54 PM
Edited By: fish_antlers on 25 May 2006 21:54
why dont you guys listen to me.. go ping ridgeracer on the 12 side of the board or find his hack on i-hacked.com . it will answer a lot of questions and give you a good starting point (if not a solution)
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What business is it of yours where I'm from, Friendo?
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ZXLNT
Needs a job
Kawpuke Extraordinare
Posts: 2853
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posted May 25, 2006 09:00 PM
quote:
ok, so the zx12r sensed gear position and rpm to retard timing at top speed?
No I didn't say that at all.
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dubious
Needs a life
Needs more time to ride!
Posts: 8442
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posted May 25, 2006 09:00 PM
Edited By: dubious on 25 May 2006 22:02
quote: why dont you guys listen to me.. go ping ridgeracer on the 12 side of the board or find his hack on i-hacked.com . it will answer a lot of questions and give you a good starting point (if not a solution)
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we like pretending your not here to piss ya off. LOL 
they started one already !
Thanks fishy. 
You bin pretty quiet these days, ridin much?
Gettin a 14 or what big guy?
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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ZXLNT
Needs a job
Kawpuke Extraordinare
Posts: 2853
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posted May 25, 2006 09:00 PM
I dont want to listen to you, I want to discuss this and use up your server space with my threads..
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speedgene
Zone Head
Posts: 996
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posted May 25, 2006 10:07 PM
On the gear position switch junction box, there are 3 wires. The green is neutral - Green/Red are the 6 gear readings - Black wire is a resistance wired after 3rd gear. Since all 6 gears are wired in series, it might read across the board as if the black (resister) wire was out of the loop for the upper 3 gears.
This is a fast check since your bike can hit 6th/redline pretty fast geared this way. Try first, the gear position wire harness. Pull the black wire from behind the junction box, or pull the plug apart, and wire the green to green, and g/r to g/r wires back together only. Test ride and report.
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E-tard
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tuusinii
Pro
Posts: 1031
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posted May 25, 2006 11:55 PM
The ZX12 uses speedsensor to limit top speed. On all other than 00' model the speed sensor goes also to the ECU.
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zx9rmal
Novice Class
Posts: 75
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posted May 26, 2006 09:59 AM
Well, continuing on, I disconnected the front sprocket sensor. It's a 3 wire connector. On the sensor side, I measured resistance at about 17k ohms between 2 of the 3 contacts. The other 2 combinations had no resistance. On the hot side, with the key on, I measured 12v between 2 contacts, and about 5v between 2 other contacts. The 3rd combination had no voltage.
If I were to leave the connector disconnected and put in a 17k ohm resistor connecting the 2 appropriate contacts, you don't think this would eliminate the limiter, since the ECU is not getting the signal but IS getting a complete circuit??
Also, how about just leaving the sensor connected, but removing it from the sprocket cover, so as to eliminate the signal?? I don't really care about the speedo operation.
Last, how about somehow isolating 2 of the 4 corners of the countershaft nut, so as to reduce the signal by 1/2??
I'm sure I'm a bit over my head here, but I just thought I'd check out these ideas I have.
Thanks.
____________
Mal Glanz
Ft. Lauderdale, FL
'12 ZX-14R
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