posted September 15, 2002 11:28 AM
Yellow Box! Some questions in have on yellow box after reading some old threads on Easy's home page...
1] best mounting point.. behind gauge cluster or under seat
2] Wiring... Again behind cluster or this a a quote from a post of CKARLEWICZ...
"Programming it is very easy. I mounted mine under the seat on the outside of the rear box. The only thing you have to figure out is where to tap into the speed sensor. You can tap in right behind the guages. I didn't because I wanted the ECU to see the adjusted reading also. By tapping in behind the guage, the ECU still sees the uncorrected reading. I tapped in at the speed sensor itself. Was a little tight working on it down there but it turned out pretty good."
2a] Is there any truth in this and what are pros and cons?
3] also read that the correct setting on yellow box is 12% is this also true for the 02'
4] Do i really need a gps?.. If so anyone in NC want to help me out... Also heard if you get it dyno'd that can help set it correctly....? dunno?
posted September 15, 2002 12:42 PM
i would rather the ecu saw the uncorrected speed. i'd imagine it expects and calculates based on the uncorrected speed, if it uses speed to calculate anythign to begin with.
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posted September 15, 2002 05:38 PM
Edited By: swft on 15 Sep 2002 18:41
The speed sensor goes straight to the speedo. The two wires in question are the purple and yellow wire coming from the speed sensor, and they go directly to the instrument cluster. The ECU in the bike calculates speed via engine rpm and transmission gear. So mounting the yellow box under the seat or behind the instrument cluster is entirely up to you. Either place will work. Personally, I prefer behind the instrument cluster, but I could see how under the seat might be nice too. So you can tap in down by the speed sensor, or up by the instrument cluster, it doesn't matter. And a gps is a good way to set it, but you will have to observe the difference, stop, make the adjustment, then repeat. On the other hand, a dyno operator can put your bike on the dyno, take it to *exactly* the speed you want, then set the yellow box to make the speedo accurate, in one shot. No explaining to the state patrol "I was just trying to set the correction factor on my speedo! Honest!".
posted September 16, 2002 08:29 PM
AH...17t...have you installed your yellow box yet? and have you had a chance to ride your bike with the 17t on it?
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posted September 16, 2002 08:36 PM
no yellow box yet... still trying to get more info where i should wire it up to... Have not ridden it yet but will tomm......
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VOZ
posted September 16, 2002 09:12 PM
Swft has installed about a half dozen of them I believe. Maybe more. Three for me, one for fish and at least a couple of his own as well as some other customers. I seriously doubt that you will find a more informed guy. Don't let him know I said that or his head will swell and that could cause him to experience pain in his rectum!!!!
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To those who do not count their life in years, but in how life
has touched them in the past and how much it can hold in the
future; -- Youth is forever.
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posted September 16, 2002 09:16 PM
The yellow wire comes up from the speed sensor. It's housed in a sturdy grey tube that cuts easily. I just put a yellow box on my silver 12r tonite. Took a total of 20 minutes, including testing. I cut back the grey tube, then the black tape around the wires, then spliced in the white and green wires. I decided to put the yellow box up beside the fuse box. There's room on the left side for it, between the fuse box and the wiring loom. Then it's a very short run with the red wire for power, and the black wire to a ground. I'll have to post pics tomorrow morning.
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82 Gpz750, 84 Ninja 900, 2000 ZX12R (Muzzy Big Bore Kit), *another* 2000 ZX12R (Muzzy custom stroke crank 1341cc motor), 2004 ZZR1200, 2005 ZX10R, 2007 ZX14, 2008 Concours 14, 2014 Versys 650, 2014 Yamaha WR450F, 2015 Ninja H2
posted September 18, 2002 05:00 AM
GREAT PICS SWFT!!... is it true that wiring it there does not let the bike reach the rev limiter as fast as it would if wiried per yellow box instuction?....
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VOZ
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posted September 18, 2002 06:34 AM
*blink* What? I'll repeat my earlier post. The speed signal does not go anywhere except to the speedo. The ECU calculates speed from engine rpm and gear position. The Yellow Box instructions do not state a specific location.
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82 Gpz750, 84 Ninja 900, 2000 ZX12R (Muzzy Big Bore Kit), *another* 2000 ZX12R (Muzzy custom stroke crank 1341cc motor), 2004 ZZR1200, 2005 ZX10R, 2007 ZX14, 2008 Concours 14, 2014 Versys 650, 2014 Yamaha WR450F, 2015 Ninja H2
posted September 18, 2002 08:53 AM
SWFT... what can i say i'm hard headed and a little slow....but bike plenty fast.... AGAIN THANKS!!!
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VOZ
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posted September 18, 2002 08:58 AM
Glad ta help! Fish, if you would like your 12 retrofitted to this layout, no charge to do it, just bring the bike by.
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82 Gpz750, 84 Ninja 900, 2000 ZX12R (Muzzy Big Bore Kit), *another* 2000 ZX12R (Muzzy custom stroke crank 1341cc motor), 2004 ZZR1200, 2005 ZX10R, 2007 ZX14, 2008 Concours 14, 2014 Versys 650, 2014 Yamaha WR450F, 2015 Ninja H2
posted September 18, 2002 09:10 AM
Edited By: redelk on 18 Sep 2002 17:27
Check it out. Don't know if what is in this thread is true. Have never seen it disputed, though.
posted September 18, 2002 12:04 PM
Edited By: redelk on 18 Sep 2002 17:27
Here we go. This is the old info I was looking for! Yes, indeed - the 2001 and 2002 model ZX-12R DOES send a signal from the speedo sensor to the ECU.
Thanks for the edits creating the active links. What do I need to do to make that happen next time? [I suppose I should have researched THAT a little, too!]
Voz -
I see on Easyrider's site that you got your Yellow Box installed. That's cool. You didn't say where you tapped into the yellow wire (speed sensor signal wire), but hopefully you know now that IT DOES make a difference where you splice into that wire! If you splice into it up near the instrument cluster (as many '00 owners have done) you will be able to dial in the Yellow Box for a correct speedo reading but will reduce your 17/46 geared '02 model top speed to something less than 186 mph. If you spliced into the yellow wire somewhere near the vehicle speed sensor itself (and prior to the point where that circuit branches off into two directions) you will send the corrected signal from the Yellow Box to the speedo AND the ECU --- exactly what you want to do on the '02 model.
Will inform further if needed. Need to know how your install worked out before I put out any more effort!!
posted September 18, 2002 06:24 PM
did it per SWFT instructions...hopefully it'd correct...but please let me know your thoughts and exper advice... i need to borrow a gps to make sure thigs are running correct!
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posted September 18, 2002 06:33 PM
Whoa - I looked at the 2000 wiring diagrams again - I missed the split off to the ECU. So yes, it does matter where you take the signal from the yellow wire. My bad!
posted September 18, 2002 06:40 PM
AAAAARRRRRGGGGGHHH....so i guess my shit is not working huh?.... Please hook a brother up with the correct info!!
can't say this enough THANKS THANKS THANKS...
I got my 02 with 17t at 12.5%.... that was what i found most folks did with the 02... but now i wonder if they wired it correctly... Guess im gonna have to go out and get a GPS just to make sure....
posted September 18, 2002 07:14 PM
OK --- one more time! It DOESN'T make any difference where you splice into the yellow wire (vehicle speed sensor signal) on the 2000 model. On the 2000 model the signal goes ONLY to the speedometer - it DOES NOT go to the ECU. On the 2001-2002 models the yellow wire branches off and you have a parallel circuit - one leg going to the speedometer and one leg going to the ECU.
In theory (I say "in theory" because I don't have a 2001-2002 model to test/verify this info) here are the possible vehicle speed sensor "splice in" connection scenarios on the 2001-2002 models:
1) You splice into the yellow wire somewhere down near the vehicle speed sensor itself (prior to the circuit branching off into two different directions). You are connecting the Yellow Box in series with the output from vehicle speed sensor. Since you have connected it in series BEFORE the circuit branches off (going to the speedo and the ECU) you are sending the corrected signal from the Yellow Box to both the speedo and the ECU. If you are running "shorter gearing" on your 2001-2002 12R this is the way you want to connect the Yellow Box!! I'll explain exactly why you want to do this if someone requests the info, but since explanations of this sort can get rather "wordy" I'll hold off until necessary!!
2) You splice into the yellow wire somewhere AFTER the parallel branch split on the "branch" that sends the speed signal to the speedometer. OK, you've still connected the Yellow Box in series (if you made your connections correctly!), but you've only done it on the circuit that goes to the speedometer. The vehicle speed signal to the ECU has NOT been changed! You will be able to dial in whatever correction factor you want on the Yellow Box and the speedometer will show those changes when you ride the bike. All will seem OK - the Yellow Box will do it's job and correct your speedometer reading. But (and this is a BIG BUT!!!), since the ECU isn't getting a corrected signal from the vehicle speed sensor it (the ECU) will "see" a speed that is higher than that of your corrected speedometer - and once the ECU "sees" an uncorrected speed of 186 mph it will put an end to your fun!
Again --- I'll write more on that IF NECESSARY!!
3) You splice into the yellow wire somewhere AFTER the parallel branch split on the "branch" that sends the speed signal to the ECU. In this case you will correct the speed signal to the ECU (via the Yellow Box), but you aren't changing the signal to the speedometer at all. I haven't tried it, but this might be the best connection to make if you don't give a rat's ass about speedometer accuracy and want to do top speed runs with a fairly accurate speedo reading? [I don't know how accurately the 2001-2002 speedos read.] Let's just say this AIN'T the way to go if you're wanting your speedo to read accurately!!
That's all for now. Gotta go make some popcorn and read the 12R boards!!
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posted September 15, 2002 11:28 AM
posted September 15, 2002 12:42 PM
Edited By: 
