BobC
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posted August 14, 2009 05:35 AM
 Edited By: BobC on 14 Aug 2009 13:38
quote:
What is the speed restrictor nut, where is it and why do I want to fuck with it?
I don't know if anyone answered your question properly.
The tacho which counts countershaft revolutions sits over this nut. The corners of the nut generate the tach' pulse as they pass the head. This is what gives the ecu it's speed data. If you grind off a corner (or two) you fool the ecu which then calculates a slower speed. It messes up the speedo reading but effectively de-restricts the bike.
Cheap but effective. However, I prefer the Speedo Healer because it can not only de-restrict by electronically doing the same job as grinding a corner off the nut but it can be set back to transparent for road riding when you do want a speedo.
____________
Candy Thunder Blue 2006 ZZR1400
Stock wheelbase
Max: 205.4 mph in 1.25 miles
2012 ZZR1400 in Golden Blazed Green
Brock CT Full System. etc
Max: 203.1 in 1 mile (so far)
  
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derpie
Expert Class
Dont judge a book by its cover
Posts: 269
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posted August 14, 2009 05:56 AM
quote:
quote:
What is the speed restrictor nut, where is it and why do I want to fuck with it?
I don't know if anyone answered your question properly.
The tacho which counts countershaft revolutions sits over this nut. The corners of the nut generate the tach' pulse as they pass the head. This is what gives the ecu it's speed data. If you grind off a corner (or two) you fool the ecu which then calculates a slower speed. It messes up the speedo reading but effectively de-restricts the bike.
Cheap but effective. However, I prefer the Speedo Healer because it can not only de-restrict by electronically doing the same job as grinding a corner off the nut but it can be set back to transparent for road riding when you do want a speedo.
I like being able to go back and forth thanks for the info.
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freddie900
Expert Class
zx 14 2007
Posts: 152
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posted August 14, 2009 04:43 PM
quote:
quote:
quote:
What is the speed restrictor nut, where is it and why do I want to fuck with it?
I don't know if anyone answered your question properly.
The tacho which counts countershaft revolutions sits over this nut. The corners of the nut generate the tach' pulse as they pass the head. This is what gives the ecu it's speed data. If you grind off a corner (or two) you fool the ecu which then calculates a slower speed. It messes up the speedo reading but effectively de-restricts the bike.
Cheap but effective. However, I prefer the Speedo Healer because it can not only de-restrict by electronically doing the same job as grinding a corner off the nut but it can be set back to transparent for road riding when you do want a speedo.
I like being able to go back and forth thanks for the info.
GET A GPS!!!!! on mine i hit the mph on the touch screen and it tells me how fast i'm going just like the speedo and it keeps my max speed displayed on the same screen.garmin is the one i own $250.00 bucks or less at best buy or walmart.
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derpie
Expert Class
Dont judge a book by its cover
Posts: 269
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posted August 14, 2009 05:51 PM
quote:
quote:
quote:
quote:
What is the speed restrictor nut, where is it and why do I want to fuck with it?
I don't know if anyone answered your question properly.
The tacho which counts countershaft revolutions sits over this nut. The corners of the nut generate the tach' pulse as they pass the head. This is what gives the ecu it's speed data. If you grind off a corner (or two) you fool the ecu which then calculates a slower speed. It messes up the speedo reading but effectively de-restricts the bike.
Cheap but effective. However, I prefer the Speedo Healer because it can not only de-restrict by electronically doing the same job as grinding a corner off the nut but it can be set back to transparent for road riding when you do want a speedo.
I like being able to go back and forth thanks for the info.
GET A GPS!!!!! on mine i hit the mph on the touch screen and it tells me how fast i'm going just like the speedo and it keeps my max speed displayed on the same screen.garmin is the one i own $250.00 bucks or less at best buy or walmart.
I don't know if I'd want one that keeps my max speed on it , but I have a tom tom so i will try it out .
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eklipse636
Needs a life
ZX-14
Posts: 6046
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posted August 16, 2009 05:51 AM
I have a garmin. The max speed, all the average speeds, etc are pretty interesting!
____________
Best: 60ft 1.351 1/8 5.68 mph 123.98 1/4
8.89 mph 151.32
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Fastest-14
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Fastest -14
Posts: 354
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posted October 09, 2009 04:47 PM
The tacho which counts countershaft revolutions sits over this nut. The corners of the nut generate the tach' pulse as they pass the head. This is what gives the ecu it's speed data. If you grind off a corner (or two) you fool the ecu which then calculates a slower speed. It messes up the speedo reading but effectively de-restricts the bike.
Cheap but effective. However, I prefer the Speedo Healer because it can not only de-restrict by electronically doing the same job as grinding a corner off the nut but it can be set back to transparent for road riding when you do want a speedo.
Bob, what would be the difference in grinding off 1 corner vs 2 and if l was to grind off 2, would you grind the 2 corners side by side or catter corner? Wouldn't grinding off 2 corners be overkill?
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dubious
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posted October 09, 2009 09:17 PM
the tach is NOT read off the countershaft nut.
The tach reads off the crank sensor or "pulser" on the crank at the right side where the cam chain is driven from.
The speedo reads off the countershaft nut, and it is a speed sensor.
Eclipse.
The guys who run super low gearing like wee, are running very close to the speed limiter, as it is off by so much at 155~158 mph actual, if left uncorrected / bypassed by mechanical or electronic means, the bike ecu thinks its near 186, and they can actually bounce the speed limiter.
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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Fastest-14
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posted October 09, 2009 09:55 PM
[The guys who run super low gearing like wee, are running very close to the speed limiter, as it is off by so much at 155~158 mph actual, if left uncorrected / bypassed by mechanical or electronic means, the bike ecu thinks its near 186, and they can actually bounce the speed limiter.
1. What would be the difference in grinding off 1 corner vs 2?
2. If l was to grind off 2, would you grind the 2 corners side by side or catter corner and what's the difference?
3. If geared 16/43, with one corner ground off, would the bike still be able to go past 186 mph?
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dubious
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posted October 09, 2009 10:37 PM
Edited By: dubious on 10 Oct 2009 06:51
16/43 just grind one corner, your speedo will read about 6% lower than actual.
1 corner reduces speed reading by 25%, 2 by 50%, not sure if side by side, or opposite makes any difference... I doubt it would . Vibration Balance maybe?
here is a link for gearing info:
http://www.gearingcommander.com/
The zx14 tach is about 600 rpm optomistic, and the speedomoter 8% optimistic
So you know stock, a zx14 hits 174-175 mph at 9250 actual rpm on the speed limiter.
thats stock 17/41 gears. That is actual limited speed stock.
with the speed limiter removed, at 10,500 actual rpm = 198 actual mph derestricted on 10,500 RPM REV limiter ,
[ remember this is actual, not what the guages say- the tach will read about 11,000 at 186 indicated ]
16/41 @10,500 rpm limiter derestricted speed limiter = 187 actual mph
16/43@ 10,500 rpm limiter derirstricted speed limiter = 178 actual mph
198/ 178= 11% + 8% correction =19 % total.
25% (for the corner ground off) -19%( new gears and speedo calibration) = 6% difference, but reading low, rather than 8% high.
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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Fastest-14
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posted October 10, 2009 07:29 AM
quote:
16/43 just grind one corner, your speedo will read about 6% lower than actual.
1 corner reduces speed reading by 25%, 2 by 50%, not sure if side by side, or opposite makes any difference... I doubt it would . Vibration Balance maybe?
here is a link for gearing info:
http://www.gearingcommander.com/
The zx14 tach is about 600 rpm optomistic, and the speedomoter 8% optimistic
So you know stock, a zx14 hits 174-175 mph at 9250 actual rpm on the speed limiter.
thats stock 17/41 gears. That is actual limited speed stock.
with the speed limiter removed, at 10,500 actual rpm = 198 actual mph derestricted on 10,500 RPM REV limiter ,
[ remember this is actual, not what the guages say- the tach will read about 11,000 at 186 indicated ]
16/41 @10,500 rpm limiter derestricted speed limiter = 187 actual mph
16/43@ 10,500 rpm limiter derirstricted speed limiter = 178 actual mph
198/ 178= 11% + 8% correction =19 % total.
25% (for the corner ground off) -19%( new gears and speedo calibration) = 6% difference, but reading low, rather than 8% high.
Thanks Dubious but I'm still tryin to understand this. LOL. Still have a couple of questions based on what u said here.
1. Will the bike run any faster on top end with 2 corners grinded vs 1 corner, with the same gear ratio?
2. Let's say you are geared low, 16/43; is it still possible to get the bike to go faster than the 186 limiter and would it take, grinding off 1 or 2 corners to achieve that with that gear ratio.
3. Which do u think would make more sense theoretically if u was to grind off 2 corners, grind the corners side by side or catter corner and which would u prefer? There has to be a difference in the 2, I would think.
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dubious
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posted October 10, 2009 08:00 AM
1)with 16/43 and 1 corner ground off it will hit the rpm limiter, before the speed limiter
No need to grind more than 1 corner off.
2)16/43 , you are limited to 178 by RPM.
3) I haven't ground more than 1 corner off.
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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Fastest-14
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posted October 10, 2009 08:06 AM
quote:
1)with 16/43 and 1 corner ground off it will hit the rpm limiter, before the speed limiter
No need to grind more than 1 corner off.
2)16/43 , you are limited to 178 by RPM.
3) I haven't ground more than 1 corner off.
So what will my potential top speed be with these 2 gear ratios with one corner grind off:
17/41 and 17/43?
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dubious
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posted October 10, 2009 08:25 AM
Edited By: dubious on 10 Oct 2009 16:32
17/41= 198 theoretically, but most 14's won't pull more than 192 mph.... need more power, or better aero's. The guys who have ran over 200 have the bike lowered, morrors removed, and pipe etc at least, wind at their back, or down hill track etc...
17/43= 189, the better choice imo, more likely to use it, be able to pull it, and better for all other situations too. drag, cruise, and roll on. Especially if your a heavy guy, and average abilities drag racing.
I ran 16/41 derestricted with brocks pipe, and no flies, and would blow right past a stock zx14 easily on top end, and every other scenario too. Totally different league of performance.
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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dubious
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posted October 10, 2009 08:29 AM
quote:
16/43 just grind one corner, your speedo will read about 6% lower than actual.
1 corner reduces speed reading by 25%, 2 by 50%, not sure if side by side, or opposite makes any difference... I doubt it would . Vibration Balance maybe?
here is a link for gearing info:
http://www.gearingcommander.com/
The zx14 tach is about 600 rpm optomistic, and the speedomoter 8% optimistic
So you know stock, a zx14 hits 174-175 mph at 9250 actual rpm on the speed limiter.
thats stock 17/41 gears. That is actual limited speed stock.
with the speed limiter removed, at 10,500 actual rpm = 198 actual mph derestricted on 10,500 RPM REV limiter ,
[ remember this is actual, not what the guages say- the tach will read about 11,000 at 186 indicated ]
16/41 @10,500 rpm limiter derestricted speed limiter = 187 actual mph
16/43@ 10,500 rpm limiter derirstricted speed limiter = 178 actual mph
198/ 178= 11% + 8% correction =19 % total.
25% (for the corner ground off) -19%( new gears and speedo calibration) = 6% difference, but reading low, rather than 8% high.
get familiar with the gearing commander.
It is a very useful tool, and you can even see what your competitor is capable of with their model of bike and gears.
remember-
-stock speedo reads 8% higher than stock
-speed limiter restricts limits rpm to 9250 , and 10,500 is actual redline on the RPM limiter
the rest is just plugging in numbers 
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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Fastest-14
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posted October 10, 2009 09:08 AM
quote:
17/41= 198 theoretically, but most 14's won't pull more than 192 mph.... need more power, or better aero's. The guys who have ran over 200 have the bike lowered, morrors removed, and pipe etc at least, wind at their back, or down hill track etc...
17/43= 189, the better choice imo, more likely to use it, be able to pull it, and better for all other situations too. drag, cruise, and roll on. Especially if your a heavy guy, and average abilities drag racing.
I ran 16/41 derestricted with brocks pipe, and no flies, and would blow right past a stock zx14 easily on top end, and every other scenario too. Totally different league of performance.
Dubious, I have checked the Gear Commando out well before this thread came into existance. That chart has nothing to do with the corners being rounded off the nut. All the questions that I am asking you here is strictly in ref to the corners being rounded. My bike is lowered 11/4, brock Smeg, flies out, mirrors on.
You stated here that u ran 16/41 and u would blow right past a stock zx14 easily on top end. I was wondering how is that possible with you being geared much lower?
How is your bike derestricted, nut rounded or Speed Healer?
Based on what u said here, how is it that Shane661 is able to run almost 212 mph on a stock motor with jus MR9 and I believe a 17/42 or 17/40 gear?
You say that the rev can hit sometimes before the speedo. How would a 18/41 or 18/43 yield on top end or would it be too much gear?
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dubious
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posted October 10, 2009 09:48 AM
Oh, so your one of them guys!
If you already know it all then why the questions?
If you haven't got it by now you might not ever, but i"ll try one last time...
It has EVERYTHING to do with griding a corner off. That allows the engien to pull an extra 1250 (or more ) rpm in 6th.
What was shane's exact gearing? what actual RPM did he acheive? what was his tire diameter?
what aerodymanics did he have? what wheel bearings does he run? what was his oil viscosity? what other mods does he have?
These all do make a difference.
These bikes have a soft limiter, and with brocks pipe i have seen mine pull an extra 300 rpm in ANY gear than stock unrestricted, due to the additional 30 HP it makes at redline, in effect reducing and overrunning the soft RPM limiter.
Shane's bike is as far from stock as it can be, except engine internals or power adders.
How much wind did he have at his back.
Brock was unable to surpass 201 MPH, for a similar set up, so the wind direction was helping that day.
These numbers I have provide have all been pessimistic.
I have actually seen 11.300 RPM on my tach meaning it was pulling 10,800 in 6th, which is considerably better than 10,500
Its simple math,
16/41 with and 10,500 rpm is faster than 17/41 at 9250 rpm... and its as simple as that.
I have got better things to do than internet disputes, so with that said, figure the rest out yourself and have a nice day!
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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Fastest-14
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posted October 10, 2009 09:59 AM
You know what Dubious, You aint got to be such a Smart ASSHOLE. I was just asking questions trying to see how this thing work. Nobody held a gun to your head to make you respond to anything. Sorry but everybody can't be a rocket scientist like you are. You try to act like you want to do the thread some good by giving good info, then the minute someone asks you valid questions to get you to support what you are saying, you get all offended and start acting sarcastic. This has nuthin to do with any damn internet dispute. Where is the dispute??? Jus trying to get consistent info, that is all.
Maybe you need to go figure the rest out yourself and have yourself a nice day!
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dubious
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posted October 10, 2009 10:16 AM
LMAO 
Dood, those did not come across as valid questions IMO, when the proof was already provided.
You came across as disputing what i said when i am trying to help you....
My numbers might be off by 0-5 mph, on the pessimistic side.
I don't think i am smarter than anyone else either BTW.
There is waaaay too much bad info rolling around out there.
whatever, don't go away mad, nobody on the internet is worth the frustration.... for me or for anyone else, yourself included.
meaning we should never take the internet personally.... I choose to end it before it gets there for me.
LOL , I was sincere when i wished you a good day...
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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Fastest-14
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posted October 10, 2009 10:34 AM
quote:
LMAO
Dood, those did not come across as valid questions IMO, when the proof was already provided.
You came across as disputing what i said when i am trying to help you....
My numbers might be off by 0-5 mph, on the pessimistic side.
I don't think i am smarter than anyone else either BTW.
There is waaaay too much bad info rolling around out there.
whatever, don't go away mad, nobody on the internet is worth the frustration.... for me or for anyone else, yourself included.
meaning we should never take the internet personally.... I choose to end it before it gets there for me.
LOL , I was sincere when i wished you a good day...
The questions I was asking are valid to me. I felt like you were giving me good info, so I wanted to know more. I asked you about possible top end with one corner rounded with18/41 and 18/43, that u never answered. LOL! I have never heard of this rounding off a corner on the counter sprocket nut till yesterday. I thought that was an awesome, cheap and different option that many of us can take if we wanted. I was just trying to get as close to consistent answers as l could, regarding what one other member did on top end mph and what you were saying here. Nobody is judging you here. We all know that there is room for error. No 2 ZX-14's are built exactly alike, so there is room for variences. You just came across as being sarcastic. There was definitely nuthing to get mad about here for you, me or anybody else. It was all a discussion about bikes.
It's all good!!!
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MADNINJASKILLS
Novice Class
Posts: 37
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posted October 10, 2009 11:34 AM
im thinking of grinding a corner of the nut to get my speedo- odometer more accurate. I now run 16-43 and thinking of going to 16-45. This is just a street bike for me and doesnt see the track.Can anyone provide a pic or more info on how much needs to be removed from the nut? a pic would be great.
Thanks guys for all the info.
Big Dave
____________
2008 Atomic silver ZX14
2004 GSXR 1000
1998 Honda Valkyrie
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dubious
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posted October 10, 2009 12:30 PM
Edited By: dubious on 10 Oct 2009 20:31
16-45 coincidentaly is a good combination for this mod and serious 1/4 mile use.
The bike has massive mechanical advantage, and the speedo is almost dead accurate,.... from the calculations on the gearing commander.
I am wondering if the guys using gearing this low have tried 2nd gear launches. My perspective is the shift would almost be required simultaneous with clutch fully engauged out of the hole.
Wee might have some insight to share...?
18-41 is probably just a little too much gear without internal work or power adder unless the wind is in your favour, from what i have read. 18-43 would be very similer to 17-40 gearing, and what I believe Brock used to acheive 201 mph if i recall correctly.
Guys running turbo seem to like the 18-41 gear, it allows the engine to pull rather than rip right through the revs, better fuel mileage when cruising keeping it out of the revs, and boost is the best when its coming on under load, which taller gearing will give. 
Plus they can pull all of it !
Pats pic:
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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MADNINJASKILLS
Novice Class
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posted October 10, 2009 04:35 PM
Thanks Dubious! Do you think it's doable with the nut still in place? Im thinking of just taping up around it to keep the filings out of the chain, and hitting it with a wiz wheel. As far as the 16- 45 goes im about 295 with gear on and can use as much mechanical leverage as i can get. By the way, the bike is stretched about 6 inches and im running a shinko 003. im in it for the light to light acceleration and not top end runs. thanks again.
Big Dave
____________
2008 Atomic silver ZX14
2004 GSXR 1000
1998 Honda Valkyrie
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eklipse636
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ZX-14
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posted October 10, 2009 05:04 PM
I'm running the 16/48 and first gear is quick, but not quick enough to even think about a 2nd gear launch. It takes quite a bit of rpms to do a burnout in first, but I do it. Watch my video and you can see where I change into 2nd.
____________
Best: 60ft 1.351 1/8 5.68 mph 123.98 1/4
8.89 mph 151.32
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dubious
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posted October 10, 2009 06:02 PM
Cool !
It could be ground off on the bike probably, make sure the wheel is spinning towards the ground to prevent arc on the paint maybe
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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joemugg
Expert Class
Posts: 109
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posted October 10, 2009 07:06 PM
Dubious, I have a question about the RPM limiter. I have a speedohealer correcting error and then dropping to KMH. Is the rpm limiter dedicated to 6th gear, meaning 6th is ALWAYS restricted to 9250? And does that mean top speeds runs are done in 5th IF a corner has not been ground off the nut?
____________
'06 ZX14 blue, Muzzy M14/M10, flies out, BMC filter, PCIII, SpeedoHealer, Scott's Steering Damper, 16 tooth Vortex
'97 GSXR600 street sweeper
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