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BIKELAND > FORUMS > ZX-14.com > Thread: Real world gearing for 200mph NEW TOPIC NEW POLL POST REPLY
GREYHOUNDMOSES


Expert Class
Posts: 324
posted April 03, 2012 01:01 AM        
Real world gearing for 200mph

I've read sevearal times that the stock gearing falls short of 200mph in the real world and most run
17/40 to achieve it.
I plan on having one attempt later this season (a1.4 mile event) and am hoping my current gearing is right.
I'm currently running 16/38 at SWB and want to know if this is enough in the real world.
GC gives the following "theoretical" speeds at 10750rpm.

17/41 203.4
17/40 208.5
16/38 206.5

Anybody know?

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Shane661


Needs a life
Posts: 11494
posted April 03, 2012 03:18 AM        
You need a little less sprocket...figure 3% slip at those speeds. Measure tire height/circumference to be sure...

Shane

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Rich


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Just havin' fun!!
Posts: 300
posted April 03, 2012 12:06 PM        
Mine ran 197 with me and 199 with Ali last May at Maxton on 17/ 40. This was with a 180 x 55 back tire. I'll know more after the Wilmington meet the end of April.
____________
07 Green and Black, How fast is fast?
203 for now. Limited $$ = limited HP.

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GREYHOUNDMOSES


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Posts: 324
posted April 04, 2012 04:31 AM        
Thanks Shane.
I take it (at 3% slippage) 17/40 is enough but 16/38 is bang on the money and MAYBE enough
but MAYBE not!
I don't know if I'll hit 200mph but, as I only intend going to one meet, I'd hate to run out of gear!
Rich. I take it at Maxton you ran out of track rather than gear? Or did Ali being lighter, experience less slippage to make the 2mph difference?

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samin


Novice Class
Posts: 94
posted April 04, 2012 05:16 AM        Edited By: samin on 4 Apr 2012 19:24
You can also check this: http://www.sslipp.com/lsc.html made by Slip from finnish kawi forums (so you need to convert units from metric to US).

It calculates (roughly) theoretical top speed with certain parameters, including tire slip.
____________
*Who's General Failure and why's he reading my disk?
* ZX-14 ABS -08, Finnish guy ^^

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RICH CRAFT 1


Zone Head
Posts: 681
posted April 04, 2012 06:34 AM        
a 17/41 is a 385 final drive @ 11000 RPMs gives you about 207 and with a 3% slippage gives you about 201 @ 11,000. you can put ZX 12 front sprocke which is a18, final drive = 3.63 @11000 = 219 with 3% slippage = 216 mph..be careful about how tall you go on the gear racial it will hurt your ability to reach your target mile-per-hour. I'm sure there are some on here that can answer your question, I think Brock went 200 on the 06 14 with stock Gearing? of course you have to have the limiter removed, you can do that by grinding one of the four corners off the sprocket nut. not own 2012 models.

Ken
____________
Red 06 ZX14 RR

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Shane661


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Posts: 11494
posted April 04, 2012 07:05 AM        Edited By: Shane661 on 4 Apr 2012 21:09
Brock's bike had 17/40 on it. As I say, don't forget to measure your tire. Different tires can be equal to 1 tooth of gear in some cases.

http://www.brocksperformance.com/brocknm/templates/bpp1.aspx?articleid=122&zoneid=11

Shane

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Rich


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Just havin' fun!!
Posts: 300
posted April 04, 2012 12:57 PM        
"Rich. I take it at Maxton you ran out of track rather than gear? Or did Ali being lighter, experience less slippage to make the 2mph difference?"

Ali has been doing this a lot longer than I have. WAY more trips down the mile. I've got him by about 20 pounds, but experience made the 2 mph difference.

Having an extra sprocket on hand would be a good thing, maybe start off with 17 x 40 and have the option of changing out to a 39 if your on the limiter.
____________
07 Green and Black, How fast is fast?
203 for now. Limited $$ = limited HP.

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oldkawboy


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Posts: 2125
posted April 04, 2012 02:53 PM        
quote:
Brock's bike had 17/40 on it. As I say, don't forget to measure your tire. Different tires can be equal to 1 tooth of gear in some cases.

http://www.brocksperformance.com/brocknm/templates/bpp1.aspx?articleid=122&zoneid=11

Shane


That kid on Brocks bike looks familar.

Dan

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GREYHOUNDMOSES


Expert Class
Posts: 324
posted April 05, 2012 12:13 AM        
quote:


That kid on Brocks bike looks familar.

Dan



Good news Dan. Your Alzheimer's results are negative!

I've read Brocks report a couple of times in the past for entertainment, but now I'm looking to go, there's good info in there!

Thanks for all the input. I would have liked to keep the 16/38 I run at the track but it looks like it might fall short.
When the time comes I'll run 17/40 and with a new tyre (probably a power one) that should be enough.

Only one way to find out for sure!

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RICH CRAFT 1


Zone Head
Posts: 681
posted April 05, 2012 02:58 AM        
okay I stand corrected on the Brock gearing.

Here's what a 17/40 would look like

40 divided by 17 = 2.353 X 1.541 = 3.625 X 1.036 overdrive = 3.756 final drive

a 3.756 final drive with a 76.5 rollout on the tire gives you a mechanical speed of 211.68 @ 11000 rpm

Obviously you can't run it into the RPM limiter, there is no tire growth figured in this, there is no tire slippage, tire slippage really depends on the surface you're running on.

Ken
____________
Red 06 ZX14 RR

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oldkawboy


Needs a job
Posts: 2125
posted April 05, 2012 03:17 AM        
Hey GHM,

There is many variables as far as slippage, tire size, etc. so for what it's worth at Loring I ran 201.xx with 17/40 and wasn't at the limiter.
At Maxton I ran 198 and Zack ran 199.xx with stock gearing.......he said he was getting real close to tagging the limiter.

I'd rather gear a tad too tall than too short for the first pass just in case. Bumping the limiter at the traps is FRUSTRATING!!!

What mods have you done?

BTW: Thanks for the test results! ;-)

Dan

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BobC


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Posts: 1736
posted April 05, 2012 06:29 PM        Edited By: BobC on 6 Apr 2012 08:56
Guys, I used 17/40 on my 2006 ZX14 and got speed trapped at 203.1mph. This gearing suits the power of the bike best in my opinion. It's also good enough to dip into the nines through the quarter. Brock got it dead right.

At an earlier meeting in September 2006 I went faster on 18/41 at 205.4mph - but that was with a tail wind and really down to luck because it was a bit overgeared for the 192 rwhp.

I don't mean to hi-jack the topic but I've been looking at the gearing tables for the 2012 bike, just got mine. The tables give 197.5mph on stock 17/42 gearing (ignoring slippage) and with the extra 500rpm from a re-flash it gives 206.6mph.

This is my question: Does re-flashing the ecu to remove the speed-limiter affect the immobiliser our European bikes are fitted with in any way? The ignition key and the ECU have to be paired or it won't run. Are the USA bikes the same in this respect? Thanks for any answers.

____________
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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blue07


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Posts: 485
posted April 06, 2012 11:03 AM        Edited By: blue07 on 7 Apr 2012 01:24
Today I ran two top end runs....on my open stretch up here.Temps were around 40 degrees.Road surface...perfect.NORMALLY...my 07 would have hit the meat of the redline rpms,then she'd be topped at 190...was my best on her.Speedohealed and GPS'd.

My 2012....she's off speedo wise by 2 mph...checked with radar...60 indicated is actually 58.

Having said that...I had my ECU flashed by Guhl.Top end restrictor disabled.RPM limiter...raised by 200.

Metzler 190,50.3100 V Motul Motor oil 10/40.1200 miles approx on my bike.

I took off rolling...opened er up.She climbed to 10,950 or therabouts...did not enter redline at all(The speedo was reading...well...it was all the way past the area of markings.Into the empty dial area.I had to back out...that curve was coming up REALLY QUICK.IDK how fast she was going...but apparently...she's still got some 700 or a bit more RPMS to go before she limits?Let me say...the limiter IS working...it kicks in at 11 something...POSSIBLY 12.I've hit it a couple of times upshifting...IF that speedo is marked with accuracy...the increments passing 180 being representative of real speed and the distance between markings...I would have to say...she was right there at damn near 200.Had to be.I need to run this again...and start my roll-on a lot quicker next time.Stock gearing...Power...F...Krtc...1.It's on video...youtube.I think she'll do 200 with everything stock....(and delimited of course).

Just looked again at what was going on there....I ended the run before redline...both times.I need to open er up sooner...that's all.I'd say a lot sooner.The motor wasn't even near topping out.=)

Both runs were almost identical in chopping of the throttle....so I can't tell IF the gearing is holding her back...or getting ready to.Could be.She had plenty of rpms left though...so...IDK.

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